Is TNF a link between aging-related reproductive endocrine dyscrasia and Alzheimer's disease?

Ian A Clark1, Craig S Atwood

  • 1Research School of Biology, Australian National University, Canberra, ACT, Australia. ian.clark@anu.edu.au

Insights

Aging hormones impact brain function by influencing tumor necrosis factor (TNF) and related cytokines. This pathway links hormonal changes to neurodegeneration, offering new insights into brain diseases like Alzheimer's and stroke.

Area of Science:

  • Neuroendocrinology
  • Neuroinflammation
  • Molecular mechanisms of neurodegeneration

Background:

  • Aging is associated with significant changes in reproductive hormone levels.
  • These hormonal shifts are implicated in various age-related neurological conditions.
  • The precise mechanisms linking hormonal changes to brain dysfunction remain incompletely understood.

Purpose of the Study:

  • To explore a novel mechanism by which aging-related reproductive hormones affect brain function.
  • To investigate the role of dyotic endocrine signals in modulating neuroinflammatory pathways.
  • To establish the link between hormonal signaling, cytokine expression, and neurodegeneration.

Main Methods:

  • Review and synthesis of existing evidence on hormonal signaling and neuroinflammation.
  • Analysis of the role of tumor necrosis factor (TNF) and related cytokines as downstream mediators.
  • Conceptual framework development connecting dyotic signaling to neurodegenerative processes.

Main Results:

  • Dyotic endocrine signals modulate the expression of tumor necrosis factor (TNF) and associated cytokines.
  • These cytokines act as a crucial downstream pathway mediating neurodegeneration and dysfunction.
  • A convergence of hormonal signaling and TNF-mediated pathways is identified.

Conclusions:

  • Aging-related hormonal changes can influence brain health through modulation of TNF signaling.
  • This mechanism provides a potential explanation for the pathophysiology of Alzheimer's disease, stroke, and traumatic brain injury.
  • Targeting this pathway may offer novel therapeutic strategies for neurodegenerative and brain diseases.

Related Concept Videos

The Effect of Aging on Tissues01:19

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...
4.1K
Bone Disorders01:29

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...
7.8K
Alzheimer's Disease: Overview01:26

Alzheimer's Disease: Overview

Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
2.0K
Menopause01:28

Menopause

Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
5.1K
Aging01:26

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...
1.0K
Psychoneuroimmunology: Diabetes and Cancer01:19

Psychoneuroimmunology: Diabetes and Cancer

Chronic stress has been linked to both the onset and progression of serious health conditions, including Type 2 diabetes and cancer. Type 2 diabetes, a widespread chronic illness, is closely associated with obesity and insulin resistance, both of which often worsen under stress. Studies indicate that men experiencing high levels of chronic stress face a 45% higher risk of developing diabetes compared to those with minimal stress. Stress triggers physiological responses that elevate blood...
633