Extracutaneous histologic changes accompanying zinc deficiency in pups

Area of Science:

• Immunology
• Nutritional Science
• Pathology

Background:

• Zinc is an essential micronutrient crucial for immune system function.
• Zinc deficiency can lead to various health issues, including impaired immune responses.
• Extracutaneous manifestations of zinc deficiency are not fully understood.

Purpose of the Study:

• To investigate the extracutaneous effects of zinc deficiency in young mammals.
• To identify specific tissues affected by a zinc-deficient diet.
• To characterize the histological changes associated with zinc deficiency in immune organs and oral mucosa.

Main Methods:

• A controlled study using young pups (n=7).
• Experimental group fed a zinc-deficient diet for 5 weeks (n=4).
• Control group fed a zinc-adequate diet for 5 weeks (n=3).
• Histopathological examination of buccal mucosa, lymph nodes, spleen, and thymus.

Main Results:

• Pups fed a zinc-deficient diet exhibited lesions in the buccal mucosa, lymph nodes, spleen, and thymus.
• Buccal mucosa lesions included irregular epithelial hyperplasia and disrupted cell layers.
• Significant lymphocyte depletion was observed in the thymus and T-cell areas of lymph nodes and spleen.

Conclusions:

• Dietary zinc deficiency induces significant pathological changes in extracutaneous tissues, particularly affecting the oral mucosa and lymphoid organs.
• Zinc deficiency severely impacts immune cell populations, leading to lymphocyte absence in the thymus and T-cell areas.
• These findings highlight the critical role of adequate zinc intake for maintaining oral health and immune system integrity.