MMP-9 and CD68(+) cells are required for tissue remodeling in response to natural hydroxyapatite

Autor(es)

Zambuzzi, Willian F. ^[1] ; Paiva, Katiucia B. S. ^[2] ; Menezes, Renato ^[3] ; Oliveira, Rodrigo C. ^[4] ; Taga, Rumio ^[4] ; Granjeiro, Jose M. ^{[5, 6, 7]}

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, IB, Dept Biochem, Campinas, SP - Brazil

^[2] Sao Paulo Dent Sch, Dept Oral Pathol, Sao Paulo - Brazil

^[3] Univ Pittsburgh, Sch Dent Med, Ctr Craniofacial & Dent Genet, Pittsburgh, PA - USA

^[4] Univ Sao Paulo, Bauru Dent Sch, Dept Biol Sci, Bauru, SP - Brazil

^[5] Univ Sao Paulo, Cell & Mol Therapy Ctr, Sao Paulo - Brazil

^[6] UFF, Dept Cell & Mol Biol, BR-020150 Rio De Janeiro - Brazil

^[7] Univ Fed Fluminense, IB, Dept Cell & Mol Biol, Niteroi, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Molecular Histology; v. 40, n. 4, p. 301-309, AUG 2009.
• Citações Web of Science: 22

Resumo

Large bone defects represent major clinical problems in the practice of reconstructive orthopedic and craniofacial surgery. The aim of this study was to examine, through immunohistochemistry approach, the involvement of MMP-9 and CD68(+) cells during tissue remodeling in response to natural hydroxyapatite (HA) implanted in rat subcutaneous tissue. Before experimentation, forty animals were randomly distributed into two experimental groups: Group-I (Gen-Ox (TM) micro-granules) and Group-II (Gen-Ox (TM) macro-granules). Afterwards, the biopsies were collected after 10, 20, 30, and 60 days post-implantation. Our results showed that at 10 days, a low-renewal foreign body type granuloma formation was observed in most of the cases. Macrophage- and fibroblast-like cells were the predominant type of cells positively stained for MMP-9 in both groups. Once macrophage-like cells seemed to be the major source of MMP9, antibody against pan-CD68 epitope was used to correlate these findings. In agreement, MMP-9 and CD68(+) cells were distributed at the periphery and the central region of the granuloma in all experimental periods, however no staining was observed in cell contacting to material. Besides macrophages, the lysosomal glycoprotein epitope recognized by CD68 antibodies can be expressed by mast cell granules and sometimes by fibroblasts. Taken together, our results suggest that xenogenic HA promotes extracellular matrix remodeling through induction of MMP-9 activity and presence of CD68(+) cells. (AU)

• Processo FAPESP: 08/53003-9 - Investigação da função da proteína tirosina fosfatase de baixa massa molecular (LMW-PTP) na adesão de osteoblastos e formação óssea
• Beneficiário: Willian Fernando Zambuzzi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado