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A Novel Role for Caveolin-1 in B Lymphocyte Function and the Development of Thymus-Independent Immune Responses
Freddy A. Medina, Terence M. Williams, Federica Sotgia, Herbert B. Tanowitz and Michael P. Lisanti
volume 5 | issue 16
15 august 2006Pages: 1865 - 1871
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Caveolin-1 (Cav-1) functions as a scaffold or platform for many molecules involved in signal transduction. However, the expression and function of Cav-1 in the immune system has been controversial. Here, we show that Cav-1 mRNA and protein is indeed expressed in murine B-lymphocytes in a regulated manner. Cav-1 deficient mice displayed reduced levels of antibody in their serum. In order to examine the role of Cav-1 in the development of immunoglobulin-mediated immune responses, we immunized wild-type and Cav-1 deficient mice with thymus-dependent and thymus independent antigens. Our results show that Cav-1 deficient mice have a normal response to thymus-dependent antigens, but have a reduced response to both type I and type II thymus independent antigens. However, lymphocyte populations in the spleen and peritoneum were not altered and no changes were observed in splenic architecture. Caveolin-1 deficient B-lymphocytes did not display altered proliferation in response to different stimuli. However, we found that Cav-1 deficient B cells have reduced IgG3 secretion in vitro in response to LPS. Finally, we also demonstrate that human plasma cells (mature B lymphocytes) express Cav-1 in vivo. Taken, together these results provide convincing evidence for expression of Cav-1 in activated B-lymphocytes and demonstrate a role for Cav-1 in the development of thymus-independent immune responses.
We now provide open access to journal articles published online for one year or more. This article may be downloaded at the following link:
Download PDF If the document does not open, please right-click on the link (control-click on a Macintosh) and select the option to save the file to disk.