Molecular and Cellular Biochemistry

, Volume 299, Issue 1–2, pp 99–107 | Cite as

Enhanced expression of adipocyte-type fatty acid binding protein in murine lymphocytes in response to dexamethasone treatment

  • Soha Abdelkawi Abdelwahab
  • Yuji Owada
  • Noriko Kitanaka
  • Anne Adida
  • Hiroyuki Sakagami
  • Masao Ono
  • Makoto Watanabe
  • Friedrich Spener
  • Hisatake Kondo
Article

Abstract

Fatty acids have a great influence on the process of lymphocyte apoptosis which is considered as a modulating factor of immune response in both humans and animals. However the mechanism underlying the function of fatty acids in the process of lymphocyte apoptosis is not fully understood. In this study we show that the appearance of adipocyte-type fatty acid binding protein (A-FABP) is induced upon administration of dexamethasone (DEX) in both in vivo and cultured lymphocytes, and its distinct nuclear localization occurs in close relation to the DEX-induced apoptosis process. In immuunohistochemistry of mouse spleen, A-FABP-immunoreactivity starts to occur 3 h after DEX stimulation, and it massively localizes in the nucleus 8 h after the treatment, while no A-FABP-immunoreactivity is discerned in the lymphocytes of normal as well as 24 h post-injection spleen. In the murine T-cell leukemia CTLL-2 cells, A-FABP-immunoreactivity is also induced in both of the cytoplasm and nucleus when the apoptosis is induced by IL-2 retrieval together with DEX treatment, while in the presence of IL-2 A-FABP-immunoreactivity is confined to the cytoplasm with DEX trreatment. On the other hand, A-FABP-immunoreactivity is not detected by IL-2 retrieval alone. The present findings altogether suggest that A-FABP and its ligands, fatty acids, play an important role in the process of apoptosis and the immune modulation induced by DEX.

Keywords

fatty acid binding protein lymphocyte apoptosis dexamethazone 

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Soha Abdelkawi Abdelwahab
    • 1
  • Yuji Owada
    • 1
    • 5
  • Noriko Kitanaka
    • 1
    • 3
  • Anne Adida
    • 4
  • Hiroyuki Sakagami
    • 1
  • Masao Ono
    • 2
  • Makoto Watanabe
    • 3
  • Friedrich Spener
    • 4
  • Hisatake Kondo
    • 1
  1. 1.Division of Histology, Department of Cell Biology, Graduate School of Medical ScienceTohoku UniversityTohokuJapan
  2. 2.Department of Pathology, Graduate School of Medical ScienceTohoku UniversityTohokuJapan
  3. 3.Department of Aging and Geriatric DentistryGraduate School of Dentistry, Tohoku UniversityTohokuJapan
  4. 4.Department of BiochemistryUniversity of MuensterMuensterGermany
  5. 5.Division of Histology, Department of Cell Biology, Graduate School of Medical ScienceTohoku UniveristyTohokuJapan

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