Biomaterial Database

Insulin-like growth factor 1 induction of differentiation of porcine preadipocytes. 1989

T G Ramsay, and M E White, and C K Wolverton

Ohio State University, Columbus.

The role of insulin-like growth factor I (IGF-1) in the development of the porcine preadipocyte was studied. Primary cultures of stromal-vascular cells (containing preadipocytes) were derived from s.c. adipose tissue of pigs at 1 d of age by enzyme digestion and centrifugation. Cells were cultured for a total of 15 d. Cells were exposed to IGF-1 at concentrations of 0, 5, 25 or 50 ng/ml medium during one of four time periods: d 1-15, d 1-5, d 13-15, or 4 h on d 15 of culture. IGF-1 had a mitogenic effect on cells during the first three time periods as determined by coulter counting. IGF-1 induced the enzymatic differentiation of porcine preadipocytes following exposure for either the entire 15 d of culture or for only 48 h (d 13-15) after confluency had been attained (d 5). Histochemically, lipid accumulation over time paralleled changes in enzyme activity. Incubation of IGF-1 with the cell cultures during the logarithmic phase of growth (d 1-5) or for 4 h on d 15 did not affect enzyme activity. These data indicate that IGF-1 can induce the differentiation of porcine preadipocytes after the cells leave the logarithmic phase of growth through action on post-confluent events.

UI	MeSH Term	Description	Entries
D007334	Insulin-Like Growth Factor I	A well-characterized basic peptide believed to be secreted by the liver and to circulate in the blood. It has growth-regulating, insulin-like, and mitogenic activities. This growth factor has a major, but not absolute, dependence on GROWTH HORMONE. It is believed to be mainly active in adults in contrast to INSULIN-LIKE GROWTH FACTOR II, which is a major fetal growth factor.	IGF-I,Somatomedin C,IGF-1,IGF-I-SmC,Insulin Like Growth Factor I,Insulin-Like Somatomedin Peptide I,Insulin Like Somatomedin Peptide I
D008297	Male		Males
D002452	Cell Count	The number of CELLS of a specific kind, usually measured per unit volume or area of sample.	Cell Density,Cell Number,Cell Counts,Cell Densities,Cell Numbers,Count, Cell,Counts, Cell,Densities, Cell,Density, Cell,Number, Cell,Numbers, Cell
D002454	Cell Differentiation	Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs.	Differentiation, Cell,Cell Differentiations,Differentiations, Cell
D002455	Cell Division	The fission of a CELL. It includes CYTOKINESIS, when the CYTOPLASM of a cell is divided, and CELL NUCLEUS DIVISION.	M Phase,Cell Division Phase,Cell Divisions,Division Phase, Cell,Division, Cell,Divisions, Cell,M Phases,Phase, Cell Division,Phase, M,Phases, M
D002478	Cells, Cultured	Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.	Cultured Cells,Cell, Cultured,Cultured Cell
D006651	Histocytochemistry	Study of intracellular distribution of chemicals, reaction sites, enzymes, etc., by means of staining reactions, radioactive isotope uptake, selective metal distribution in electron microscopy, or other methods.	Cytochemistry
D000273	Adipose Tissue	Specialized connective tissue composed of fat cells (ADIPOCYTES). It is the site of stored FATS, usually in the form of TRIGLYCERIDES. In mammals, there are two types of adipose tissue, the WHITE FAT and the BROWN FAT. Their relative distributions vary in different species with most adipose tissue being white.	Fatty Tissue,Body Fat,Fat Pad,Fat Pads,Pad, Fat,Pads, Fat,Tissue, Adipose,Tissue, Fatty
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013002	Somatomedins	Insulin-like polypeptides made by the liver and some fibroblasts and released into the blood when stimulated by SOMATOTROPIN. They cause sulfate incorporation into collagen, RNA, and DNA synthesis, which are prerequisites to cell division and growth of the organism.	Sulfation Factor,Somatomedin,Factor, Sulfation