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Dystrophin and Dp140 in the adult rodent kidney
1Department of Pathology, Harvard Medical School, Boston, Massachusetts, USA.
Abstract:
Full-length dystrophin and a truncated carboxy-terminal isoform, Dp140, also encoded by the dystrophin gene, are expressed in rodent kidney. Dystrophin is localized to the vascular smooth muscle and mesangial cells. Dp140 was initially identified in the brain as well as kidney. In kidney, Dp140 is localized to the basal surface of tubule epithelial cells. Morphology and double-labeling suggest that it is restricted to the ascending loop of Henle, distal convoluted tubule, and proximal end of the collecting ducts. Because both dystrophin and Dp140 contain the same carboxy-terminal domain--which in skeletal muscle forms a link to integral membrane proteins and in turn to the extracellular matrix--Dp140 in the tubule epithelium might contribute to anchoring the basal aspect of the cells to the basement membrane. The identification of dystrophin gene products in kidney parenchyma also raises the possibility of subtle renal abnormalities, not previously suspected, as part of the Duchenne muscular dystrophy phenotype.
Insights
The dystrophin gene produces full-length dystrophin and Dp140 in rodent kidneys. Dp140 anchors tubule epithelial cells to the basement membrane, potentially explaining subtle kidney abnormalities in Duchenne muscular dystrophy.
Area of Science:
- Nephrology
- Molecular Biology
- Genetics
Background:
- The dystrophin gene encodes full-length dystrophin and a carboxy-terminal isoform, Dp140.
- Both proteins are expressed in rodent kidney tissue.
- Dystrophin localizes to vascular smooth muscle and mesangial cells.
Purpose of the Study:
- To investigate the localization and potential function of Dp140 in the rodent kidney.
- To explore the implications of dystrophin gene product expression in kidney for Duchenne muscular dystrophy.
Main Methods:
- Immunohistochemical analysis using morphology and double-labeling techniques.
- Localization studies of dystrophin and Dp140 within kidney structures.
Main Results:
- Dp140 is localized to the basal surface of tubule epithelial cells, specifically in the ascending loop of Henle, distal convoluted tubule, and proximal collecting ducts.
- The carboxy-terminal domain of Dp140 suggests a role in anchoring epithelial cells to the basement membrane.
- Expression of dystrophin gene products in kidney parenchyma is identified.
Conclusions:
- Dp140 likely plays a structural role in the kidney tubule epithelium, anchoring cells to the basement membrane.
- The presence of dystrophin gene products in the kidney suggests a potential link to renal abnormalities in Duchenne muscular dystrophy patients.