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Evidence for a 12 kDa "Carrier Protein" for Natriuretic Hormone
1Division of Nephrology, Department of Medicine, David Geffen School of Medicine, University of California Los Angeles , Los Angeles, CA , USA.
Frontiers in Endocrinology
|December 6, 2014
Summary
Researchers are closer to identifying a natriuretic hormone that inhibits Na-K-ATPase. Evidence suggests isolating its 12 kDa carrier protein from hypertensive plasma is key, as this complex predominates over the final 408 Da hormone.
Area of Science:
- Biochemistry
- Cardiovascular Physiology
- Endocrinology
Background:
- The existence of a Na-K-ATPase-inhibiting natriuretic hormone is under investigation.
- Hypertension is associated with alterations in natriuretic hormone activity.
Purpose of the Study:
- To review evidence supporting the isolation of a carrier protein for natriuretic hormone.
- To characterize the molecular weights and inhibitory properties of the carrier protein and the final hormone.
Main Methods:
- Review of existing literature on natriuretic hormone isolation and characterization.
- Analysis of molecular weights of the carrier protein and the final hormone.
- Assessment of Na-K-ATPase inhibitory activity.
Main Results:
- A 12 kDa carrier protein and a 408 Da final hormone that inhibit Na-K-ATPase have been identified.
- The complex containing the carrier protein exhibits predominant inhibitory activity.
- The carrier protein's potential identity as proANF (17 kDa) is discussed, with possible cleavage into 14 kDa and 3 kDa components.
Conclusions:
- Isolating the 12 kDa carrier protein from hypertensive plasma is a crucial step in identifying the natriuretic hormone.
- The carrier protein plays a significant role in Na-K-ATPase inhibition.
- Further research is needed to confirm the identity of the carrier protein and its relationship to proANF.
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