title: Tissue origin of serum placental-like alkaline phosphatase in cigarette smokers.
abstract: A variety of solubilised tissue extracts from cigarette smokers and non-smokers have been screened quantitatively for both placental alkaline phosphatase (PLAP) and placental-like alkaline phosphatase (PLAP-like AP) in order to identify the possible tissue origins of the circulating PLAP-like AP found in most smokers. Lung alveolar tissue, and to a lesser extent colonic tissues, contained both PLAP-like AP and PLAP. Tissues from smokers and non-smokers contained comparable proportions and amounts of PLAP and PLAP-like AP. No other tissue source of PLAP-like AP was found other than those previously reported for testicular, endometrial and thymic tissue. Selective release of PLAP-like AP from the lung in cigarette smokers seems likely to be a major source for this isoenzyme in peripheral circulation.
mesh_terms: D000469:Alkaline Phosphatase; D000911:Antibodies, Monoclonal; D003106:Colon / Q000201:enzymology*; D058851:GPI-Linked Proteins; D006801:Humans; D007124:Immunoenzyme Techniques; D007527:Isoenzymes / Q000097:blood*; D011650:Pulmonary Alveoli / Q000201:enzymology*; D012907:Smoking
chemical_list: D000911:Antibodies, Monoclonal; D058851:GPI-Linked Proteins; D007527:Isoenzymes; D000469:Alkaline Phosphatase; C019839:alkaline phosphatase, placental