Autor/a:
|
Mas Moruno, Carlos; Dorfner, Petra M.; Manzenrieder, Florian; Neubauer, Stefanie; Reuning, Ute; Burgkart, Rainer; Kessler, Horst
|
Abstract:
|
It is well known that functionalization of surfaces
with cell adhesive peptides mimicking the integrin binding
motif of extracellular matrix proteins is a feasible approach
to improve osseointegration of implant materials. Also, modi-
fication of the surface properties of the material (e.g., rough-
ness) strongly influences cell behavior. However, these two
approaches are rarely studied together. This study addressed
the hypothesis that the combination of peptide functionaliza-
tion and surface roughness will have an enhancing effect on
the adhesion process of osteoblasts. To test this hypothesis,
a series of
a
v
b
3-selective cyclic RGD peptides were prepared
and immobilized on trimmed (
S
a
¼
0.74
l
m, smooth) and
sandblasted (
S
a
¼
3.24
l
m, rough) Ti6Al4V disks. Effects of
these surface modifications were evaluated with respect to
integrin
a
v
b
3-mediated adhesive capacity, cell morphology,
and spreading of primary human osteoblasts. After 3 h of
incubation, osteoblasts adhered more strongly on sand-
blasted than on trimmed noncoated Ti6Al4V surfaces. Their
attachment efficiency was further enhanced in the presence
of RGD peptides. However, peptide functionalization had a
relatively stronger impact on osteoblast attachment on
trimmed surfaces compared with sandblasted surfaces. Cell
morphology after 3 h of culture was exclusively altered by
surface topography. RGD coating was critical for osteoblast
spreading on both trimmed and sandblasted materials after
1 h of incubation but it showed almost negligible effects after
3 h. The results of this study provide evidence that the alli-
ance of RGD coating and surface topography on Ti6Al4V pos-
itively influences osteoblast adhesion and spreading,
especially at very early adhesion times |