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[Effect of TRH and its analog DN-1417 on anoxia-induced amnesia in mice]
Abstract:
The effect of neuropeptides and their analogs on anoxia-induced amnesia was examined using one-trial passive avoidance task in mice. Anoxia, produced by the exposure to CO2 immediately after the acquisition of avoidance response, induced amnesia which is shown by a short latency to enter from the safety compartment into the shocked compartment in the retention test conducted 24 hr later. In these anoxia-treated animals, thyrotropin-releasing hormone (TRH: 10-20 mg/kg), its analog DN-1417 (10-20 mg/kg) and ACTH 4-10 (66 micrograms/body), which were given sc 15-60 min before the retention test, markedly prolonged the latency in a dose-dependent manner, indicating a reversal of the amnesia. Arginine- and lysine-vasopressin also reversed the amnesia at a dose of 100 micrograms/body. These results suggest that TRH and DN-1417, known to reverse the amnesia produced by the protein synthesis inhibitor cycloheximide, have ameliorating effects on the retrieval process of memory.
Insights
Neuropeptides like thyrotropin-releasing hormone (TRH) and vasopressin analogs can reverse amnesia caused by anoxia in mice. These findings suggest potential therapeutic effects on memory retrieval processes.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Anoxia, a state of oxygen deprivation, can induce amnesia.
- Neuropeptides are signaling molecules in the nervous system with diverse functions.
Purpose of the Study:
- To investigate the effects of neuropeptides and their analogs on anoxia-induced amnesia in a mouse model.
- To determine if specific neuropeptides can reverse memory deficits caused by anoxia.
Main Methods:
- A one-trial passive avoidance task was used in mice.
- Anoxia was induced by CO2 exposure post-acquisition.
- Neuropeptides (TRH, DN-1417, ACTH 4-10, vasopressin) were administered before memory retention testing.
Main Results:
- Anoxia induced amnesia, evidenced by reduced latency to enter a previously shocked compartment.
- Thyrotropin-releasing hormone (TRH), its analog DN-1417, ACTH 4-10, and vasopressin significantly reversed this amnesia in a dose-dependent manner.
- The reversal of amnesia suggests a positive impact on memory retrieval.
Conclusions:
- TRH, DN-1417, ACTH 4-10, and vasopressin demonstrate potential in ameliorating anoxia-induced memory impairment.
- These neuropeptides may enhance the memory retrieval process, offering insights into treating memory disorders.