Tumor necrosis factor a and glucocorticoid synergistically increase leptin production in human adipose tissue: role for p38 mitogen-activated protein kinase - Trujillo, M E; Lee, M-J; Sullivan, S; Feng, J; Schneider, S H; Greenberg, A S; Fried, S K (J Clin Endocrinol Metab, 2006)