Estrogen-dependent actions of bone morphogenetic protein-7 on spine fusion in rats.

Abstract:

STUDY DESIGN:Intertransverse process spinal fusion using recombinant human bone morphogenetic protein-7 (rhBMP-7) was performed in intact and ovariectomized female rats. OBJECTIVES:To examine fusion rates in intact and ovariectomized female rats using rhBMP-7 to determine if spine fusion is dependent on estrogen status. SUMMARY OF BACKGROUND DATA:Rat spinal fusion has been established as a consistent, efficient model for posterolateral intertransverse process fusion. Previous experiments have confirmed the efficacy of pellets containing the carrier, insoluble collagen bone matrix (ICBM), and rhBMP-7 to augment intertransverse process single level fusion in a rat model. Studying these implications in an osteoporosis model is of clinical value because there are many patients undergoing spinal fusion surgery that have osteoporotic bone disease, and there is a steady increase in this group of patients. METHODS:A total of 15 ovariectomized and 15 intact Sprague-Dawley female rats were randomly assigned to groups receiving 25 mg ICBM alone, 25 mg ICBM + 10 microg rhBMP-7, and 25 mg ICBM + 30 microg rhBMP-7. Spinal fusion was evaluated by manual motion testing at each lumbar segment, radiographic evaluation using the Lenke grading system, and histology. RESULTS:Ovariectomized and intact rats receiving 25 mg carrier ICBM alone did not show spinal fusion. With 25 mg ICBM + 10 microg rhBMP-7, there was not a significant difference in fusion rates between intact and ovariectomized rats (P = 0.63). Ovariectomized rats receiving 25 mg ICBM + 30 microg rhBMP-7 showed significantly lower fusion rates than intact rats (P = 0.013). CONCLUSION:These data suggest that spinal fusion using rhBMP-7 is estrogen-dependent in rats. At the dosages used, rhBMP-7 was unable to overcome the inhibitory effects of estrogen deficiency on spinal fusion.

journal_name

Spine (Phila Pa 1976)

journal_title

Spine

authors

Moazzaz P,Gupta MC,Gilotra MM,Gilotra MN,Maitra S,Theerajunyaporn T,Chen JL,Reddi AH,Martin RB

doi

10.1097/01.brs.0000172230.01655.55

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

1706-11

issue

15

eissn

0362-2436

issn

1528-1159

pii

00007632-200508010-00005

journal_volume

30

pub_type

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