The effect of transfection of antisense cDNA for procollagen alpha 1 (IV) on stimulated proliferation in rat glomerular endothelial cells.
Glomerular endothelial cells were stably transfected with a pMAMneo-Blue vector recombinant for procollagen alpha 1 (IV) cDNA in the sense (S) or antisense (AS) orientation utilizing a calcium phosphate precipitation technique. Cellular clones resistant to G418 antibiotic were selected and expanded for further analysis. Immunofluorescence microscopy demonstrated less Type IV collagen in the AS clones (1.0 +/- 0.3) than in control parent (P) and S clones (2.0 +/- 0.4) (P < 0.05). Western analysis showed that the AS clones synthesized 20 +/- 10% of the 205-kd alpha 1 (IV) chain of Type IV collagen compared with P cells (P < 0.05). As transfected clones demonstrated similar basal proliferation rates as control cells when cultured in 0.5% fetal calf serum (FCS), but failed to undergo fetal calf serum (FCS)-stimulated hyperplasia when grown on standard fibronectin-coated surfaces in 40% FCS (P < 0.05, compared with P- and S-transfected control cells). There were significant linear relationships between the presence of Type IV collagen as detected by either immunofluorescence microscopy or alpha 1 (IV) peptide chain quantitation by Western analysis and the ability of cells to undergo FCS-stimulated hyperplasia when grown on fibronectin (P < 0.05). Growth on a surface comprised of fibronectin plus Type IV collagen restored the capacity of AS transfected cells to respond to FCS stimulation (P < 0.001), but had no significant effect on the proliferative behavior of P or S cells. Measurements of AS RNA levels in these cells suggest that the inhibition of stimulated proliferation is determined by the presence of a threshold quantity of cellular AS RNA. These data demonstrate that Type IV collagen plays a critical role in conditioning glomerular endothelial cells to respond to proliferative stimuli.
Artishevsky
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Department of Internal Medicine. Harbor-UCLA Medical Center, Torrance 90509, USA.
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Adler
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Feld
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Glassock
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Adler
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D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D015153:Blotting, Western; D002455:Cell Division / Q000502:physiology; D002478:Cells, Cultured; D016373:DNA, Antisense / Q000235:genetics*; D018076:DNA, Complementary / Q000235:genetics*; D003720:Densitometry; D004727:Endothelium / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D005839:Gentamicins / Q000494:pharmacology; D007678:Kidney Glomerulus / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D008856:Microscopy, Fluorescence; D011347:Procollagen / Q000096:biosynthesis* / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D014162:Transfection
D000900:Anti-Bacterial Agents; D016373:DNA, Antisense; D018076:DNA, Complementary; D005839:Gentamicins; D011347:Procollagen; C010680:antibiotic G 418