Results
Epigenetic changes are crucial in the aging process. Which epigenetic modification is most associated with aging and how does it affect skin cells?Answer A) DNA methylation; it leads to the suppression of gene expression involved in cell repair and regeneration.
DNA methylation is a common epigenetic modification that can suppress gene expression. In aging, increased methylation of specific genes can decrease their expression, impairing processes like cell repair and regeneration crucial for maintaining healthy skin.
Mizushima, N. (2007). Autophagy: process and function. Genes & Development, 21(22), 2861-2873. Mizushima, 2007
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Autophagy plays a significant role in maintaining cellular health and longevity. What is the primary mechanism by which autophagy influences skin aging?B) It degrades damaged cellular components, reducing oxidative stress and promoting cell survival
Autophagy is a cellular process that removes damaged organelles and proteins, reducing oxidative stress and preventing the accumulation of cellular damage, which is crucial for healthy skin and delaying aging.
Mizushima, N. (2007). Autophagy: process and function. Genes & Development, 21(22),
2861-2873. Mizushima, 2007
Results
Matrix metalloproteinases (MMPs) are enzymes that degrade extracellular matrix components. How do MMPs contribute to the aging of the skin?B) They degrade collagen and elastin fibers, resulting in skin thinning and wrinkle formation.
MMPs break down collagen and elastin, which are essential for maintaining skin structure and elasticity. Their increased activity in aging contributes to the degradation of these proteins, leading to visible signs of skin aging such as wrinkles and sagging.
Fisher, G. J., et al. (1997). Mechanisms of photoaging and chronological skin aging.
Archives of Dermatology, 133(12), 1701-1707. Fisher et al., 1997.
Results
The skin microbiome plays a crucial role in skin health. How does an imbalance in the skin microbiome contribute to premature skin aging?B) It promotes chronic inflammation and disrupts the skin barrier, leading to accelerated aging
An imbalance in the skin microbiome can lead to increased inflammation and disruption of the skin barrier, both of which are associated with accelerated skin aging and conditions like dryness, wrinkles, and sensitivity.
Biedermann, L., & Rogler, G. (2015). The intestinal microbiota: its role in health and
disease. European Journal of Pediatrics, 174(1), 101-112. Biedermann & Rogler, 2015.
Results
Hormonal changes, particularly during menopause, significantly affect skin aging. Which hormone's decline is most associated with increased skin aging, and what are the effects?B) Estrogen; results in reduced collagen production, loss of skin elasticity, and increased dryness.
Estrogen plays a vital role in skin health by maintaining collagen levels, skin thickness, and moisture. Its decline during menopause leads to reduced collagen production, loss of elasticity, and increased skin dryness.
Brincat, M., et al. (1987). Skin collagen changes in post-menopausal women receiving
different doses of estrogen therapy. Obstetrics and Gynecology, 70(1), 123-127 Brincat
et al., 1987
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Patients with diabetes often exhibit accelerated skin aging due to AGEs. How do AGEs exacerbate skin complications in diabetic patients?B) AGEs bind to RAGE receptors, leading to increased inflammation and impaired wound healing.
Advanced Glycation End Products (AGEs) bind to Receptor for Advanced Glycation End-products (RAGE), which triggers inflammation and oxidative stress. This exacerbates skin issues like impaired wound healing and accelerates aging, especially in diabetic patients.
Singh, R., et al. (2001). Advanced glycation end-products: a review. Diabetologia, 44(2),
129-146. Singh et al., 2001.
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Photodynamic therapy is used to treat various skin conditions. What is the mechanism by which PDT helps in reducing signs of aging?B) PDT generates reactive oxygen species that target and destroy damaged cells, promoting new collagen synthesis
Photodynamic therapy (PDT) uses light-activated compounds to produce reactive oxygen species (ROS). These ROS create damage signals, which can lead to the stimulation of new collagen synthesis and improvement in skin texture and firmness.
Morton, C. A., et al. (2015). Practical treatment guidelines for topical photodynamic
therapy in dermatology: treatment of inflammatory/infective dermatoses,
photorejuvenation and field cancerization. Journal of the European Academy of
Dermatology and Venereology, 29(9), 1713-1725. Morton et al.,2015.
Results
Reactive oxygen species (ROS) are a major contributor to skin aging. Which of the following best describes how ROS affects the skin?B) ROS induces DNA damage and lipid peroxidation, leading to cellular senescence and wrinkle formation.
Reactive oxygen species (ROS) cause oxidative damage to DNA, proteins, and lipids in skin cells. This damage leads to cellular senescence, where cells lose their ability to function properly, contributing to signs of aging like wrinkles and loss of skin elasticity.
Poljšak, B., & Dahmane, R. (2012). Free radicals and extrinsic skin aging. Dermatology
Research and Practice, 2012, 135206 Poljšak & Dahmane, 2012.