Aging cellOct 16, 2026

MTR4: A Key Protein Supporting Healthy Blood Vessel Lining in Young Tissue

Longevity & Aging Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Oct 22, 2026

Abstract

MTR4 protein levels decline significantly in senescent human vascular endothelial cells and aged mouse aortas.

MTR4 is identified as a novel regulator of vascular endothelial cell senescence.
The decline of MTR4 is linked to increased levels of the E3 ubiquitin ligase SYVN1, leading to MTR4's degradation.
Depleting MTR4 in proliferating human endothelial cells causes premature senescence.
Overexpressing MTR4 can restore a youthful state in senescent endothelial cells by stabilizing proteins related to cell cycle regulation.
In mice, reduced Mtr4 results in vascular dysfunction and accelerated aging, while its overexpression improves these conditions.
Mtr4 overexpression in C. elegans significantly extends lifespan, indicating its potential role in aging across species.

Simplified

Vascular endothelial cell (VEC) senescence drives organismal aging and age-related pathologies, yet the intrinsic factors preserving endothelial youthfulness remain poorly defined. Here, we identify MTR4, an evolutionarily conserved RNA helicase and nuclear RNA exosome cofactor, as a novel regulator of VEC senescence. MTR4 protein declines markedly in senescent HUVECs and aged mouse aortas, independent of general cell cycle exit. Mechanistically, senescence-induced upregulation of the E3 ubiquitin ligase synoviolin 1 (SYVN1) promotes K638-linked ubiquitination and proteasomal degradation of MTR4. MTR4 depletion drives proliferating HUVECs into premature senescence, whereas its overexpression restores a youthful phenotype in senescent cells by binding BUB3 to stabilize BUB3 and sustain BUBR1 expression. In mice, endothelial Mtr4 knockdown promotes vascular dysfunction and multi-organ aging, while endothelium-specific Mtr4 overexpression alleviates these phenotypes. In C. elegans, mtr-4 overexpression dramatically extends lifespan, comparable to classic longevity models and surpassing most single-gene interventions, while its knockdown accelerates aging. Our findings establish MTR4 as a critical guardian of endothelial homeostasis and organismal aging, with strong translational potential for mitigating age-related vascular dysfunction.

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MTR4: A Key Protein Supporting Healthy Blood Vessel Lining in Young Tissue

Abstract

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