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PLoS One. 2010 Jan 5;5(1):e8576. doi: 10.1371/journal.pone.0008576.

Sonic Hedgehog gene delivery to the rodent heart promotes angiogenesis via iNOS/netrin-1/PKC pathway.

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  • 1Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio, United States of America.

Abstract

BACKGROUND:

We hypothesized that genetic modification of mesenchymal stem cells (MSCs) with Sonic Hedgehog (Shh) transgene, a morphogen during embryonic development and embryonic and adult stem cell growth, improved their survival and angiogenic potential in the ischemic heart via iNOS/netrin/PKC pathway.

METHODS/PRINCIPAL FINDINGS:

MSCs from young Fisher-344 rat bone marrow were purified and transfected with pCMV Shh plasmid ((Shh)MSCs). Immunofluorescence, RT-PCR and Western blotting showed higher expression of Shh in (Shh)MSCs which also led to increased expression of angiogenic and pro-survival growth factors in (Shh)MSCs. Significantly improved migration and tube formation was seen in (Shh)MSCs as compared to empty vector transfected MSCs ((Emp)MSCs). Significant upregulation of netrin-1 and iNOS was observed in (Shh)MSCs in PI3K independent but PKC dependent manner. For in vivo studies, acute myocardial infarction model was developed in Fisher-344 rats. The animals were grouped to receive 70 microl basal DMEM without cells (group-1) or containing 1x10(6) (Emp)MSCs (group-2) and (Shh)MSCs (group-3). Group-4 received recombinant netrin-1 protein injection into the infarcted heart. FISH and sry-quantification revealed improved survival of (Shh)MSCs post engraftment. Histological studies combined with fluorescent microspheres showed increased density of functionally competent blood vessels in group-3 and group-4. Echocardiography showed significantly preserved heart function indices post engraftment with (Shh)MSCs in group-3 animals.

CONCLUSIONS/SIGNIFICANCE:

Reprogramming of stem cells with Shh maximizes their survival and angiogenic potential in the heart via iNOS/netrin-1/PKC signaling.

PMID:
20052412
[PubMed - indexed for MEDLINE]
PMCID:
PMC2797399
Free PMC Article
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