Cold incubation
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Effects of Cold Incubation on Various Biological Systems
Cold Incubation in Broiler Chickens: Energy Metabolism and Antioxidant Pathways
Cold incubation in broiler chickens has been shown to induce significant changes in energy metabolism and antioxidant pathways. When eggs were incubated at a temperature reduced by 1°C for 6 hours daily from days 10 to 18, there was an increase in hepatic catalase activity and a decrease in the expression of avian uncoupling protein 3 at hatch. However, long-term enhancement in the expression of this protein was observed, likely due to increased expression of the transcription factor peroxisome proliferator-activated receptor-γ coactivator-1α. These changes were associated with improved resistance to cold conditions post-hatch, suggesting that cyclically cold incubation can enhance the health of chickens reared under cold conditions .
Cold Incubation and Rewarming in Rat Renal Proximal Tubules
Cold incubation and subsequent rewarming can cause significant injury in isolated rat renal proximal tubules, with the injury being iron-dependent. The use of iron chelators during cold incubation reduced lactate dehydrogenase (LDH) release, indicating less cellular damage. Additionally, lipid peroxidation was decreased, and metabolic activity was better preserved in the presence of iron chelators. These findings highlight the importance of iron in cold incubation-induced injury and suggest that iron chelation can mitigate some of the adverse effects .
Cold Incubation Effects on Bactrocera zonata Development
In a study on Bactrocera zonata, larvae subjected to cold incubation at 8°C for periods ranging from 1 to 15 days showed varied effects on their life cycle. While most cold treatments did not significantly affect the life cycle, a 9-day cold incubation period resulted in a reduced population, and treatments from 13 to 15 days led to the highest survival rates. This indicates that cold incubation can influence the developmental stages and survival of Bactrocera zonata .
Sodium and Chloride Content in Liver Cells During Cold Incubation
Contrary to the common belief that hypothermia leads to intracellular accumulation of sodium and chloride, studies on cultured liver endothelial cells and hepatocytes revealed a rapid decrease in these ions during cold incubation. This decrease was observed regardless of the preservation solution used, suggesting that sodium efflux predominates over influx during the early phase of cold incubation. This finding challenges the traditional understanding of ion dynamics under hypothermic conditions .
Reactive Oxygen Species and Cold Incubation in Hepatocytes
Cold incubation in preservation solutions like University of Wisconsin (UW) and histidine-tryptophan-ketoglutarate (HTK) leads to significant injury in cultured hepatocytes, mediated by reactive oxygen species (ROS). The injury was reduced by antioxidants and iron chelators, indicating that hydroxyl radicals formed by Fenton chemistry play a crucial role. Despite the low formation of hydrogen peroxide and superoxide anion radicals, the increase in chelatable iron during cold incubation suggests that alterations in iron homeostasis are a primary cause of oxidative injury 59.
Cold Incubation and Cold Tolerance in Precocial Birds
In Japanese quail, low incubation temperatures (35.5°C) resulted in delayed development, smaller size at hatch, and reduced cold tolerance compared to higher incubation temperatures (37.0°C and 38.5°C). These chicks exhibited increased cooling rates and reduced homeothermy, likely due to decreased heat production and insulation. This reduced cold tolerance could have significant ecological implications, affecting the balance between foraging and brooding in the wild 67.
Metabolic and Endocrine Responses in Goat Fetuses
Experiments on goat fetuses using an extrauterine incubation system showed that metabolic and endocrine responses to cold exposure develop with gestational age. Older fetuses (122-134 days of gestation) exhibited significant increases in oxygen consumption and plasma concentrations of stress hormones during cold exposure, while younger fetuses (95-116 days) did not. This suggests that the ability to respond to cold stress matures around 100 days of gestation .
Conclusion
Cold incubation has diverse effects across different biological systems, from enhancing antioxidant pathways in broiler chickens to influencing developmental stages in insects and altering ion dynamics in liver cells. Understanding these effects can help optimize conditions for various applications, including improving animal health and managing organ preservation.
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