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pubmed-article:10639423pubmed:abstractTextCowdria ruminantium is an obligate intracellular pathogen that causes heartwater in ruminants. Several findings suggest that T cells play an important role in protection against the disease. In order to identify which proteins are involved in T-cell immunity, C. ruminantium proteins were fractionated by continuous-flow electrophoresis and tested for their ability to stimulate lymphocyte proliferation in vitro. C. ruminantium-infected endothelial cell lysates were fractionated at between 11 and 38 kDa and 50 and 168 kDa on 15 and 7% acrylamide gels, respectively. In an attempt to stimulate the natural infective process, peripheral blood mononuclear cells (PBMC) were obtained from two cattle rendered immune by infection and treatment and assayed in proliferation assays with fractionated proteins. In a parallel study, four cattle were immunized with inactivated C. ruminantium to determine whether their lymphocytes also responded to fractionated proteins. Proliferation assays after immunization by infection and treatment detected no C. ruminantium-specific proliferation in vitro after one vaccination. Proliferation was observed, however, between 1 and 4 weeks after challenge. This was followed by a period of no detectable response, after which the response reappeared. PBMC from animals immunized with inactivated organisms proliferated specifically in response to antigen soon after the first immunization. Only C. ruminantium proteins with low molecular masses of 11, 12, 14 to 17, and 19 to 23 kDa induced proliferative responses by lymphocytes from all six animals. These protein fractions may have potential as vaccine antigens.lld:pubmed
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pubmed-article:10639423pubmed:authorpubmed-author:AllsoppB ABAlld:pubmed
pubmed-article:10639423pubmed:authorpubmed-author:BrownW CWClld:pubmed
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pubmed-article:10639423pubmed:authorpubmed-author:GunterN JNJlld:pubmed
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pubmed-article:10639423pubmed:dateRevised2009-11-18lld:pubmed
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pubmed-article:10639423pubmed:articleTitleIdentification of Cowdria ruminantium antigens that stimulate proliferation of lymphocytes from cattle immunized by infection and treatment or with inactivated organisms.lld:pubmed
pubmed-article:10639423pubmed:affiliationDepartment of Immunology, Onderstepoort Veterinary Institute, Onderstepoort, Republic of South Africa. miranda@moon.ovi.ac.zalld:pubmed
pubmed-article:10639423pubmed:publicationTypeJournal Articlelld:pubmed
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