Relationships between vitamin E status and erythrocyte stability in sheep

Area of Science:

• Veterinary Medicine
• Biochemistry
• Animal Nutrition

Background:

• Vitamin E deficiency can affect erythrocyte stability.
• Clinical signs may not be apparent in deficient animals.
• Creatine kinase (CK) activity is often elevated in vitamin E deficiency.

Purpose of the Study:

• To compare erythrocyte stability in vitamin E-deficient (E-deficient) and control sheep using osmotic fragility and detergent sensitivity tests.
• To evaluate the relationship between haemolysis, plasma alpha-tocopherol, and CK activity.
• To assess the efficacy of alpha-tocopherol supplementation in correcting erythrocyte instability.

Main Methods:

• Haemolytic tests (osmotic fragility and detergent sensitivity) were performed on erythrocytes from E-deficient and control sheep.
• Plasma alpha-tocopherol concentration and CK activity were measured.
• E-deficient sheep were supplemented with alpha-tocopherol, and parameters were re-evaluated.

Main Results:

• Erythrocytes from E-deficient sheep showed significantly higher susceptibility to detergent (Tween 20) lysis compared to controls.
• Osmotic fragility was similar between groups.
• Detergent sensitivity correlated positively with CK activity and inversely with plasma alpha-tocopherol.
• Supplementation rapidly normalized plasma alpha-tocopherol and reduced detergent sensitivity.

Conclusions:

• Detergent sensitivity of erythrocytes is a sensitive indicator of vitamin E deficiency in sheep.
• This haemolytic test provides a simple, functional diagnostic tool for vitamin E deficiency.
• Erythrocyte membrane integrity is compromised in vitamin E deficiency, as evidenced by increased detergent sensitivity.