α1β1

α1β1 integrin functions as a primary collagen receptor, mediating cell adhesion, migration, and extracellular matrix remodeling^[1][2]. Mechanistically, α1β1 activation triggers intracellular signaling via the Ras/ERK and Rac1 pathways, which regulate mesangial cell migration and collagen matrix reorganization^[1][2]. In disease models, α1β1 integrin contributes to Alport syndrome by promoting Rac1-dependent mesangial invasion of glomerular capillaries, exacerbating glomerular basement membrane pathology^[2]. Distinct from related isoforms such as α2β1, α1β1 primarily enhances ERK/AP-1-mediated collagen remodeling rather than p38 MAPK activation, conferring isoform-specific downstream signaling effects^[1][3]. In immune cells, α1β1 integrin synergizes with the interleukin-7 receptor to upregulate RANKL expression, promoting osteoclast differentiation and bone resorption^[4]. Pharmacological studies demonstrate that blocking α1β1 inhibits mesangial migration, collagen remodeling, and osteoclastogenic signaling, underscoring its potential as a therapeutic target for renal and bone-related pathologies^[1][2][4]. Collectively, these findings position α1β1 integrin as a critical modulator of collagen-dependent cellular functions, with isoform-specific signaling, disease relevance, and experimental tractability for pathway-focused interventions.