Spermatogonial stem The insulin-like growth factor 1 (IGF-1) receptor cells (SSCs) offer the basis for spermatogenesis. Inside a method comparable to hematopoietic stem cell transplantation, SSCs colonize the niche of recipient testes and reinitiate spermatogenesis following microinjection into the seminiferous tubules. Nonetheless, little is recognized about the neverless homing mechanism of SSCs. Here we examine the position of adhesion molecules in SSC homing. SSCs isolated from mice carrying loxP-tagged beta 1-integrin alleles had been ablated for beta 1-integrin expression by in vitro adenoviral cre transduction. The beta 1-integrin mutant SSCs showed considerably decreased capability to recolonize recipient testes in vivo and also to attach to laminin molecules in vitro. In contrast, genetic ablation of E-cadherin didn't impair homing, and E-cadherin mutant SSCs completed ordinary spermatogenesis. In addition, the deletion of beta 1-integrin on Sertoli cells diminished SSC homing. These results identify beta 1-integrin as an vital adhesion receptor for SSC homing and its association with laminin is significant in various steps of SSC homing.