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Increased tumorigenicity in the human pancreatic cell line MIA PaCa-2 is associated with an aberrant regulation of an IGF-1 autocrine loop and lack of expression of the TGF-beta type RII receptor.
J Cell Physiol 1995; 165(1):155-63JC

Abstract

The growth characteristics associated with tumorigenicity were determined in clones of MIA PaCa-2 and PANC-1 pancreatic carcinoma cells. MIA PaCa-2 cells differed from PANC-1 cells in that they rapidly formed tumors in nude mice, formed colonies more rapidly and formed larger colonies in soft agar, and were cloned more efficiently when seeded at low density. MIA PaCa-2 cells but not PANC-1 cells were stimulated to escape quiescence and undergo DNA synthesis with nutrient media lacking growth factors. Both cell lines were stimulated to proliferate with serum-free media containing EGF, transferrin, and insulin. Antibody neutralization assays indicated that an IGF-1 autocrine loop was required for the nutrient stimulation of growth in MIA PaCa-2 cells and for the growth-factor stimulation in both MIA PaCa-2 and PANC-1 cells. Both cell lines were stimulated to proliferate with exogenous IGF-1 in basal media; this stimulation was specifically blocked by antibodies to IGF-1 or its receptor. MIA PaCa-2 and PANC-1 cells expressed similar levels of IGF-1 receptor mRNA and showed similar binding kinetics in receptor binding assays. In contrast to PANC-1 cells, MIA PaCa-2 cells were insensitive to TGF-beta 1 and did not express TGF-beta receptor type II. The results suggest that the growth-factor independence is representative of a more tumorigenic phenotype. We hypothesize that growth-factor independence of MIA PaCa-2 cells is mediated by an aberrant regulation of an IGF-1 autocrine loop. A decreased regulation of this IGF-1 loop may be potentiated by loss of response to TGF-beta.

Authors+Show Affiliations

Department of Surgery, University of Kentucky Chandler Medical Center, Lexington 40536-0084, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

7559796

Citation

Freeman, J W., et al. "Increased Tumorigenicity in the Human Pancreatic Cell Line MIA PaCa-2 Is Associated With an Aberrant Regulation of an IGF-1 Autocrine Loop and Lack of Expression of the TGF-beta Type RII Receptor." Journal of Cellular Physiology, vol. 165, no. 1, 1995, pp. 155-63.
Freeman JW, Mattingly CA, Strodel WE. Increased tumorigenicity in the human pancreatic cell line MIA PaCa-2 is associated with an aberrant regulation of an IGF-1 autocrine loop and lack of expression of the TGF-beta type RII receptor. J Cell Physiol. 1995;165(1):155-63.
Freeman, J. W., Mattingly, C. A., & Strodel, W. E. (1995). Increased tumorigenicity in the human pancreatic cell line MIA PaCa-2 is associated with an aberrant regulation of an IGF-1 autocrine loop and lack of expression of the TGF-beta type RII receptor. Journal of Cellular Physiology, 165(1), pp. 155-63.
Freeman JW, Mattingly CA, Strodel WE. Increased Tumorigenicity in the Human Pancreatic Cell Line MIA PaCa-2 Is Associated With an Aberrant Regulation of an IGF-1 Autocrine Loop and Lack of Expression of the TGF-beta Type RII Receptor. J Cell Physiol. 1995;165(1):155-63. PubMed PMID: 7559796.
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TY - JOUR T1 - Increased tumorigenicity in the human pancreatic cell line MIA PaCa-2 is associated with an aberrant regulation of an IGF-1 autocrine loop and lack of expression of the TGF-beta type RII receptor. AU - Freeman,J W, AU - Mattingly,C A, AU - Strodel,W E, PY - 1995/10/1/pubmed PY - 1995/10/1/medline PY - 1995/10/1/entrez SP - 155 EP - 63 JF - Journal of cellular physiology JO - J. Cell. Physiol. VL - 165 IS - 1 N2 - The growth characteristics associated with tumorigenicity were determined in clones of MIA PaCa-2 and PANC-1 pancreatic carcinoma cells. MIA PaCa-2 cells differed from PANC-1 cells in that they rapidly formed tumors in nude mice, formed colonies more rapidly and formed larger colonies in soft agar, and were cloned more efficiently when seeded at low density. MIA PaCa-2 cells but not PANC-1 cells were stimulated to escape quiescence and undergo DNA synthesis with nutrient media lacking growth factors. Both cell lines were stimulated to proliferate with serum-free media containing EGF, transferrin, and insulin. Antibody neutralization assays indicated that an IGF-1 autocrine loop was required for the nutrient stimulation of growth in MIA PaCa-2 cells and for the growth-factor stimulation in both MIA PaCa-2 and PANC-1 cells. Both cell lines were stimulated to proliferate with exogenous IGF-1 in basal media; this stimulation was specifically blocked by antibodies to IGF-1 or its receptor. MIA PaCa-2 and PANC-1 cells expressed similar levels of IGF-1 receptor mRNA and showed similar binding kinetics in receptor binding assays. In contrast to PANC-1 cells, MIA PaCa-2 cells were insensitive to TGF-beta 1 and did not express TGF-beta receptor type II. The results suggest that the growth-factor independence is representative of a more tumorigenic phenotype. We hypothesize that growth-factor independence of MIA PaCa-2 cells is mediated by an aberrant regulation of an IGF-1 autocrine loop. A decreased regulation of this IGF-1 loop may be potentiated by loss of response to TGF-beta. SN - 0021-9541 UR - https://www.unboundmedicine.com/medline/citation/7559796/Increased_tumorigenicity_in_the_human_pancreatic_cell_line_MIA_PaCa_2_is_associated_with_an_aberrant_regulation_of_an_IGF_1_autocrine_loop_and_lack_of_expression_of_the_TGF_beta_type_RII_receptor_ L2 - https://doi.org/10.1002/jcp.1041650118 DB - PRIME DP - Unbound Medicine ER -