Secreted collagen ratios in normal human and osteogenesis imperfecta skin fibroblasts.

Abstract:

:We examined the effects of several variables on the ratio of type I:type III collagen secreted by human caucasian skin fibroblasts in normal and osteogenesis imperfecta (OI) phenotypes. Isotopically labelled collagen extracted from fibroblast medium was analyzed by DEAE-cellulose chromatography and identified by appropriate methods. Type I procollagen was the major form of collagen secreted into the medium by normal cells cultured from one mid-term fetus, infants (n = 3), children (n = 3), adolescents (n = 2), and adults (n = 3). Interstrain differences in collagen production under standardized conditions were significantly greater than intrastrain variation (anova, p = 0.0051). There was no significant alteration in the type I:type III collagen ratio due to variation in: phase of cell growth, doublings (between 13th and 22nd), rate of isotope incorporation, labelling time (24-72 hrs) in the presence of ascorbic acid (50 micrograms/ml), age of donor (with the possible exception of adolescence), and site of biopsy (genital and non-genital sites). Variable conversion of type I procollagen to collagen did not perturb the type I:type III collagen ratio. Cell strains from OI patients (Sillence classification): type I (one strain); type II, III and IV (3 strains each) had greater interstrain than intrastrain variation in the collagen ratio (p = 0.0149). Interstrain differences were greater in OI cell strains relative to normal cell strains (p less than 0.01). In the aggregate, OI cells had significantly lower type I collagen production relative to type III (I/III ratio = 1.18) when compared with normal cells (I/III ratio = 2.90; t test, p less than 0.0001). These findings imply abnormal synthesis, secretion or stability of type I procollagen and greater phenotypic heterogeneity in OI skin fibroblasts relative to normal cells.

journal_name

Connect Tissue Res

authors

Fraser J,Lancaster GA,Scriver CR

doi

10.3109/03008208309015011

subject

Has Abstract

pub_date

1983-01-01 00:00:00

pages

57-67

issue

1

eissn

0300-8207

issn

1607-8438

journal_volume

11

pub_type

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