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Antigenic peptides complexed to phylogenically diverse Hsp70s induce differential immune responses
Udayasankar Kumaraguru1, C A Gouffon, R A Ivey
1Department of Microbiology, University of Tennessee, Knoxville, TN 37996, USA. udayk@utk.edu
Cell Stress & Chaperones
|November 25, 2003
Summary
Heat shock proteins (Hsps) act as immune adjuvants, enhancing responses to herpes simplex virus-1 (HSV1). However, only human Hsp70 effectively primes a protective immune response against HSV1.
Area of Science:
- Immunology
- Molecular Biology
- Protein Chemistry
Background:
- Heat shock proteins (Hsps) of the Hsp70 class play critical roles in the immune response, including cytokine production, antigen processing, and dendritic cell maturation.
- Hsps are highly conserved molecular chaperones that bind peptides in an ATP-dependent manner.
- Hsps are proposed to function as potent immune adjuvants.
Purpose of the Study:
- To compare the immune-priming and augmenting capabilities of four evolutionarily diverse Hsp70s against herpes simplex virus-1 (HSV1).
- To evaluate the adjuvant potential and antigen-presenting cell (APC) maturation effects of different Hsp70s.
- To determine if Hsp70s can induce a protective immune response against HSV1.
Main Methods:
- Comparison of four Hsp70s (E. coli DnaK, wheat Hsc70, plant CCS1, human Hsp70) for immune response modulation.
- Assessment of cytokine gene expression and APC phenotypic maturation (costimulatory molecules).
- Evaluation of cross-priming activity against HSV1, including protection from lethal challenge, in vitro proliferation, cytotoxicity, and interferon-gamma production.
Main Results:
- All four Hsp70s demonstrated significant adjuvant properties, upregulating cytokine gene expression similarly to lipopolysaccharides.
- All tested Hsp70s induced phenotypic maturation of APCs.
- Only human Hsp70 mediated effective cross-priming, leading to a protective immune response against HSV1, evidenced by survival, cellular responses, and cytokine production.
Conclusions:
- While diverse Hsp70s function as effective adjuvants and induce APC maturation, their capacity to elicit protective immunity varies significantly.
- Human Hsp70's superior ability to induce a protective immune response against HSV1 may stem from differential interactions with host co-receptors and cochaperones.
- Further research into Hsp70-cochaperone interactions could elucidate mechanisms for developing targeted immunotherapies.