The special behavior of equine erythrocytes connected with the methemoglobin regulation.

This research looks at how red blood cells in thoroughbred horses react to oxidation by sodium nitrite, comparing the outcome to that in human red blood cells. The focus is on how effectively these horse cells can convert methemoglobin back to hemoglobin in various environments.

Research Approach

• The study began by inducing oxidation of hemoglobin in horse red blood cells using sodium nitrite. This process was done to differing extents, either mostly (80-90%) or partially (25-40%).
• The research team then examined how the oxidized cells could convert methemoglobin back into hemoglobin. This was done in the presence of various substances including glucose, a combination of glucose and methylene blue, and lactate.
• The findings from the horse cells were then compared with similar experiments conducted previously on human red blood cells.

Findings

• Under complete oxidation, horse red blood cells needed more time to reduce methemoglobin back into hemoglobin than human cells, when in the presence of glucose or glucose and methylene blue.
• Interestingly, while methylene blue enhanced the reduction process in human cells, it didn’t have the same effect in horse cells.
• In horse cells, lactate proved to be a more efficient in promoting methemoglobin reduction.
• Under partial oxidation, horse red blood cells were quick in reducing methemoglobin in any of the incubation media.

Implications of Research

• The results of the study can clarify contradictions found in earlier studies, which stated that horse red blood cells could not reduce methemoglobin, despite the lack of observable methemoglobinemia (a condition of having methemoglobin in the blood) in clinical practice with horses.

The findings provide useful insights into the distinct characteristics of horse red blood cells, which may help develop improved treatments for diseases associated with oxidation and reduction processes in cells.