home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
HEALTH
/
MED9602.ZIP
/
M9620725.TXT
< prev
next >
Wrap
Text File
|
1996-02-26
|
3KB
|
50 lines
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).