Cutaneous
aging is a multifactorial process affecting different constituents of the skin
(Reddy and Gilchrest 2011). During aging, distribution of subcutaneous fat is
altered. The subcutaneous fat is significantly lost from the dorsum of the
hand, face and shin, but accumulates in the waist or thigh (Kligman et al.1985;
Farage et al.2007). In the epidermis, signs of aging include lowering of the
levels of collagen IV and collagen VII at the basement membrane, flattening of
the rete ridge, thinning of the epidermis, and lowering of the levels of
ceramides, free fatty acids, squalene and epidermal cholesterol (El-Domyati et
al.2002; Hayashi et al.2003; Sandby-Moller et al.2003; Neerken et al.2004; Fore
2006). In the dermis, aging leads to fragmentation of elastin, an increase in
collagen degradation, and a decrease in production of dermal collagen,
proteoglycans and glycosaminoglycans.
Website: http://www.arjonline.org/biosciences/american-research-journal-of-biosciences/
Website: http://www.arjonline.org/biosciences/american-research-journal-of-biosciences/
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