Immunoglobulin G immunostaining was used as negative control for TGFβ (A and E), fibronectin (I) and collagen type IV (M) in normoglycaemic adrenalectomized rats. Renal immunostaining (brown) in normoglycaemic adrenalectomized rats is presented for TGFβ (B and F), fibronectin (J), collagen type IV (N) and PAS (Q). Renal immunostaining (brown) is increased in diabetic adrenalectomized rats for TGFβ (C and G), fibronectin (K), collagen type IV (O) and PAS (red staining, R). Treatment of adrenalectomized diabetic rats with the aldosterone synthase inhibitor FAD286 reduced renal immunostaining (brown) for TGFβ (D and H), fibronectin (L), collagen type IV (P) and PAS (red staining, S). Scale bars represent 50 μm.