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ISSN : 1225-2964(Print)
ISSN : 2287-3317(Online)
Annals of Animal Resource Sciences Vol.27 No.2 pp.87-94
DOI : https://doi.org/10.12718/AARS.2016.27.2.87

Matrix Metalloproteinase-9 (MMP-9) Expression Pattern in Bovine Testes

Tae Il Kwak1, Won Young Lee2, Ha Yeon Jung3, Seung Yoon Lee4, Hyuk Song1*
1Department of Stem Cells and Regenerative Bioology, Konkuk University, Seoul 05029, Korea
2Department of Food Bioscience, Konkuk University, Chungju 27478, Korea
3Dairy Science Division, National Institute of Animal Science, RDA, Cheonan 31000, Korea
4HanByol Farm Tech (Swine Consulting Group), Gyeonggi 12259, Korea
*Corresponding author: Hyuk Song, Department of Stem Cells and Regenerative Biology, Konkuk University, Seoul 05029, Korea. Tel: +82-2-450-0562, E-mail; songh@konkuk.ac.kr

Abstract

Identification of specific marker proteins in cells is useful for isolating cells and determining their cellular characteristics and functions. Based on our previous study showing that matrix metalloproteinase 9 (MMP-9) can be used as a marker for porcine spermatogonia, the expression pattern of MMP-9 was determined in both pre- (5-month old) and post-pubertal (11–month old) bovine testes. Histological analysis revealed that spermatogonia were located near the basement membrane in both testes, while spermatozoa were not detected in the 5-month old pre-pubertal bovine testes and epididymides. Mature spermatozoa were observed in the 11-month bovine testes and epididymides, and MMP-9 expression in 11-month old bovine testes was lower than 5-month old testes, according to reverse transcription-PCR and real-time-PCR data. To determine the specific expression sites of MMP-9 in the bovine testes, immunohistochemistry was performed. Expression of MMP-9 was observed in cells near the basement membrane of seminiferous tubules in both 5- and 11-month old testes. Furthermore, MMP-9 positive cells expressed protein gene product 9.5 (PGP9.5) and deleted in azoospermia (DAZL) that are already known as bovine spermatogonial stem cells markers. In the present study, MMP-9 expression was identified in both pre- and post-pubertal bovine spermatogonia expressing PGP9.5 and DAZL, and located near the basement membrane of seminiferous tubules. Thus, MMP-9 can be used as a marker for bovine spermatogonia, and may provide useful platforms for understanding the interaction between germ cells and extracellular matrix during spermatogenesis in the seminiferous tubules.

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