(Hypertension. 1995;26:432-435.)
© 1995 American Heart Association, Inc.
Articles |
Enhanced Immunoglobulin Formation of Immortalized B Cells From Hypertensive Patients
From the Institut für Pharmakologie and Abteilung für Hämatologie (J.H.), Universitätsklinikum Essen (Germany).
Abstract Increased immunoglobulin levels and leukocyte counts have frequently been reported in essential hypertension. The underlying mechanisms, however, have remained obscure. Enhanced Na+-H+ exchanger activity is another frequently observed abnormality in essential hypertension that persists in immortalized B lymphoblasts and coincides with enhanced proliferation. We investigated the capacity of B lymphoblasts from essential hypertensive patients to synthesize and secrete immunoglobulins. Six B cell lines from essential hypertensive patients with enhanced Na+-H+ exchanger phenotype and six cell lines from normotensive subjects were studied. Lymphocyte markers were visualized by immunostaining. Immunoglobulin secretion was analyzed by enzyme-linked immunosorbent assay. These cell lines did not differ with respect to B cell markers. In response to 100 nmol/L platelet-activating factor, cells from hypertensive patients proliferated distinctly more quickly and their cell number increased by 3.9±0.4-fold (mean±SD) within 4 days, whereas the number of cells from normotensive subjects increased by only 2.6±0.1-fold. Furthermore, platelet-activating factor induced average increases in IgM and IgG formation of 13.3- and 5.4-fold, respectively, in lymphoblasts from hypertensive patients, which was significantly higher than increases in cells from normotensive subjects (1.4- and 1.2-fold, respectively). Thus, lymphoblasts from hypertensive patients proliferate more quickly and secrete more immunoglobulins in response to a physiological stimulus in vitro. This may contribute to the raised immunoglobulin levels and leukocyte counts reported in vivo.
Key Words: sodium-hydrogen antiporter • B lymphocyte • immunoglobulins • platelet activation • signal transduction
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