Nickel deficiency in rats

Area of Science:

• Nutritional Biochemistry
• Toxicology
• Animal Physiology

Background:

• Nickel is an essential trace element for some species.
• Understanding nickel's role in mammalian physiology is crucial for nutrition and health.
• Previous research suggests potential roles for nickel in metabolic processes.

Purpose of the Study:

• To investigate the pathological effects of nickel deficiency in rats.
• To characterize the physiological and ultrastructural changes associated with low nickel intake.
• To establish a model for studying nickel's biological functions.

Main Methods:

• Rats were fed a nickel-deficient diet (2-15 ng/g) or a control diet with supplemental nickel.
• Pathological findings, growth parameters, hematocrits, and liver biochemistry were assessed.
• Liver homogenates were analyzed for enzyme activity (alpha-glycerophosphate oxidation).
• Ultrastructural examination of liver tissue was performed.

Main Results:

• Nickel deficiency caused increased perinatal mortality and unthriftiness (rough coat, uneven hair).
• Altered liver appearance, decreased liver cholesterol, and increased alpha-glycerophosphate oxidation were observed.
• Ultrastructural analysis revealed significant changes in the rough endoplasmic reticulum of liver cells.
• Growth, hematocrits, and liver lipids (total and phospholipids) tended to decrease.

Conclusions:

• Nickel deficiency induces significant pathological changes in rats, affecting mortality, development, and liver function.
• The observed alterations in liver biochemistry and ultrastructure suggest a critical role for nickel in cellular processes.
• This study provides evidence for nickel's essentiality in mammalian nutrition and identifies key indicators of deficiency.