Abstract
P-glycoprotein, a transmembrane protein associated with multidrug resistance in cancer cells, is also expressed in normal tissues. To get more insight into the physiologic role of mdr1/P-glycoprotein, we investigated its expression in human fetal tissues after 7 to 38 weeks of gestation by an immunohistochemical technique, using three different monoclonal antibodies, and by a sensitive RNAse protection assay. Expression of mdr1-mRNA could already be demonstrated in the embryonal phase of human development, after 7 weeks of gestation. Comparing the adult with the fetal tissue distribution, differences were found in specific organs, such as adrenal, intestine, respiratory epithelium, and brain capillaries. In the fetal zone cells of the fetal adrenal cortex no staining was observed by immunohistochemistry, whereas the definitive zone showed increasing expression throughout gestation. Prenatal intestine did not show staining of the epithelium, although definite mdr1-mRNA expression was observed in late specimens. Interestingly, respiratory epithelium of main bronchi and pharynx, not expressing P-gp in adults, did stain positive. Expression of P-gp in brain capillaries was not observed before the third trimester of pregnancy, whereas in kidney and liver, mdr1-mRNA expression and staining for P-glycoprotein were detected in early fetal life (11 to 14 weeks). These findings suggest a pivotal role of P-glycoprotein in physiology of various organs already in early phases of human development and may help to identify its physiologic substrates.
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