Effects of extracellular matrices and lectin Dolichos biflorus agglutinin on cell adhesion and self-renewal of bovine gonocytes cultured in vitro
Sung-Min Kim A C , Mayako Fujihara A B , Mahesh Sahare A , Naojiro Minami A , Masayasu Yamada A and Hiroshi Imai A D
+ Author Affiliations
- Author Affiliations
A Laboratory of Reproductive Biology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan.
B Smithsonian Conservation Biology Institute, Center for Species Survival, National Zoological Park, VA 22630, USA.
C Present address: Institute for Biogenesis Research, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii 96813, USA.
D Corresponding author. Email: imai@kais.kyoto-u.ac.jp
Reproduction, Fertility and Development 26(2) 268-281 https://doi.org/10.1071/RD12214
Submitted: 5 July 2012 Accepted: 13 December 2012 Published: 21 February 2013
Abstract
Surface molecules of primitive male germ cells, gonocytes, are essential components for regulating cell adhesion and maintaining self-renewal in mammalian species. In domestic animals, the stage-specific glycan epitope α-N-acetylgalactosamine (GalNAc) is recognised by the lectin Dolichos biflorus agglutinin (DBA) and is found on the surface of gonocytes and spermatogonia. Gonocytes from bovine testis formed mouse embryonic stem-like cell colonies on plates that had been coated with DBA or extracellular matrix (ECM) components, such as gelatin (GN), laminin (LN) and poly-L-lysine (PLL). The number of colonies on the DBA-coated plate was significantly higher than that on the GN-, LN- and PLL-coated plates. Pretreating gonocytes with DBA to neutralise the terminal GalNAc residues strongly suppressed colony formation. Furthermore, expression of a germ cell-specific gene and pluripotency-related transcription factors was increased considerably on the DBA-coated plates. These results suggest that the GalNAc residues on gonocytes can recognise precoated DBA on plates and the resulting GalNAc–DBA complexes support germ cell and stem cell potentials of gonocytes in vitro. These glycan complexes, through the GalNAc epitope, may provide a suitable microenvironment for the adhesion and cell proliferation of gonocytes in culture.
Additional keywords: cattle, DBA, ECM, glycan epitope, male germ cells, N-acetylgalactosamine, spermatogonia, testis.
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