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Generation and phenotypic analysis of CHIF knockout mice
Roman Aizman1, Carol Asher, Maria Füzesi
1Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel.
American Journal of Physiology. Renal Physiology
|August 9, 2002
Summary
Corticosteroid hormone-induced factor (CHIF) plays a key role in regulating kidney function. CHIF knockout mice exhibit altered responses to potassium loading and furosemide treatment, indicating its importance in ion transport.
Area of Science:
- Nephrology
- Molecular Biology
- Physiology
Background:
- Corticosteroid hormone-induced factor (CHIF) is an epithelial-specific protein belonging to the FXYD family.
- FXYD proteins are known to interact with and regulate the Na(+)-K(+)-ATPase, a key ion transporter.
Purpose of the Study:
- To characterize the mouse CHIF gene.
- To investigate the physiological role of CHIF through targeted gene disruption and phenotypic analysis.
Main Methods:
- Generation of CHIF knockout mice.
- Phenotypic analysis under normal, high-potassium, and low-sodium diet conditions.
- Assessment of response to furosemide treatment in potassium-loaded mice.
Main Results:
- CHIF knockout mice are viable and show no abnormalities under normal conditions.
- Potassium loading in knockout mice led to a twofold increase in urine volume and elevated glomerular filtration rate.
- Furosemide treatment in potassium-loaded knockout mice resulted in significant lethality compared to wild-type controls.
Conclusions:
- CHIF influences renal function, particularly in response to potassium loading and diuretic stress.
- The data suggest CHIF's role in regulating Na(+)-K(+)-ATPase activity is specific to the kidney's outer and inner medullary ducts.