Eissner, Guenther and Lindner, H. and Konur, A. and Kreutz, M. and Andreesen, Reinhard and Holler, Ernst (2000) Naive monocytes can trigger transendothelial migration of peripheral blood cells through the induction of endothelial tumour necrosis factor-alpha. SCANDINAVIAN JOURNAL OF IMMUNOLOGY, 51 (3). pp. 251-261. ISSN 0300-9475
Full text not available from this repository. (Request a copy)Abstract
In this manuscript we describe a potentially new mechanism by which unstimulated human monocytes activate endothelial cells (EC) through the secondary induction of endothelial tumour necrosis factor alpha (TNF-alpha). Serum free supernatants (SN) of peripheral blood mononuclear cells (PBMC) strongly induce the expression of intercellular adhesion molecule 1 (ICAM-1, CD54), vascular cell adhesion molecule 1 (VCAM-1, CD106), and endothelial-leukocyte adhesion molecule 1 (ELAM-1, CD62E) on human EC 24 and 4 h post treatment, respectively. Further characterization of the responsible subpopulation revealed the CD14(+) monocytes and a monocytic cell line (MM6) to produce an endothelial activating factor (EAF). The EAF also triggers an adhesion and a transendothelial migration (TEM) of peripheral blood cells. Using neutralization with an anti TNF-alpha MoAb MAK195, EAF is not identical with TNF-alpha, but induces the expression of endothelial TNF-alpha, since MAK195 blocked TEM only when coincubated with EC, not with monocytes. Furthermore, intracellular TNF-alpha was significantly upregulated in EC after treatment with SN-MM6. Another evidence for a secondary autocrine mechanism was provided by culturing the EC with a conditioned medium of SN-MM6 treated EC. This conditioned medium induces an adhesion molecule expression and TEM in a similar way to SN-MM6 and can completely be inactivated by anti TNF-alpha. Taken together, these data may have an impact for, e.g. transplantational settings that donor monocytes may trigger an inflammatory response in the absence of further activation signals by eliciting an endogenous TNF-alpha response in the host.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BONE-MARROW TRANSPLANTATION; VERSUS-HOST DISEASE; LYMPHOCYTE-T ADHESION; INTERLEUKIN-10 PROTECTS; BACTERIAL-ENDOTOXIN; IN-VITRO; INTERFERON; MECHANISMS; CYTOKINES; BINDING; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Innere Medizin III (Hämatologie und Internistische Onkologie) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 01 Jun 2022 09:13 |
| Last Modified: | 01 Jun 2022 09:13 |
| URI: | https://pred.uni-regensburg.de/id/eprint/42810 |
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