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2015 ; 65
(5
): 1111-7
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English Wikipedia
Mutation of SH2B3 (LNK), a genome-wide association study candidate for
hypertension, attenuates Dahl salt-sensitive hypertension via inflammatory
modulation
#MMPMID25776069
Rudemiller NP
; Lund H
; Priestley JR
; Endres BT
; Prokop JW
; Jacob HJ
; Geurts AM
; Cohen EP
; Mattson DL
Hypertension
2015[May]; 65
(5
): 1111-7
PMID25776069
show ga
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.