Lipofuscin in human tongue muscle

Area of Science:

• Histology
• Gerontology
• Biochemistry

Background:

• Lipofuscin, an endogenous pigment, is associated with cellular aging.
• Previous studies have documented lipofuscin accumulation in various tissues with age.

Purpose of the Study:

• To investigate the presence and characteristics of lipofuscin in human tongue muscle fibers.
• To determine the correlation between lipofuscin accumulation and age in the tongue.

Main Methods:

• Histochemical staining (PAS, Masson-Fontana, Sudan black, Ziehl-Neelson) of 107 tongue specimens.
• Microscopic examination for lipofuscin granules.
• Autofluorescence analysis under ultraviolet light.
• Statistical analysis to assess age-related correlations.

Main Results:

• Lipofuscin granules were identified in 93% of tongue specimens from individuals over 18 years old.
• The pigment was absent in individuals under 18.
• Histochemical and autofluorescence properties confirmed the pigment as lipofuscin.
• A statistically significant direct correlation (P = 0.001) was observed between age and the quantity/distribution of lipofuscin in both sexes.
• Lipofuscin accumulation in the tongue mirrored that observed in the myocardium.

Conclusions:

• Lipofuscin is a common age-related pigment found in human tongue muscle fibers.
• The accumulation of lipofuscin in the tongue increases with age, similar to other tissues like the myocardium.
• This finding contributes to understanding age-related changes in muscle tissue composition.