Related Experiment Video
Updated: May 25, 2026
07:18
Intracellular Refolding Assay
Published on: January 24, 2012
The link between small heat shock proteins and the immune system
Johannes M van Noort1, Malika Bsibsi, Peter Nacken
1Delta Crystallon BV, Leiden, The Netherlands. hans@deltacrystallon.com
The International Journal of Biochemistry & Cell Biology
|January 12, 2012
Summary
Small heat shock proteins (HSP) can be secreted by cells to support others or activate macrophages, suppressing inflammation. Alpha B-crystallin uniquely triggers detrimental adaptive immunity, contributing to multiple sclerosis.
Area of Science:
- Cellular biology
- Immunology
- Biochemistry
Background:
- Small heat shock proteins (HSP) are increasingly recognized for their extracellular functions.
- Cell-secreted HSP can act as signaling molecules and immune modulators.
Purpose of the Study:
- To explore the dual role of extracellular small HSP in cellular support and immune regulation.
- To investigate the specific immunomodulatory effects of small HSP on macrophages.
- To examine the unique pathological role of alpha B-crystallin in human inflammatory diseases.
Main Methods:
- Review of existing literature on small HSP secretion and function.
- Analysis of the mechanisms by which extracellular HSP interact with immune cells.
- Case study focusing on alpha B-crystallin and its role in multiple sclerosis.
Main Results:
- Extracellular small HSP activate macrophages, inducing an anti-inflammatory state.
- This activation suggests therapeutic potential for small HSP in inflammatory conditions.
- Alpha B-crystallin presents a unique case where adaptive immunity to the protein can override protective innate responses.
Conclusions:
- Small HSP are potent regulators of innate immunity with therapeutic promise for inflammatory disorders.
- Alpha B-crystallin's interaction with the immune system is distinct and implicated in the pathogenesis of multiple sclerosis in humans.
- Understanding these differential effects is crucial for developing targeted therapies.
Related Concept Videos
01:30Other Stress Responses in Bacteria
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
01:26Bacterial Protein Maturation
Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
02:45Responses to Heat and Cold Stress
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
01:31Regulation of the Unfolded Protein Response
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
03:00Molecular Chaperones and Protein Folding
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...
03:00Molecular Chaperones and Protein Folding
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...