PXD046001-1

PXD046001 is an original dataset announced via ProteomeXchange.

Title	Sox9 accelerates vascular ageing by regulating extracellular matrix composition and stiffness
Description	Vascular calcification and increased extracellular matrix (ECM) stiffness are hallmarks of vascular ageing. Sox9 (SRY-Box Transcription Factor 9) is a master regulator of chondrogenesis, also expressed in the vasculature, that has been implicated in vascular smooth muscle cell (VSMC) osteo-chondrogenic conversion. Here, we investigated the relationship between vascular ageing, calcification and Sox9-driven ECM regulation in VSMCs. Immunohistochemistry in human aortic samples showed that Sox9 was not spatially associated with vascular calcification but correlated with the senescence marker p16. Analysis of Sox9 expression in vitro showed it was mechanosensitive with increased expression and nuclear translocation in senescent cells and on stiff matrices. Manipulation of Sox9 via overexpression and depletion, combined with atomic force microscopy (AFM) and proteomics, revealed that Sox9 regulates ECM stiffness and organisation by orchestrating changes in collagen expression and reducing VSMC contractility, leading to the formation of an ECM that mirrored that of senescent cells. These ECM changes promoted phenotypic modulation of VSMCs whereby senescent cells plated onto ECM synthesized from cells depleted of Sox9 returned to a proliferative state, while proliferating cells on a matrix produced by Sox9 expressing cells showed reduced proliferation and increased DNA damage, reiterating features of senescent cells. Procollagen-lysine, 2-oxoglutarate 5-dioxygenase 3 (LH3) was identified as a Sox9 target, and key regulator of ECM stiffness. LH3 is packaged into extracellular vesicles (EVs) and Sox9 promoted EV secretion, leading to increased LH3 deposition within the ECM. These findings identify cellular senescence and Sox9 as a key regulators of ECM stiffness during VSMC ageing and highlight a crucial role for ECM structure and composition in regulating VSMC phenotype. We identify a positive feedback cycle whereby cellular senescence and increased ECM stiffening promote Sox9 expression which drives further ECM modifications that act to accelerate vascular stiffening and cellular senescence.
HostingRepository	PRIDE
AnnounceDate	2024-06-16
AnnouncementXML	Submission_2024-06-16_01:17:16.941.xml
DigitalObjectIdentifier	https://dx.doi.org/10.6019/PXD046001
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Supported dataset by repository
PrimarySubmitter	Steven Lynham
SpeciesList	scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationList	monohydroxylated residue; iodoacetamide derivatized residue
Instrument	Orbitrap Fusion Lumos

Revision	Datetime	Status	ChangeLog Entry
0	2023-10-09 10:13:18	ID requested
⏵ 1	2024-06-16 01:17:17	announced
2	2024-10-22 06:45:45	announced	2024-10-22: Updated project metadata.

10.1161/circresaha.123.323365;

10.6019/PXD046001;

Faleeva M, Ahmad S, Theofilatos K, Lynham S, Watson G, Whitehead M, Marhuenda E, Iskratsch T, Cox S, Shanahan CM, Sox9 Accelerates Vascular Aging by Regulating Extracellular Matrix Composition and Stiffness. Circ Res, 134(3):307-324(2024) [pubmed]

submitter keyword: Vascular Smooth Muscle Cells, Sox9, Extracellular matrix, senescence

Prof Cathy Shanahan
contact affiliation	King's College London School of Cardiovascular and Metabolic Medicine & Sciences James Black Centre 125 Coldharbour Lane, London, SE5 9NU
contact email	cathy.shanahan@kcl.ac.uk
lab head
Steven Lynham
contact affiliation	King's College London
contact email	steven.lynham@kcl.ac.uk
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD046001
     1. Label: PRIDE project
     2. Name: Sox9 accelerates vascular ageing by regulating extracellular matrix composition and stiffness