Mutation of SH2B3 (LNK), a genome-wide association study candidate for hypertension, attenuates Dahl salt-sensitive hypertension via inflammatory modulation. Hypertension 2015 May;65(5):1111-7
Date
03/18/2015Pubmed ID
25776069Pubmed Central ID
PMC4412596DOI
10.1161/HYPERTENSIONAHA.114.04736Scopus ID
2-s2.0-84937509309 (requires institutional sign-in at Scopus site) 58 CitationsAbstract
Human genome-wide association studies have linked SH2B adaptor protein 3 (SH2B3, LNK) to hypertension and renal disease, although little experimental investigation has been performed to verify a role for SH2B3 in these pathologies. SH2B3, a member of the SH2B adaptor protein family, is an intracellular adaptor protein that functions as a negative regulator in many signaling pathways, including inflammatory signaling processes. To explore a mechanistic link between SH2B3 and hypertension, we targeted the SH2B3 gene for mutation on the Dahl salt-sensitive (SS) rat genetic background with zinc-finger nucleases. The resulting mutation was a 6-bp, in-frame deletion within a highly conserved region of the Src homology 2 (SH2) domain of SH2B3. This mutation significantly attenuated Dahl SS hypertension and renal disease. Also, infiltration of leukocytes into the kidneys, a key mediator of Dahl SS pathology, was significantly blunted in the Sh2b3(em1Mcwi) mutant rats. To determine whether this was because of differences in immune signaling, bone marrow transplant studies were performed in which Dahl SS and Sh2b3(em1Mcwi) mutants underwent total body irradiation and were then transplanted with Dahl SS or Sh2b3(em1Mcwi) mutant bone marrow. Rats that received Sh2b3(em1Mcwi) mutant bone marrow had a significant reduction in mean arterial pressure and kidney injury when placed on a high salt diet (4% NaCl). These data further support a role for the immune system as a modulator of disease severity in the pathogenesis of hypertension and provide insight into inflammatory mechanisms at play in human hypertension and renal disease.
Author List
Rudemiller NP, Lund H, Priestley JR, Endres BT, Prokop JW, Jacob HJ, Geurts AM, Cohen EP, Mattson DLAuthor
Aron Geurts PhD Professor in the Physiology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Adaptor Proteins, Signal TransducingAnimals
Blood Pressure
DNA
Electrophoresis, Polyacrylamide Gel
Genome-Wide Association Study
Hypertension
Immunity, Cellular
Inflammation
Kidney
Mutation
Proteins
Rats
Rats, Inbred Dahl
Rats, Mutant Strains
Real-Time Polymerase Chain Reaction
Signal Transduction
T-Lymphocytes
