Expression and activities of N-myristoyltransferase and calcineurin in normal and inflamed lungs.
The role of N-myristoyltransferase and calcineurin is well established in signaling pathways. However, there are no data on their expression and activities in normal and inflamed lungs. The mechanisms of lung inflammation induced following administration of lipopolysaccharides (LPS) or exposure to swine barn air remain unclear. Therefore, we examined expression and activities of N-myristoyltransferase and calcineurin in normal and inflamed lungs of rats. Histopathology showed acute inflammation in the lungs of rats exposed to barn air or LPS but not of control rats. There was no difference in the activities of N-myristoyltransferase and calcineurin among the control, barn-exposed, and LPS-treated rat lungs. Although N-myristoyltransferase and calcineurin were localized in airway epithelium, blood vessel walls, alveolar macrophages, and septa in the lungs of rats from all the groups, the staining intensity was increased in the lungs from rats exposed to intravenous LPS or barn air. Densitometric analyses of Western blots of 55- and 60-kDa polypeptide bands corresponding to N-myristoyltransferase and calcineurin, respectively, in the lung homogenates revealed no differences among the groups. These results show that expression of myristoyltransferase and calcineurin in lung epithelium and endothelium and a cell-specific increase in immunohistochemical expression.
Charavaryamath
Chandrashekhar
C
Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon, Canada.
Lemieux
Hollie
H
Singh Suri
Sarabjeet
S
Selvakumar
Ponniah
P
Sharma
Rajendra K
RK
Singh
Baljit
B
D000217:Acyltransferases / Q000032:analysis* / Q000235:genetics / Q000378:metabolism; D000818:Animals; D019703:Calcineurin / Q000032:analysis* / Q000235:genetics / Q000378:metabolism; D004727:Endothelium / Q000737:chemistry; D004848:Epithelium / Q000737:chemistry; D007150:Immunohistochemistry; D008070:Lipopolysaccharides / Q000494:pharmacology; D011014:Pneumonia / Q000201:enzymology / Q000378:metabolism*; D051381:Rats; D014018:Tissue Distribution; D015854:Up-Regulation
D008070:Lipopolysaccharides; D000217:Acyltransferases; C050480:glycylpeptide N-tetradecanoyltransferase; D019703:Calcineurin