title: Extending the time window of mammalian heart regeneration by thymosin beta 4.
abstract: Recent studies demonstrated that the heart of 1-day-old neonatal mice could regenerate, with Wt1(+) EPDCs migrating into myocardial regions after partial surgical resection, but this capacity was lost by 7 days of age. By treatment with Tβ4 to maintain Wt1 expression and retain the migrating feature of EPDCs in neonatal mice, we explored the possibility of restoring the cardiac regeneration potential of mice. We intraperitoneally injected Tβ4 into 1-day-old mice on daily basis and then apical resection was performed on the mice 7 days later. Twenty one days after the resection, morphological analysis revealed that the Tβ4-treated mice regenerated the resected ventricular apex, while the mice in PBS control group developed significant fibrosis without apical regeneration. The Tβ4-treated mice had significantly better ventricular ejection fraction and fractional shortening than controls. During the process of regeneration, Wt1(+) EPDCs migrated into myocardial region and some of them expressed Islet1 and the markers for mature cardiomyocytes, such as cTnT and SαA. These characteristics of Wt1(+) EPDCs were also seen in the heart regeneration of mice subjected to apical resection 1 day after birth. Tβ4 has no essential effect on cell cycle activity as no disruption of actin filaments was observed in Tβ4-treated hearts. These results revealed that the cardiac regeneration potential of neonatal mice could be extended to the 7th post-natal day by Tβ4 and Wt1(+) EPDCs mobilization might play an important role in the extension.
authors.affiliation: State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
authors.forename: Liu
authors.initials: L
authors.lastname: Rui
authors.forename: Nie
authors.initials: N
authors.lastname: Yu
authors.forename: Lian
authors.initials: L
authors.lastname: Hong
authors.forename: He
authors.initials: H
authors.lastname: Feng
authors.forename: Han
authors.initials: H
authors.lastname: Chunyong
authors.forename: Meng
authors.initials: M
authors.lastname: Jian
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhe
authors.forename: Hu
authors.initials: H
authors.lastname: Shengshou
mesh_terms: D000185:Actinin / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn; D002465:Cell Movement / Q000187:drug effects; D004452:Echocardiography; D007274:Injections, Intraperitoneal; D051379:Mice; D018613:Microscopy, Confocal; D032383:Myocytes, Cardiac / Q000378:metabolism / Q000502:physiology*; D010496:Pericardium / Q000166:cytology / Q000378:metabolism / Q000502:physiology*; D012038:Regeneration / Q000187:drug effects*; D012518:Sarcomeres / Q000378:metabolism; D013318:Stroke Volume / Q000502:physiology; D013947:Thymosin / Q000008:administration & dosage / Q000494:pharmacology*; D013997:Time Factors; D020107:Troponin T / Q000378:metabolism; D025721:WT1 Proteins / Q000378:metabolism; D000099201:Thymosin beta(4)
chemical_list: D000185:Actinin; D013947:Thymosin; D020107:Troponin T; D025721:WT1 Proteins; D000099201:Thymosin beta(4)
keywords: EPDCs; Tβ4; cardiac regeneration; neonatal mouse