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Effects of chronic stress on the immune response to oral human serum albumin-conjugated starch microparticles in rats
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmacy.
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2007 (English)In: Journal of Neuroimmunology, ISSN 0165-5728, E-ISSN 1872-8421, Vol. 183, no 1-2, 33-42 p.Article in journal (Refereed) Published
Abstract [en]

Uptake of antigens and bacteria over the follicle-associated epithelium (FAE) is increased after chronic psychological stress. We investigated whether stress affects the immune response to particle-conjugated antigens taken up via the FAE. Rats were submitted to two 10-day periods of water avoidance stress and orally immunized during these periods. Stressed immunized rats displayed altered cell populations and a Th1-skewed immune response within the lymphoid follicles, together with enhanced delayed-type hypersensitivity. We conclude that chronic stress affects the cell-mediated immune response after oral immunization, which may have implications for the understanding of allergic and autoimmune diseases and development of oral vaccines.

Place, publisher, year, edition, pages
2007. Vol. 183, no 1-2, 33-42 p.
Keyword [en]
Administration; Oral, Animals, Antigens; CD8/metabolism, Antigens; Differentiation/metabolism, Chronic Disease, Cytokines/metabolism, Enzyme-Linked Immunosorbent Assay/methods, Flow Cytometry/methods, Gene Expression Regulation/physiology, Humans, Hypersensitivity; Delayed/etiology/immunology, Male, Peyer's Patches/immunology/metabolism, Rats, Rats; Wistar, Serum Albumin/administration & dosage/*immunology, Starch/*administration & dosage/immunology, Stress; Psychological/*immunology/pathology, Time Factors
National Category
Medical and Health Sciences Pharmaceutical Sciences
URN: urn:nbn:se:uu:diva-92411DOI: 10.1016/j.jneuroim.2006.11.005ISI: 000244773000005OAI: oai:DiVA.org:uu-92411DiVA: diva2:165474
Available from: 2004-11-25 Created: 2004-11-25 Last updated: 2011-02-11Bibliographically approved
In thesis
1. Starch Microparticles as an Oral Vaccine Adjuvant with Emphasis on the Differentiation of the Immune Response
Open this publication in new window or tab >>Starch Microparticles as an Oral Vaccine Adjuvant with Emphasis on the Differentiation of the Immune Response
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Polyacryl starch microparticles have been developed as an oral vaccine adjuvant capable of inducing strong local and systemic immune responses in mice. In this thesis, the starch microparticles were studied in order to increase basic understanding of their function. In particular, the thesis addressed aspects of the uptake of the particles and their presentation to the immune system after different routes of administration, in correlation with the differentiation of the induced immune response.

When using human serum albumin as a model antigen conjugated to the microparticles, it was found that the route of administration and the use of different combinations of routes, parenteral or oral, affect the profile (Th1/Th2 balance) of the induced immune response. It was also found that oral boosters are needed for the development of a local s-IgA response.

Ligated mouse intestinal loops in combination with confocal laser-scanning microscopy demonstrated that the uptake of the particles by the intestinal mucosa takes place over the follicle-associated epithelium (FAE) that covers the Peyer’s patches. The particles are also taken up in the villus epithelium when conjugated with rCTB, a ligand to the GM1 receptor. This qualitative difference in uptake did not affect the induced immune response. Thus, the addition of rCTB to the microparticles did not improve or influence the profile of the immune response. Chronic stress, known to alter the barrier function of the FAE, increased the cellular response but did not affect the humoral immune response.

Despite positive results in rodents, the particles were not able to boost a humoral immune response in man when tested with diphtheria toxin-cross reacting material (CRM197). Possible methods of improving the adjuvant effect in man are discussed.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 56 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 0282-7484 ; 317
Pharmaceutics, Vaccine adjuvant, Microparticles, Oral immunisation, Th1/Th2 differentiation, Mucosal immune response, Uptake, M cell, Galenisk farmaci
National Category
Pharmaceutical Sciences
urn:nbn:se:uu:diva-4680 (URN)91-554-6101-8 (ISBN)
Public defence
2004-12-17, B42, BMC, Husargatan 3, Uppsala, 09:15
Available from: 2004-11-25 Created: 2004-11-25Bibliographically approved

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