Fig. 3.PlGF enhanced hair shaft elongation in ex vivo hair organ culture. (A and B)hHFs were treated with 10 or 50 ng/mL PlGF and 1 mM minoxidil (MNX, positive control) for8
days (n = 3). HF elongation was measured directly at 4 and 8 days of culture using a stereo microscope. (C) 5-mm frozen sections of hHFs from 3 different individuals were
analyzed for proliferation (Ki67-positive, red fluorescence) in keratinocytes of the hair
bulb. Nuclei were counterstained with DAPI (blue fluorescence). For quantitative analyses, the number of Ki67-positive cells was counted and normalized to the number of
DAPI-stained cells. (D and E) hHFs were treated with 500 or 1000 ng/mL anti-Flt1 neutralizing antibody and 1 mM MNX for 6 days (n = 4). HF elongation was measured directly at 3 and 6 days of culture using a stereo microscope. Results are expressed as themean SE. *P < 0.05 versus the control. Numbers next to the lines are percentage ratios compared to the control. Scale bar = 100 mm; original magnification, 200.