Biomaterial Database

Insulin-like growth factor 1 (IGF-1) receptors, IGF-1, and IGF-2 are expressed in primary human sarcomas. 1995

A Sekyi-Otu, and R S Bell, and C Ohashi, and M Pollak, and I L Andrulis

Samuel Lunenfeld Research Institute, University of Toronto, Ontario, Canada.

A variety of bone and soft-tissue sarcoma cell lines have been shown to express receptors for insulin-like growth factor-1 (IGF-1) and to respond mitogenically to IGF-1 in vitro. We have recently demonstrated evidence of IGF dependency in murine MGH-OGS and RIF-1 sarcomas, which express relatively high and intermediate levels of IGF-1 receptors. Overexpression of IGF-1 receptors and/or IGF ligands might, therefore, be a mechanism by which human bone and soft-tissue sarcomas obtain a proliferative advantage over normal adjacent tissues. Therefore, we evaluated 29 human sarcoma specimens for expression of IGF-1 receptor, IGF-1, and IGF-2 by competitive binding and reverse-transcription polymerase chain reaction (RT-PCR) techniques. Twelve of 29 sarcomas examined by RT-PCR and 13 of 25 examined by affinity-binding studies expressed IGF-1 receptor levels equal to or greater than levels determined in the IGF-responsive MCF-7 breast carcinoma cell line. DNA amplification of the IGF-1 receptor gene was not identified in this group of sarcomas that expressed high levels of IGF-1 receptor. Evaluation of IGF ligand expression by RT-PCR revealed that 22 of 28 sarcomas expressed IGF-1 levels comparable to or above those of the RPMI 7666 control line, and 17 of 27 sarcomas expressed significant levels of IGF-2 compared with the NCI H69 control cell line. These results suggest that autocrine/paracrine regulatory mechanisms might be responsible for the growth of some sarcomas.

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
D007335	Insulin-Like Growth Factor II	A well-characterized neutral peptide believed to be secreted by the LIVER and to circulate in the BLOOD. It has growth-regulating, insulin-like and mitogenic activities. The growth factor has a major, but not absolute, dependence on SOMATOTROPIN. It is believed to be a major fetal growth factor in contrast to INSULIN-LIKE GROWTH FACTOR I, which is a major growth factor in adults.	IGF-II,Multiplication-Stimulating Activity,Somatomedin MSA,IGF-2,Insulin Like Growth Factor II,Insulin-Like Somatomedin Peptide II,Multiplication-Stimulating Factor,Somatomedin A,Factor, Multiplication-Stimulating,Insulin Like Somatomedin Peptide II,Multiplication Stimulating Activity,Multiplication Stimulating Factor
D008969	Molecular Sequence Data	Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.	Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D005784	Gene Amplification	A selective increase in the number of copies of a gene coding for a specific protein without a proportional increase in other genes. It occurs naturally via the excision of a copy of the repeating sequence from the chromosome and its extrachromosomal replication in a plasmid, or via the production of an RNA transcript of the entire repeating sequence of ribosomal RNA followed by the reverse transcription of the molecule to produce an additional copy of the original DNA sequence. Laboratory techniques have been introduced for inducing disproportional replication by unequal crossing over, uptake of DNA from lysed cells, or generation of extrachromosomal sequences from rolling circle replication.	Amplification, Gene
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001483	Base Sequence	The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.	DNA Sequence,Nucleotide Sequence,RNA Sequence,DNA Sequences,Base Sequences,Nucleotide Sequences,RNA Sequences,Sequence, Base,Sequence, DNA,Sequence, Nucleotide,Sequence, RNA,Sequences, Base,Sequences, DNA,Sequences, Nucleotide,Sequences, RNA
D001667	Binding, Competitive	The interaction of two or more substrates or ligands with the same binding site. The displacement of one by the other is used in quantitative and selective affinity measurements.	Competitive Binding
D012509	Sarcoma	A connective tissue neoplasm formed by proliferation of mesodermal cells; it is usually highly malignant.	Sarcoma, Epithelioid,Sarcoma, Soft Tissue,Sarcoma, Spindle Cell,Epithelioid Sarcoma,Epithelioid Sarcomas,Sarcomas,Sarcomas, Epithelioid,Sarcomas, Soft Tissue,Sarcomas, Spindle Cell,Soft Tissue Sarcoma,Soft Tissue Sarcomas,Spindle Cell Sarcoma,Spindle Cell Sarcomas
D016133	Polymerase Chain Reaction	In vitro method for producing large amounts of specific DNA or RNA fragments of defined length and sequence from small amounts of short oligonucleotide flanking sequences (primers). The essential steps include thermal denaturation of the double-stranded target molecules, annealing of the primers to their complementary sequences, and extension of the annealed primers by enzymatic synthesis with DNA polymerase. The reaction is efficient, specific, and extremely sensitive. Uses for the reaction include disease diagnosis, detection of difficult-to-isolate pathogens, mutation analysis, genetic testing, DNA sequencing, and analyzing evolutionary relationships.	Anchored PCR,Inverse PCR,Nested PCR,PCR,Anchored Polymerase Chain Reaction,Inverse Polymerase Chain Reaction,Nested Polymerase Chain Reaction,PCR, Anchored,PCR, Inverse,PCR, Nested,Polymerase Chain Reactions,Reaction, Polymerase Chain,Reactions, Polymerase Chain
D017526	Receptor, IGF Type 1	A protein-tyrosine kinase receptor that is closely related in structure to the INSULIN RECEPTOR. Although commonly referred to as the IGF-I receptor, it binds both IGF-I and IGF-II with high affinity. It is comprised of a tetramer of two alpha and two beta subunits which are derived from cleavage of a single precursor protein. The beta subunit contains an intrinsic tyrosine kinase domain.	IGF Type 1 Receptor,IGF-I Receptor,Receptor, IGF-I,Receptor, Insulin-Like Growth Factor I,Receptor, Insulin-Like Growth Factor Type 1,IGF-1 Receptor,Insulin-Like-Growth Factor I Receptor,Receptor, IGF Type 1 alpha Subunit,Receptor, IGF Type 1 beta Subunit,Receptors, IGF-1,Receptors, Insulin-Like-Growth Factor I,IGF 1 Receptor,IGF I Receptor,IGF-1 Receptors,Insulin Like Growth Factor I Receptor,Receptor, IGF I,Receptor, IGF-1,Receptors, IGF 1