title: Presence and some characteristics of peroxisomes in immortalized human trophoblast cells.
abstract: Using morphological and biochemical (Western blot and cell fractionation) methods, we investigated whether peroxisomes are present in human extravillous trophoblast cells. Immortalized extravillous trophoblast cells (TCL-1) were incubated in the presence or absence of 0.5 mM clofibric acid for 3 d. In immunofluorescence staining of trophoblast cells with antibodies anti-catalase and anti-acyl-CoA oxidase (marker enzymes of peroxisomes), electron microscopy and immunoelectron microscopy, peroxisomes were detected in the cells. The size and number of peroxisomes in the trophoblast cells were smaller than those in rat liver. The number of peroxisomes was increased by clofibric acid. In Western blot experiment with antibodies anti-peroxisomal enzymes of beta-oxidation system, densitometric analysis revealed approximately two fold increase in staining by clofibric acid. When we performed cell fractionation experiment using catalase as one of the peroxisomal marker enzymes, the highest activity of catalase was found in the light mitochondrial fraction. Specific activity of catalase in the light mitochondrial fraction was significantly increased to about 1.3 times higher than the control value by clofibric acid treatment. Upon Nycodenz density gradient centrifugation, the catalase activity was concentrated in the density fraction around 1.14-1.15. These findings suggest that microperoxisomes, which have a density smaller than those of rat hepatic peroxisomes, do exist in human extravillous trophoblast cells. It may also be possible to proliferate human peroxisomes in limited quantities using peroxisome proliferator of rodents.
authors: Faculty of Pharmaceutical Sciences, Josai University; Keyakidai, Sakado, Saitama 350-0295, Japan. hasimoto@josai.ac.jp
authors: Fumie
authors: F
authors: Hashimoto
authors: Shigeta
authors: S
authors: Shimooka
authors: Kaori
authors: K
authors: Iwasaki
authors: Asuka
authors: A
authors: Ono
authors: Maiko
authors: M
authors: Kumaoka
authors: Sadaki
authors: S
authors: Yokota
authors: Satoru
authors: S
authors: Takeda
authors: Masaki
authors: M
authors: Okawara
authors: Hidenori
authors: H
authors: Hayashi
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D015153:Blotting, Western; D002374:Catalase / Q000378:metabolism; D002458:Cell Fractionation; D002460:Cell Line; D002499:Centrifugation, Density Gradient; D002995:Clofibric Acid / Q000494:pharmacology; D003720:Densitometry; D005455:Fluorescent Antibody Technique; D006801:Humans; D000960:Hypolipidemic Agents / Q000494:pharmacology; D008854:Microscopy, Electron; D020675:Peroxisomes / Q000201:enzymology / Q000378:metabolism / Q000648:ultrastructure*; D014327:Trophoblasts / Q000201:enzymology / Q000378:metabolism / Q000648:ultrastructure*
chemical_list: D000960:Hypolipidemic Agents; D002995:Clofibric Acid; D002374:Catalase; D000135:Acid Phosphatase