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Melatonin accelerates metamorphosis in Xenopus laevis

M F Rose¹, S R Rose

¹University of Tennessee, Memphis, Department of Pediatrics, 38103, USA.

Journal of Pineal Research

|March 24, 1998

Summary

Continuous darkness delays metamorphosis in tadpoles, contrary to expectations. Melatonin and certain drugs were found to accelerate this process, suggesting complex hormonal regulation rather than melatonin

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Area of Science:

Endocrinology
Developmental Biology
Amphibian Research

Background:

Continuous dark (DD) conditions are associated with delayed metamorphosis and larger body size in Woodhousei fowleri tadpoles.
The precise mechanism by which DD influences metamorphosis remains unclear.

Purpose of the Study:

To investigate the role of light-cycle exposure and specific hormones/drugs in regulating amphibian metamorphosis.
To test the hypothesis that melatonin and elevated prolactin (Prl) delay metamorphosis.

Main Methods:

Xenopus laevis tadpoles were exposed to light/dark (LD), DD, or continuous light (LL) conditions.
Subgroups received thyroxine (T4), melatonin, bromocriptine (Bro), or haloperidol (Hal) treatments.
Metamorphosis progression, body size, and developmental stages were monitored.

Main Results:

DD delayed metamorphosis, while LL did not; T4 accelerated metamorphosis, counteracting DD effects.
Contrary to the hypothesis, melatonin accelerated metamorphosis and reduced body size in LD/LL conditions.
Melatonin and haloperidol accelerated metamorphosis, while bromocriptine delayed it; DD tadpoles treated with T4 or melatonin showed increased size.

Conclusions:

Delayed metamorphosis in DD is not due to increased melatonin production.
Melatonin and haloperidol accelerate metamorphosis in Xenopus laevis.
Melatonin's effect on metamorphosis may involve alterations in prolactin concentration.

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