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AGE-RELATED CHANGES IN HUMAN SKIN: HISTOLOGICAL, MORPHOMETRIC AND IMMUNCYTOCHEMICAL STUDY USING S100

Authors: Salih S Kadhim صالح سلمان كاظم --- May F Al-Habib مي فاضل الحبيب
Journal: IRAQI JOURNAL OF MEDICAL SCIENCES المجلة العراقية للعلوم الطبية ISSN: P16816579,E22244719 Year: 2012 Volume: 10 Issue: 2 Pages: 111-118
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Background: Aging has many effects on a person’s skin, from wrinkles and sags to increased risk of certain skin conditions, such as skin cancer. As people age, their skin begins to change due to environmental, genetic, nutrition and other factors.Objectives: Understand some of the changes that occur in aging skin including changes in the general morphological, histological and architectural arrangement, epidermal thickness, basement membrane and histochemical changes in melanocytes.Methods: Skin specimens were taken from the anterior abdominal wall of 30 human males at different ages. General histological preparation for paraffin blocks was performed and the blocks were sectioned at (5-6µ) and stained with H&E. S100 protein was used to demonstrate immunohistochemistry labeled melanocytes changes with age. Histometric measurement of epidermal thickness and basement membrane thickness, using eyepiece graticule was performed on these groups.Results: The young age group showed a uniform arrangement of cells in all stratums of the epidermis while the old age group showed diminished thickness of the epidermis. A significant difference between young- adult age group (A and B groups) and the old age group (C group) was recorded. The epithelial basement membrane thickness was increased with age significantly (P value ≤ 0.001). Melanocytes demonstration using S100 showed that these cells tend to be situated at the tips of rete pages, there number are generally low and didn't varied a lot between young and adult age groups. There was yet marked decline in the number of melanocytes in old age group.Conclusion: Aging as a process have a marked influences on skin morphology, thickness, cellularity and basement membrane.Key Words: Aging, skin, S100, morphometry and basement membrane


Article
SEMI-AUTOMATED COMPUTATIONAL METHOD FOR SKELETAL MUSCLE FIBER TYPING WITH LECTINS: CORRELATION WITH MORPHOMETRIC STUDIES

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Abstract

Background :Muscle fiber typing has been an extensive field of study for many years. Though, limited researches applied lectin histochemistry in the clinical diagnosis of muscle disorders; attention was directed mainly towards enzyme histochemistry.Objective:The use of lectins as recognition systems based on specific protein-carbohydrate interactions in correlation with muscle fibers morphometric standards and optical density features to favor the diagnostic procedures of muscle disorders.Methods:Cross-sections of tibialis anterior muscle from 15 adult rats were stained with Con A, PNA, SBA, WGA, SWGA, LFA, UEA-I, and UEA-II lectins. Photographs of stained sections were analyzed with ImageJ 1.44 software for muscle fiber area, perimeter, optical density, and integrated density.Results:There were statistically significant differences between the parameters of muscle fiber types under study (P<0.05) concerning Con A, LFA and UEA-II lectins, but not for the remaining lectins, regarding the optical density and integrated density of muscle fibers.Conclusions:Lectins make accurate recognition of muscle fiber types on fixed paraffin sections when combined with computerized methods to quantify the features seen in muscle biopsies destined for pathological investigations.Key words:Lectins, Muscle fiber typing, Quantitative, Optical density, Morphometry

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