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. 1990 Oct;82(1):133–139. doi: 10.1111/j.1365-2249.1990.tb05416.x

In vitro production of B cell growth factor and B cell differentiation factor by peripheral blood mononuclear cells and bronchoalveolar lavage T lymphocytes from patients with idiopathic pulmonary fibrosis.

M Emura 1, S Nagai 1, M Takeuchi 1, M Kitaichi 1, T Izumi 1
PMCID: PMC1535146  PMID: 2208788

Abstract

The activation of B lymphocytes and formation of immune complexes have been suggested to play an important role in the pathogenesis of idiopathic pulmonary fibrosis (IPF). To investigate the mechanisms of activation of B lymphocytes, we studied the production of B cell growth factor (BCGF) and B cell differentiation factor (BCDF) in patients with IPF and those with interstitial pneumonia associated with collagen vascular diseases (IP-CVD), in comparison with healthy controls. Culture supernatants of peripheral blood mononuclear cells from patients with IPF induced more IgM and IgA production by B lymphocytes than those from healthy controls, indicating a higher production of BCDF in the patients. Culture supernatants of T lymphocytes obtained from bronchoalveolar lavage fluids (BALF) of patients with IPF induced higher proliferation of B lymphocytes than those from healthy controls, indicating a higher production of BCGF. An increase in production of BCGF and BCDF was not observed in patients with IP-CVD. In the light of these results, it was suggested that there may be an imbalance in T lymphocyte subsets that release lymphokines like BCGF and BCDF in patients with IPF, and that the subsets may differ between blood and BALF. It remains to be elucidated whether the activation of B lymphocytes depending on T lymphocytes determines the development of disease in IPF.

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Selected References

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