Loss of MT 1‐MMP causes cell senescence and nuclear defects which can be reversed by retinoic acid

A Gutiérrez‐Fernández, C Soria‐Valles… - The EMBO …, 2015 - embopress.org
A Gutiérrez‐Fernández, C Soria‐Valles, FG Osorio, J Gutiérrez‐Abril, C Garabaya, A Aguirre…
The EMBO journal, 2015embopress.org
Abstract MT 1‐MMP (MMP 14) is a collagenolytic enzyme located at the cell surface and
implicated in extracellular matrix (ECM) remodeling. Mmp14−/− mice present dwarfism,
bone abnormalities, and premature death. We demonstrate herein that the loss of MT 1‐
MMP also causes cardiac defects and severe metabolic changes, and alters the
cytoskeleton and the nuclear lamina structure. Moreover, the absence of MT 1‐MMP induces
a senescent phenotype characterized by up‐regulation of p16 INK 4a and p21 CIP 1/WAF 1 …
Abstract
MT1‐MMP (MMP14) is a collagenolytic enzyme located at the cell surface and implicated in extracellular matrix (ECM) remodeling. Mmp14−/− mice present dwarfism, bone abnormalities, and premature death. We demonstrate herein that the loss of MT1‐MMP also causes cardiac defects and severe metabolic changes, and alters the cytoskeleton and the nuclear lamina structure. Moreover, the absence of MT1‐MMP induces a senescent phenotype characterized by up‐regulation of p16INK4a and p21CIP1/WAF1, increased activity of senescence‐associated β‐galactosidase, generation of a senescence‐associated secretory phenotype, and somatotroph axis alterations. Consistent with the role of retinoic acid signaling in nuclear lamina stabilization, treatment of Mmp14−/− mice with all‐trans retinoic acid reversed the nuclear lamina alterations, partially rescued the cell senescence phenotypes, ameliorated the pathological defects in bone, skin, and heart, and extended their life span. These results demonstrate that nuclear architecture and cell senescence can be modulated by a membrane protease, in a process involving the ECM as a key regulator of nuclear stiffness under cell stress conditions.
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