Hibernation is associated with depression of T-cell independent humoral immune responses in the 13-lined ground squirrel

Hjalmar R. Bouma*, Robert H. Henning, Frans G. M. Kroese, Hannah V. Carey

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

Mammalian hibernation consists of periods of low metabolism and body temperature (torpor), interspersed by euthermic arousal periods. The function of both the innate and adaptive immune system is suppressed during hibernation. In this study, we analyzed the humoral adaptive immune response to a T-cell independent (TI-2) and a T-cell dependent (TD) antigen. Thirteen-lined ground squirrels were immunized in summer or during hibernation with either a TI-2 or TD antigen on day 0 and day 14. Blood was drawn on day 0, 7, 14, 21 and 28. Both types of antigens induced a significant rise in antibody titer in summer animals. Much to our surprise, however, only immunization with the TD antigen, and not with the TI-2 antigen induced a humoral response in hibernators. Flow cytometric analysis of CD4 (helper T-lymphocytes), CD8 (cytotoxic T-lymphocytes) and CD45RA (B-lymphocytes) in blood, spleen and lymph nodes ruled out massive apoptosis as explanation of the absent TI humoral response during hibernation. Rather, reduced TI-2 stimulation of B-lymphocytes, possibly due to lowered serum complement during torpor, may explain the reduced antibody production in response to a TI-2 antigen. These results demonstrate that hibernation diminishes the capacity to induce a TI-2 humoral immune response, while the capacity to induce a humoral response to a TD antigen is maintained. (C) 2012 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)154-160
Number of pages7
JournalDevelopmental and comparative immunology
Volume39
Issue number3
DOIs
Publication statusPublished - Mar-2013

Keywords

  • Immunology
  • Antibody
  • Squirrel
  • Ficoll
  • Ovalbumin
  • Lymphocyte
  • WHITE-NOSE SYNDROME
  • MARGINAL ZONE MACROPHAGES
  • ANTIBODY-RESPONSES
  • MAMMALIAN HIBERNATION
  • TYPE-2 ANTIGENS
  • ANNUAL CYCLE
  • IN-VIVO
  • BLOOD
  • COMPLEMENT
  • MODULATION

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