5-Thio-D-glucose: hypothermic responses in mice

Area of Science:

• Physiology
• Metabolic Biochemistry
• Thermoregulation

Background:

• 5-thio-D-glucose (5-TG) is a glucose analog that can interfere with glucose metabolism.
• Understanding the physiological effects of 5-TG is crucial for metabolic research.
• Investigating the impact of environmental factors on drug-induced physiological changes.

Purpose of the Study:

• To investigate the hypothermic effects of 5-thio-D-glucose (5-TG) in adult male mice.
• To determine the influence of environmental temperature and food deprivation on 5-TG-induced hypothermia.
• To explore the relationship between 5-TG administration, body temperature, and circulating glucose levels.

Main Methods:

• Administration of varying doses of 5-TG via intracerebroventricular (icv) and intraperitoneal (ip) routes in mice.
• Exposure of mice to two different environmental temperatures (4°C and 22°C).
• Assessment of rectal temperature (Tre) and circulating glucose levels at different time points post-administration, considering fed and fasted states.

Main Results:

• Both icv and ip administration of 5-TG induced significant, dose-dependent reductions in rectal temperature (Tre).
• Hypothermic effects were significantly exacerbated by cold exposure (4°C) and food deprivation (18-hour fast).
• Reductions in Tre were accompanied by significant increases in circulating glucose levels.

Conclusions:

• 5-TG elicits hypothermia through mechanisms potentially involving central and peripheral cellular glucopenia.
• The observed hyperglycemia suggests a complex metabolic response to 5-TG.
• Competitive inhibition of glycolysis and reduced tissue glucose availability are proposed mechanisms for 5-TG-induced hypothermia.