Related Experiment Video

Updated: Jun 10, 2026

Isolating Mesangiogenic Progenitor Cells (MPCs) from Human Bone Marrow
09:53

Isolating Mesangiogenic Progenitor Cells (MPCs) from Human Bone Marrow

Published on: July 15, 2016

Mesenchymal stem cells inhibit both endogenous and exogenous MMPs via secreted TIMPs

Thomas P Lozito1, Rocky S Tuan

  • 1Department of Health and Human Services, Cartilage Biology and Orthopaedics Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland, USA.

Journal of Cellular Physiology
|July 29, 2010
PubMed

Insights

Mesenchymal stem cells (MSCs) protect blood vessels by secreting inhibitors (TIMPs) that block damaging enzymes (MMPs). This matrix protection is crucial for perivascular niche stability, even under stress.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Regenerative Medicine

Background:

  • Mesenchymal stem cells (MSCs) reside in the perivascular niche, influencing vessel stability.
  • Matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) are key regulators of the extracellular matrix.
  • Understanding MSCs' role in modulating MMP/TIMP activity is crucial for perivascular niche regulation.

Purpose of the Study:

  • To investigate the contribution of MSCs to the regulation of MMPs and TIMPs in the perivascular niche.
  • To determine if MSCs can inhibit MMP activity and protect vascular structures.
  • To assess MSC matrix-protective capabilities under inflammatory and hypoxic conditions.

Main Methods:

  • Analysis of MMP and TIMP secretion in MSC-conditioned medium (MSC-CM).
  • Bifunctional-crosslinking to probe endogenous MMP:TIMP interactions.
  • Assessment of MSC-CM's protective effects on vascular matrix molecules and endothelial cells against MMPs.
  • Evaluation of MSCs' response to pro-inflammatory cytokines and hypoxia.

Main Results:

  • MSCs secrete active MMPs, but their activity is inhibited by TIMPs within MSC-CM.
  • TIMP-2 from MSCs inhibits endogenous MMP-2 and exogenous MMP-2.
  • TIMP-1 from MSCs inhibits exogenous MMP-9.
  • MSC-CM protects vascular components from MMP-induced damage.
  • MSCs enhance TIMP-1 expression and MMP inhibition under inflammatory and hypoxic stress.

Conclusions:

  • MSCs are potent sources of TIMP-mediated MMP inhibition.
  • MSCs effectively protect the perivascular niche from MMP-induced degradation.
  • MSC-mediated matrix protection is robust, even under pathological conditions like inflammation and hypoxia.

More Related Videos

Molecular Analysis of Endothelial-mesenchymal Transition Induced by Transforming Growth Factor-β Signaling07:49

Molecular Analysis of Endothelial-mesenchymal Transition Induced by Transforming Growth Factor-β Signaling

Published on: August 3, 2018

TGF-β-mediated Endothelial to Mesenchymal Transition (EndMT) and the Functional Assessment of EndMT Effectors using CRISPR/Cas9 Gene Editing07:05

TGF-β-mediated Endothelial to Mesenchymal Transition (EndMT) and the Functional Assessment of EndMT Effectors using CRISPR/Cas9 Gene Editing

Published on: February 26, 2021

Related Concept Videos

Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult body.
A...
Mesenchymal Stem Cells01:19

Mesenchymal Stem Cells

Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their access...
The Extracellular Matrix01:29

The Extracellular Matrix

Overview
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...