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Long-Lived Termite Queens Exhibit High Cu/Zn-Superoxide Dismutase Activity
- E. Tasaki, Kazuya Kobayashi, K. Matsuura, Y. Iuchi
- Biology, MedicineOxidative medicine and cellular longevity
- 13 February 2018
It is found that queens have higher Cu/Zn-SOD activity than nonreproductive individuals of the termite Reticulitermes speratus, and results suggest that the high Cu/ Zn- SOD activity of termite queens is related to their high levels of the cofactor rather than gene expression.
Uric acid, an important antioxidant contributing to survival in termites
- E. Tasaki, Hiroki Sakurai, Masaru Nitao, K. Matsuura, Y. Iuchi
- Biology, MedicinePloS one
- 13 June 2017
It is demonstrated that the accumulation of uric acid considerably increases the free radical-scavenging activity and resistance against ultraviolet-induced oxidative stress in laboratory-maintained termites and is an essential antioxidant for survival and contributes significantly to longevity.
Hypoxia adaptation in termites: hypoxic conditions enhance survival and reproductive activity in royals
It is shown that hypoxia, possibly an important environmental factor in the nests, enhances survival and reproductive activity in incipient royals of the subterranean termite Reticulitermes speratus compared with those in control conditions, and this study provides novel insights into the effect of a nest environment on the reproductive characteristics in termite royals.
An Efficient Antioxidant System in a Long-Lived Termite Queen
It is shown that queens of the termite Reticulitermes speratus incur significantly lower oxidative damage to DNA, protein and lipid and have higher activity of antioxidant enzymes than non-reproductive individuals (workers and soldiers).
High expression of the breast cancer susceptibility gene BRCA1 in long-lived termite kings
- E. Tasaki, Yuki Mitaka, T. Nozaki, Kazuya Kobayashi, K. Matsuura, Y. Iuchi
- Biology, MedicineAging
- 1 October 2018
This study demonstrated that termite kings express higher levels of the breast cancer susceptibility gene BRCA1 than other castes, and revealed that some of the highly expressed king-specific genes were significantly upregulated in reproductive tissue (testis) compared to their expression in somatic tissue (fat body).
Reproduction deep inside wood: a low O2 and high CO2 environment promotes egg production by termite queens
It is demonstrated that royal chambers in termite nests have low O2 and high CO2 gas concentrations, which enhance egg production by queens, which highlights the adaptation of animals that live in closed habitats, which are hypoxic and hypercapnic as the result of their own metabolism, so as to have a high fitness in such environmental conditions.
Protective role of testis-specific peroxiredoxin 4 against cellular oxidative stress
- E. Tasaki, S. Matsumoto, +5 authors Y. Iuchi
- Chemistry, MedicineJournal of clinical biochemistry and nutrition
- 1 May 2017
It is demonstrated that PRDX4t plays a protective role against oxidative stress in the mammalian cell line HEK293T and plays an important role in cellular antioxidant defense.
Transcriptomic analysis of epigenetic modification genes in the termite Reticulitermes speratus
- Yuki Mitaka, E. Tasaki, T. Nozaki, T. Fuchikawa, Kazuya Kobayashi, K. Matsuura
- Medicine, BiologyInsect science
- 11 October 2018
Findings imply that epigenetic modification plays important roles in the gamete production process in termite kings and queens, particularly in the king's testis and queen's ovary.
Why and how do termite kings and queens live so long?
- E. Tasaki, M. Takata, K. Matsuura
- MedicinePhilosophical Transactions of the Royal Society B
- 8 March 2021
Current ecological and physiological studies on ageing are highlighted and the various possible evolutionary and molecular explanations of the extended lifespans of termite reproductives are discussed to integrate these findings into a coherent framework revealing the evolution of longevity in these Reproductives.
A non-invasive method for sexing first and second instar larvae of termites using external morphology
The morphological sexing presented here has broad applicability in studies addressing sex differences in development, caste differentiation, and behavior, and will contribute to understanding why both sexes co-exist in a termite society and allocate tasks, and which tasks are completely compensable by the other sex, thereby deepening the understanding of social systems where both sexes engage in tasks.