RGD Reference Report - Expression of the Na+/H+ exchanger regulatory protein family in genetically hypertensive rats. - Rat Genome Database

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Expression of the Na+/H+ exchanger regulatory protein family in genetically hypertensive rats.

Authors: Kobayashi, K  Monkawa, T  Hayashi, M  Saruta, T 
Citation: Kobayashi K, etal., J Hypertens. 2004 Sep;22(9):1723-30.
RGD ID: 1580741
Pubmed: PMID:15311100   (View Abstract at PubMed)

OBJECTIVE: To examine a possible involvement of a regulatory protein of Na+/H+ exchanger (NHE) in the increased renal NHE activity in spontaneously hypertensive rats (SHR), we investigated mRNA expression of inhibitory members of the NHE regulatory protein family, NHERF1 and NHERF2, in the kidney. DESIGN: Prehypertensive 4-week-old and hypertensive 11-week-old SHR and age-matched Wistar-Kyoto (WKY) rats were used to determine the changes in NHE activity and NHERF family expression in the kidney. Dahl salt sensitive (DS) and resistant rats were also used to examine whether these changes are specific for SHR. METHODS: mRNA expression in the kidney was quantified by RNase protection assay. The NHE activity in primary cultured proximal tubular cells was measured as Na-dependent pHi recovery rate by the NH4Cl prepulse technique with 2'7'-bis-(2-carboxyethyl)-5.6-carboxyfluorescein (BCECF). RESULTS: NHERF1 mRNA expression was significantly decreased in both prehypertensive and hypertensive SHR in comparison with age-matched WKY rats, whereas NHERF2 mRNA expression was significantly increased in SHR only in the hypertensive period. Antihypertensive treatment did not abolish these changes seen in control SHR. On the other hand, hypertensive DS rats fed a high-salt diet showed significant decreases in NHE activity and NHE3 mRNA expression compared with normotensive DS rats fed a low-salt diet, without significant changes in NHERF1 and NHERF2 mRNA expression. CONCLUSION: These results suggest that decreased expression of NHERF1 may be related to the enhanced NHE activity in SHR and that these changes are likely to be genetically determined, whereas the increased NHERF2 expression may be induced as a compensatory mechanism.



RGD Manual Disease Annotations    Click to see Annotation Detail View

  
Object SymbolSpeciesTermQualifierEvidenceWithNotesSourceOriginal Reference(s)
NHERF1Humanhypertension  ISONherf1 (Rattus norvegicus) RGD 
NHERF2Humanhypertension  ISONherf2 (Rattus norvegicus) RGD 
Nherf1Rathypertension  IEP  RGD 
Nherf1Mousehypertension  ISONherf1 (Rattus norvegicus) RGD 
Nherf2Rathypertension  IEP  RGD 
Nherf2Mousehypertension  ISONherf2 (Rattus norvegicus) RGD 

Objects Annotated

Genes (Rattus norvegicus)
Nherf1  (NHERF family PDZ scaffold protein 1)
Nherf2  (NHERF family PDZ scaffold protein 2)

Genes (Mus musculus)
Nherf1  (NHERF family PDZ scaffold protein 1)
Nherf2  (NHERF family PDZ scaffold protein 2)

Genes (Homo sapiens)
NHERF1  (NHERF family PDZ scaffold protein 1)
NHERF2  (NHERF family PDZ scaffold protein 2)


Additional Information