Related Experiment Video

Updated: Aug 11, 2026

Characterizing Modulators of Protease-Activated Receptors with a Calcium Mobilization Assay Using a Plate Reader
07:13

Characterizing Modulators of Protease-Activated Receptors with a Calcium Mobilization Assay Using a Plate Reader

Published on: May 24, 2024

[Mechanisms of action of recombinant human activated Protein C]

M Brueckmann1, G Huhle, M Max

  • 1I Medizinische Klinik, Fakultät für Klinische Medizin, Universität Heidelberg, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim. martina.brueckmann@med.ma.uni-heidelberg.de

Der Anaesthesist
|March 8, 2006
PubMed

Insights

Human activated protein C (APC) is a vital anticoagulant with anti-inflammatory and anti-apoptotic properties. Understanding its mechanisms may expand its use beyond sepsis to other critical conditions.

Area of Science:

  • Biochemistry
  • Physiology
  • Pharmacology

Background:

  • Human activated protein C (APC) is a serine protease and a key physiological inhibitor of coagulation.
  • APC exhibits profibrinolytic, anti-inflammatory, anti-apoptotic, and immunomodulatory effects.
  • Recombinant human activated protein C (rhAPC) reduced mortality in severe sepsis patients.

Purpose of the Study:

  • To explore the multifaceted mechanisms of APC beyond its anticoagulant properties.
  • To investigate the potential of APC in treating conditions characterized by endothelial and microcirculatory dysfunction.
  • To understand how APC's anti-inflammatory and anti-apoptotic actions could broaden its therapeutic indications.

Main Methods:

  • Review of existing clinical trials and in vitro/in vivo experimental studies on APC and rhAPC.
  • Analysis of reported effects including anticoagulation, profibrinolysis, anti-inflammation, anti-apoptosis, and immunomodulation.
  • Examination of rhAPC's impact on endothelial cell permeability, survival, and microcirculation.

Main Results:

  • APC demonstrates significant anticoagulant, profibrinolytic, and anti-inflammatory activities.
  • rhAPC (drotrecogin alfa) has shown mortality benefits in severe sepsis.
  • rhAPC exhibits anti-apoptotic and immunomodulatory effects, improves endothelial cell survival, and reduces permeability.

Conclusions:

  • APC's diverse mechanisms suggest potential applications beyond sepsis, including acute organ failure and ischemic conditions.
  • Further understanding of APC's anti-inflammatory and anti-apoptotic actions is crucial for optimizing its use.
  • Broader therapeutic indications for rhAPC may be achievable with a deeper insight into its complex biological effects.

More Related Videos

Assessment of Human Natural Killer Cell Events Driven by FcγRIIIa Engagement in the Presence of Therapeutic Antibodies09:54

Assessment of Human Natural Killer Cell Events Driven by FcγRIIIa Engagement in the Presence of Therapeutic Antibodies

Published on: May 22, 2020

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation04:37

Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation

Published on: May 23, 2025

Related Concept Videos

cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
Treatment for Pulmonary Arterial Hypertension: Prostacyclin Receptor Agonists01:23

Treatment for Pulmonary Arterial Hypertension: Prostacyclin Receptor Agonists

Prostacyclin receptor agonists are a class of therapeutic agents integral to managing pulmonary arterial hypertension (PAH). These drugs operate by mimicking the action of prostaglandin I2, or PGI2, a naturally occurring compound in the body.
These agonists bind to the IPR receptor situated on the plasma membrane of the pulmonary artery smooth muscle cells. This binding triggers a cascade of reactions known as the GS-AC-cAMP-PKA pathway. This pathway results in the relaxation of smooth muscle...
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.
Complement System01:27

Complement System

The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a membrane...
Extrinsic and Intrinsic Pathways of Hemostasis01:20

Extrinsic and Intrinsic Pathways of Hemostasis

Blood clotting or coagulation involves extrinsic and intrinsic pathways, which ultimately merge into the common pathway, forming a fibrin clot.
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...