Role of c- fos gene in vasoactive intestinal peptide promoted synthesis of pulmonary surfactant phospholipids

• Published in: Regulatory peptides 2007-05, Vol.140 (3), p.117-124
• Main Authors: Li, Lian, She, Hua, Yue, Shao-Jie, Qin, Xiao-Qun, Guan, Cha-Xiang, Liu, Hui-Jun, Luo, Zi-Qiang
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; c-Fos protein; Cells, Cultured; Choline-Phosphate Cytidylyltransferase - antagonists & inhibitors; Choline-Phosphate Cytidylyltransferase - metabolism; Enzyme Inhibitors - pharmacology; Female; Fundamental and applied biological sciences. Psychology; Genes, fos - drug effects; Genes, fos - physiology; Immunohistochemistry; Intracellular signal transduction pathway; Male; Oligonucleotides, Antisense - pharmacology; Organ Culture Techniques; Phosphatidylcholine; Phosphatidylcholines - metabolism; Protein kinase C; Protein Kinase C - antagonists & inhibitors; Protein Kinase C - metabolism; Pulmonary Alveoli - cytology; Pulmonary Alveoli - drug effects; Pulmonary Alveoli - metabolism; Pulmonary Surfactants - metabolism; Rats; Rats, Wistar; Receptors, Vasoactive Intestinal Peptide - antagonists & inhibitors; Signal Transduction - drug effects; Signal Transduction - genetics; Vasoactive intestinal peptide; Vasoactive Intestinal Peptide - pharmacology; Vertebrates: endocrinology
• ISSN: 0167-0115; 1873-1686
• DOI: 10.1016/j.regpep.2006.11.027

We previously reported that vasoactive intestinal peptide (VIP) promoted synthesis of phosphatidylcholine (PC) in alveolar type II (ATII) cells. But the intracellular mechanism for this effect was unknown. In this work, we investigated the intracellular signal transduction pathway for VIP promoted synthesis of PC, the major lipid component of pulmonary surfactant (PS), by using an antagonist of VIP receptors, inhibitor of protein kinase C (PKC) and antisense oligonucleotides (AS-ODN) for c- fos oncogene. Our results showed that: ① [D-P-Cl-Phe(6)-Leu(17)]-VIP (10 − 6  mol/l), an antagonist of VIP receptors, could decrease the quantity of [ 3H] choline incorporation, microsomal choline-phosphate cytidylyltransferase (CCT) mRNA expression and CCT activity induced by VIP (10 − 8  mol/l) in cultured lung explants to the control levels; ② VIP (10 − 8  mol/l) upregulated c-Fos protein expression in ATII cells. AS-ODN for c- fos oncogene (9 × 10 − 6  mol/l) could block the elevation of [ 3H] choline incorporation, microsomal CCT mRNA expression and CCT activity induced by VIP in cultured lung explants and in ATII cells; ③ H7 (10 − 5  mol/l), a PKC inhibitor could also reduce VIP induced [ 3H] choline incorporation, microsomal CCT mRNA expression and CCT activity in cultured lung explants and in ATII cells. These results demonstrated that VIP receptors, PKC and c-Fos protein played important roles in the signaling pathway through which VIP promoted the synthesis of PC.