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2016 ; 291
(37
): 19425-36
Nephropedia Template TP
gab.com Text
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English Wikipedia
Cardiac-restricted Overexpression of TRAF3 Interacting Protein 2 (TRAF3IP2)
Results in Spontaneous Development of Myocardial Hypertrophy, Fibrosis, and
Dysfunction
#MMPMID27466370
Yariswamy M
; Yoshida T
; Valente AJ
; Kandikattu HK
; Sakamuri SS
; Siddesha JM
; Sukhanov S
; Saifudeen Z
; Ma L
; Siebenlist U
; Gardner JD
; Chandrasekar B
J Biol Chem
2016[Sep]; 291
(37
): 19425-36
PMID27466370
show ga
TRAF3IP2 (TRAF3 interacting protein 2; previously known as CIKS or Act1) is a key
intermediate in the normal inflammatory response and the pathogenesis of various
autoimmune and inflammatory diseases. Induction of TRAF3IP2 activates I?B kinase
(IKK)/NF-?B, JNK/AP-1, and c/EBP? and stimulates the expression of various
inflammatory mediators with negative myocardial inotropic effects. To investigate
the role of TRAF3IP2 in heart disease, we generated a transgenic mouse model with
cardiomyocyte-specific TRAF3IP2 overexpression (TRAF3IP2-Tg). Echocardiography,
magnetic resonance imaging, and pressure-volume conductance catheterization
revealed impaired cardiac function in 2-month-old male transgenic (Tg) mice as
evidenced by decreased ejection fraction, stroke volume, cardiac output, and peak
ejection rate. Moreover, the male Tg mice spontaneously developed myocardial
hypertrophy (increased heart/body weight ratio, cardiomyocyte cross-sectional
area, GATA4 induction, and fetal gene re-expression). Furthermore, TRAF3IP2
overexpression resulted in the activation of IKK/NF-?B, JNK/AP-1, c/EBP?, and p38
MAPK and induction of proinflammatory cytokines, chemokines, and extracellular
matrix proteins in the heart. Although myocardial hypertrophy decreased with age,
cardiac fibrosis (increased number of myofibroblasts and enhanced expression and
deposition of fibrillar collagens) increased progressively. Despite these adverse
changes, TRAF3IP2 overexpression did not result in cell death at any time period.
Interestingly, despite increased mRNA expression, TRAF3IP2 protein levels and
activation of its downstream signaling intermediates remained unchanged in the
hearts of female Tg mice. The female Tg mice also failed to develop myocardial
hypertrophy. In summary, these results demonstrate that overexpression of
TRAF3IP2 in male mice is sufficient to induce myocardial hypertrophy, cardiac
fibrosis, and contractile dysfunction.
|*MAP Kinase Signaling System
[MESH]
|*Stroke Volume
[MESH]
|Adaptor Proteins, Signal Transducing/*biosynthesis/genetics
[MESH]