Possible Involvement of Anorexigenic Protein, Nesfatin/Nucleobindin-2 (NUCB2) in Blood Pressure Regulation by Regulating Water Reabsorption in Renal Collecting DuctHiroyuki Shimizu1* and Aya Osaki2
- *Corresponding Author:
- Hiroyuki Shimizu
Department of Diabetes and Endocrinology
International University of Health and Welfare Hospital
Iguchi 537-3 Nasushiobara 329-2763 Japan
Tel: 81-287-37-2221, Extn. 2731
E-mail: [email protected]
Received Date: October 04, 2014; Accepted Date: November 03, 2014; Published Date: November 05, 2014
Citation: Shimizu H, Osaki A (2014) Possible Involvement of Anorexigenic Protein, Nesfatin/Nucleobindin-2 (NUCB2) in Blood Pressure Regulation by Regulating Water Reabsorption in Renal Collecting Duct. J Cytol Histol 5:291 doi:10.4172/2157-7099.1000291
Copyright: © 2014 Shimizu H, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Nesfatin/nucleobindin-2 (NUCB2), a precursor protein of anorexigenic protein, nesfatin-1, is ubiquitously expressed in the body. The finding that peripheral administration of nesfatin-1 increases blood pressure indicates a possible involvement of nesfatin-1 in the regulation of blood pressure. The present studies were undertaken to investigate a possible involvement of nesfatin/NUCB2 in the regulation of blood pressure. The immunoreactivity against nesfatin/NUCB2 was selectively found in vascular endothelial cells of aorta, pulmonary artery and renal artery, cardiac muscle and skeletal striated muscle cells, but not in vascular smooth muscle cells at all. Furthermore, the immunoreactivity against nesfatin/NUCB2 was selectively found in renal collecting duct cells, which contain aquaporin (AQP)-2 and/or epithelial sodium channel (ENaC). In medullary collecting ducts, cells expressing nesfatin/ NUCB2 co-expressed AQP-2, but did not co-expressed AQP-2 in renal cortical collecting ducts. On the other hand, collecting ductal cells expressing ENaC were totally compatible with those expressing nesfatin/NUCB2 in both renal medullary and cortical collecting ducts. Thus, there is a possibility that nesfatin/NUCB2 is involved in the regulation of blood pressure through increased water reabsorption in the kidney.