TY - JOUR
T1 - Cytoskeleton stiffness regulates cellular senescence and innate immune response in Hutchinson–Gilford Progeria Syndrome
AU - Mu, Xiaodong
AU - Tseng, Chieh
AU - Hambright, William S.
AU - Matre, Polina
AU - Lin, Chih Yi
AU - Chanda, Palas
AU - Chen, Wanqun
AU - Gu, Jianhua
AU - Ravuri, Sudheer
AU - Cui, Yan
AU - Zhong, Ling
AU - Cooke, John P.
AU - Niedernhofer, Laura J.
AU - Robbins, Paul D.
AU - Huard, Johnny
N1 - © 2020 The Authors. Aging Cell published by the Anatomical Society and John Wiley & Sons Ltd.
PY - 2020/7/25
Y1 - 2020/7/25
N2 - Hutchinson–Gilford progeria syndrome (HGPS) is caused by the accumulation of mutant prelamin A (progerin) in the nuclear lamina, resulting in increased nuclear stiffness and abnormal nuclear architecture. Nuclear mechanics are tightly coupled to cytoskeletal mechanics via lamin A/C. However, the role of cytoskeletal/nuclear mechanical properties in mediating cellular senescence and the relationship between cytoskeletal stiffness, nuclear abnormalities, and senescent phenotypes remain largely unknown. Here, using muscle-derived mesenchymal stromal/stem cells (MSCs) from the Zmpste24−/− (Z24−/−) mouse (a model for HGPS) and human HGPS fibroblasts, we investigated the mechanical mechanism of progerin-induced cellular senescence, involving the role and interaction of mechanical sensors RhoA and Sun1/2 in regulating F-actin cytoskeleton stiffness, nuclear blebbing, micronuclei formation, and the innate immune response. We observed that increased cytoskeletal stiffness and RhoA activation in progeria cells were directly coupled with increased nuclear blebbing, Sun2 expression, and micronuclei-induced cGAS-Sting activation, part of the innate immune response. Expression of constitutively active RhoA promoted, while the inhibition of RhoA/ROCK reduced cytoskeletal stiffness, Sun2 expression, the innate immune response, and cellular senescence. Silencing of Sun2 expression by siRNA also repressed RhoA activation, cytoskeletal stiffness and cellular senescence. Treatment of Zmpste24−/− mice with a RhoA inhibitor repressed cellular senescence and improved muscle regeneration. These results reveal novel mechanical roles and correlation of cytoskeletal/nuclear stiffness, RhoA, Sun2, and the innate immune response in promoting aging and cellular senescence in HGPS progeria.
AB - Hutchinson–Gilford progeria syndrome (HGPS) is caused by the accumulation of mutant prelamin A (progerin) in the nuclear lamina, resulting in increased nuclear stiffness and abnormal nuclear architecture. Nuclear mechanics are tightly coupled to cytoskeletal mechanics via lamin A/C. However, the role of cytoskeletal/nuclear mechanical properties in mediating cellular senescence and the relationship between cytoskeletal stiffness, nuclear abnormalities, and senescent phenotypes remain largely unknown. Here, using muscle-derived mesenchymal stromal/stem cells (MSCs) from the Zmpste24−/− (Z24−/−) mouse (a model for HGPS) and human HGPS fibroblasts, we investigated the mechanical mechanism of progerin-induced cellular senescence, involving the role and interaction of mechanical sensors RhoA and Sun1/2 in regulating F-actin cytoskeleton stiffness, nuclear blebbing, micronuclei formation, and the innate immune response. We observed that increased cytoskeletal stiffness and RhoA activation in progeria cells were directly coupled with increased nuclear blebbing, Sun2 expression, and micronuclei-induced cGAS-Sting activation, part of the innate immune response. Expression of constitutively active RhoA promoted, while the inhibition of RhoA/ROCK reduced cytoskeletal stiffness, Sun2 expression, the innate immune response, and cellular senescence. Silencing of Sun2 expression by siRNA also repressed RhoA activation, cytoskeletal stiffness and cellular senescence. Treatment of Zmpste24−/− mice with a RhoA inhibitor repressed cellular senescence and improved muscle regeneration. These results reveal novel mechanical roles and correlation of cytoskeletal/nuclear stiffness, RhoA, Sun2, and the innate immune response in promoting aging and cellular senescence in HGPS progeria.
KW - accelerated aging
KW - cell nucleus
KW - cellular senescence
KW - skeletal muscle
KW - stem cells
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U2 - 10.1111/acel.13152
DO - 10.1111/acel.13152
M3 - Article
C2 - 32710480
AN - SCOPUS:85088397808
VL - 19
JO - Aging Cell
JF - Aging Cell
SN - 1474-9718
IS - 8
M1 - e13152
ER -