Related Experiment Videos
Electron-microscopic changes in xerosis senilis epidermis. Its abnormal membrane-coating granule formation
Dermatologica
|January 1, 1983
Summary
This study reveals that xerosis senilis involves abnormal vesicle formation in keratinocytes, impacting the stratum corneum barrier. This age-dependent keratinocyte differentiation disorder contributes to dry, scaly skin by reducing lipids and increasing water loss.
Area of Science:
- Dermatology
- Cell Biology
- Biochemistry
Background:
- Xerosis senilis, or age-related dry skin, is characterized by a compromised stratum corneum barrier.
- The precise cellular mechanisms underlying xerosis senilis remain incompletely understood.
Purpose of the Study:
- To investigate the ultrastructural changes in the epidermis of patients with xerosis senilis.
- To elucidate the role of keratinocyte differentiation and lipid production in the pathogenesis of xerosis senilis.
Main Methods:
- Electron microscopy was used to examine skin specimens from patients with xerosis senilis.
- Cellular morphology and granule formation in the stratum corneum and stratum granulosum were analyzed.
Main Results:
- Stratum corneum showed low electron density and lacked a keratin pattern.
- Keratohyalin granules were reduced in number but normal in density.
- Abnormal vesicle formation, lacking lamellar structure, replaced membrane-coating granules in the stratum granulosum.
- This correlated with reduced lipid production and increased transepidermal water loss.
Conclusions:
- Deficient membrane-coating granule formation is an age-dependent disorder of keratinocyte differentiation.
- Impaired lipid production and barrier function contribute to the asteatotic, scaly skin observed in xerosis senilis.