B- and T-cell responses in group A streptococcus M-protein- or peptide-induced experimental carditis
Gorton, Davina, Govan, Brenda, Olive, Colleen, and Natkunam, Ketheesan (2009) B- and T-cell responses in group A streptococcus M-protein- or peptide-induced experimental carditis. Infection and Immunity, 77 (5). pp. 2177-2183.
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View at Publisher Website: http://dx.doi.org/10.1128/IAI.01514-08
The etiology of rheumatic fever and rheumatic heart disease (RF/RHD) is believed to be autoimmune, involving immune responses initiated between streptococcal and host tissue proteins through a molecular mimicry mechanism(s). We sought to investigate the humoral and cellular responses elicited in a Lewis rat model of group A streptococcus M-protein- or peptide-induced experimental valvulitis/carditis, a recently developed animal model which may, in part, represent human rheumatic carditis. Recombinant streptococcal M5 protein elicited opsonic antibodies in Lewis rats, and anti-M5 antisera recognized epitopes within the B- and C-repeat regions of M5. One peptide from the streptococcal M5 protein B-repeat region (M5-B.6, amino acids 161 to 180) induced lymphocytes that responded to both recombinant M5 and cardiac myosin. Rats immunized with streptococcal M5 protein developed valvular lesions, distinguished by infiltration of CD3+, CD4+, and CD68+ cells into valve tissue, consistent with human studies that suggest that RF/RHD are mediated by inflammatory CD4+ T cells and CD68+ macrophages. The current study provides additional information that supports the use of the rat autoimmune valvulitis model for investigating RF/RHD.
|Item Type:||Article (Refereed Research - C1)|
|FoR Codes:||11 MEDICAL AND HEALTH SCIENCES > 1102 Cardiovascular Medicine and Haematology > 110201 Cardiology (incl Cardiovascular Diseases) @ 50%|
11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110309 Infectious Diseases @ 50%
|SEO Codes:||92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920103 Cardiovascular System and Diseases @ 50%|
92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920109 Infectious Diseases @ 50%
|Deposited On:||30 Mar 2010 13:52|
|Last Modified:||18 Oct 2013 00:58|
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