Abstract
In the past few decades an enormous amount of data became known to clarify the molecular composition and architecture of tight junctions (TJs). Despite the efforts, the expression and function of several TJ genes and proteins in breast carcinoma are still not known and some of the data are contradictory. The expression of forty-four TJ associated genes was examined at mRNA level in eighteen invasive ductal breast carcinoma samples and corresponding normal breast tissues by using low density array PCR. Expressions of claudins (CLDNs) 5, 10, 16, 17, and 18, and ZO-1, ZO-2 were evaluated by immunohistochemistry as well. Using immunohistochemical phenotype as a surrogate for the genetic subtype, 11 luminal A, 3 luminal B, 3 triple negative and one HER2+ cases were included. Ten genes were significantly downregulated in tumors compared with normal breast tissues (CLDNs 5, 10, 16, 18, 19, CTNNAL1, JAM-B, ZO-1, ZO-2 and PARD3), whereas one gene (CLDN17) was significantly up-regulated in tumors when compared with normal breast. At protein level CLDNs 5, 10, 16, 18, ZO-1 and ZO-2 were downregulated in tumors as compared with normal breast tissue. CLDN17 showed variable expression in tumor tissues in comparison to normal breast. In the single HER2+ tumor when compared with the other subtypes CLDNs 5, 16, 17, 18, CTNNAL1, JAM-B, ZO-1, ZO-2 and PARD3 genes were found to be upregulated. We found altered TJ genes and proteins whose expression has not yet been associated with breast carcinoma. Our findings show a tendency of TJ genes and proteins to be downregulated in breast cancer. Further studies are necessary to examine whether the downregulation of the above mentioned TJ associated genes and proteins may contribute to the malignant progression of invasive ductal breast carcinomas.
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Abbreviations
- AJ-:
-
Adherens junctions
- BSA-:
-
Bovine serum albumine
- CDC42-:
-
Cell division cycle 42 (GTP binding protein, 25 kDa)
- CGN-:
-
Cingulin
- CLDN-:
-
Claudin
- CLDN1-:
-
Claudin 1
- CLDN10-:
-
Claudin 10
- CLDN11-:
-
Claudin 11 (oligodendrocyte transmembrane protein)
- CLDN12-:
-
Claudin 12
- CLDN14-:
-
Claudin 14
- CLDN15-:
-
Claudin 15
- CLDN16-:
-
Claudin 16
- CLDN17-:
-
Claudin 17
- CLDN18-:
-
Claudin 18
- CLDN19-:
-
Claudin 19
- CLDN2-:
-
Claudin 2
- CLDN20-:
-
Claudin 20
- CLDN3-:
-
Claudin 3
- CLDN4-:
-
Claudin 4
- CLDN5-:
-
Claudin 5
- CLDN6-:
-
Claudin 6
- CLDN7-:
-
Claudin 7
- CLDN8-:
-
Claudin 8
- CLDN9-:
-
Claudin 9
- CLDND2-:
-
Claudin domain containing 2
- CRB3-:
-
Crumbs homolog 3 (Drosophila)
- CTNNAL1-:
-
Catenin (cadherin-associated protein), alpha-like 1
- CTNNBIP1-:
-
Catenin, beta interacting protein 1
- DAPI-:
-
4′-6-Diamidino-2-phenylindole’
- F11R-:
-
F11 receptor
- GAPDH-:
-
Glyceraldehyde-3-phosphate dehydrogenase
- HPRT1-:
-
Hypoxanthine phosphoribosyltransferase 1
- IDC-:
-
Invasive ductal carcinoma
- JAM-B-:
-
Junctional adhesion molecule B
- JAM-C-:
-
Junctional adhesion molecule C
- MAGI1-:
-
Membrane associated guanylate kinase, WW and PDZ domain containing 1
- MAGIX-:
-
MAGI family member, X-linked
- MARK2-:
-
MAP/microtubule affinity-regulating kinase
- MLLT4-:
-
Myeloid/lymphoid or mixed-lineage leukemia (trithorax homolog, Drosophila); translocated to, 4
- MPDZ-:
-
Multiple PDZ domain protein
- MPP5-:
-
Membrane protein, palmitoylated 5 (MAGUK p55 subfamily member 5)
- OCLN-:
-
Occludin
- PARD3-:
-
par-3 partitioning defective 3 homolog
- PARD6A-:
-
par-6 partitioning defective 6 homolog alpha
- PBS-:
-
Phosphate buffered saline
- RHOA-:
-
Ras homolog gene family, member A
- RPL13A-:
-
Ribosomal protein L13a
- SDHA-:
-
Succinate dehydrogenase complex, subunit A, flavoprotein (Fp)
- SYMPK-:
-
Symplekin
- TGFB1-:
-
Transforming growth factor, beta 1
- TJ-:
-
Tight junction
- ZO-1-:
-
Tight junction protein 1 (zona occludens 1)
- ZO-2-:
-
Tight junction protein 2 (zona occludens 2)
- ZO-3-:
-
Tight junction protein 3 (zona occludens 3)
- TLDA-:
-
TaqMan Low Density Array
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Acknowledgements
We thank Rigóné Káli Elvira for the careful reading of our manuscript and her valuable comments. This study was supported by grants: AVON-EAGC 2005, MKOT–GSK 2006, MKOT-GSK 2008, OTKA- 49559 (2005–2009), ETT-088-01/2009.
Competing interests
The author(s) declare that they have no financial or non-financial competing interests. They do not hold any patents relating to the content of this manuscript.
Authors’ contributions
A-MT and JK analysed the selected cases, evaluated the immunohistochemical results and wrote the article. AMSz helped in selecting the genes for TLDA and isolated RNA with A-MT. EJ carried out the immunohistochemical reactions. ZsS participated in the evaluation of the immunohistochemical reactions and in the writing of the manuscript in its final stage. LH, IAM, ZsB, IB and AZ performed surgery and provided samples. SF performed biopsy of specimens after surgery.
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ESM. 1
The relevant literature data on TJ gene and protein expression in breast carcinomas are presented in Supplementary Table 1. The primary and secondary antibodies used for TJ protein immunodetection are presented in Supplementary Table 2 (DOC 148 kb)
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Tőkés, AM., Szász, A.M., Juhász, É. et al. Expression of Tight Junction Molecules in Breast Carcinomas Analysed by Array PCR and Immunohistochemistry. Pathol. Oncol. Res. 18, 593–606 (2012). https://doi.org/10.1007/s12253-011-9481-9
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DOI: https://doi.org/10.1007/s12253-011-9481-9