Glomerular MesangiumMesangial CellsCells, CulturedGlomerulonephritis, MembranoproliferativeCollagen Type IVKidney GlomerulusDiabetic NephropathiesTransforming Growth Factor betaRNA, MessengerRats, Sprague-DawleyPlatelet-Derived Growth FactorProtein Kinase CAngiotensin IIDiabetes Mellitus, ExperimentalCell DivisionGlucoseGlomerulonephritisGlomerulonephritis, IGAAntigens, Thy-1Transforming Growth Factor beta1Glomerulosclerosis, Focal SegmentalFibronectinsInterleukin-1