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1996-02-27
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Document 0669
DOCN M9630669
TI Type I insulin-like growth factor receptor expression in different
developmental stages of human thymocytes.
DT 9603
AU Kooijman R; Scholtens LE; Rijkers GT; Zegers BJ; Department of
Immunology, University Hospital for Children and; Youth Het Wilhelmina
Kinderziekenhuis, Utrecht, The Netherlands.
SO J Endocrinol. 1995 Nov;147(2):203-9. Unique Identifier : AIDSLINE
MED/96096292
AB Insulin-like growth factor-I (IGF-I) has been implicated in playing a
regulatory role in T cell development and in T cell function. We
demonstrate the presence of type I IGF receptors on human thymocytes
using radioligand binding assays and flowcytometric analysis. The
relative potencies of IGF-I, IGF-II and insulin for competition with
125I- IGF-I indicate the presence of type I IGF receptors. Scatchard
analysis revealed that the average number of receptors per thymocyte is
257 +/- 28 with a Kd of 0.12 +/- 0.01. With multicolour flowcytometry
using a type I IGF receptor specific monoclonal antibody (alpha IR3), we
show that CD4-CD8- cells express 3-4 times more receptors per cell as
compared with CD4+CD8+, CD4+CD8- and CD4-CD8+ cells. IGF-I directly
stimulated DNA synthesis of thymocytes and potentiated DNA synthesis in
mitogen-activated thymocytes. These results indicate that IGF-I can
influence T cell development in humans at the level of the thymus.
DE Binding, Competitive Cell Culture CD4-Positive
T-Lymphocytes/METABOLISM CD8-Positive T-Lymphocytes/METABOLISM
DNA/BIOSYNTHESIS Flow Cytometry Fluorescent Antibody Technique Human
Insulin/METABOLISM Insulin-Like Growth Factor I/METABOLISM/PHARMACOLOGY
Insulin-Like Growth Factor II/METABOLISM Radioligand Assay Receptors,
Insulin-Like-Growth Factor I/*ANALYSIS/METABOLISM
T-Lymphocytes/*METABOLISM/PHYSIOLOGY Thymus Gland/METABOLISM JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).