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[Effects of conditioned medium derived from keratinocytes on fibroblasts].

OBJECTIVE
To observe the effects of keratinocytes on proliferation and collagen secretion of fibroblasts.


METHODS
The conditioned medium, collected from cultured keratinocytes, was added to the cultured fibroblasts as the tested groups (12.5%, 25% and 50% groups) and DMEM as control group. The MTT, hydroxyproline colorimetric method and flow cytometer were employed to measure the fibroblast proliferation, the collagen secretion and the change of the cell cycle.


RESULTS
In fibroblast proliferation, the absorbency(A) value of tested groups was significantly different from that of the control group (P<0.01). A value increased as increasing concentration, there was statistically significant difference between the concentrations of 25%, 50% and the concentration of 12.5% (P<0.01), but no statistically significant difference between the concentrations of 25% and 50% (P>0.01). In collagen secretion, there was no statistically significant difference between the tested groups and the control group(P>0. 01), and between the tested groups(P>0.01). In cell cycle, 50% of conditioned medium could make the fibroblast pass the limit of G1/S and S/G2 period, the cell rates of S,G2-M period increased.


CONCLUSION
The conditioned medium from keratinocytes can increase fibroblasts proliferation, have little effect on general collagen secretion.