Long-Lived Termite Queens Exhibit High Cu/Zn-Superoxide Dismutase Activity
Eisuke Tasaki1,2,3, Kazuya Kobayashi4, Kenji Matsuura1
1Laboratory of Insect Ecology, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Kyoto 606-8502, Japan.
Oxidative Medicine and Cellular Longevity
|April 12, 2018
Summary
Termite queens live longer due to higher superoxide dismutase (SOD) activity, linked to copper cofactor levels, not gene expression. This enzyme activity contributes to their extraordinary longevity.
Area of Science:
- Encompasses enzymology, oxidative stress biology, and aging research.
Background:
- Superoxide dismutases (SODs) are key antioxidant enzymes regulating reactive oxygen species (ROS), implicated in aging.
- Eusocial insect queens, like termites, display remarkable longevity compared to workers, offering insights into aging mechanisms.
Purpose of the Study:
- To investigate the association between SOD activity and the extraordinary longevity of termite queens.
- To explore the role of gene expression and cofactor availability in SOD activity differences between queens and workers.
Main Methods:
- Comparative analysis of Cu/Zn-SOD activity between termite queens and workers.
- RNA sequencing to identify SOD gene sequences in *Reticulitermes speratus*.
- Quantification of copper concentrations in queens and workers.
Main Results:
- Termite queens exhibit significantly higher Cu/Zn-SOD activity than nonreproductive individuals.
- No significant differences were observed in the gene expression levels of *RsSOD1* and *RsSOD3A* between queens and workers.
- Queens possess higher concentrations of copper, an essential cofactor for Cu/Zn-SOD.
Conclusions:
- The elevated Cu/Zn-SOD activity in termite queens is primarily attributed to higher copper cofactor levels, rather than differential gene expression.
- Cu/Zn-SOD activity, influenced by cofactor availability, plays a crucial role in the exceptional longevity of termite queens.
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