Aging-associated diseases

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Age-specific SEER incidence rates, 2003-2007 Age Specific SEER Incidence Rates 2003-2007.svg
Age-specific SEER incidence rates, 2003–2007

An aging-associated disease (commonly termed age-related disease, ARD) is a disease that is most often seen with increasing frequency with increasing senescence. They are essentially complications of senescence, distinguished from the aging process itself because all adult animals age (with rare exceptions) but not all adult animals experience all age-associated diseases. The term does not refer to age-specific diseases, such as the childhood diseases chicken pox and measles, only diseases of the elderly. They are also not accelerated aging diseases, all of which are genetic disorders.

Contents

Examples of aging-associated diseases are atherosclerosis and cardiovascular disease, cancer, arthritis, cataracts, osteoporosis, type 2 diabetes, hypertension and Alzheimer's disease. The incidence of all of these diseases increases exponentially with age. [1]

Of the roughly 150,000 people who die each day across the globe, about two thirds—100,000 per day—die of age-related causes. [2] In industrialized nations, the proportion is higher, reaching 90%. [2]

Patterns of differences

By age 3, about 30% of rats have had cancer, whereas by age 85 about 30% of humans have had cancer. Humans, dogs and rabbits get Alzheimer's disease, but rodents do not. Elderly rodents typically die of cancer or kidney disease, but not of cardiovascular disease. In humans, the relative incidence of cancer increases exponentially with age for most cancers, but levels off or may even decline by age 60–75 [3] (although colon/rectal cancer continues to increase). [4]

People with the so-called segmental progerias are vulnerable to different sets of diseases. Those with Werner's syndrome experience osteoporosis, cataracts, and, cardiovascular disease, but not neurodegeneration or Alzheimer's disease; those with Down syndrome have type 2 diabetes and Alzheimer's disease, but not high blood pressure, osteoporosis or cataracts. In Bloom syndrome, those affected most often die of cancer.

Research

Aging (senescence) increases vulnerability to age-associated diseases, whereas genetics determines vulnerability or resistance between species and individuals within species. Some age-related changes (like graying hair) are said to be unrelated to an increase in mortality. But some biogerontologists believe that the same underlying changes that cause graying hair also increase mortality in other organ systems and that understanding the incidence of age-associated disease will advance knowledge of the biology of senescence just as knowledge of childhood diseases advanced knowledge of human development. [5]

Strategies for engineered negligible senescence (SENS) is an emerging research strategy that aims to repair "root causes" for age-related illness and degeneration, as well as develop medical procedures to periodically repair all such damage in the human body, thereby maintaining a youth-like state indefinitely. [6] The SENS programme has identified seven types of aging-related damage, and feasible solutions have been outlined for each. Some critics argue that the SENS agenda is optimistic at best, and that the aging process is too complex and little-understood for SENS to be scientific or implementable in the foreseeable future. [7] [8] [9] It has been proposed that age-related diseases are mediated by vicious cycles. [10]

On the basis of extensive research, DNA damage has emerged a major culprit in cancer and numerous other diseases related to ageing. [11] DNA damage can initiate the development of cancer or other aging related diseases depending on several factors. These include the type, amount, and location of the DNA damage in the body, the type of cell experiencing the damage and its stage in the cell cycle, and the specific DNA repair processes available to react to the damage. [11]

Types

Macular degeneration

Age-related macular degeneration (AMD) is a disease that affects the eyes and can lead to vision loss through break down of the central part of the retina called the macula. Degeneration can occur in one eye or both and can be classified as either wet (neovascular) or dry (atrophic). Wet AMD commonly is caused by blood vessels near the retina that lead to swelling of the macula. [12] The cause of dry AMD is less clear, but it is thought to be partly caused by breakdown of light-sensitive cells and tissue surrounding the macula. A major risk factor for AMD is age over the age of 60. [13]

Alzheimer's

Alzheimer's disease is classified as a "protein misfolding" disease. Aging causes mutations in protein folding, and as a result causes deposits of abnormal modified proteins to accumulate in specific areas of the brain. In Alzheimer's, deposits of Beta-amyloid and hyperphosphorylated tau protein form extracellular plaques and extracellular tangles. [14] These deposits are shown to be neurotoxic and cause cognitive impairment due to their initiation of destructive biochemical pathways. [15]

Atherosclerosis

Atherosclerosis is categorized as an aging disease and is brought about by vascular remodeling, the accumulation of plaque, and the loss of arterial elasticity. Over time, these processes can stiffen the vasculature. For these reasons, older age is listed as a major risk factor for atherosclerosis. [16] Specifically, the risk of atherosclerosis increases for men above 45 years of age and women above 55 years of age. [17]

Benign prostatic hyperplasia

Benign prostatic hyperplasia (BPH) is a noncancerous enlargement of the prostate gland due to increased growth. [18] An enlarged prostate can result in incomplete or complete blockage of the bladder and interferes with a man's ability to urinate properly. Symptoms include overactive bladder, decreased stream of urine, hesitancy urinating, and incomplete emptying of the bladder. [19] [20] By age 40, 10% of men will have signs of BPH and by age 60, this percentage increases by 5 fold. Men over the age of 80 have over a 90% chance of developing BPH and almost 80% of men will develop BPH in their lifetime. [18] [21]

Cancer

Although it is possible for cancer to strike at any age, most patients with invasive cancer are over 65, [22] and the most significant risk factor for developing cancer is age. [22] According to cancer researcher Robert A. Weinberg, "If we lived long enough, sooner or later we all would get cancer." [23] Some of the association between aging and cancer is attributed to immunosenescence, [24] errors accumulated in DNA over a lifetime [25] and age-related changes in the endocrine system. [26] Aging's effect on cancer is complicated by factors such as DNA damage and inflammation promoting it and factors such as vascular aging and endocrine changes inhibiting it. [27]

Parkinson's

Parkinson's disease, or simply Parkinson's, [28] is a long-term degenerative disorder of the central nervous system that mainly affects the motor system. The disease has many complications, including anxiety, dementia, and depression. [29] Parkinson's disease typically occurs in people over the age of 60, of whom about one percent are affected. [30] [31] The prevalence of Parkinson's disease dementia also increases with age, and to a lesser degree, duration of the disease. [32] Exercise in middle age may reduce the risk of PD later in life. [33]

Stroke

Stroke was the second most frequent cause of death worldwide in 2011, accounting for 6.2 million deaths (~11% of the total). [34] Stroke could occur at any age, including in childhood, the risk of stroke increases exponentially from 30 years of age, and the cause varies by age. [35] Advanced age is one of the most significant stroke risk factors. 95% of strokes occur in people age 45 and older, and two-thirds of strokes occur in those over the age of 65. [36] [37] A person's risk of dying if he or she does have a stroke also increases with age.

Endocrine diseases

Studies in animal models show that clearance of senescent cells improves multiple age related endocrine disorders. [38]

Osteoporosis

Bone density declines with age. By the age of 85 years, ~70% of women and 30% of men have a osteoporosis defined as a bone density less than or equal to 2.5 standard deviations lower than young adults. [39]

Metabolic syndrome

The metabolic syndrome is the co-occurrence of metabolic risk factors for type 2 diabetes and cardiovascular disease (abdominal obesity, hyperglycemia, dyslipidemia, and hypertension). The prevalence of the metabolic syndrome increases with age reaching close to 50% of people over 60 years old in the USA. [40] as

See also

Related Research Articles

<span class="mw-page-title-main">Prostate cancer</span> Male reproductive organ cancer

Prostate cancer is the uncontrolled growth of cells in the prostate, a gland in the male reproductive system below the bladder. Abnormal growth of prostate tissue is usually detected through screening tests, typically blood tests that check for prostate-specific antigen (PSA) levels. Those with high levels of PSA in their blood are at increased risk for developing prostate cancer. Diagnosis requires a biopsy of the prostate. If cancer is present, the pathologist assigns a Gleason score, and a higher score represents a more dangerous tumor. Medical imaging is performed to look for cancer that has spread outside the prostate. Based on the Gleason score, PSA levels, and imaging results, a cancer case is assigned a stage 1 to 4. A higher stage signifies a more advanced, more dangerous disease.

<span class="mw-page-title-main">Benign prostatic hyperplasia</span> Noncancerous increase in size of the prostate gland

Benign prostatic hyperplasia (BPH), also called prostate enlargement, is a noncancerous increase in size of the prostate gland. Symptoms may include frequent urination, trouble starting to urinate, weak stream, inability to urinate, or loss of bladder control. Complications can include urinary tract infections, bladder stones, and chronic kidney problems.

Senescence or biological aging is the gradual deterioration of functional characteristics in living organisms. Whole organism senescence involves an increase in death rates or a decrease in fecundity with increasing age, at least in the later part of an organism's life cycle. However, the resulting effects of senescence can be delayed. The 1934 discovery that calorie restriction can extend lifespans by 50% in rats, the existence of species having negligible senescence, and the existence of potentially immortal organisms such as members of the genus Hydra have motivated research into delaying senescence and thus age-related diseases. Rare human mutations can cause accelerated aging diseases.

<span class="mw-page-title-main">Urinary retention</span> Inability to completely empty the bladder

Urinary retention is an inability to completely empty the bladder. Onset can be sudden or gradual. When of sudden onset, symptoms include an inability to urinate and lower abdominal pain. When of gradual onset, symptoms may include loss of bladder control, mild lower abdominal pain, and a weak urine stream. Those with long-term problems are at risk of urinary tract infections.

<span class="mw-page-title-main">Transurethral resection of the prostate</span> Surgical procedure to perform a prostatectomy

Transurethral resection of the prostate is a urological operation. It is used to treat benign prostatic hyperplasia (BPH). As the name indicates, it is performed by visualising the prostate through the urethra and removing tissue by electrocautery or sharp dissection. It has been the standard treatment for BPH for many years, but recently alternative, minimally invasive techniques have become available. This procedure is done with spinal or general anaesthetic. A triple lumen catheter is inserted through the urethra to irrigate and drain the bladder after the surgical procedure is complete. The outcome is considered excellent for 80–90% of BPH patients. The procedure carries minimal risk for erectile dysfunction, moderate risk for bleeding, and a large risk for retrograde ejaculation.

Strategies for engineered negligible senescence (SENS) is a range of proposed regenerative medical therapies, either planned or currently in development, for the periodic repair of all age-related damage to human tissue. These therapies have the ultimate aim of maintaining a state of negligible senescence in patients and postponing age-associated disease. SENS was first defined by British biogerontologist Aubrey de Grey. Many mainstream scientists believe that it is a fringe theory. De Grey later highlighted similarities and differences of SENS to subsequent categorization systems of the biology of aging, such as the highly influential Hallmarks of Aging published in 2013.

<span class="mw-page-title-main">Oxidative stress</span> Free radical toxicity

Oxidative stress reflects an imbalance between the systemic manifestation of reactive oxygen species and a biological system's ability to readily detoxify the reactive intermediates or to repair the resulting damage. Disturbances in the normal redox state of cells can cause toxic effects through the production of peroxides and free radicals that damage all components of the cell, including proteins, lipids, and DNA. Oxidative stress from oxidative metabolism causes base damage, as well as strand breaks in DNA. Base damage is mostly indirect and caused by the reactive oxygen species generated, e.g., O−
2, OH and H2O2. Further, some reactive oxidative species act as cellular messengers in redox signaling. Thus, oxidative stress can cause disruptions in normal mechanisms of cellular signaling.

Memory disorders are the result of damage to neuroanatomical structures that hinders the storage, retention and recollection of memories. Memory disorders can be progressive, including Alzheimer's disease, or they can be immediate including disorders resulting from head injury.

<span class="mw-page-title-main">Neurodegenerative disease</span> Central nervous system disease

A neurodegenerative disease is caused by the progressive loss of neurons, in the process known as neurodegeneration. Neuronal damage may also ultimately result in their death. Neurodegenerative diseases include amyotrophic lateral sclerosis, multiple sclerosis, Parkinson's disease, Alzheimer's disease, Huntington's disease, multiple system atrophy, tauopathies, and prion diseases. Neurodegeneration can be found in the brain at many different levels of neuronal circuitry, ranging from molecular to systemic. Because there is no known way to reverse the progressive degeneration of neurons, these diseases are considered to be incurable; however research has shown that the two major contributing factors to neurodegeneration are oxidative stress and inflammation. Biomedical research has revealed many similarities between these diseases at the subcellular level, including atypical protein assemblies and induced cell death. These similarities suggest that therapeutic advances against one neurodegenerative disease might ameliorate other diseases as well.

Enquiry into the evolution of ageing, or aging, aims to explain why a detrimental process such as ageing would evolve, and why there is so much variability in the lifespans of organisms. The classical theories of evolution suggest that environmental factors, such as predation, accidents, disease, and/or starvation, ensure that most organisms living in natural settings will not live until old age, and so there will be very little pressure to conserve genetic changes that increase longevity. Natural selection will instead strongly favor genes which ensure early maturation and rapid reproduction, and the selection for genetic traits which promote molecular and cellular self-maintenance will decline with age for most organisms.

Following is a list of topics related to life extension:

<span class="mw-page-title-main">Cellular senescence</span> Phenomenon characterized by the cessation of cell division

Cellular senescence is a phenomenon characterized by the cessation of cell division. In their experiments during the early 1960s, Leonard Hayflick and Paul Moorhead found that normal human fetal fibroblasts in culture reach a maximum of approximately 50 cell population doublings before becoming senescent. This process is known as "replicative senescence", or the Hayflick limit. Hayflick's discovery of mortal cells paved the path for the discovery and understanding of cellular aging molecular pathways. Cellular senescence can be initiated by a wide variety of stress inducing factors. These stress factors include both environmental and internal damaging events, abnormal cellular growth, oxidative stress, autophagy factors, among many other things.

Ageing is the process of becoming older. The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. In a broader sense, ageing can refer to single cells within an organism which have ceased dividing, or to the population of a species.

Lower urinary tract symptoms (LUTS) refer to a group of clinical symptoms involving the bladder, urinary sphincter, urethra and, in men, the prostate. The term is more commonly applied to men – over 40% of older men are affected – but lower urinary tract symptoms also affect women. The condition is also termed prostatism in men, but LUTS is preferred.

<span class="mw-page-title-main">Central nervous system disease</span> Disease of the brain or spinal cord

Central nervous system diseases or central nervous system disorders are a group of neurological disorders that affect the structure or function of the brain or spinal cord, which collectively form the central nervous system (CNS). These disorders may be caused by such things as infection, injury, blood clots, age related degeneration, cancer, autoimmune disfunction, and birth defects. The symptoms vary widely, as do the treatments.

<span class="mw-page-title-main">Epidemiology of cancer</span> The study of factors in cancer causes and treatments

The epidemiology of cancer is the study of the factors affecting cancer, as a way to infer possible trends and causes. The study of cancer epidemiology uses epidemiological methods to find the cause of cancer and to identify and develop improved treatments.

An epigenetic clock is a biochemical test that can be used to measure age. The test is based on DNA methylation levels, measuring the accumulation of methyl groups to one's DNA molecules.

The neuroscience of aging is the study of the changes in the nervous system that occur with aging. Aging is associated with many changes in the central nervous system, such as mild atrophy of the cortex, which is considered non-pathological. Aging is also associated with many neurological and neurodegenerative diseases, such as amyotrophic lateral sclerosis, dementia, mild cognitive impairment, Parkinson's disease, and Creutzfeldt–Jakob disease.

<span class="mw-page-title-main">Inflammaging</span> Chronic low-grade inflammation that develops with advanced age

Inflammaging is a chronic, sterile, low-grade inflammation that develops with advanced age, in the absence of overt infection, and may contribute to clinical manifestations of other age-related pathologies. Inflammaging is thought to be caused by a loss of control over systemic inflammation resulting in chronic overstimulation of the innate immune system. Inflammaging is a significant risk factor in mortality and morbidity in aged individuals.

Senescence-associated secretory phenotype (SASP) is a phenotype associated with senescent cells wherein those cells secrete high levels of inflammatory cytokines, immune modulators, growth factors, and proteases. SASP may also consist of exosomes and ectosomes containing enzymes, microRNA, DNA fragments, chemokines, and other bioactive factors. Soluble urokinase plasminogen activator surface receptor is part of SASP, and has been used to identify senescent cells for senolytic therapy. Initially, SASP is immunosuppressive and profibrotic, but progresses to become proinflammatory and fibrolytic. SASP is the primary cause of the detrimental effects of senescent cells.

References

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