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Radiosynthesis of 1-(2-[18F]Fluoroethyl)-L-Tryptophan using a One-pot, Two-step Protocol
Published on: September 21, 2021
Tryptophan hydroxylase: a target for neuroendocrine disruption
Saydur Rahman1, Izhar A Khan, Peter Thomas
1Marine Science Institute, University of Texas at Austin, Port Aransas, Texas 78373, USA.
Environmental stressors like hypoxia and Aroclor 1254 disrupt fish reproduction by inhibiting tryptophan hydroxylase (TPH), the key enzyme for serotonin (5-HT) synthesis. Restoring 5-HT levels or using antioxidants can reverse these effects.
Area of Science:
- Environmental toxicology
- Neuroendocrinology
- Fish reproductive biology
Background:
- Tryptophan hydroxylase (TPH) is crucial for serotonin (5-HT) synthesis in the central nervous system, regulating neuroendocrine functions like reproduction.
- Hypothalamic TPH is a key target for environmental stressors affecting the hypothalamic-pituitary-gonadal axis.
Purpose of the Study:
- To review the effects of hypoxia and Aroclor 1254 on the brain serotonergic system controlling reproductive neuroendocrine function in Atlantic croaker.
- To investigate the role of the serotonergic system in mediating the reproductive toxicity of these environmental stressors.
Main Methods:
- Exposure of Atlantic croaker to hypoxia and Aroclor 1254.
- Measurement of TPH activity, hypothalamic 5-HT and GnRH I content, and LH secretion.
- Pharmacological restoration of 5-HT levels and antioxidant treatment (vitamin E).
Main Results:
- Both hypoxia and Aroclor 1254 decreased TPH activity, hypothalamic 5-HT and GnRH I, and reduced LH secretion and gonadal development.
- Pharmacological restoration of 5-HT reversed the neuroendocrine and reproductive inhibition.
- Vitamin E treatment reversed Aroclor 1254's inhibitory effects on TPH activity.
Conclusions:
- The serotonergic system, specifically TPH, is a major target for neuroendocrine disruption by environmental stressors like hypoxia and Aroclor 1254.
- Hypothalamic antioxidant status may be involved in the mechanism of TPH downregulation by these stressors.
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