Effects of exercise and adrenaline on equine erythrocyte ATP content.

This study investigated the assertion that red blood cells (erythrocytes) released by horse spleens are older than cells in general circulation by examining their cellular components before and after spleen release. It found no evidence that the released cells were older, but noted a drop in ATP content which might overall impact the cells’ characteristics.

Objective and Methodology

• The main objective of this research was to test the theory that erythrocytes (red blood cells) released from the spleen in horses, specifically thoroughbreds and ponies, are older compared to those already present in normal circulation.
• To examine this, the scientists measured the concentration of certain key chemicals such as 2,3, diphosphoglycerate (2,3 DPG), adenosine triphosphate (ATP), and creatine in the erythrocytes both before and after releasing them from the spleen.
• The release of these cells was triggered either through exercise or by intra-venous injection of adrenaline.

Baseline Observations

• Initial benchmarks for these concentrations were established by observing 43 thoroughbreds and 10 ponies at rest.

Key Findings of the Study

• Following the exercise or adrenaline injection in six thoroughbreds, an increase in erythrocyte creatine content and a decrease in ATP concentration was observed.
• Exercise resulted in a slight augmentation in 2,3 DPG levels, whereas adrenaline administration didn’t affect this concentration.
• These responses were also tested in two spleen-removed (splenectomised) ponies, where adrenaline injection resulted only in decreased erythrocyte ATP, with no changes in creatine or 2,3 DPG contents.

Conclusion

• The study concluded that the erythrocytes released from the spleen aren’t generally older cells.
• The stimuli used did however result in a decrease of ATP content, a crucial molecule for cellular energy, which may alter the overall properties and functionalities of the red blood cells.