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Staining with hematoxylin and eosin http://www.selleckchem.com/products/Imatinib-Mesylate.html (HE) or periodic acid-Schiff (PAS) was carried out using a standard protocol. For electron microscopy, small wedge samples were cut from the kidneys and fixed in 2.5% glutaraldehyde, then dehydrated in graded ethanol and embedded in epoxy resin. Thin sections were stained with uranyl acetate. Fresh-frozen tissues were homogenized in 0.4?mol/L perchloric acid. After centrifugation, the clear supernatant was neutralized, and ten microliters of neutralized supernatant was applied to HPLC (Lachrom Elite, Hitachi, Japan) with a Capcell Pak C18 (Shiseido, Tokyo, Japan) column (Norman et?al. 1994). Immunohistochemical analysis was carried out using the primary antibodies as listed in the legends for Fig.?5. Fresh-frozen kidney tissue sections (5?��m in thickness) were used by a standard protocol. The tissue sections were preblocked for 10?min in PBS containing 5% BSA. The following primary antibodies were used: rabbit polyclonal anti-nephrin antibody (ProSci Inc., Poway, CA, USA); rabbit polyclonal anti-CD2AP antibody(SC-9137) (Santa Cruz Inc., Santa Cruz, CA, USA); rabbit polyclonal anti-��-Actinin-4(ACTN-4) antibody (Zymed Laboratories, South San Francisco, CA, USA); rabbit polyclonal anti-VEGF antibody (Thermo Scientific, Astmoor Runcorn, UK); rabbit polyclonal anti-VEGF-receptor antibody (abcam, Tokyo, Japan); rat monoclonal anti-perlecan antibody (Seikagaku, Tokyo, Japan); and goat polyclonal anti-agrin antibody (Santa Cruz Inc.). For nephrin, CD2AP, http://www.selleck.cn/products/mi-773-sar405838.html ACTN-4, VEGF, and VEGF receptor, the sections http://www.selleckchem.com/products/VX-770.html were incubated with primary antibody at 4��C overnight and then the sections were incubated with biotinylated the goat anti-rabbit (1:100) (Vector Laboratories, Burlingame, CA, USA) for 1?h at room temperature. After washing twice in PBS, avidin-biotin-peroxidase solution was added for 30?min at room temperature. For perlecan and agrin, after the sections were incubated with primary antibody at 4��C overnight, the sections were incubated with anti-rat or goat antibody labeling with the Dako EnVision reagent/horseradish peroxidase conjugated polymer (Dako, Tokyo, Japan) for 30?min. The color reaction was carried out by adding 0.02% diaminobenzene and 0.005% H2O2 in PBS for 5?min. Counterstaining was carried out with hematoxylin. The negative control experiment was carried out without the primary antibody. Mouse podocyte cells were grown in RPMI 1640 with 10?U/mL of IFN-�� and 10% fetal bovine serum (FBS) at 33��C. To obtain differentiated podocytes, MPCs were cultured for 10?days in IFN-�� (-) media in collagen type 4 coated dishes (Mundel et?al. 1997), with NHL7 cells and embryonic fibroblasts used as control cells. Results obtained from the knockout mice were compared with those of their wild-type litter mates using a Student��s t test, with P?