MELATONIN STIMULATES PHOTORECEPTOR DIFFERENTIATION IN REGENERATION OF PLANARIAN SCHMIDTEA MEDITERRANEA

THEORY AND PRACTICE OF PARASITIC DISEASE CONTROL Pub Date : 2023-04-17 DOI:10.31016/978-5-6048555-6-0.2023.24.229-234

N. Kreshchenko, D. E. Mitkovskii

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Abstract

The planarian Schmidtea mediterranea (Turbellaria, Platyhelminthes) has a pair of eyes on the anterior part of the body consisting of pigment cells and photoreceptor neurons capable of regeneration. The research represents a study of the effects of melatonin on photoreceptor differentiation after decapitation of the planarian. During the experiment, the worms were decapitated, and the eye regeneration was observed at days 3 and 4 of the regeneration. Different stages of the photoreceptor regeneration were observed such as both eyes in the regenerating planarians, planarians with one eye, and planarians with no eyes. In most of the animals, the photoreceptors were already visible at day 4 after the decapitation. In the experimental planarians exposed to melatonin at concentrations of 1 and 0.1 µM, the accelerated photoreceptor differentiation was observed. The stimulating effects of melatonin were detected in three animal groups on day 3 and 4 after the decapitation. The study will be continued to evaluate mechanisms of the melatonin action on planarian regeneration.

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褪黑素刺激地中海涡虫再生中的光感受器分化

地中海涡虫(Turbellaria, platyhelmintes)在身体前部有一对眼睛，由色素细胞和具有再生能力的光感受器神经元组成。该研究代表了褪黑素对涡虫斩首后光感受器分化的影响的研究。实验过程中，取虫头，在再生后第3天和第4天观察眼再生情况。观察了再生涡虫的光感受器再生的不同阶段，如双眼再生涡虫、单眼再生涡虫和无眼再生涡虫。在大多数动物中，在斩首后的第4天，光感受器已经可见。在暴露于浓度为1和0.1µM的褪黑激素的实验涡虫中，观察到光感受器的加速分化。褪黑素对三组大鼠的刺激作用分别在断头后第3天和第4天进行。研究将继续评估褪黑素对涡虫再生的作用机制。

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THEORY AND PRACTICE OF PARASITIC DISEASE CONTROL

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