Abstract
Regeneration is a multifaceted biological phenomenon that necessitates the intricate orchestration of apoptosis, stem cells, and immune responses, culminating in the regulation of apoptosis-induced compensatory proliferation (AICP). The AICP context of research is observed in many animal models like in Hydra, Xenopus, newt, Drosophila, and mouse but so far not reported in earthworm. The earthworm Perionyx excavatus is used in the present study to understand the relationship between AICP-related protein expression and regeneration success in different conditions (normal regeneration and abnormal multiple bud formation). Initially, the worms are amputated into five equal portions and it is revealed that regeneration in P. excavatus is clitellum independent and it gives more preference for anterior regeneration (regrowth of head portion) than for posterior regeneration (regrowth of tail portion). The posterior segments of the worm possess enormous regeneration ability but this is lacking in anterior segments. Alkaline phosphate, a stem cell marker, shows strong signals throughout all the posterior segments but it decreases in the initial 1st to 15th anterior segments which lack the regeneration ability. While regenerating normally, it was suggested that the worm follow AICP principles. This is because there was increased expression of apoptosis signals throughout the regeneration process along with constant expression of stem cell proliferation response together with cellular proliferation. In amputated posterior segments maintained in vitro, the apoptosis signals were extensively detected on the 1st day. However, on the 4th and 6th days, caspase-3 and H2AX expression are significantly suppressed, which may eventually alter the Wnt3a and histone H3 patterns that impair the AICP and result in multiple bud formation. Our results suggest that AICP-related protein expression pattern is crucial for initiating proper regeneration.
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Acknowledgements
The authors express their gratitude to the International Research Centre (IRC) of Sathyabama Institute of Science and Technology, located in Chennai, for their invaluable support in facilitating the execution of the research endeavors.
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This work was supported by the DST-SHRI-INDIA (DST/TDT/SHRI-24/2021 (G)).
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KR was contributing in writing the original draft, conceptualization, data collection, and figures; JDSC was involved in the writing original draft, conceptualization, investigation, supervision, and project administration; JRS was involved in the investigation and project administration; KSC, PD, AR, CV, and NSMC were involved in the data curation and language editing.
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Rajagopalan, K., Christyraj, J.D.S., Chelladurai, K.S. et al. The molecular mechanisms underlying the regeneration process in the earthworm, Perionyx excavatus exhibit indications of apoptosis-induced compensatory proliferation (AICP). In Vitro Cell.Dev.Biol.-Animal 60, 222–235 (2024). https://doi.org/10.1007/s11626-023-00843-6
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DOI: https://doi.org/10.1007/s11626-023-00843-6