Hematopoiesis on cellulose ester membranes (CEM). XII. Effect of membrane enrichment by purified matrix proteins.

Cellulose ester membranes (CEM) were enriched with the following purified matrix proteins: collagen I, II, IV, proteoglycan and laminin. Fifteen milligrams of each were placed on CEM which were then folded into open-ended tubes implanted i.p. and s.c. CEM were removed after 3, 6 and 12 months and examined histologically. There was no evidence of hematopoiesis or new bone formation on the implanted, enriched CEM at any of the intervals examined. Collagen I and proteoglycan-enriched CEM showed evidence of increased sinusoid-like vascular structures.