Journal: Function
Article Title: Thick Ascending Limb Specific Inactivation of Myh9 and Myh10 Myosin Motors Results in Progressive Kidney Disease and Drives Sex-specific Cellular Adaptation in the Distal Nephron and Collecting Duct
doi: 10.1093/function/zqae048
Figure Lengend Snippet: Changes in ER chaperone expression and ER stress/unfolded protein response proteins are observed in Myh9&10 TAL-cKO mice. (A) Immunostained kidney sections from 13-week-old male and female Myh9&10 TAL-cKO (TAL-cKO) and littermate controls ( Myh9 f/f ; Myh10 f/f ; Umod +/+ ) show higher levels of the ER chaperone calreticulin (CALR) and accumulation within dilated tubules that also have uromodulin (UMOD) accumulation. CALR co-localizes with the accumulated UMOD in TAL-cKO kidneys. There are also dilated tubules with loss of UMOD that show varying levels of CALR expression. Scale bars = 20µm. (n=3 each). (B, C) Western blot analysis of whole kidney lysates shows higher CALR expression in 13-week-old male and female TAL-cKO mice compared to the littermate control kidneys (n=3 each). (D, E) Immunoblots of whole kidney lysates from 13-week-old male and female control and TAL-cKO kidneys show no changes in total calnexin (CANX) protein levels (~78kDa) (n=3 each). (F, G) Immunoblot analysis of whole kidney lysates from 13-week-old male and female control and TAL-cKO kidneys shows ER unfolded protein response (UPR) protein ATF6 levels (~105kDa) are significantly higher in female TAL-cKO kidneys compared to littermate control kidneys (n=6 each). (H, I) Immunoblot analysis of ER UPR response protein XBP1 in whole kidney lysates from 13-week-old TAL-cKO mice shows significantly lower XBP1 protein levels (~40kDa) (indicating apoptotic phase) compared to littermate control kidneys (n=6 each). Transferrin receptor (TFRC), tubulin (TUB), and Gapdh are loading controls and L = Ladder Lane. (J-Q) Super resolution images of 13-week-old control and TAL-cKO kidneys immunostained for UMOD and the endoplasmic reticulum (ER) tubule-associated protein reticulon 4 (RTN4). (J-M) In control kidney TAL cells, UMOD is enriched along the apical (luminal) membrane while RTN4 is present as intracellular puncta. (N-Q) In TAL-cKO kidneys, UMOD accumulates within TAL segments, the cells of which exhibit more intense RTN4 staining that appears to partially colocalize with intracellular UMOD, suggesting retention of UMOD within the ER. Scale bars: L, P = 20µm, M, Q (insets) = 5µm. Immunoblot results were normalized to controls in individual blots (n=3 per blot, n=3-6 total) and analyzed by unpaired t test with either Welch’s correction or Mann-Whitney test.
Article Snippet: Sino Biological developed the polyclonal IgG custom antibody against mouse MYH9 protein using the amino acid sequence CSDEEVDGKADGADAKAAE.
Techniques: Expressing, Western Blot, Control, Membrane, Staining, MANN-WHITNEY