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Inflammatory signaling networks between tumor cells and immune cells contribute to the development of malignant pleural effusion (MPE). B cells have been found in MPE; however, little is known about their roles there. In the present study, by using mouse MPE models, we noted that although the total B cells in MPE were decreased as compared with the corresponding blood and spleen, the percentage of activated naïve B cells expressing higher levels of CD80, CD86, myosin heavy chain-II, CD44, CD69, and programmed cell death-ligand 1 (PD-L1) molecules were increased in wild-type mouse MPE. Compared with wild-type mice, decreased T helper (T H )1 cells and increased T H 17 cells were present in B cell-deficient mouse MPE, which paralleled to the reduced MPE volume and longer survival time. Adoptive transfer of activated naïve B cells into B cell-deficient mice was able to increase T H 1 cells and decrease T H 17 cells in MPE and shorten the survival of mice bearing MPE. Furthermore, we demonstrated that activated naïve B cells inhibited T H 17-cell expansion via the PD-1/PD-L1 pathway and promoted naïve CD4 +  T-cell differentiation into T H 1/T H 17 cells through secreting IL-27/IL-6 independent of the PD-1/PD-L1 pathway. Collectively, our data uncovered a mechanism by which naïve B cells promote MPE formation by regulating T H 1/T H 17 cell responses, making these B cells an attractive target for therapeutic intervention in the fight against cancer.

Activated naïve B cells promote development of malignant pleural effusion by differential regulation of TH1 and TH17 response

Activated naïve B cells promote development of malignant pleural effusion by differential regulation of T_H1 and T_H17 response