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J Cell Physiol. 2018 Sep;233(9):7035-7044. doi: 10.1002/jcp.26504. Epub 2018 Apr 10.

Trauma induced heterotopic ossification patient serum alters mitogen activated protein kinase signaling in adipose stem cells.

Author information

1
Department of Biological and Agricultural Engineering, Louisiana State University, Baton Rouge, Louisiana.
2
Department of Regenerative Medicine, Naval Medical Research Center, Silver Spring, Maryland.
3
Tulane University School of Medicine, Center for Stem Cell Research and Regenerative Medicine, New Orleans, Louisiana.
4
Department of Orthopaedics, Louisiana State University Health Science Center, New Orleans, Louisiana.
5
Department of Cancer Biology and Genetics, Ohio State University, Columbus, Ohio.
6
Department of Surgery, Uniformed Services University of the Health Sciences-Walter Reed National Military Medical Center, Bethesda, Maryland.
7
Departments of Medicine, Structural and Cellular Biology, & Surgery, Tulane University School of Medicine, New Orleans, Louisiana.
8
LaCell LLC, New Orleans, Louisiana.

Abstract

Post-traumatic heterotopic ossification (HO) is the formation of ectopic bone in non-osseous structures following injury. The precise mechanism for bone development following trauma is unknown; however, early onset of HO may involve the production of pro-osteogenic serum factors. Here we evaluated serum from a cohort of civilian and military patients post trauma to determine early induction gene signatures in orthopaedic trauma induced HO. To test this, human adipose derived stromal/stem cells (hASCs) were stimulated with human serum from patients who developed HO following trauma and evaluated for a gene panel with qPCR. Pathway gene analysis ontology revealed that hASCs stimulated with serum from patients who developed HO had altered gene expression in the activator protein 1 (AP1) and AP1 transcriptional targets pathways. Notably, there was a significant repression in FOS gene expression in hASCs treated with serum from individuals with HO. Furthermore, the mitogen-activated protein kinase (MAPK) signaling pathway was activated in hASCs following serum exposure from individuals with HO. Serum from both military and civilian patients with trauma induced HO had elevated downstream genes associated with the MAPK pathways. Stimulation of hASCs with known regulators of osteogenesis (BMP2, IL6, Forskolin, and WNT3A) failed to recapitulate the gene signature observed in hASCs following serum stimulation, suggesting non-canonical mechanisms for gene regulation in trauma induced HO. These findings provide new insight for the development of HO and support ongoing work linking the systemic response to injury with wound specific outcomes.

KEYWORDS:

AP1; MAPK; adipose stem cells; heterotopic ossification; osteogenesis

PMID:
29377109
DOI:
10.1002/jcp.26504

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