The present report shows that thymocyte death, induced by glucocorticoids, may be modulated in vivo by ouabain. Young, ten days old, mice injected with 140 mg/kg sodium succcinate of hydrocortisone (HC) intraperitonially (i.p.) displayed, 24 h after the injection, a decrease in thymus size and cellular content, an effect that was magnified when ouabain (OUA) 0.56 mg/kg, i.p. was given 1 h prior to the HC injection. Ouabain per se was not capable of producing these changes. Both HC and the combination OUA plus HC induced the death of immature double positive lymphocytes (CD4+CD8+) whereas CD69+ cells survived both treatments. An increase in annexin positive cells and a decrease in mitochondrial membrane potential, assessed by cytofluorimetry, using the fluorescent dye DiOC6, was observed in thymocytes from HC treated animals indicating apoptosis of these cells. Furthermore, a synergistic effect between OUA and HC was also observed using this parameter. The synergy observed in the thymus of animals treated with glucocorticoids and OUA might occur under stress, when both hormones are released, or in situations when ouabain is administered exogenously in a moment of the circadian cycle when glucocorticoid levels are elevated. However the impact of this effect on the immune response is still unknown.
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June 22 2006
Synergistic Effect Between Ouabain and Glucocorticoids for the Induction of Thymic Atrophy
Sandra Rodrigues-Mascarenhas;
Sandra Rodrigues-Mascarenhas
1Laboratório de Imunologia Tumoral, Instituto de Bioquímica Médica, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Bloco H - Sala 003, 21941-590 Rio de Janeiro, RJ, Brazil
2Biophysics Institute Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Neusa Fernandes dos Santos;
Neusa Fernandes dos Santos
1Laboratório de Imunologia Tumoral, Instituto de Bioquímica Médica, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Bloco H - Sala 003, 21941-590 Rio de Janeiro, RJ, Brazil
3Center for Structural Molecular Biotechnology (CBME/CEPID/FAPESP), Physics Institute of São Carlos, University of São Paulo, São Paulo, Brazil
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Vivian M. Rumjanek
Vivian M. Rumjanek
1Laboratório de Imunologia Tumoral, Instituto de Bioquímica Médica, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro, Bloco H - Sala 003, 21941-590 Rio de Janeiro, RJ, Brazil
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Publisher: Portland Press Ltd
Online ISSN: 1573-4935
Print ISSN: 0144-8463
© 2006 Springer Science+Business Media, Inc.
2006
Biosci Rep (2006) 26 (2): 159–169.
Citation
Sandra Rodrigues-Mascarenhas, Neusa Fernandes dos Santos, Vivian M. Rumjanek; Synergistic Effect Between Ouabain and Glucocorticoids for the Induction of Thymic Atrophy. Biosci Rep 22 June 2006; 26 (2): 159–169. doi: https://doi.org/10.1007/s10540-006-9012-1
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