Inhibition of immune reactions in vivo by liposome associated transforming growth factor (TGF) type beta 1.

Abstract:

:In view of its potent inhibitory capacity on immune cells in culture, we wished to determine the ability of transforming growth factor (TGF) beta 1 to down-regulate immune responses in vivo. Preliminary experiments suggested that, at the doses used, systemic injection of soluble TGF beta 1 could not affect bacterial-induced spleen enlargement in mice. Therefore, we sought to utilize a physiochemical property of this molecule, namely its high pI, to determine possible association between the ligand and preformed liposomes possessing an opposite charge. TGF beta 1 was preferentially associated with negatively charged, but not with neutral, liposomes. These TGF beta 1 associated liposomes were able to deliver a suppressive signal to indicator cells in vitro. Intravenous injection of TGF beta 1, associated with liposomes possessing an opposite charge, into mice immunized with heat-killed Corynebacterium parvum significantly reduced the size of the spleen as well as the number of splenocytes. Systemically administered TGF beta 1 associated liposomes could also inhibit delayed type hypersensitivity reactions to Listeria monocytogenes. These data suggest that appropriately administered, TGF beta 1 can inhibit immune responses in vivo.

journal_name

Clin Exp Immunol

authors

Strassmann G,Bertolini DR,Eidelman O

doi

10.1111/j.1365-2249.1991.tb02965.x

subject

Has Abstract

pub_date

1991-12-01 00:00:00

pages

532-6

issue

3

eissn

0009-9104

issn

1365-2249

journal_volume

86

pub_type

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