Abstract
Antibodies against rabbit cytochrome P-450 reductase (reductase), cytochrome P-450 isozyme 2 (P-450 IIB), and cytochrome P-450 isozyme 5 (P-450 IVB) were used to detect homologous enzymes in the developing lung of the Syrian golden hamster. No immunocytochemical labeling was observed on gestational days 11, 12, and 13. On gestational day 14, light immunoperoxidase labeling for reductase and P-450 IIB was observed over cells lining the trachea and cranial portions of lobar bronchi. On gestational day 15, these enzymes were detected in conducting airways at all anatomic levels, and in the media of the pulmonary vein and its branches. Light labeling for P-450 IVB was first observed over cells lining the trachea and lobar bronchi on gestational day 15, but the smallest bronchioles and the media and endothelium of the pulmonary vein did not label for this enzyme until gestational day 16 (neonatal day 1). Type II pneumocytes and the pleural mesothelium first labeled for each of the three enzymes on neonatal day 1. Although the mesothelium no longer labeled for reductase or P-450 IIB in hamsters 3.5 wk old, the other labeling sites persisted in adult hamsters. Because cytochrome P-450 enzymes are associated with the endoplasmic reticu...Continue Reading
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