Abstract | OBJECTIVE: To explore the possible mechanism of injury by smoking and its repairing, the effects of cigarette smoke extract on the expression of beta-catenin (beta-cat), c-Src and level of phosphoric tyrosine in airway epithelial cells (AEC). METHODS: Pig AECs were cultured in vitro. After CSE and tyrphostin 25 exposure, (1) the expression of beta-cat was determined by immunocytochemical stain in 300 randomly selected AECs of each group, (2) the level of phosphoric tyrosine, content of c-Src and beta-cat mRNA in AECs were evaluated by immunocytochemical stain, in situ hybridization and image analysis in 30 randomly selected AECs of each group. RESULTS: After exposure to CSE for 4 hours and 24 hours, the levels of phosphoric tyrosine were 1.51 and 3.44 times of that of the control groups of the same time (P < 0.0001) respectively; the ratio of positive stain of beta-cat on membrane was markedly lower than that in the control groups (78.3% vs 83.3%, 77.7% vs 81.3%, P < 0.0001), and the cytoplasmic content of c-Src decreased 47.9% and 51.4% (P < 0.0001) compared with the control groups of the same time, respectively. While dealt with CSE and tyrphostin 25 together, the level of phosphoric tyrosine, the expression of beta-cat and c-Src resembled those in normal control. Contends of beta-cat mRNA decreased in the both two situations (P < 0.0010). CONCLUSION: CSE decreased the membranous expression of beta-cat and increased the level of tyrosine phosporylation of AECs. The change of beta-cat expression might mediate the airway epithelial injuries caused by smoking, and tyrphostin 25 might prevent such injuries through inhibiting the tyrosine kinase.
|
Authors | F Chen, R Wu, X Wang |
Journal | Zhonghua yi xue za zhi
(Zhonghua Yi Xue Za Zhi)
Vol. 81
Issue 7
Pg. 406-10
(Apr 10 2001)
ISSN: 0376-2491 [Print] China |
PMID | 11798907
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
|
Chemical References |
- Cytoskeletal Proteins
- RNA, Messenger
- Smoke
- Trans-Activators
- beta Catenin
- Tyrosine
- Protein-Tyrosine Kinases
- CSK Tyrosine-Protein Kinase
- src-Family Kinases
|
Topics |
- Animals
- Bronchi
(cytology, metabolism)
- CSK Tyrosine-Protein Kinase
- Cytoskeletal Proteins
(biosynthesis, genetics)
- Epithelial Cells
(metabolism)
- Immunohistochemistry
- Phosphorylation
- Protein-Tyrosine Kinases
(analysis)
- RNA, Messenger
(analysis)
- Smoke
(adverse effects)
- Swine
- Tobacco
- Trachea
(cytology, metabolism)
- Trans-Activators
- Tyrosine
(metabolism)
- beta Catenin
- src-Family Kinases
|