Document Detail

Immunohistochemical expression of cell differentiation and growth in neonate cardiomyocytes.
MedLine Citation:
PMID:  22886229     Owner:  NLM     Status:  Publisher    
BACKGROUND: The cardiac alterations during the fetal heart transition to extrauterine life have been explored by several animal studies and the cell mechanisms responsible for these modifications are not well documented in humans. OBJECTIVE: To evaluate the mechanism of cell differentiation into cardiomyocytes that occur in the first days of life, through immunohistochemical analysis of proteins involved in proliferation and muscle contraction processes, in samples of human neonate myocardium. METHODS: Cross-sectional study of paraffin-sample sections of myocardium from an autopsy database of human neonates, divided into two sample groups: full-term neonates who died after a maximum of two days of life (NEO1) with 10 cases, and full-term infants who died between 3 and 10 days of life (NEO2) with 14 cases, in order to follow a temporal line that would contemplate the transition from fetal circulation to extrauterine life. The samples were studied in tissue microarray and the antibodies used were Ki67, PCNA, PTEN, Bcl2 (proliferation), HHF35 and sarcomeric actin (contractile proteins). RESULTS: Difference was observed regarding Ki67, p = 0.02; HHF35, p <0.01 and sarcomeric actin, p = 0.02, with Ki67 expression being higher in NEO1 group, whereas HHF35 and sarcomeric actin expression was higher in the NEO2 group. CONCLUSION: The results suggest that cardiomyocytes have a proliferation characteristic (Ki67) in NEO1 which, following a temporal line, will be replaced by a differentiation characteristic (HHF35 and sarcomeric actin) in NEO2.
Tarcísio Fulgêncio Alves da Silva; Greyce Kelly de Souza; Mona Adalgisa Simões; Francisco Cesar Pabis; Lucia de Noronha
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-09
Journal Detail:
Title:  Arquivos brasileiros de cardiologia     Volume:  -     ISSN:  1678-4170     ISO Abbreviation:  Arq. Bras. Cardiol.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421031     Medline TA:  Arq Bras Cardiol     Country:  -    
Other Details:
Languages:  ENG; POR     Pagination:  -     Citation Subset:  -    
Pontifícia Universidade Católica do Paraná.
Vernacular Title:
Expressão imunoistoquímica de diferenciação e crescimento celular em cardiomiócitos de neonatos.
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