Platelet-derived growth factor (PDGF) isoform and PDGF receptor expression in drug-induced gingival overgrowth and hereditary gingival fibrosis.

Abstract

OBJECTIVE:

To investigate possible associations between platelet-derived growth factor (PDGF), PDGF receptor expression and macrophages in drug-induced and hereditary gingival overgrowth.

MATERIALS AND METHODS:

Tissues from patients with drug-induced gingival overgrowth (DIGO) (n = 10) and hereditary gingival fibrosis (n = 10) were studied and compared with 'control' gingiva (n = 10). Expression of PDGF and its alpha and beta receptors was investigated immunohistochemically and by RT-PCR. Macrophages were identified by immunostaining for CD68.

RESULTS:

PDGF isoforms and receptors were detected in most cells within all specimens. There were no differences in the numbers of macrophages, or fibroblasts expressing PDGF or receptors, between groups. The level of PDGF expression by fibroblasts, determined by absorbance measurements, was similar between groups for PDGF A. Significantly lower levels of total PDGF and the receptors were detected in drug-induced overgrowth compared to those in hereditary fibrosis (P < 0.004) and control specimens (P < 0.034). All specimens expressed mRNA for PDGF A, PDGF B and alpha and beta receptors.

CONCLUSIONS:

These data do not support a pivotal role for macrophage-derived PDGF B in the pathogenesis of DIGO. They suggest that fibroblasts in drug-induced lesions have a lowered capacity to produce, and respond to, PDGF, a property not shared by fibroblasts associated with hereditary fibrosis.

• Authors: H J Wright, I L C Chapple, P Cooper, J B Matthews
• Journal: Oral diseases (Oral Dis) Vol. 12 Issue 3 Pg. 315-23 (May 2006) ISSN: 1354-523X [Print] Denmark
• PMID: 16700743 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Platelet-Derived Growth Factor
• Protein Isoforms
• RNA, Messenger
• Receptors, Platelet-Derived Growth Factor

Topics

• Adolescent
• Adult
• Aged
• Case-Control Studies
• Female
• Fibroblasts (metabolism)
• Fibromatosis, Gingival (metabolism)
• Gingiva (metabolism)
• Gingival Overgrowth (chemically induced, metabolism)
• Humans
• Immunohistochemistry
• Macrophages (metabolism)
• Male
• Middle Aged
• Platelet-Derived Growth Factor (biosynthesis)
• Protein Isoforms
• RNA, Messenger (analysis)
• Receptors, Platelet-Derived Growth Factor (biosynthesis)
• Reverse Transcriptase Polymerase Chain Reaction
• Statistics, Nonparametric