Mp. Ferraz et al., In vitro growth and differentiation of osteoblast-like human bone marrow cells on glass reinforced hydroxyapatite plasma-sprayed coatings, J MAT S-M M, 10(9), 1999, pp. 567-576
Citations number
49
Categorie Soggetti
Multidisciplinary
Journal title
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
Human osteoblastic bone marrow cells were cultured for periods of up to 28
days in control conditions and on the surface of a glass reinforced hydroxy
apatite composite (HA/G1) and commercial hydroxyapatite (HA) plasma-sprayed
coatings, in the "as-received" condition and after immersion treatment in
culture medium for 21 days. Cultures were characterized for total protein c
ontent and alkaline phosphatase activity. Scanning electron microscope anal
yses were performed on control cultures, seeded materials and materials inc
ubated in the absence of cells. Culture media were analyzed for total and i
onized calcium and phosphorus concentrations throughout the incubation peri
od. Immersion of HA/G1 and HA coatings in culture medium resulted in signif
icant alterations to the levels of calcium and phosphorus in the medium, le
ading to surface modifications. However, seeded material samples showed sig
nificant differences in the pattern of variation of the levels of these spe
cies. Cell proliferation was observed in the "as-received" HA/G1 composite,
but cell mediated formation of mineral deposits was not proved. In contras
t, "as-received" HA hardly supported cell growth. Previously immersed mater
ial samples showed cell proliferation and evidence of biological formation
of mineral deposits. However, the HA/G1 composite presented better surface
characteristics for cell growth as the behavior of bone marrow cells was cl
oser to that observed in control cultures. (C) 1999 Kluwer Academic Publish
ers.