Figure 7.

Responses of intracellular Ca²⁺ and IL-8 to M-CSE and Non-M-CSE in HEK293 cells transfected with human TRPM8 (hTRPM8). (A) Cells were transfected with control (pCMV6) or Flag-tagged hTRPM8 vector for 24 h. Anti-Flag and anti-TRPM8 antibodies were used to perform Western blot to confirm successful transfection. (B) Control cells or hTRPM8-expressing cells were exposed to 1% Non-M-CSE or M-CSE for 1, 2, 5, 10, and 30 min. Intracellular Ca²⁺ levels were measured by Fluo-8 fluorescent probe assay. The hTRPM8-expressing cells were exposed to medium alone, 1% Non-M-CSE, 1% M-CSE, or menthol for 2 min (C) and 24 h (D) with or without pretreatment with AMTB. IL-8 levels were analyzed by ELISA. Data from each group are means ± SEM from four independent experiments. ^*p < 0.05 vs. the control vector group (B) or medium group (C,D); ^@p < 0.05 vs. the Non-M-CSE group without pretreatment (B–D); #p < 0.05 vs. the same type of CSE group without pretreatment (C,D).