Growth abnormalities of cultured human skin fibroblasts derived from individuals with hereditary adenomatosis of the colon and rectum

Abstract

A heritable propensity to develop malignant lesions is found in individuals with familial adenomatosis of the colon and rectum (ACR) and the Gardner's syndrome variant, an autosomal dominant trait. In the present study, the growth characteristics of cultured skin fibroblasts (SF) derived from normal‐appearing flat skin biopsies of ACR families, representing all phenotypes, and appropriate controls were investigated. SF were obtained from stocks between the second and fifth passages and grown to confluency in Eagle's Minimal Essential Medium (EMEM) supplemented with 15% fetal calf serum (FCS). Following trypsinization, cells were replanted in EMEM supplemented with either 1% or 15% FCS at an initial density of 4 × 10³ cells/cm² and counted daily for five days. Normal SF representing several age groups (both sexes) and those obtained from non‐afflicted individuals of ACR families grew only in 15% FCS. In contrast, SF from ACR subjects and from embryonal skin grew both in 1% and 15% FCS. SF from several clinically asymptomatic adults, children of ACR patients, grew in 1% FCS as well. Cell cultures from ACR individuals showed regions of criss‐crossed arrays and multilayered pattern. These growth properties were not observed in normal cell cultures. The SF from ACR individuals did not grow in methocel, nor did they form tumors in athymic mice. These results suggest the occurrence of previously undetected biochemical alterations in SF taken from ACR genotypes.