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5-Lipoxygenase-dependent apoptosis of human lymphocytes in the International Space Station: data from the ROALD experiment

Battista, Natalia and Meloni, Maria Antonia and Bari, Monica and Mastrangelo, Nicolina and Galleri, Grazia and Rapino, Cinzia and Dainese, Enrico and Finazzi Agrò, Alessandro and Pippia, Proto Gavino and Maccarrone, Mauro (2012) 5-Lipoxygenase-dependent apoptosis of human lymphocytes in the International Space Station: data from the ROALD experiment. The FASEB Journal, Vol. 26 (5), p. 1791-1798. eISSN 1530-6860. Article.

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DOI: 10.1096/fj.11-199406

Abstract

The functional adaptation of the immune system to the surrounding environment is also a fundamental issue in space. It has been suggested that a decreased number of lymphocytes might be a cause of immunosuppression, possibly due to the induction of apoptosis. Early activation of 5-lipoxygenase (5-LOX) might play a central role in the initiation of the apoptotic program. The goal of the role of apoptosis in lymphocyte depression (ROALD) experiment, flown on the International Space Station as part of the BIO-4 mission of the European Space Agency, was to ascertain the induction of apoptosis in human lymphocytes under authentic microgravity, and to elucidate the possible involvement of 5-LOX. Our results demonstrate that exposure of human lymphocytes to microgravity for 48 h onboard the ISS remarkably increased apoptotic hallmarks such as DNA fragmentation (∼3-fold compared to ground-based controls) and cleaved–poly (ADP-ribose) polymerase (PARP) protein expression (∼3-fold), as well as mRNA levels of apoptosis-related markers such as p53 (∼3-fold) and calpain (∼4-fold); these changes were paralleled by an early increase of 5-LOX activity (∼2-fold). Our findings provide a molecular background for the immune dysfunction observed in astronauts during space missions, and reveal potential new markers to monitor health status of ISS crew members.

Item Type:Article
ID Code:7628
Status:Published
Refereed:Yes
Uncontrolled Keywords:Fatty acids, immunosuppression, lipoxygenase pathway, space environment
Subjects:Area 05 - Scienze biologiche > BIO/09 Fisiologia
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze Biomediche
Publisher:The Federation of the American Societies for Experimental Biology
eISSN:1530-6860
Deposited On:28 May 2012 11:57

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