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Related Concept Videos

Drug Binding to Blood Components01:30

Drug Binding to Blood Components

When drugs enter systemic circulation, they interact with various components of the blood, including proteins such as human serum albumin (HSA), α1-acid glycoprotein (AAG), lipoproteins, globulins, and red blood cells (RBCs).
HSA is the most abundant plasma protein and is vital in drug binding. It contains distinct drug-binding sites, with different drugs exhibiting affinity for specific sites. There are three main drug-binding domains for HSA: sites I, II, and III. These domains are further...
Blood Transfusion01:15

Blood Transfusion

Blood transfusion is a critical medical procedure that saves lives and treats various medical conditions. It involves transferring blood from a donor to a recipient. This process requires a thorough understanding of the ABO blood group system and its associated antigens and antibodies.
Blood Transfusion Overview
A blood transfusion is a medical procedure used to replace blood lost due to injury, surgery, or to treat conditions such as anemia or cancer. During a transfusion, donor blood is...
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...
Hypersensitivity Reactions: Cytolytic Reactions01:01

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...
Drug Distribution: Plasma Protein Binding01:29

Drug Distribution: Plasma Protein Binding

Drugs predominantly attach to plasma proteins, with only a small percentage remaining unbound. The unbound portion can be calculated as one minus the bound fraction. Acidic drugs form large, inactive complexes by reversibly binding to plasma albumin, which prevents them from diffusing across biological barriers. These drug-protein complexes act as reservoirs for the drugs. As the concentration of unbound drugs decreases, these complexes quickly dissociate to release the free drug, maintaining...
Factors Affecting Protein-Drug Binding: Protein-Related Factors01:20

Factors Affecting Protein-Drug Binding: Protein-Related Factors

Drug binding to proteins is a key aspect of pharmacokinetics and can influence a drug's distribution, absorption, and elimination in the body. Several factors, including the drug's physiochemical properties, protein concentration, disease states, and the number of binding sites on the protein, influence this process.
The physicochemical properties of a drug play a significant role in its ability to bind to proteins. Lipophilic drugs, which dissolve in fats, oils, and lipids, can be bound by...

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Related Experiment Video

Updated: Jun 4, 2026

Antigens Protected Functional Red Blood Cells By The Membrane Grafting Of Compact Hyperbranched Polyglycerols
11:31

Antigens Protected Functional Red Blood Cells By The Membrane Grafting Of Compact Hyperbranched Polyglycerols

Published on: January 2, 2013

Blood protein-polymer adsorption: implications for understanding complement-mediated hemoincompatibility.

Anna E Engberg1, Jenny P Rosengren-Holmberg, Hui Chen

  • 1School of Natural Sciences, Linnaeus University, Kalmar SE-391 82, Sweden.

Journal of Biomedical Materials Research. Part A
|February 15, 2011
PubMed
Summary

Researchers developed novel polymeric materials to understand complement activation. Complement-resistant surfaces are hydrophobic, uncharged, and possess limited surface area, potentially enhanced by specific protein adsorption.

Keywords:
biomaterialscomplementplasma protein adsorption hemocompatibilitypolymers

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Last Updated: Jun 4, 2026

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10:15

The Use of the Ex Vivo Chandler Loop Apparatus to Assess the Biocompatibility of Modified Polymeric Blood Conduits

Published on: August 20, 2014

Area of Science:

  • Materials Science
  • Biotechnology
  • Immunology

Background:

  • Complement activation on material surfaces is a key factor in biological responses.
  • Understanding the surface properties that influence complement activation is crucial for designing biocompatible materials.

Purpose of the Study:

  • To synthesize and characterize polymeric materials to investigate the preconditions for complement activation.
  • To establish a high-throughput method for creating novel substances and analyzing their properties.

Main Methods:

  • Screening of 22 polymers for complement activating capacity.
  • Physico-chemical characterization of six selected polymers (P1-P6), including composition, surface area, pore size, and protein adsorption from human plasma.
  • Analysis of protein adsorption patterns, including immunoglobulins, complement factors, and apolipoproteins.

Main Results:

  • Hydrophobic, uncharged polymers with limited accessible surface area (small pores) showed poor complement activation.
  • Surface charge and protein adsorption significantly influenced complement activation; P3 showed higher activation than P1 due to C1-inhibitor binding.
  • Selective adsorption of apolipoproteins AI and AIV on hydrophobic polymers limited complement activator binding.

Conclusions:

  • A complement-resistant surface should ideally be hydrophobic, uncharged, and possess a small available surface area, achievable through nanostructured topography.
  • Selective adsorption of inert proteins and inhibitors can further attenuate complement activation on material surfaces.