Intramembranous bone matrix is osteoinductive
作者:
Caroline Kelly Scott,
Steven Douglas Bain,
James Anderson Hightower,
期刊:
The Anatomical Record
(WILEY Available online 1994)
卷期:
Volume 238,
issue 1
页码: 23-30
ISSN:0003-276X
年代: 1994
DOI:10.1002/ar.1092380104
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: Growth factors;Morphogenesis;Bone development;Bone matrix;Sprague Dawley rats;Heterotopic ossification;Affinity chromatography;Polyacrylamide gel electrophoresis
数据来源: WILEY
摘要:
AbstractAll known bone‐derived osteoinductive factors have been isolated from endochondral (EC) bones and all initiate bone induction via EC ossification. However, to date no attempt has been made to isolate comparable factors from bones which form initially and completely via intramembranous (IM) ossification. The purpose of this work was to isolate osteoinductive proteins from IM bones. To accomplish this, we extracted proteins from bovine frontal bone matrix (intramembranous origin) using methods previously described for endochondral (EC) bone matrix (i.e., femur). Bone powder (<1 mm) was decalcified and proteins extracted with 4 M guanidine hydrochloride. Ultrafiltration was used to isolate and concentrate a 10–100 kilodalton (kDa) fraction, upon which heparin‐Sepharose (HS) affinity chromatography was performed. HS‐binding (HS‐B) and non‐binding proteins (HS‐NB) were lyophilized with bovine type I collagen (Vitrogen) to form pellets which were implanted subcutaneously in rats. Radiology as well as brightfield, fluorescent, and polarizing microscopy were used to assess the formation of ectopic bone at the site of pellet implantation. In this report we demonstrate that a heparin‐Sepharose binding, osteoinductive factor can be extracted and partially purified from bovine intramembranous bone matrix. This factor has a different sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS‐PAGE) banding pattern than a comparable osteoinductive/chondroinductive factor isolated from EC bone. © 19
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