期刊
JOURNAL OF INVERTEBRATE PATHOLOGY
卷 121, 期 -, 页码 1-6出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jip.2014.06.004
关键词
Aging; Immunity; Immunosenescence; Apis mellifera; Nosema ceranae; Resistance
类别
资金
- Biotechnology and Biological Sciences Research Council
- Leverhulme Foundation
Immunosenescence, the systemic reduction of immune efficiency with age, is increasingly recognised as having important implications for host-parasite dynamics. Changes in the immune response can impact on the ability of an individual to resist or moderate parasite infection, depending on how and when it encounters a parasite challenge. Using the European honey bee Apis mellifera and its microsporidian parasite Nosema ceranae, we investigated the effects of host age on the ability to resist parasite infection and on baseline immunocompetence, assessed by quantifying constitutive (PO) and potential levels (PPO) of the phenoloxidase immune enzyme as general measures of immune function. There was a significant correlation between the level of general immune function and infection intensity, but not with survival, and changes in immune function with age correlated with the ability of individuals to resist parasite infection. Older individuals had better survival when challenged with a parasite than younger individuals, however they also had more intense infections and lower baseline immunocomptence. The ability of older individuals to have high infection intensities yet live longer, has potential consequences for parasite transmission. The results highlight the need to consider age in host-parasite studies and show the importance of choosing the correct measure when assaying invertebrate immunity. (C) 2014 Elsevier Inc. All rights reserved.
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