Involvement of TGF-beta in inhibitory effects of negatively charged liposomes on nitric oxide production by macrophages stimulated with lps.
We examined the role of TGF-beta in the inhibitory effects of negatively charged liposomes composed of phosphatidylserine (PS-liposomes) on nitric oxide (NO) production by macrophages stimulated with LPS. The expression of TGF-beta mRNA increased when mouse peritoneal macrophages were treated with PS-liposomes. The inhibitory effect of PS-liposomes on NO production was restored by treatment with anti-TGF-beta antibody. Furthermore, NO production, iNOS mRNA expression, and iNOS protein induction by LPS were inhibited by treatment of macrophages with TGF-beta as well as PS-liposomes. These results indicated that PS-liposomes down-regulate NO production by macrophages through the induction of TGF-beta and suggested that TGF-beta may suppress NO production upstream of the transcription of iNOS mRNA.
Matsuno
R
R
Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Tokyo, Hachioji, 192-0392, Japan.
Aramaki
Y
Y
Tsuchiya
S
S
D000818:Animals; D001483:Base Sequence; D017931:DNA Primers; D004789:Enzyme Activation; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008081:Liposomes; D008264:Macrophages / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D009569:Nitric Oxide / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016212:Transforming Growth Factor beta / Q000502:physiology*; D048051:p38 Mitogen-Activated Protein Kinases
D017931:DNA Primers; D008070:Lipopolysaccharides; D008081:Liposomes; D016212:Transforming Growth Factor beta; D009569:Nitric Oxide; D020928:Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases