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Effect of Damiana leaves extract on mRNA levels MMP-1 and procollagen type I in UVB-irradiated HaCaT (A,B) and HDF (C,D) cells. Data are presented as the mean ± SD. # and * indicate significant differences from the non-irradiated control and UVB-treated groups, respectively. ## and ###p < 0.01 and 0.001 vs. the non-treated group, respectively. *, ** and *** p < 0.05, 0.01, and 0.001 vs. the UVB-treated control, respectively.
