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Studies on the effect of monoamine antagonists on the morphogenesis of the newt
1Department of Biology, University of Turku, Finland.
Abstract:
The effects of three monoamine antagonists, p-chlorophenylalanine, diethyldithiocarbamate and propranolol on the morphogenesis of newt embryos were studied. Antagonists were administered during late blastula through neurula stages. In a concentration of 1 mM, all three arrested gastrulation and caused disintegration of the embryos. Lower concentrations (0.1-0.5 mM) retarded morphogenetic movements in the gastrulation and caused malformations especially in the anterior parts of the embryos; pigmentation was delayed by 1 or 2 days. In addition, p-CIPhe inhibited yolk granule degradation in the notochord and DEDTC caused notochordal hypertrophy. The results show that interference with synthesis or action of catecholamines and serotonin affects morphogenesis. With the methods used it is not possible to discover exactly how monoamines regulate the morphogenetic events because of the unspecific side effects of the antagonists and the feedback interactions between the monoamines.
Insights
Monoamine antagonists disrupt newt embryo development, affecting gastrulation and causing malformations. These findings highlight the crucial role of monoamines in embryonic morphogenesis.
Area of Science:
- Developmental biology
- Neuroscience
- Pharmacology
Background:
- Monoamines are critical neurotransmitters involved in various physiological processes.
- Understanding their role in embryonic development is essential for developmental biology and neuroscience.
- Previous research suggests monoamines influence cellular differentiation and tissue formation.
Purpose of the Study:
- To investigate the impact of specific monoamine antagonists on newt embryo morphogenesis.
- To determine the effects of p-chlorophenylalanine, diethyldithiocarbamate, and propranolol on key developmental stages.
- To elucidate the role of catecholamines and serotonin in embryonic development.
Main Methods:
- Newt embryos were exposed to three monoamine antagonists: p-chlorophenylalanine (p-CPA), diethyldithiocarbamate (DEDTC), and propranolol.
- Antagonists were administered during the late blastula and neurula stages of embryonic development.
- Various concentrations (0.1-1 mM) of the antagonists were used to assess dose-dependent effects.
Main Results:
- High antagonist concentrations (1 mM) arrested gastrulation and led to embryo disintegration.
- Lower concentrations (0.1-0.5 mM) retarded morphogenetic movements and caused anterior malformations and delayed pigmentation.
- p-CPA inhibited notochordal yolk granule degradation, while DEDTC induced notochordal hypertrophy.
Conclusions:
- Interference with monoamine synthesis or action significantly impacts embryonic morphogenesis.
- Monoamines play a vital role in regulating gastrulation, tissue formation, and pigmentation during development.
- The study's findings underscore the complexity of monoamine signaling in development, with unspecific antagonist effects limiting precise mechanistic insights.