Abstract | OBJECTIVE: METHODS: Cultured HPASMCs in normoxia or hypoxia conditions were divided into three groups and stimulated with or without phorbol 12-myristate 13-acetate (PMA) and pyrrolidine dithiocarbamate ( PDTC) in vitro. The three groups were the control group, the PMA group and the PMA + PDTC group. Reverse transcriptase-polymerase chain reaction (RT-PCR) was used to detect VEGF mRNA expression, and the expression of VEGF protein and the inhibitor protein IkappaBalpha were observed by Western blot, while the location and expression of NF-kappaB p65 were observed by immunocytochemical staining, and cell cycle phases were analyzed by flow cytometry. RESULTS: (1) As for the positive rate of nucleolar staining for NF-kappaB p65, the relative expression of IkappaBalpha protein, and the percentage of G(2)/M phases of cell cycle, there were significant differences between the PMA group and the control group or PMA + PDTC group, both in normoxia and hypoxia conditions (P < 0.05, respectively), and there was also a significant difference between the normoxia and hypoxia PMA groups (P < 0.05). (2) There were no significant differences in VEGF mRNA and protein expression among the three groups (P > 0.05, respectively) in normoxia, but the expression was higher in hypoxia PMA group than in hypoxia control and hypoxia PMA + PDTC or normoxia PMA group (P < 0.05, respectively). (3) There was a positive correlation between the positive rate of nucleolar staining for NF-kappaB p65, the relative expression of VEGF protein and the percentage of G(2)/M phases of cell cycle in hypoxia PMA group (r = 0.587 - 0.710, P < 0.05, respectively). CONCLUSIONS: There is a signal transduction pathway of PKC- NF-kappaB in HPASMCs. The activity of PKC can be enhanced in hypoxia, concomitant NF-kappaB activation or VEGF overexpression to be involved in the proliferation. These results suggest that the activation of NF-kappaB can be considered as a downstream of PKC signal transduction pathway, and the activation of PKC- NF-kappaB signal transduction pathway and VEGF overexpression may contribute to the process of hypoxic pulmonary hypertension.
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Authors | Huan-ping Zhang, Yong-jian Xu, Zhen-xiang Zhang, Wang Ni, Shi-xin Chen |
Journal | Zhonghua jie he he hu xi za zhi = Zhonghua jiehe he huxi zazhi = Chinese journal of tuberculosis and respiratory diseases
(Zhonghua Jie He He Hu Xi Za Zhi)
Vol. 27
Issue 4
Pg. 218-23
(Apr 2004)
ISSN: 1001-0939 [Print] China |
PMID | 15144607
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- I-kappa B Proteins
- NF-kappa B
- NFKBIA protein, human
- RNA, Messenger
- Thiocarbamates
- Vascular Endothelial Growth Factor A
- prolinedithiocarbamate
- NF-KappaB Inhibitor alpha
- Proline
- Protein Kinase C
- Tetradecanoylphorbol Acetate
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Topics |
- Cell Cycle
(drug effects)
- Cell Division
(drug effects)
- Cell Hypoxia
- Cells, Cultured
- Humans
- I-kappa B Proteins
(metabolism)
- Muscle, Smooth, Vascular
(cytology)
- Myocytes, Smooth Muscle
(cytology, metabolism)
- NF-KappaB Inhibitor alpha
- NF-kappa B
(metabolism)
- Proline
(analogs & derivatives, pharmacology)
- Protein Kinase C
(metabolism)
- Pulmonary Artery
(cytology)
- RNA, Messenger
(genetics)
- Signal Transduction
- Tetradecanoylphorbol Acetate
(pharmacology)
- Thiocarbamates
(pharmacology)
- Vascular Endothelial Growth Factor A
(biosynthesis, genetics)
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