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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...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
Matrix Proteoglycans and Glycoproteins01:21

Matrix Proteoglycans and Glycoproteins

Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
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...

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Related Experiment Video

Updated: May 9, 2026

Bacterial Expression and Purification of Human Matrix Metalloproteinase-3 using Affinity Chromatography
07:32

Bacterial Expression and Purification of Human Matrix Metalloproteinase-3 using Affinity Chromatography

Published on: March 30, 2022

Platelets and matrix metalloproteinases.

P Seizer1, A E May

  • 1Peter Seizer, Medizinische Klinik III, Universitätsklinikum Tübingen, Otfried Müller-Str.10, 72076 Tübingen, Germany, Tel.: +49 7071 29 83160; Fax: +49 7071 29 4473,

Thrombosis and Haemostasis
|July 19, 2013
PubMed
Summary
This summary is machine-generated.

Platelets significantly influence disease by regulating matrix metalloproteinases (MMPs) and their inhibitors. This review explores platelet-derived and induced MMPs in various pathophysiologies.

Keywords:
EMMPRINMMPPlatelets

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pathophysiology

Background:

  • Matrix metalloproteinases (MMPs) and their inhibitors are crucial in disease processes like inflammation and tissue degradation.
  • Platelets play a significant role in modulating MMP activity within these pathophysiologies.

Purpose of the Study:

  • This review focuses on the multifaceted roles of platelet-associated matrix metalloproteinases (MMPs) and their inhibitors.
  • To elucidate the mechanisms by which platelets influence MMP activity and contribute to disease.

Main Methods:

  • Literature review of studies investigating MMPs and platelets in various pathological conditions.
  • Analysis of mechanisms including leukocyte recruitment, paracrine signaling, and direct synthesis of MMPs by platelets.

Main Results:

  • Platelets concentrate leukocyte-derived MMPs at injury sites.
  • Platelets stimulate MMP production in other cells via receptor interactions and paracrine signaling.
  • Platelets synthesize and secrete MMP-1, MMP-2, MMP-3, MMP-14, and potentially MMP-9, along with tissue inhibitors of metalloproteinase (TIMPs).

Conclusions:

  • Platelet-derived and platelet-induced MMPs are key players in diverse pathophysiologies.
  • Understanding these platelet-MMP interactions is vital for developing therapeutic strategies targeting vascular injury, inflammation, and cancer.