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  • Review
  • Open Access

The roles of miRNAs in human breast cancer and canine mammary tumor

Applied Cancer Research201737:37

  • Received: 12 June 2017
  • Accepted: 29 August 2017
  • Published:


MicroRNAs have become a hot topic in cancer research nowadays due to their important role not only on cancer development, progression, invasion but also on repression of cancer related genes. With advanced technologies, these microRNAs can easily be detected from biopsy samples and blood for early diagnosis, prognosis and treatment. Due to increasing demand of research in exploring expression profile of microRNAs with respect to different subtypes of breast cancer, this review aimed to provide an update on microRNA database available resources, canine breast cancer models, the role of microRNA as oncomir or oncosupressor, detection of microRNAs and potential of miRNAs for breast cancer treatment.


  • Breast cancer
  • MicroRNAs
  • Oncomir
  • Oncosupressor
  • Targets of miRNA
  • Breast cancer model
  • miRNA profiles
  • miRNA database


MicroRNA (miRNA) was discovered in 1993 in Caenorhabditis elegans [1]. These non-coding short RNAs known as miRNAs from eukaryotes such as in plants and animals are highly important for regulation of gene expression at post-transcriptional level. Further, miRNAs are also responsible for cellular growth, differentiation, proliferation and apoptosis [2]. Predominant expression of a particular miRNA varies according to the type of animal tissue. Changes of normal miRNA expression levels indicate abnormal or disease conditions of tissues or body systems. Researchers were convinced to focus more about miRNAs after they found the first miRNA lin-4 of C. elegans that inhibited the expression of lin-14 gene [1]. Since then researchers introduced more and more worthy new findings related to several miRNAs and their roles in different diseases and cancers including breast cancers that potentially led clinicians to be able use circulating miRNAs as affordable, non-invasive detectable biomarkers for earlier diagnosis, prognosis and treatments of breast cancers.

Processing of microRNAs in the body

MicroRNAs (miRNAs, miRs) are 20 to 23 nucleotide RNAs and modulate gene expressions [3]. MicroRNAs processing in our body can be observed two parts as they started working in the nucleus of cells and continue its further processing in the cytoplasm [4]. The process in the nucleus initiates with the transcription of non-coding miRNAs genes with their own promoters. These primary transcriptions are carried out mainly by RNA polymerase II and the products are known as pri-miRNAs [5]. The stem-loop structure of pri-miRNAs are further processed by enzyme Drosha and dsRNA-binding protein DGCR8 [68]. The cleavage of pri-miRNAs produces 70 nucleotide long pre-miRNAs [9]. These pre-miRNAs are then exported into the cytoplasm by exportin 5 for further processing [10]. In the cytoplasm, pre-miRNAs are cleaved by RNase III enzyme, Dicer 1 that works together with transactivation responsive RNA binding protein 2 (TRBP) and AGO2 to generate double stranded miRNA-miRNA* duplex [1113]. From the two miRNA strands, the guide strands or mature miRNA strands are incorporated into RISC (RNA-induced silencing complex) in order to bind its complementary target mRNA sequences of the target genes to block translation process. The passenger strands miRNA* are degraded [14, 15]. However, it was also reported that some miRNAs; e.g. miRNA 145 are processed without Dicer, alternative precursors of miRNAs called mirtrons are processed without Drosha. Some miRNAs are processed along the pathway of tRNA [1619]. Up to now, scientists have found miRNAs 2619 in human [20].

The process of miRNA begins in the nucleus of cells and continue in the cytoplasm of cells. Primary miRNA (pri-miRNA) transcription is done mainly by RNA polymerase II. Drosha and DGCR8 trim 100 nt to 120 nt long pri-miRNA to become a shorter 70 nt pre-miRNA and it is exported into cytoplasm by exportin 5 for further processes. Pre-miRNA in the cytoplasm is cleaved by RNase III, Dicer I and Argonaute 2 (AGO2) to become a 20 nt to 30 nt long duplex miRNA consists of a guide strand and a passenger strand. From the duplex miRNA, the strand, 3′ to 5′ miRNA known as passenger miRNA is degraded due to PIWI domain in RISC. The guide strand 5′ to 3′ miRNA which is engaged with PAZ domain in RISC binds to its target mRNAs and causes translational repression and cleavage of target mRNAs (Fig. 1).
Fig. 1
Fig. 1

MicroRNA Processing Steps Pathways. The process begins in the nucleus of cells and continue in the cytoplasm of cells. Primary miRNA (pri-miRNA) transcription is done mainly by RNA polymerase II. Drosha and DGCR8 trim 100 nt to 120 nt long pri-miRNA to become a shorter 70 nt pre-miRNA and it is exported into cytoplasm by exportin 5 for further processes. Pre-miRNA in the cytoplasm is cleaved by RNase III, Dicer I and Argonaute 2 (AGO2) to become a 20 nt to 30 nt long duplex miRNA consists of a guide strand and a passenger strand. From the duplex miRNA, the strand, 3′ to 5′ miRNA known as passenger miRNA is degraded due to PIWI domain in RISC. The guide strand 5′ to 3′ miRNA which is engaged with PAZ domain in RISC binds to its target mRNAs and causes translational repression and cleavage of target mRNAs

Mechanisms of miRNA action

Single stranded mature microRNAs bind 3′ UTR (untranslated region) of target mRNAs as a post transcriptional regulation of gene expressions that inhibits translation of target mRNAs for proteins or cleavage of the target mRNAs by Argonaut ribonuclease of RISC (RNA-induced silencing complex) [21]. MicroRNA does not need to bind its whole length of complete nucleotide sequences to target mRNA but miRNA can perform gene expression regulation as long as minimum 2 to 8 base pairs are perfectly complementary between 3′ region of target mRNA and 5′ region of miRNA (miRNA seed sequence) in human and animals [22]. In human and animals, seed region of miRNA is usually 100% complementary to target mRNA but the rest sequences of miRNA may include mismatches to target mRNA that causes distended appearance due to limited base paring [23]. Two silencing mechanisms; slicer dependent that shows targeted mRNA cleavage irreversibly by Ago2 and slicer independent way that causes reversible translation repressions [24].

One miRNA can regulate concurrently the expression of many genes and thus it is involved in multiple cellular signaling pathway [3]. Furthermore, in recent studies, miRNAs was found to be involved in increasing the translation of a target mRNA directly and they were also be able to indirectly increase target mRNA levels by interacting repressor proteins which deter the translation of target mRNA [25]. MicroRNAs (miRNAs), either be as oncogenes or tumor suppressor genes play crucial role in cell differentiation, development, apoptosis and cell cycle. MicroRNAs are known to be expressed differentially in cancers but they show unique expression signature for a specific tumor type. It was reported that miRNAs influence on metastasis and resistance to different types of therapies [26]. Furthermore, researchers have found pro and anti-metastatic miRNA [27].

MicroRNAs for diagnosis, prognosis and therapeutics

Detecting circulating miRNA has also become a promising diagnostic tool. MicroRNA profiles are useful not only for diagnosis and prognosis but also for treatments in terms of choosing effective chemotherapeutic drug in cancers. This is why nowadays detecting miRNA profiles from breast cancer become more and more common in research field and also this happens to clinicians. In a study with zebra fish, researcher found that certain miRNAs dominantly expressed in specific tissues and they became noticeably reduced expression levels when the tissues are in tumors state [28]. Commonly used breast cancers diagnostic methods such as mammography, ultrasound, X-rays and MRI still exist limitations of its use in patients and also required skills to read the images for proper interpretations. Although detecting circulating miRNA is not a substitute for other conventional diagnostic methods, it simply becomes essential for most cancer diseases due to its less invasive than tissue biopsy which has to be done for genetic tests such as specific mRNA expression. It has been reported several miRNAs have been proved to be deregulated. Up-regulated miRNAs that may be used for diagnosis, prognosis and therapeutic are miR21, miR155, miR221/222, miR9, miR10b, miR29a, miR96, miR146a, miR181, miR373, miR375, miR520c and miR589 [29, 30]. Some of these up-regulated miRNAs in tumors play major role in controlling and working together with multiple targets genes and led them to be invasive types. Down-regulated miRNAs are those with tumor suppressor properties. Recent study reported that let7c is possible biomarker which can discriminate breast cancer samples grade 1 to grade 3 [3]. Other consistently down-regulated miRNAs are miR30a, miR31, miR34, miR92a, miR93, miR125, miR126, miR146a, miR195, miR200, miR205, miR206, miR503 and let7 family.

In breast cancer stem cells, miR15/16, miR103/107, miR128b, miR145, miR200 and miR335 are found to be down-regulated. With great efforts, now total 130 over miRNAs signatures were identified to distinguish between normal and tumor breast tissue accurately [31]. MicroRNAs in breast cancers can be classified into Oncomirs, Oncosupressors and MetastamiRs [32]. Oncomirs disturb expression of oncosupressors and cells apoptosis. In human breast cancer, oncomirs miRNA21 and miRNA155 are outstandingly upregulated and oncosupressors miRNA10b, miRNA125b and miRNA145 are noticeably downregulated. In triple negative breast cancers, miRNA21, miRNA 210 and miRNA 221 were found to be upregulated. Anti-miRNAs to those upregulated oncomirs not only inhibited cancer cells growth but also increased apoptosis and decreased cell proliferation. Oncosupressors such as miR204, miR34a,b,c and let-7 family of microRNAs are found to be down-regulated in breast cancers. In one study, let-7 mimics showed effectiveness in the treatment of lungs cancer in mouse model when it was administered I.V. in the form of neutral lipid emulsion. MetastamiRs are recently recognized and introduced to those small non-coding miRNAs that regulates migration and invasion of cancer cells [33, 34]. These metastamiRs plays as major role in epithelial-mesenchymal transition (EMT), apoptosis and angiogenesis. It was reported that miRNAs 10b expression is 50% higher in invasive type of cancer cell line MDA-MB-231 compare to non-invasive type MCF-7 cancer cell line. Although miRNA10b was found to be down-regulated in non-invasive breast cancers, its change to up-regulation indicates the initiation of breast cancer metastasis. A study shown that applying antisense miR10b inhibitor oligonucleotides reduces invasiveness of transfected cells. It is required to restore the level of miRNAs to normal state and this can be achieved by dosing miRNA mimics or inhibitors, introducing miRNA genes with a DNA vector, application of small molecules to reverse epigenetic silencing of miRNAs [28]. MicroRNAs mimics are short double stranded RNA guide strand and passenger stand oligonucleotides. They may be fully or partially complementary each other. The list of down-regulated miRNAs has been published and each of them are indeed potential cancer therapeutic miRNAs. It was also known that one therapeutic miRNA is able to target multiple mRNAs. In vivo study further provided an evidence that silencing of overexpression miR10b with systemic antagomirs suppressed breast cancer metastasis in mice [35]. Another study reported that miR373 was up-regulated in patients with breast cancer metastasized to lymph nodes. Like other circulating miRNAs, metastamiRs also become a popular molecular marker for breast cancers. Circulating miRNAs biomarkers offered affordable and non-invasive method of early detection, differentiating subtypes of breast cancers which allows clinicians to predict prognosis and further adjust their treatment regime as required. Table 1 miRNAs expression level, their targets, functional roles and potentials as biomarker in human breast cancer (female).
Table 1

miRNAs expression level, their targets, functional roles and potentials as biomarker in human breast cancer (female)

miRNA Human (Female)

Sample Source

Expression Level


Functional Role, Biomarker as Diagnostic, Prognostic, Therapeutic

Authors, year of publication

Let 7 family

Cell line, Tissue, Blood, Serum



Proliferation, differentiation, self-renewal, EMT, Tamoxifen response, diagnostic and prognostic biomarker

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3]

Schooneveld et al. 2015 [36], Kaboli et al. 2015 [58], Takahashi et al. 2015 [59], Zhang et al. 2014 [60], Schwarzenbacher et al. 2013 [61], Fu et al. 2011 [62], O′ Day et al. 2010 [2]





Regulating gene expression, cell growth and survival control, Tamoxifen response, Docetaxel and Cisplatin sensitive, diagnostic biomarker

Bertoli et al., 2015 [3], Kaboli et al. 2015 [58]


ER+ tissue, Cell line



Regulate CDKs and control cell cycle progression G1 to S, cellular adhesion and metastasis, diagnostic and prognostic biomarker

Bertoli et al., 2015 [3], Kaboli et al. 2015 [58],

Schooneveld et al. 2015 [36], Zhang et al. 2014 [60]


Cell line, Tissue



Promote cell migration, invasion, metastasis, EMT, stemness of BCSC,

Tamoxifen resistance, diagnostic biomarker

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36]

Kaboli et al. 2015 [58], Takahashi et al. 2015 [59],

Shafi et al. 2014 [32], Zhang et al. 2014 [60], Fu et al. 2011 [62], O′ Day et al. 2010 [2]


Plasma, Tissue, Cell line, Serum



Regulate cell proliferation and death, diagnostic and prognostic, Doxorubicin and Docetaxel response

Bertoli et al. 2015 [3], Kaboli et al. 2015 [58],

Zhang et al. 2014 [60], Schwarzenbacher et al. 2013 [61],





Regulate CDKs and control cell cycle progression G1 to S, cancer cell proliferation, diagnostic biomarker

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3],

Fu et al. 2011 [62], O′ Day et al. 2010 [2]


Cell line



Control cell cycle, proliferation, tumorigenesis, proapoptosis, metastasis

Kaboli et al. 2015 [58], Schooneveld et al. 2015 [36], Xiang et al. 2010 [63], Bonauer et al. 2009 [64]


Plasma/Tissue/Cell line, Serum, Blood



Promote cell migration, invasion, metastasis, EMT, diagnostic and prognostic biomarkers, resistant to Cisplatin, Doxorubicin, Topotecan

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3],

Schoonevel et al. 2015 [36], Kodahl et al.2014 [65], Shafi et al. 2014 [32], Zhang et al. 2014 [60]


Cell line


CDK6. SIRT1, SP1, TET1–3, TIP60

Regulator of cellular senescence, inhibit tumor growth and metastasis, regulate EMT genes by repressing TIP60, prognostic biomarker (TIP60/miR-22)

Kaboli et al. 2015 [58], Takahashi et al. 2015 [59], Schwarzenbacher et al. 2013 [61]





Cell cycle progression G2 to M check point regulation, tumor development, invasion and metastasis, diagnostic and prognostic biomarker

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3], Zhang et al. 2014 [60], Tang et al. 2012 [66], Fu et al. 2011 [62], Mertens-Talcott et al. 2007 [67]


TNBC, Cell line and tissue



Regulate cell cycle progression, proliferation, metastasis, angiogenesis, drug resistance, generation of breast cancer stem cells (BCSCs), prognostic biomarker

Ding et al. 2017 [68], Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3], Zhang et al. 2014 [60], Schoonevel et al. 2015 [36], Fu et al. 2011 [62]





Inhibit proliferation, angiogenesis and metastasis. Diagnostic biomarker

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3]


TNBC, Cell line and BCSCs



Regulate self-renewal and antiapoptotic, in-vitro mammosphere formation.

Bertoli et al. 2015 [3], Kaboli et al. 2015 [58]

Schwarzenbacher et al. 2013 [61]




TWF1, IL-11, VIM

Tamoxifen response, suppresses interleukin 11 expression and inhibit resistance to paclitaxel and doxorubicin

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3],

Takahashi et al. 2015 [59]


BC and TNBC cell line



Inhibits several steps of the invasion-metastasis cascade in breast cancer

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3],

Kaboli et al. 2015 [58], Schooneveld et al. 2015 [36],

Zhang et al. 2014 [60], Fu et al. 2011 [62], O′ Day et al. 2010 [2]

34a, b, c

BC and TNBC cell line,





Cell Cycle control, invasion and metastasis, EMT, self-renewal and EMT, diagnostic biomarker, radiotherapy sensitive

Bertoli et al. 2015 [3], Zhang et al. 2014 [60],

Schwarzenbacher et al. 2013 [61]

Kaboli et al. 2015 [58], Fu et al. 2011 [62]

O′ Day et al. 2010 [2]


Cell line, Tissue



Inhibit cell proliferation and differentiation, induce apoptosis, Docetaxel sensitive, diagnostic biomarker

Hsieh et al. 2015 [69], Bertoli et al. 2015 [3], Kaboli et al. 2015 [58], Zhang et al. 2014 [60]


Cell line, Tissue



Inhibit cell proliferation and differentiation, diagnostic biomarker, FEC chemotherapy resistant, Taxol resistant, Trastuzumab sensitive.

Kurozumi et al. 2016 [57], Bertoli et al., 2015 [3],

Schooneveld et al. 2015 [36], Zhang et al. 2014 [60], Feliciano et al. 2013 [70], Wang et al. 2012 [71]


BC and TNBC cell line, Tissue



Cell cycle progression from G1/G0 to S, reduces metastasis and angiogenesis, diagnostic biomarker

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3],

Zhang et al.2014 [60], Fu et al. 2011 [62]


Cell line and BCSCs



Regulate cell cycle, inhibit tumor growth and angiogenesis, Doxorubicin sensitive

Bertoli et al. 2015 [3], Kaboli et al. 2015 [58],

Schwarzenbacher et al. 2013 [61]





Inhibit cell invasion and metastasis, diagnostic biomarker

Schooneveld et al. 2015 [36], Kaboli et al. 2015 [58], Kodahl et al. 2014 [65]


Serum/Plasma/Tissue, Cell line



Inhibit cell invasion and metastasis, diagnostic biomarker

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36], Zhang et al. 2014 [60], Kodahl et al. 2014 [65]

Fu et al. 2011 [62]


BC and TNBC cell line, Tissue



Proliferation, antiapoptotic, diagnostic biomarker

Bertoli et al. 2015 [3], Shafi et al. 2014 [32]


BC and TNBC cell line, Tissue



Antimetastasis, symmetric and asymmetric division of CSCs

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3], Kaboli et al. 2015 [58]


BC and TNBC cell line, Tissue




Kurozumi et al. 2016 [57], Schooneveld et al. 2015 [36], Kaboli et al. 2015 [58]


Serum, Heterogenous BC, Tissue



Cell growth, proliferation, metastasis, telomere synthesis, TGF- β Signaling, diagnostic and prognostic biomarker, Taxane response

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36],

Kodahl et al.2014 [65], Zhang et al. 2014 [60], Kaboli et al. 2015 [58], Fu et al. 2011 [62], O′ Day et al. 2010 [2]


Cell line and BCSCs, Serum



Regulate in vitro mammosphere formation, anti-apoptotic

Bertoli et al. 2015 [3], Schwarzenbacher et al. 2013 [61], Kaboli et al. 2015 [58]


Tissue, Blood, Cell line



Promotes cell proliferation, migration and metastasis, associated with the resistance to Doxorubicin, diagnostic biomarker

Zheng et al. 2015 [72], Kaboli et al. 2015 [58]


Cell line and tissue



Proliferation, antiapoptotic, Tamoxifen response

Kurozumi et al. 2016 [57], Bertoli et al. 2015 [3]

Kaboli et al. 2015 [58], Zhang et al. 2014 [60]





Antimetastastic, inhibit cell migration, enhance chemosensitivity, associate with trastuzumab (Herceptin) response, diagnostic biomarker.

Bertoli et al., 2015 [3], Kaboli et al. 2015 [58], Calura et al. 2014 [73], Le et al. 2012 [74]


Tissue, Cell line



Regulate proliferation, invasion and metastasis, prognostic biomarker

Fang et al. 2016 & 2013 [75, 76]


Tissue and Cell line



Reduces tumor growth, anti-metastatic, stemness and EMT.

Bertoli et al. 2015 [3], Kaboli et al. 2015 [58],

Shafi et al. 2014 [32], Hilmarsdottir et al. 2014 [77], Schwarzenbacher et al. 2013 [61], O′ Day et al. 2010 [2]


Tissue and Cell line



Reduces tumor growth, anti-metastatic

Tsouko et al. 2015 [78], Bertoli et al. 2015 [3], Kaboli et al. 2015 [58]


Tissue and Cell line


SP1, RAB21, RAB23, RAB18, RAB3B

Control cell proliferation and apoptosis, Prognostic biomarker

Yao et al. 2015 [79], Ye et al. 2014 [80]


Tissue and cell line



Reduces tumor growth, antimetastatic, inhibit clonogenicity of BCSCs, induce differentiation, sensitize breast cancer cells to doxorubicin, therapeutic biomarker

Bertoli et al. 2015 [3], Kaboli et al. 2015 [58],

Zhang et al. 2014 [60], Jurmeister et al. 2012 [81], Fu et al. 2011 [62], Shimono et al. 2009 [82]


Tissue and cell line



Inhibit cell growth, invasion and metastasis, induce cell apoptosis, suppress BCSCs, diagnostic and prognostic biomarker, Tamoxifen response

Shen et al. 2017 [83], Li et al. 2016 [84], Flores-Pérez et al. 2016 [85], Bertoli et al. 2015 [3]


Ductal BC,BC and TNBC cell line



Inhibit proliferation, invasion and EMT, prognostic biomarker

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36],

Takahashi et al. 2015 [59], Zhang et al.2014 [60], Fu et al. 2011 [62]


BC and TNBC cell line


ERα, CCND2, ESR1, NOTCH3, SRC-1, SRC-3, GATA-3, ERα, Cx43

Reduces migration, invasion and anti-metastatic

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36],

Kaboli et al. 2015 [58], Shafi et al. 2014 [32], Zhang et al. 2014 [60], Fu et al. 2011 [62], O′ Day et al. 2010 [2]


IDC, Cell line, Tissue, Plasma



Prognostic and diagnostic biomarker, Herceptin resistance

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36], Devlin et al. 2011 [86], Huang et al. 2010 [87]


Tissue and cell line



Suppress breast cancer growth and metastasis, proapoptoic, therapeutic biomarker

Jana et al. 2016 [88], Kaboli et al. 2015 [58], Zheng et al. 2014 [60]


Serum, Tissue



Inhibit migration and invasion, enhance breast cancer cells to cisplatin responsiveness, diagnostic and prognostic biomarker

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36], Zhao et al. 2015 [89], Kodahl et al. 2014 [65]


Cell line


ERα, P27kip1, KIT, P57, PTEN

Tamoxifen resistant luminal type breast cancer and Fulvestrant resistant

Bertoli et al. 2015 [3], Takahashi et al. 2015 [59]

Piva et al. 2013 [30], Fu et al. 2011 [62]


Tissue and Cell line



Inhibited cell proliferation and migration

Liu et al. 2014 [90], Zhang et al.2014 [60]


Cell line, Tissue



Suppress metastasis and migration, proapoptotic, diagnostic and prognostic biomarkers

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36]

Kaboli et al. 2015 [58], Shafi et al. 2014 [32], Zhang et al. 2014 [60]





Proapoptotic, Tamoxifen response

Bertoli et al. 2015 [3], Kaboli et al. 2015 [58]


Heterogenous BC, Tissue



Regulate cell cycle, antiproliferative, diagnostic and prognostic biomarker, regulate Tamoxifen response

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36]

Kaboli et al. 2015 [58], Leivonen et al. 2014 [91], Romero-Cordoba et al. 2012 [92]


Cell line



Cell migration, invasion and metastasis

Bertoli et al. 2015 [3], Schooneveld et al. 2015 [36], Shafi et al. 2014 [32], Fu et al. 2011 [62]


Cell line, Tissue



Anti-proliferative and anti-metastatic, member of miR-200 family

Takahashi et al. 2015 [59], Ye et al. 2015 [93],

Kaboli et al. 2015 [58], Wang et al. 2015 [94]


Cell line, Tissue



Antiproliferative, antimetastatic especially estrogen stimulated breast cancer cells

Hui et al. 2015 [95], Kaboli et al. 2015 [58]


Cell line, BCSCs



Increased tumor formation, downregulation of E-cadherin, maintaining a stem-cell line phenotype

Kaboli et al. 2015 [58], Schwarzenbacher et al. 2013 [61]


Cell line, Tissue



Cell migration, invasion and metastasis, Tamoxifen response

Bertoli et al. 2015 [3], Kaboli et al. 2015 [58]


Tissue, Cell line



Anti-proliferative and anti-metastatic

Kurozumi et al. 2016 [57], Kaboli et al. 2015 [58], Ryu et al. 2013 [96]

Methods to detect miRNAs in breast cancer

Micro-RNAs are quite a smaller size and impossible to detect them with the methods used for mRNA. However, since miRNAs roles become important and also found to be significant biomarkers of diseases including cancers, scientists invested enormous efforts in order to detect them. Nowadays, about 30 methods in total are available to detect miRNA expression profiles. MicroRNA expression profiles in certain diseases, give critical useful information about diagnosis and prognosis. Among these miRNA detection methods, commonly applied to detect miRNA are Northern blotting, Microarray, Bead based flow cytometry, qRT-PCR, In sithu hybridization and Next-Generation Sequencing [36]. Among them, the most standardized method for miRNA analysis is Northern blotting although it is low-throughput [37].

Being a high throughput, miRNA microarrays can be applied several miRNAs in a large number of samples. However, miRNA microarrays is low specificity and low sensitivity due to their extremely short sequence which allows only very little room to fine-tune the hybridization conditions of miRNAs [38]. Another high throughput, high specificity and high sensitivity method for assessment of miRNA is qRT-PCR and this method can also be used for validation of data obtained from other detection platforms [39]. Bead-based flow cytometry and in situ hybridization detection methods are limited to known miRNA structures. However, the latest detection method which gives high throughput, high specificity and high sensitivity is Next-generation sequencing and this method allows to discovery of new miRNA as well as to confirm known miRNA [40].

In breast cancers, miR10b, miR125b and miR145 are consistently found to be down-regulated and miR21, miR155 are consistently up-regulated [41, 42]. It was also reported that miRNAs can still be detected from formalin fixed and paraffin embedded tissue samples, collected blood and serum too. MicroRNAs are stable due to their smaller size that showed tolerance to ribonuclease degradation.

Breast cancer model

All previous studies have identified that canine mammary tumor models are great to study the molecular pathogenesis of human breast cancer due to several similarities such as epidemiological factors and histopathological aspects [4346]. In addition, it is very common that dogs and humans are exposed to equivalent carcinogens as frequently they are living in the same environment. Risk factors and molecular changes in affected mammary tissues for both species are comparable. Most of canine mammary tumors and human breast cancers are also originated from epithelial tissues [47]. In fact, different types of human cancers can be found in dogs too. For example, lymphoma, breast cancer, bone cancer and etc. Furthermore, studies have pointed out specifically that the age of onset and peak incidence among humans and dogs are about the same if their age is calculated proportionately [43]. Spontaneous mammary tumors incidence rate in female dogs is about 25% (1 in 4) while breast cancer incidence rate in women is about 12% (1 in 8). Readily availability of spontaneous canine mammary tumors is one of the factors that makes them a good model to study breast cancer as an alternative to experimental animal models. In particular, similarities including expression of hormone receptors, tumor growth markers, epidermal growth factor receptor, and P53 mutations also strengthen the canine mammary tumor model. Moreover, overexpression of cyclooxygenase-2 (COX-2), a molecule directly involved with mammary carcinogenesis, and matrix metalloproteinase-2 (MMP-2) which plays a role in invasion and metastasis process was detected in both species too [48, 49].

It is noted that miRNA genes between human and canine are highly conserved. A study had been reported that miR15a, miR16, miR17-5p, miR21, miR29b, miR125b, miR155, miR181b and let7 family expression patterns were the same between human breast cancer and canine mammary tumors except miR145 which does not showed changes in canine [50, 51]. As in human breast cancer, miR15a and miR16 expressions were also reduced in canine mammary carcinomas. Furthermore, miR15a and miR16 were shown to be involved in differentiation of malignancy [51]. Computationally analysis results showed that 300 miRNAs amongst canine miRNAs were found to have the same sequences as of those found in human [52]. Also, it has been described that miRNA210 which is regulated by hypoxia, was significantly upregulated in continuous manner throughout canine mammary tumor progression [53]. In human breast cancer, upregulated miRNA210 was reported as a diagnostic and prognostic marker [3, 36].

A study reported that protein expression profiles were comparable between canine mammary tumors and human breast cancers. However, 12 other differentially expressed proteins in metastatic canine mammary tumors have not been studied yet and it remains to be established whether they are associated or not with metastasis of human breast cancers [54]. It is noted that researchers are able to study myoepithelial cell proliferation in canine breast cancer model rather than in human breast cancer due to their incidence rate > 20% and <0.1% respectively [55].

Besides the aforementioned similarities between canine and human breast cancers, other aspects that make canine tumors a good model for human breast cancer is faster aging (7 times more) compared to human due to their shorter life span and additionally the average shorter overall survival rate of dogs diagnosed with cancers [56].

Resources of miRNAs database

MicroRNA database including targets of miRNAs can be retrieved from the following web-based online programs.
  1. 1.
This site was founded by Sam Griffths-Jones and currently governed by Griffiths-Jones lab of University of Manchester, UK. The version 1 of miRNAs database was introduced in 2002 with 218 entries. Total entries became 28, 645 in their latest version 21 that was released in 2014. These entries can be viewed and downloaded by names, keywords, references and annotations of respective miRNAs. This site is also available for naming of newly found miRNAs in order to avoid overlaps.
  1. 2.
Current version is miRNA walk2 and the site handle 15 different species’ information on genes, mRNA and miRNA. This website is controlled by University Heidelberg, Faculty of medicine, Germany. Total 11,748 miRNA and 308,700 genes are documents in this version and generate predicted and validated miRNA-target interactions.
  1. 3.
This site was established by Department of Biological Science and Technology, institute of Bioiformatics National Chiao Tung University of Taiwan. This site is mainly used for identifying not only miRNA targets but also to understand interaction networks such as biological functions of miRNAs against their targets in biological pathways (KEGG pathways).
  1. 4.
Established from the same organization mentioned above in (3). This site facilitates to search experimental verified microRNAs as well as experimental verified miRNA target genes in human, mouse, rat, and other metazoan genomes. Data recorded in this site includes expression profiles of 224 human miRNAs in 18 major normal tissues.
  1. 5.
miRGator is based in Seoul, Korea. Current version 3 provides deep sequencing data of miRNAs that facilitate users to comprehend precursor of miRNAs, its sequences, their final products. Furthermore, miRGator has another two features such as miRNA catalogues and Expression profiles, and miRNA-mRNA target relations and expression correlations.
  1. 6.
This data based was created by the department of radiation oncology, Washington university school of medicine in St. Louis. This web page provides predicted microRNA targets in human, mouse, rat, dog and chicken. This miRDB search engine allows users to search targets of miRNAs by miRNA name directly or gene accession number from GenBank, Gene Symbol and NCBI Gene ID.
  1. 7.
Established by German Research Center for Environmental Health. Differentially regulated miRNA expression in diseases and other biological processes can be divulged from this site.
  1. 8.
The Predicted Targets component of miRecords generates integrated results from 11 established miRNA target prediction programs such as DIANA-microT, MicroInspector, miRanda, MirTarget2, miTarget, NBmiRTar, PicTar, PITA, RNA22, RNAhybrid, and TargetScan/TargertScanS.
  1. 9.

miRGen, developed at the University of Pennsylvania, generates miRNA gene transcription start sites (TSSs), coupled with genome wide maps of transcription factor (TF) binding sites in order to understand mechanisms of miRNA transcription regulation.

Other useful online miRNA related sites were,, ChIPBase, TarBase, starBase,, PmmR (Putative microRNA-microRNA Regulations) and


MicroRNAs can be easily detected with advanced technologies and the continuous investigations supply miRNA as a novel clue for diagnosis and prognosis marker to therapeutic targets. Furthermore, research on delivering miRNAs mimics and/or inhibitors directly into breast cancer tissue to regulate the balance of miRNAs is gaining attention in the field. The miRNA resources mentioned in this paper are useful to generate predicted targeted mRNAs for interested miRNAs candidate. Aberrant miRNA expression in our body such as oncomirs (upregulated miRNAs) and oncosupressors (downregulated miRNAs) could be the sign of diseases and they can be clinically detected by RT-qPCR, digital PCR, microarrays, and next generation sequencing technologies. Signature miRNA profile can be used to distinguish the stages of breast cancer progression and help in early diagnosis, prognosis, and effective treatment for human breast cancer and canine mammary tumor.



Protein argonaute-2


Digeorge syndrome chromosomal region 8


Kyoto encyclopedia genes and genomes




Magnetic resonance imaging


messenger RNA


Protein PAZ


Protein PIWI


precursor microRNA


primary microRNA


RNA-induced silencing complex


TAR RNA binding protein


transfer RNA



Not applicable.


The authors acknowledge the research funding from Trans Disciplinary Research Grant Scheme (TRGS) (5535000) for the financial support.

Availability of data and materials

Not applicable.

Authors’ contributions

RMCY wrote and reviewed the manuscripts. CYK constructed and reviewed the manuscript. Both authors read and approved the final manuscript.

Authors’ information

CYK: Associate professor, Department of Biomedical Science, Molecular Biology laboratory, Faculty of medicine and health sciences, University Putra Malaysia. Founder and president of BioMedKL. Technical advisor for molecular diagnostic at Ramsay Sime Darby Medical Centre, Malaysia. RMCY: PhD candidate, Department of Biomedical Science, Molecular Biology laboratory, Faculty of medicine and health sciences, University Putra Malaysia.

Ethics approval and consent to participate

Not applicable.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

Department of Biomedical Science, Faculty of Medicine and Health Sciences, University Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia
Centre for Diagnostic Nuclear Imaging, University Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia
Institute of Bioscience, University Putra Malaysia, 43400 Serdang, Selangor Darul Ehsan, Malaysia


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