IL6 and Lassa fever: To ascertain the important role of IL-6 in the leptin-induced fibrosis and hypertrophy of LF, we added some inhibitors of IL-6 (Tocilizumab, 3 and 10 μg/ml respectively) in vitro experiment and elucidated whether the inhibitor neutralized the effect of leptin on expression of collagens in LF cells.