(a) Keratinocytes
(b) Fibroblasts
Figure 3: Differential cytokine and chemokine secretion by keratinocytes and fibroblasts in response to rhTNFα. (a) Skin compared to gingiva keratinocytes; (b) skin compared to gingiva fibroblasts. Cultures were unexposed or exposed to rhTNFα (100 and 200 IU/mL) for 24 h in the culture medium. Culture supernatants were collected and analysed by ELISA. Data represent the average of at least 3 individual experiments ± SEM; ; ; paired Student’s -test for intraskin and intragingiva comparisons, unpaired Student’s -test for skin versus gingival comparisons.