The Journal of Bone and Joint Surgery (American) 86:80-91 (2004)
© 2004 The Journal of Bone and Joint Surgery, Inc.
Retroviral Delivery of Noggin Inhibits the Formation of Heterotopic Ossification Induced by BMP-4, Demineralized Bone Matrix, and Trauma in an Animal Model
David Hannallah, MD, MSc1,
Hairong Peng, MD, PhD1,
Brett Young, BSc1,
Arvydas Usas, MD1,
Brian Gearhart, BSc1 and
Johnny Huard, PhD1
1 Department of Orthopaedic Surgery (D.H., H.P., A.U., and J.H.) and Departments
of Molecular Genetics and Biochemistry and BioEngineering (J.H.), University
of Pittsburgh; Growth and Development Laboratory (D.H., H.P., B.Y, A.U., B.G.,
and J.H.), Children's Hospital of Pittsburgh, 4100 Rangos Research Center,
3705 Fifth Avenue, Pittsburgh, PA 15213-2582. E-mail address for J. Huard:
jhuard{at}pitt.edu
Investigation performed at the Department of Orthopaedic Surgery,
University of Pittsburgh, School of Medicine, Pittsburgh, and the Growth and
Development Laboratory, Children's Hospital of Pittsburgh, Pittsburgh,
Pennsylvania
In support of their research or preparation of this manuscript, one or more
of the authors received grants or outside funding from the National Institutes
of Health (R01-DE 13420-01A2-JH) as well as the William F. and Jean W.
Donaldson endowed chair at the Children's Hospital of Pittsburgh, the Henry J.
Mankin endowed chair at the University of Pittsburgh, and the Hirtzel
Foundation. None of the authors received payments or other benefits or a
commitment or agreement to provide such benefits from a commercial entity. No
commercial entity paid or directed, or agreed to pay or direct, any benefits
to any research fund, foundation, educational institution, or other charitable
or nonprofit organization with which the authors are affiliated or
associated.
This paper was the winner of the American Orthopaedic Association-Zimmer
Travel Award for Orthopaedic Residents, 2002.
Background: The heterotopic ossification of muscles, tendons, and
ligaments is a common problem faced by orthopaedic surgeons. We investigated
the ability of Noggin (a BMP [bone morphogenetic protein] antagonist) to
inhibit heterotopic ossification.
Methods: Part 1: A retroviral vector carrying the gene encoding
human Noggin was developed and used to transduce muscle-derived stem cells.
Part 2: Cells transduced with BMP-4 were implanted into both hind limbs of
mice along with either an equal number, twice the number, or three times the
number of Noggin-expressing muscle-derived stem cells (treated limb) or with
nontransduced muscle-derived stem cells (control limb). At four weeks, the
mice were killed and radiographs were made to look for evidence of heterotopic
ossification. Part 3: Eighty milligrams of human demineralized bone matrix was
implanted into the hind limbs of SCID (severe combined immunodeficiency
strain) mice along with 100,000, 500,000, or 1,000,000 Noggin-expressing
muscle-derived stem cells (treated limbs) or nontransduced muscle-derived stem
cells (control limbs). At eight weeks, the mice were killed and radiographs
were made. Part 4: Immunocompetent mice underwent bilateral Achilles tenotomy
along with the implantation of 1,000,000 Noggin-expressing muscle-derived stem
cells (treated limbs) or nontransduced muscle-derived stem cells (control
limbs). At ten weeks, the mice were killed and radiographs were made.
Results: Part 1: An in vitro BMP inhibition assay demonstrated that
Noggin was expressed by muscle-derived stem cells at a level of 280 ng per
million cells per twenty-four hours. Part 2: Three varying doses of
Noggin-expressing muscle-derived stem cells inhibited the heterotopic
ossification elicited by BMP-4-expressing muscle-derived stem cells.
Heterotopic ossification was reduced in a dose-dependent manner by 53%, 74%,
and 99%, respectively (p < 0.05). Part 3: Each of three varying doses of
Noggin-expressing muscle-derived stem cells significantly inhibited the
heterotopic ossification elicited by demineralized bone matrix. Heterotopic
ossification was reduced by 91%, 99%, and 99%, respectively (p < 0.05).
Part 4: All eleven animals that underwent Achilles tenotomy developed
heterotopic ossification at the site of the injury in the control limbs. In
contrast, the limbs treated with the Noggin-expressing muscle-derived stem
cells had a reduction in the formation of heterotopic ossification of 83% and
eight of the eleven animals had no radiographic evidence of heterotopic
ossification (p < 0.05).
Conclusions: The delivery of Noggin mediated by muscle-derived stem
cells can inhibit heterotopic ossification caused by BMP-4, demineralized bone
matrix, and trauma in an animal model.
Clinical Relevance: Gene therapy to deliver Noggin may become a
powerful method to inhibit heterotopic ossification in targeted areas of the
body.

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