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- Document 0725
- DOCN M9620725
- TI Insulin-like growth factor-1 (IGF-1) protects NOD mice from insulitis
- and diabetes.
- DT 9602
- AU Bergerot I; Fabien N; Maguer V; Thivolet C; INSERM U. 197, Faculte de
- Medecine, Alexis Carrel, Lyon,; France.
- SO Clin Exp Immunol. 1995 Nov;102(2):335-40. Unique Identifier : AIDSLINE
- MED/96069884
- AB To evaluate the effect of IGF-1 on the autoimmune process of beta cell
- destruction, permissive non-obese diabetic (NOD) recipients were
- adoptively transferred with 7 x 10(6) autoreactive T cells from diabetic
- NOD mice and were administered subcutaneously 10 micrograms rhIGF-1,
- twice daily for 3 weeks. Administration of rhIGF-1 reduced the final
- incidence of successful transfers of diabetes observed in only 6/24 mice
- (25%) versus 12/21 (57%) in control mice. A marked reduction of
- insulitis during histological analysis of pancreatic glands was also
- observed. Mice treated with rhIGF-1 had a higher percentage of intact
- islets (48.6 +/- 12% versus 1.6 +/- 1.1%, P = 0.001) and a lower
- percentage of infiltrated islets. Islets from rhIGF-1-treated mice had a
- more intense insulin staining reflecting a higher beta cell mass, but no
- difference was observed in the amount of insulin content of pancreatic
- extracts and in the amounts of mRNA transcripts for proinsulin. No
- difference was also observed in the titres of three islet cell antibody
- (ICA)-positive sera and in the pattern of A2B5 staining. Some mice
- developed diabetes and severe islet cell infiltration despite rhIGF-1,
- thus indicating that some committed T cells were still able to invade
- the islets and cause beta cell destruction. The percentages of CD4+ and
- CD8+ T cells in the spleen of experimental mice were similar. To
- evaluate the effects of rhIGF-1 on cell trafficking in recipient mice, T
- cells from diabetic NOD Thy-1,2 mice injected into congenic NOD-N
- Thy-1,1 mice were monitored 3 weeks after adoptive cell transfer. The
- percentage of Thy-1,2+ T cells was significantly reduced in the spleen
- (10.8 +/- 1.3% versus 17.2 +/- 3.9%, P = 0.004) of rhIGF-1 treated mice
- in contrast to the thymus (68.4 +/- 7.9% versus 72.87 +/- 6.2%, P =
- 0.306), suggesting that rhIGF-1 could influence T cell trafficking to
- the lymphoid organs. The findings that rhIGF-1 has protective effects in
- autoimmune diabetes opens new perspectives for future experiments as
- well as for preventive strategies in human type I diabetes.
- DE Animal CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
- T-Lymphocytes/IMMUNOLOGY Diabetes Mellitus,
- Insulin-Dependent/IMMUNOLOGY/*PREVENTION & CONTROL Female Immunity,
- Cellular Immunization, Passive Insulin-Like Growth Factor
- I/*THERAPEUTIC USE Islets of Langerhans/IMMUNOLOGY Male Mice Mice,
- Inbred NOD Recombinant Proteins JOURNAL ARTICLE
-
- SOURCE: National Library of Medicine. NOTICE: This material may be
- protected by Copyright Law (Title 17, U.S.Code).
-
-