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(Reference retrieved automatically from Google Scholar through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Long-Lasting Priming of Endothelial Cells by Plasma Melatonin Levels

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Author(s):
Tamura, Eduardo Koji [1] ; Fernandes, Pedro Augusto [1] ; Marcola, Marina [1] ; Cruz-Machado, Sanseray da Silveira [1] ; Markus, Regina Pekelmann [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Lab Chronopharmacol, Dept Physiol, Inst Biosci, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: PLoS One; v. 5, n. 11, p. e13958, 2010.
Web of Science Citations: 31
Abstract

Background: Endothelial cells are of great interest for cell therapy and tissue engineering. Understanding the heterogeneity among cell lines originating from different sources and culture protocols may allow more standardized material to be obtained. In a recent paper, we showed that adrenalectomy interferes with the expression of membrane adhesion molecules on endothelial cells maintained in culture for 16 to 18 days. In addition, the pineal hormone, melatonin, reduces the adhesion of neutrophils to post-capillary veins in rats. Here, we evaluated whether the reactivity of cultured endothelial cells maintained for more than two weeks in culture is inversely correlated to plasma melatonin concentration. Methodology/Principal Findings: The nocturnal levels of melatonin were manipulated by treating rats with LPS. Nocturnal plasma melatonin, significantly reduced two hours after LPS treatment, returned to control levels after six hours. Endothelial cells obtained from animals that had lower nocturnal melatonin levels significantly express enhanced adhesion molecules and iNOS, and have more leukocytes adhered than cells from animals that had normal nocturnal levels of melatonin (naive or injected with vehicle). Endothelial cells from animals sacrificed two hours after a simultaneous injection of LPS and melatonin present similar phenotype and function than those obtained fromcontrol animals. Analyzing together all the data, taking into account the plasma melatonin concentration versus the expression of adhesion molecules or iNOS we detected a significant inverse correlation. Conclusions/Significance: Our data strongly suggest that the plasma melatonin level primes endothelial cells "in vivo," indicating that the state of the donor animal is translated to cells in culture and therefore, should be considered for establishing cell banks in ideal conditions. (AU)

FAPESP's process: 07/07871-6 - Imune-pineal Axis: injury shifts melatonin production from endocrine to paracrine
Grantee:Regina Pekelmann Markus
Support Opportunities: Research Projects - Thematic Grants