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Gene expression of TGF-β (a); IL-6 (b); and TNF-α (c) in human oral fibroblasts. Relative mRNA levels were analyzed by real-time quantitative RT-PCR for IL-6, TGF-β and TNF-α in FB after 6, 12 and 24 h on cell cultures (n = 4). Data are expressed as mean ± SD. †: difference between non-stimulated and stimulated cells, p < 0.05; *: difference between stimulated cells with or without PGA-α-MSH, p < 0.05.
