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Specific inhibition of HDAC4 in cardiac progenitor cells enhances myocardial repairs.

ABSTRACT: We have recently shown that in vivo inhibition of histone deacetylase (HDAC) stimulates endogenous myocardial regeneration in infarcted hearts (Zhang L et al. J Pharmacol Exp Ther 341: 285-293, 2012). Furthermore, our observation demonstrates that HDAC inhibition promotes cardiogenesis, which is associated with HDAC4 reduction. However, it remains unknown as to whether specific inhibition of HDAC4 modulates cardiac stem cells (CSCs) to facilitate myocardial repair and to preserve cardiac performance. c-kit(+) CSCs were isolated from adult mouse hearts and were transfected with HDAC4 siRNA to knockdown HDAC4 of c-kit(+) CSCs. The transfection of HDAC4 siRNA caused a marked reduction of HDAC4 mRNA and proteins in c-kit(+) CSCs. Mouse myocardial infarction (MI) was created to assess the effect of HDAC4 inhibition in c-kit(+) CSCs on myocardial regeneration in vivo when cells were introduced into MI hearts. Transplantation of HDAC4 siRNA-treated c-kit(+) CSCs into MI hearts improved ventricular function, attenuated ventricular remodeling, and promoted CSC-derived regeneration and neovascularization. Furthermore, Ki67 and BrdU positively proliferative myocytes increased in MI hearts receiving HDAC4 siRNA-treated c-kit(+) CSCs compared with MI hearts engrafted with control siRNA-treated c-kit(+) CSCs. In addition, compared with MI hearts engrafted with control adenoviral GFP-infected c-kit(+) CSCs, MI hearts receiving adenoviral HDAC4-infected c-kit(+) CSCs exhibited attenuated cardiac functional recovery, CSC-derived regeneration, and neovascularization, which was accompanied with adverse ventricular remodeling and decrease in Ki67 and BrdU positively proliferative myocytes. HDAC4 inhibition facilitated c-kit(+) CSCs into the differentiation into cardiac lineage commitments in vitro, while HDAC4 overexpression attenuated c-kit(+) CSC-derived cardiogenesis. Our results indicate that HDAC4 inhibition promotes CSC-derived cardiac regeneration and improves the restoration of cardiac function.

SUBMITTER: Zhang LX

PROVIDER: S-EPMC4137141 | biostudies-literature | 2014 Aug

REPOSITORIES: biostudies-literature

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Specific inhibition of HDAC4 in cardiac progenitor cells enhances myocardial repairs.

Zhang Ling X LX DeNicola Megan M Qin Xin X Du Jianfeng J Ma Julio J Tina Zhao Yu Y Zhuang Shougang S Liu Paul Y PY Wei Lei L Qin Gangjian G Tang Yaoliang Y Zhao Ting C TC

American journal of physiology. Cell physiology 20140618 4

We have recently shown that in vivo inhibition of histone deacetylase (HDAC) stimulates endogenous myocardial regeneration in infarcted hearts (Zhang L et al. J Pharmacol Exp Ther 341: 285-293, 2012). Furthermore, our observation demonstrates that HDAC inhibition promotes cardiogenesis, which is associated with HDAC4 reduction. However, it remains unknown as to whether specific inhibition of HDAC4 modulates cardiac stem cells (CSCs) to facilitate myocardial repair and to preserve cardiac perform ...[more]

PMID: 24944198

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Project description:BackgroundFunctional decline in stem cell-mediated regeneration contributes to aging associated with cellular senescence in c-kit+ cardiac progenitor cells (CPCs). Clinical implementation of CPC-based therapy in elderly patients would benefit tremendously from understanding molecular characteristics of senescence to antagonize aging. Nucleostemin (NS) is a nucleolar protein regulating stem cell proliferation and pluripotency.ObjectivesThis study sought to demonstrate that NS preserves characteristics associated with "stemness" in CPCs and antagonizes myocardial senescence and aging.MethodsCPCs isolated from human fetal (fetal human cardiac progenitor cell [FhCPC]) and adult failing (adult human cardiac progenitor cell [AhCPC]) hearts, as well as young (young cardiac progenitor cell [YCPC]) and old mice (old cardiac progenitor cell [OCPC]), were studied for senescence characteristics and NS expression. Heterozygous knockout mice with 1 functional allele of NS (NS+/-) were used to demonstrate that NS preserves myocardial structure and function and slows characteristics of aging.ResultsNS expression is decreased in AhCPCs relative to FhCPCs, correlating with lowered proliferation potential and shortened telomere length. AhCPC characteristics resemble those of OCPCs, which have a phenotype induced by NS silencing, resulting in cell flattening, senescence, multinucleated cells, decreased S-phase progression, diminished expression of stemness markers, and up-regulation of p53 and p16. CPC senescence resulting from NS loss is partially p53 dependent and is rescued by concurrent silencing of p53. Mechanistically, NS induction correlates with Pim-1 kinase-mediated stabilization of c-Myc. Engineering OCPCs and AhCPCs to overexpress NS decreases senescent and multinucleated cells, restores morphology, and antagonizes senescence, thereby preserving phenotypic properties of "stemness." Early cardiac aging with a decline in cardiac function, an increase in senescence markers p53 and p16, telomere attrition, and accompanied CPC exhaustion is evident in NS+/- mice.ConclusionsYouthful properties and antagonism of senescence in CPCs and the myocardium are consistent with a role for NS downstream from Pim-1 signaling that enhances cardiac regeneration.

Project description:ObjectivesThe goal of this study was to demonstrate the enhancement of human cardiac progenitor cell (hCPC) reparative and regenerative potential by genetic modification for the treatment of myocardial infarction.BackgroundRegenerative potential of stem cells to repair acute infarction is limited. Improved hCPC survival, proliferation, and differentiation into functional myocardium will increase efficacy and advance translational implementation of cardiac regeneration.MethodshCPCs isolated from the myocardium of heart failure patients undergoing left ventricular assist device implantation were engineered to express green fluorescent protein (hCPCe) or Pim-1-GFP (hCPCeP). Functional tests of hCPC regenerative potential were performed with immunocompromised mice by using intramyocardial adoptive transfer injection after infarction. Myocardial structure and function were monitored by echocardiographic and hemodynamic assessment for 20 weeks after delivery. hCPCe and hCPCeP expressing luciferase were observed by using bioluminescence imaging to noninvasively track persistence.ResultshCPCeP exhibited augmentation of reparative potential relative to hCPCe control cells, as shown by significantly increased proliferation coupled with amelioration of infarction injury and increased hemodynamic performance at 20 weeks post-transplantation. Concurrent with enhanced cardiac structure and function, hCPCeP demonstrated increased cellular engraftment and differentiation with improved vasculature and reduced infarct size. Enhanced persistence of hCPCeP versus hCPCe was revealed by bioluminescence imaging at up to 8 weeks post-delivery.ConclusionsGenetic engineering of hCPCs with Pim-1 enhanced repair of damaged myocardium. Ex vivo gene delivery to modify stem cells has emerged as a viable option addressing current limitations in the field. This study demonstrates that efficacy of hCPCs from the failing myocardium can be safely and significantly enhanced through expression of Pim-1 kinase, setting the stage for use of engineered cells in pre-clinical settings.

Project description:BACKGROUND:Our study sought to investigate the therapeutic effects and mechanisms of miR-326-5p-overexpressing endothelial progenitor cells (EPCs) on acute myocardial infarction (AMI). METHODS:Mouse EPCs were isolated, purified, and identified by flow cytometry and uptake of DiI-ac-LDL. The target gene of miR-326-5p was predicted using target prediction algorithms and verified by dual-luciferase reporter assay, RT-qPCR, and Western blot. After EPCs were transfected with the agomir or antagomir of miR-326-5p, tube formation assay and Matrigel plug angiogenesis assay were conducted in four groups (NC, miR-326-5p agomir, miR-326-5p antagomir, and miR-326-5p agomir+Wnt1 agonist). In addition, a mouse model of MI was established and treated with the injection of miR-326-5p-EPCs, miR-326-5p-EPCs+ Wnt1 agonist, EPCs-NC, or PBS/control into the peri-infarcted myocardium. Subsequently, cardiac function was monitored by echocardiography at 7 and 28?days postoperatively. Finally, the infarcted hearts were collected at 28?days, and the size of myocardial infarction was measured by Masson's trichrome staining and the neovascularization in the peri-infarcted area was examined through immunofluorescence staining. RESULTS:Luciferase reporter assay indicated that Wnt1 was a direct target of miR-326-5p. Using RT-qPCR and Western blot analysis, we further demonstrated that the expression level of Wnt1 was negatively correlated with miR-326-5p expression in EPCs. Both in vitro study of tube formation assay and in vivo investigation of subcutaneous Matrigel plug assay revealed that the miR-326-5p agomir could significantly enhance the angiogenic capacity of EPCs, and this effect was partially inhibited by Wnt1 agonist. Meanwhile, miR-326-5p antagomir could obviously reduce the the angiogenic capacity of EPCs in vivo compared with that in the NC group. Moreover, the transplantation of miR-326-5p-overexpressing EPCs in the ischemic hearts of mice significantly enhanced the angiogenesis in the peri-infarcted zone and improved the cardiac function. However, the enhanced capacity of angiogenesis of miR-326-5p-overexpressing EPCs was remarkably neutralized by Wnt1 agonist, accompanied by the decreased improvement in cardiac function. CONCLUSION:miR-326-5p significantly enhanced the angiogenic capacity of EPCs. Transplantation of miR-326-5p-overexpressing EPCs improved cardiac function for AMI therapy, which can be a novel strategy for enhancing therapeutic angiogenesis in ischemic heart diseases.

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Specific inhibition of HDAC4 in cardiac progenitor cells enhances myocardial repairs.

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Specific inhibition of HDAC4 in cardiac progenitor cells enhances myocardial repairs.

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