However, whether TRPC6 inactivation protects the tubulointerstitial compartments in Sprague Dawley rats depends on the disease model examined. These data also suggest that TRPC6 plays a role in the normal function of the glomerular filtration barrier. The increase in TRPC3 and the loss of TRPC5 occurred to the same extent in Trpc6 del/del rats. Immunoblot analysis of renal cortex indicated that AO increased the abundances of TRPC3 and TRPC6, and caused a nearly complete loss of TRPC5 in Trpc6 wt/wt rats. Those changes were equally severe in Trpc6 wt/wt and Trpc6 del/del rats. AO induced mild tubulointerstitial disease characterized by fibrosis, hypercellularity and increased expression of markers of fibrosis and inflammation. AO overload did not induce significant glomerulosclerosis or azotemia in either genotype. AO for 14 and 28 days caused increased urine albumin excretion that was significantly attenuated in Trpc6 del/del rats compared to Trpc6 wt/wt controls. This was assessed in rats with a global and constitutive inactivation of TRPC6 channels ( Trpc6 del/del rats) and in wild-type littermates ( Trpc6 wt/wt rats). In the present study, we examine the role of TRPC6 in the proteinuric state caused by prolonged albumin overload (AO) in Sprague Dawley rats induced by daily injections of exogenous albumin. TRPC6 channels also appear to play a role in driving glomerular disease in aging and in autoimmune glomerulonephritis. ![]() Canonical transient receptor potential-6 ( TRPC6) channels have been implicated in familial and acquired forms of focal and segmental glomerulosclerosis (FSGS), and in renal fibrosis following ureteral obstruction in mice.
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