Characterization of insulin-like growth factor I and insulin receptors on cultured bovine adrenal fasciculata cells. Role of these peptides on adrenal cell function

Journal Article · Wed Jun 01 00:00:00 EDT 1988 · Endocrinology; (United States)

DOI:https://doi.org/10.1210/endo-122-6-2518· OSTI ID:6859937

Penhoat, A; Chatelain, P G; Jaillard, C; Saez, J M

We have characterized insulin-like growth factor I (IGF-I) and insulin receptors in cultured bovine adrenal cells by binding and cross-linking affinity experiments. At equilibrium the dissociation constant and the number of binding sites per cell for IGF-I were 1.4 +/- (SE) 0.3 x 10(-9) M and 19,200 +/- 2,100, respectively. Under reduction conditions, disuccinimidyl suberate cross-linked (/sup 125/I)iodo-IGF-I to one receptor complex with an Mr of 125,000. Adrenal cells also contain specific insulin receptors with an apparent dissociation constant (Kd) of 10(-9) M. Under reduction conditions (/sup 125/I)iodo-insulin binds to one band with an approximate Mr of 125,000. IGF-I and insulin at micromolar concentrations, but not at nanomolar concentrations, slightly stimulated DNA synthesis, but markedly potentiated the mitogenic action of fibroblast growth factor. Adrenal cells cultured in a serum-free medium containing transferrin, ascorbic acid, and insulin (5 micrograms/ml) maintained fairly constant angiotensin-II (A-II) receptor concentration per cell and increased cAMP release on response to ACTH and their steroidogenic response to both ACTH and A-II. When the cells were cultured in the same medium without insulin, the number of A-II receptors significantly decreased to 65% and the increased responsiveness was blunted. Treatment of such cells for 3 days with increasing concentrations of IGF-I (1-100 ng/ml) produced a 2- to 3-fold increase in A-II receptors and enhanced the cAMP response (3- to 4-fold) to ACTH and the steroidogenic response (4- to 6-fold) to ACTH and A-II. These effects were time and dose dependent (ED50 approximately equal to 10(-9) M). Insulin at micromolar concentrations produced an effect similar to that of IGF-I, but at nanomolar concentrations the effect was far less.

• Research Organization: INSERM U 307, Hopital Debrousse, Lyon (France)
• OSTI ID: 6859937
• Journal Information: Endocrinology; (United States), Vol. 122:6
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
GROWTH FACTORS
BIOCHEMICAL REACTION KINETICS
RECEPTORS
INSULIN
CHEMICAL COMPOSITION
ADRENAL GLANDS
AMP
ANGIOTENSIN
CATTLE
CELL CULTURES
CORTICOSTERONE
DNA REPLICATION
DOSE-RESPONSE RELATIONSHIPS
IODINE 125
TIME DEPENDENCE
TRACER TECHNIQUES
ADRENAL HORMONES
ANIMALS
BETA DECAY RADIOISOTOPES
BODY
CARDIOVASCULAR AGENTS
CORTICOSTEROIDS
DAYS LIVING RADIOISOTOPES
DOMESTIC ANIMALS
DRUGS
ELECTRON CAPTURE RADIOISOTOPES
ENDOCRINE GLANDS
GLANDS
GLOBULINS
GLUCOCORTICOIDS
HORMONES
HYDROXY COMPOUNDS
INTERMEDIATE MASS NUCLEI
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KETONES
KINETICS
MAMMALS
MEMBRANE PROTEINS
MITOGENS
NUCLEI
NUCLEIC ACID REPLICATION
NUCLEOTIDES
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
ORGANS
PEPTIDE HORMONES
PREGNANES
PROTEINS
RADIOISOTOPES
REACTION KINETICS
RUMINANTS
STEROIDS
VASOCONSTRICTORS
VERTEBRATES
550201* - Biochemistry- Tracer Techniques