Tags

Type your tag names separated by a space and hit enter

Malignant breast epithelium selects for insulin-like growth factor II expression in breast stroma: evidence for paracrine function.
Cancer Res. 1995 Jun 01; 55(11):2448-54.CR

Abstract

Paracrine interactions between stromal and epithelial cells are important influences on the growth and malignant behavior of breast cancers. Insulin-like growth factors I and II (IGF-I and II) are expressed by fibroblasts in benign and malignant breast lesions, and both are strong mitogens for a number of breast cancer epithelial cell lines in vitro. We have analyzed the stromal mRNA expression of IGF-I and IGF-II in matched sets of fibroblast cell lines derived from three locations in the affected breast of eight patients with breast cancer: (a) the breast tumor itself; (b) surrounding normal breast tissue; and (c) overlying breast skin. IGF-I expression was easily detected in all fibroblasts derived from normal breast tissue. In general, lesser amounts of IGF-I mRNA were detected in fibroblasts derived from breast tumors or skin. In contrast, IGF-II expression was detected at very low levels in only 3 of 8 normal breast fibroblasts, but was present in 6 of 8 tumor fibroblasts. IGF-II mRNA was expressed in all skin fibroblasts tested. IGF-II-negative stromal fibroblasts from normal breast, which were plated at low density and allowed to grow to confluence in the presence of MCF-7 breast tumor epithelial cells, demonstrated a marked increase in IGF-II mRNA expression. IGF-II in situ hybridization studies confirmed that IGF-II expression is seen at high levels in stroma of many invasive breast cancers but not normal breast. We conclude that paracrine influences, mediated by soluble factors released by breast tumor epithelium, are able to specifically increase expression of IGF-II in breast stroma, most likely by a process of clonal selection.

Authors+Show Affiliations

Vincent T. Lombardi Cancer Research Center, Georgetown University, Washington, DC 20007, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

7757999

Citation

Singer, C, et al. "Malignant Breast Epithelium Selects for Insulin-like Growth Factor II Expression in Breast Stroma: Evidence for Paracrine Function." Cancer Research, vol. 55, no. 11, 1995, pp. 2448-54.
Singer C, Rasmussen A, Smith HS, et al. Malignant breast epithelium selects for insulin-like growth factor II expression in breast stroma: evidence for paracrine function. Cancer Res. 1995;55(11):2448-54.
Singer, C., Rasmussen, A., Smith, H. S., Lippman, M. E., Lynch, H. T., & Cullen, K. J. (1995). Malignant breast epithelium selects for insulin-like growth factor II expression in breast stroma: evidence for paracrine function. Cancer Research, 55(11), 2448-54.
Singer C, et al. Malignant Breast Epithelium Selects for Insulin-like Growth Factor II Expression in Breast Stroma: Evidence for Paracrine Function. Cancer Res. 1995 Jun 1;55(11):2448-54. PubMed PMID: 7757999.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Malignant breast epithelium selects for insulin-like growth factor II expression in breast stroma: evidence for paracrine function. AU - Singer,C, AU - Rasmussen,A, AU - Smith,H S, AU - Lippman,M E, AU - Lynch,H T, AU - Cullen,K J, PY - 1995/6/1/pubmed PY - 1995/6/1/medline PY - 1995/6/1/entrez SP - 2448 EP - 54 JF - Cancer research JO - Cancer Res VL - 55 IS - 11 N2 - Paracrine interactions between stromal and epithelial cells are important influences on the growth and malignant behavior of breast cancers. Insulin-like growth factors I and II (IGF-I and II) are expressed by fibroblasts in benign and malignant breast lesions, and both are strong mitogens for a number of breast cancer epithelial cell lines in vitro. We have analyzed the stromal mRNA expression of IGF-I and IGF-II in matched sets of fibroblast cell lines derived from three locations in the affected breast of eight patients with breast cancer: (a) the breast tumor itself; (b) surrounding normal breast tissue; and (c) overlying breast skin. IGF-I expression was easily detected in all fibroblasts derived from normal breast tissue. In general, lesser amounts of IGF-I mRNA were detected in fibroblasts derived from breast tumors or skin. In contrast, IGF-II expression was detected at very low levels in only 3 of 8 normal breast fibroblasts, but was present in 6 of 8 tumor fibroblasts. IGF-II mRNA was expressed in all skin fibroblasts tested. IGF-II-negative stromal fibroblasts from normal breast, which were plated at low density and allowed to grow to confluence in the presence of MCF-7 breast tumor epithelial cells, demonstrated a marked increase in IGF-II mRNA expression. IGF-II in situ hybridization studies confirmed that IGF-II expression is seen at high levels in stroma of many invasive breast cancers but not normal breast. We conclude that paracrine influences, mediated by soluble factors released by breast tumor epithelium, are able to specifically increase expression of IGF-II in breast stroma, most likely by a process of clonal selection. SN - 0008-5472 UR - https://www.unboundmedicine.com/medline/citation/7757999/Malignant_breast_epithelium_selects_for_insulin_like_growth_factor_II_expression_in_breast_stroma:_evidence_for_paracrine_function_ L2 - http://cancerres.aacrjournals.org/cgi/pmidlookup?view=long&pmid=7757999 DB - PRIME DP - Unbound Medicine ER -