Quantitative immunocytochemical analysis of Mn SOD in alveolar type II cells of the hyperoxic rat
| Autor: | J. W. Slot, Ling-Yi Chang, James D. Crapo, Renaud Vincent |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Male
Pulmonary and Respiratory Medicine Pathology medicine.medical_specialty Physiology Immunocytochemistry Gold Colloid Rats Sprague-Dawley Superoxide dismutase Physiology (medical) Organelle medicine Animals Respiratory system Fixative Hyperoxia Lung biology Superoxide Dismutase Cell Biology Immunohistochemistry Molecular biology Mitochondria Rats Oxygen Pulmonary Alveoli Microscopy Electron medicine.anatomical_structure biology.protein Pulmonary alveolus medicine.symptom |
| Zdroj: | American Journal of Physiology-Lung Cellular and Molecular Physiology. 267:L475-L481 |
| ISSN: | 1522-1504 1040-0605 |
| DOI: | 10.1152/ajplung.1994.267.4.l475 |
| Popis: | We have analyzed the magnitude and uniformity of the expression of manganese superoxide dismutase (Mn SOD) protein in alveolar type II cells of rats exposed to hyperoxia using quantitative colloidal gold immunocytochemistry and morphometric techniques. Sprague-Dawley rats were exposed continuously to normal air or to 85% oxygen for 7 and 14 days. The lungs were fixed by intratracheal instillation of a paraformaldehyde-glutaraldehyde fixative. Lung samples were dehydrated in ethanol and embedded in LR-White. Thin sections for electron microscopy were labeled with anti-rat Mn SOD rabbit antiserum followed by protein-A gold. The labeling density (gold particles/micron 2) over subcellular compartments was determined, and relative organelle volumes were measured using a random point overlay. The results confirm that alveolar type II cells are a locus of Mn SOD response in the lungs of hyperoxic rats and contribute to this response through a combination of changes: an increase of Mn SOD concentration in the mitochondrial matrix, an increase of mitochondrial volume per cell, and type II cell hyperplasia. |
| Databáze: | OpenAIRE |
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