The upregulation by peplomycin of signal transduction in human cells.
To explore the mechanism of pulmonary fibrosis by bleomycin and its derivative, peplomycin (PLM), we examined the influence of PLM on signal transduction in human peripheral blood lymphocytes (HL), monocytes (HM) and fibroblasts (HF). Tyrosine phosphorylation of multiple proteins in HL and HM were induced by 0.001 to 0.05 microg/ml and by 0.01 to 0.5 microg/ml of PLM, respectively. In HF, 116-kDa protein was phosphorylated 0.2 to 5 microg/ml of PLM. When HL were treated with 0.01 microg/ml of PLM, phosphorylation of p56lck and activation of extracellular-signal related kinase-2 (ERK2) were induced. ERK2 was also activated in HM. Coordinately, the ratio of p21ras-binding GTP/GDP was increased by PLM. As well as interleukin-2, PLM induced tyrosine phosphorylation of JAK-3. In addition, PLM upregulated the nuclear translocation of nuclear factor-kappa B and the expression of c-myc-mRNA in HL, HM and HF. Furthermore, 0.01 to 0.001 microg/ml PLM enhanced the cytokine generation by HL and HM, and 1 to 5 microg/ml PLM increased cytokine generation and collagen synthesis by HF. These upregulatory effects of PLM were abrogated by pretreatment of the cells with a tyrosine kinase inhibitor. These results indicate that PLM upregulates signal transduction in a variety of cell types and the upregulation may induce pulmonary fibrosis.
Yamamoto
T
T
Department of Oral Surgery, Kochi Medical School, Nankoku-city, Japan. yamamott@kochi-ms.ac.jp
Yoneda
K
K
Ueta
E
E
Osaki
T
T
D000903:Antibiotics, Antineoplastic / Q000494:pharmacology*; D002478:Cells, Cultured; D005347:Fibroblasts / Q000187:drug effects / Q000378:metabolism; D016259:Genes, myc / Q000187:drug effects; D006801:Humans; D008214:Lymphocytes / Q000187:drug effects / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D009000:Monocytes / Q000187:drug effects / Q000378:metabolism; D016328:NF-kappa B / Q000378:metabolism*; D015689:Oncogene Protein p21(ras) / Q000235:genetics / Q000378:metabolism; D017663:Peplomycin / Q000494:pharmacology*; D010766:Phosphorylation / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects*; D014443:Tyrosine / Q000378:metabolism; D015854:Up-Regulation / Q000187:drug effects
D000903:Antibiotics, Antineoplastic; D016328:NF-kappa B; D012333:RNA, Messenger; D014443:Tyrosine; D017663:Peplomycin; D019950:Mitogen-Activated Protein Kinase 1; D015689:Oncogene Protein p21(ras)