Cholecystokinin octapeptide regulates lipopolysaccharide-activated B cells co-stimulatory molecule expression and cytokines production in vitro.
Cholecystokinin octapeptide (CCK8) can exert the immunoregulatory roles through activating immune cell surface receptors such as T lymphocytes, macrophages, dendritic cells, and so on. In this study, we discussed the effects of CCK8 on lipopolysaccharide (LPS)-activated B cells in terms of the expression of co-stimulatory molecules, and the capacity to activate CD4(+) T cells and cytokines production in vitro. The results revealed that B cells expressed two types of CCK receptors; CCK8 inhibited the expression of co-stimulatory molecules such as CD80 and CD86 on LPS-activated B cells, suppressed the proliferation of allogeneic T cells in a dose-dependent manner, and also reduced the secretion of Th1-type cytokine IFN-γ, whereas enhanced the secretion of Th2-type cytokine IL-4 by LPS-activated B cells. Both CCK1R and CCK2R participated in these effects. Taken together, CCK8 is capable of exerting immunomodulatory functions through B cells.
Basic Medical College, Hebei Medical University, Shijiazhuang, People's Republic of China.
Jing-Ge
JG
Zhang
Bin
B
Cong
Qiao-Xia
QX
Li
Hai-Ying
HY
Chen
Jin
J
Qin
Li-Hong
LH
Fu
D000818:Animals; D015703:Antigens, CD / Q000096:biosynthesis* / Q000276:immunology; D001402:B-Lymphocytes / Q000187:drug effects* / Q000276:immunology; D018122:B7-1 Antigen / Q000096:biosynthesis / Q000276:immunology; D051940:B7-2 Antigen / Q000096:biosynthesis / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology; D002478:Cells, Cultured; D016207:Cytokines / Q000096:biosynthesis / Q000276:immunology*; D005434:Flow Cytometry; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008213:Lymphocyte Activation / Q000187:drug effects / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D011949:Receptors, Cholecystokinin / Q000096:biosynthesis* / Q000276:immunology; D012844:Sincalide / Q000494:pharmacology*
D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D016207:Cytokines; D008070:Lipopolysaccharides; D011949:Receptors, Cholecystokinin; C440499:lipopolysaccharide, Escherichia coli O111 B4; D012844:Sincalide