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The Effect of Aging on Tissues

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...

Aging

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...

Renewal of Skin Epidermal Stem Cells

Renewal of Skin Epidermal Stem Cells

The skin is divided into epidermis, dermis, and hypodermis, the skin's outermost, middle, and inner layers. The human epidermal layer regularly undergoes renewal, where old, dead cells are replaced by new cells. Epidermal stem cells or EpiSCs divide and differentiate to restore the lost cells. For the renewal process, some EpiSCs continuously self-renew. In contrast, few others differentiate into transit-amplifying cells, which later form prickle or spinous cells, followed by granular cells,...

Pigmentation

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...

Bone Disorders

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...

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[Skin aging].

E Kohl¹, M Landthaler, R-M Szeimies

¹Klinik und Poliklinik für Dermatologie, Universitätsklinikum Regensburg, 93053 Regensburg. Elisabeth.Kohl@klinik.uni-regensburg.de

Der Hautarzt; Zeitschrift Fur Dermatologie, Venerologie, Und Verwandte Gebiete

|November 10, 2009

Summary

This summary is machine-generated.

Skin aging is influenced by internal processes and external factors like UV radiation, leading to molecular changes and extracellular matrix degradation. Understanding these mechanisms drives therapeutic and preventive strategies for photoaging.

Related Experiment Videos

Area of Science:

Dermatology and Molecular Biology
Study of intrinsic and extrinsic skin aging mechanisms.

Context:

Skin aging is a natural process influenced by both internal (intrinsic) and external (extrinsic) factors.
Ultraviolet (UV) radiation is a primary driver of premature extrinsic skin aging (photoaging), particularly in sun-exposed areas.

Purpose:

To elucidate the molecular similarities and differences between intrinsic and extrinsic skin aging.
To identify key molecular events contributing to skin aging, such as reactive oxygen species formation and metalloproteinase induction.

Summary:

Both intrinsic and extrinsic aging involve molecular pathways, including the generation of reactive oxygen species and metalloproteinase induction.
Fragmented collagen accumulation impedes new collagen formation and promotes extracellular matrix degradation via a positive feedback loop.

Impact:

Highlights the significant role of extrinsic factors, especially UV radiation, in skin aging.
Research into aging mechanisms informs the development of novel therapeutic and preventive strategies for skin aging and photoaging.