title: Basal lamina thickening in the placentae of smoking mothers.
abstract: The thickness of the basal lamina in the placentae of 20 matched pairs of smoking and non-smoking mothers was measured using an electron microscopic method of quantification. A significant increase of the thickness of the trophoblastic basal lamina was found in the smokers' placentae: 181 nm (s.d. +/- 38.2 nm) in non-smokers versus 286 nm (s.d. +/- 69.9 nm) in smokers (P less than 0.005). A significant increase of the thickness of the capillary basal lamina was also found: 75 nm (s.d. +/- 12.1 nm) in non-smokers versus 111 nm (s.d. +/- 16.0 nm) in smokers (P less than 0.005). The number of duplications around the capillary basal lamina was found to be increased in the placentae of smoking women.
mesh_terms: D001485:Basement Membrane / Q000648:ultrastructure; D002824:Chorionic Villi / Q000648:ultrastructure; D005260:Female; D006801:Humans; D008854:Microscopy, Electron; D010920:Placenta / Q000648:ultrastructure*; D011247:Pregnancy; D012907:Smoking