Faculty Collaboration Database

Pappa2 is linked to salt-sensitive hypertension in Dahl S rats. Physiol Genomics 2016 Jan;48(1):62-72

Date

11/05/2015

Pubmed ID

26534937

Pubmed Central ID

PMC4757026

DOI

10.1152/physiolgenomics.00097.2015

Scopus ID

2-s2.0-84953280775 (requires institutional sign-in at Scopus site)   29 Citations

Abstract

A 1.37 Mbp region of chromosome 13 previously identified by exclusion mapping was consistently associated with a reduction of salt-induced hypertension in the Dahl salt-sensitive (SS) rat. This region contained five genes that were introgressed from the salt-insensitive Brown Norway (BN) rat. The goal of the present study was to further narrow that region to identify the gene(s) most likely to protect from salt-induced hypertension. The studies yielded a subcongenic SS rat strain containing a 0.71 Mbp insert from BN (26-P strain) in which salt-induced hypertension was reduced by 24 mmHg. The region contained two protein-coding genes (Astn1 and Pappa2) and a microRNA (miR-488). Pappa2 mRNA in the renal cortex of the protected 26-P was 6- to 10-fold greater than in SS fed a 0.4% NaCl diet but was reduced to levels observed in SS when fed 8.0% NaCl diet for 7 days. Compared with brain nuclei (NTS, RVLM, CVLM) and the adrenal gland, Pappa2 in the renal cortex was the only gene found to be differentially expressed between SS and 26-P and that responded to changes of salt diet. Immunohistochemistry studies found Pappa2 localized in the cytosol of the epithelial cells of the cortical thick ascending limbs. In more distal segments of the renal tubules, it was observed within tubular lumens and most notably bound to the apical membranes of the intercalated cells of collecting ducts. We conclude that we have identified a variant form of Pappa2 that can protect against salt-induced hypertension in the Dahl S rat.

Author List

Cowley AW Jr, Yang C, Kumar V, Lazar J, Jacob H, Geurts AM, Liu P, Dayton A, Kurth T, Liang M

Authors

Allen W. Cowley Jr PhD Professor in the Physiology department at Medical College of Wisconsin
Aron Geurts PhD Professor in the Physiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adrenal Glands
Albuminuria
Animals
Base Pairing
Blood Pressure
Brain Stem
Cell Nucleus
Chromosomes, Mammalian
Fluorescent Antibody Technique
Gene Expression Regulation
Genome
Hypertension
Kidney
Pregnancy-Associated Plasma Protein-A
RNA, Messenger
Rats, Inbred Dahl
Sequence Analysis, DNA
Sodium Chloride Symporters
Sodium Chloride, Dietary