title: Changes with time in Langerhans cell number, ATPase reactivity and morphology in murine epidermis after exposure to UVB.
abstract: Effects on Langerhans cells of a single 200 mJ/cm2 dose of 284-316 nm UVB were studied in the dorsal epidermis of CBA/H mice. ATPase-positive cells were counted using light microscopy and compared with numbers of cells containing Birbeck granules. In interfollicular epidermis from untreated mice 633 +/- 20 (mean +/- S.E., n = 30) ATPase-positive cells/mm2 were found. By 3 days after UVB treatment, the number of ATPase-positive cells decreased by 90%, whilst the Birbeck granule-containing cell population was only reduced by 40% and very few cells had ultrastructural damage, suggesting that many Langerhans cells lost ATPase marker but remained intact. 7 d after irradiation there were 50% more cells with Birbeck granules than in controls, but the number of cells bearing ATPase remained below normal. ATPase-positive cell numbers approached normal only after a further 2-3 weeks. Langerhans cell responses after UVB differed from those previously found after X-irradiation.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D002452:Cell Count; D000078404:Epidermal Cells; D004817:Epidermis / Q000528:radiation effects* / Q000648:ultrastructure; D005260:Female; D007801:Langerhans Cells / Q000201:enzymology* / Q000528:radiation effects / Q000648:ultrastructure; D051379:Mice; D008808:Mice, Inbred CBA / Q000145:classification; D008854:Microscopy, Electron; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D000251:Adenosine Triphosphatases