Wikipedia

Frontotemporal dementia

(Redirected from Neuronal intermediate filament inclusion disease)

Frontotemporal dementia (FTD), also called frontotemporal degeneration disease[1] or frontotemporal neurocognitive disorder,[2] encompasses several types of dementia involving the progressive degeneration of the brain's frontal and temporal lobes.[3] Men and women appear to be equally affected.[1] FTD generally presents as a behavioral or language disorder with gradual onset.[4] Signs and symptoms tend to appear in late adulthood, typically between the ages of 45 and 65, although it can affect people younger or older than this.[1] Currently, no cure or approved symptomatic treatment for FTD exists, although some off-label drugs and behavioral methods are prescribed.[1]

Frontotemporal dementia
Brain MRI of a 65-year-old woman with frontotemporal dementia. Cortical and white matter atrophy of the frontal lobes is clear in all images.
SpecialtyPsychiatry, neurology
Causesfrontotemporal lobar degeneration

Features of FTD were first described by Arnold Pick between 1892 and 1906.[5] The name Pick's disease was coined in 1922.[6] This term is now reserved only for the behavioral variant of FTD, in which characteristic Pick bodies and Pick cells are present.[7][8] These were first described by Alois Alzheimer in 1911.[6] Common signs and symptoms include significant changes in social and personal behavior, disinhibition, apathy, blunting and dysregulation of emotions, and deficits in both expressive and receptive language.[9]

Each FTD subtype is relatively rare.[10] FTDs are mostly early onset syndromes linked to frontotemporal lobar degeneration (FTLD),[11] which is characterized by progressive neuronal loss predominantly involving the frontal or temporal lobes, and a typical loss of more than 70% of spindle neurons, while other neuron types remain intact.[12] The three main subtypes or variant syndromes are a behavioral variant (bvFTD) previously known as Pick's disease, and two variants of primary progressive aphasia (PPA): semantic (svPPA) and nonfluent (nfvPPA). Two rare distinct subtypes of FTD are neuronal intermediate filament inclusion disease (NIFID) and basophilic inclusion body disease (BIBD). Other related disorders include corticobasal syndrome (CBS or CBD), and FTD with amyotrophic lateral sclerosis (ALS).

Signs and symptoms

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Frontotemporal dementia is an early onset disorder that mostly occurs between the ages of 45 and 65,[13] but can begin earlier, and in 20–25% of cases onset is later.[11][14] Men and women appear to be equally affected.[15] It is the most common early presenting dementia.[16] FTD is the second most prevalent type of early onset dementia after Alzheimer's disease.[15][10]

The International Classification of Diseases recognizes the disease as causative to disorder affecting mental and behavioural aspects of the human organism. Dissociation from family, compulsive buying disorder (oniomania), vulgar speech characteristics, screaming, inability to control emotions, behavior, personality, and temperament are characteristic social display patterns.[17] A gradual onset and progression of changes in behavior or language deficits are reported to have begun several years prior to presentation to a neurologist.[15]

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The main subtypes of frontotemporal dementia are behavioral variant FTD (bvFTD), two variants of primary progressive aphasia – semantic dementia (svPPA) and progressive nonfluent aphasia (nfvPPA)[4][18] – as well as FTD associated with amyotrophic lateral sclerosis (FTD–ALS or FTD-MND).[15] Two distinct rare subtypes are neuronal intermediate filament inclusion disease (NIFID), and basophilic inclusion body disease (BIBD). Related disorders are corticobasal syndrome (CBS or CBD), and progressive supranuclear palsy (PSP).[15]

Behavioral variant frontotemporal dementia

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Behavioral variant frontotemporal dementia (BvFTD) was previously known as Pick's disease, and is the most common of the FTD types.[19][18] BvFTD is diagnosed four times as often as the PPA variants.[20] Behavior can change in BvFTD in either of two ways—it can change to being impulsive and disinhibited, acting in socially unacceptable ways; or it can change to being listless and apathetic.[21][22] About 12–13% of people with bvFTD develop motor neuron disease.[23]

The Pick bodies which are present in behavioral variant FTD are spherical inclusion bodies found in the cytoplasm of affected cells. They consist of tau fibrils as a major component together with a number of other protein products including ubiquitin and tubulin.[24]

Semantic dementia

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Semantic dementia (SD) is characterized by the loss of semantic understanding, resulting in impaired word comprehension. However, speech remains fluent and grammatical.[22]

Progressive nonfluent aphasia

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Progressive nonfluent aphasia (PNFA) is characterized by progressive difficulties in speech production.[22]

Neuronal intermediate filament inclusion disease

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Neuronal intermediate filament inclusion disease (NIFID) is a rare distinct variant. The inclusion bodies that are present in NIFID are cytoplasmic and made up of type IV intermediate filaments.[25][26] NIFID has an early age of onset between 23 and 56. Symptoms can include behavioural, and personality changes, memory and cognitive impairments, language difficulties, motor weakness, and extrapyramidal symptoms.[25] NIFID is one of the frontotemporal lobar degeneration (FTLD)-FUS proteopathies.[26] Imaging commonly shows atrophy in the frontotemporal region, and in part of the striatum in the basal ganglia. Post-mortem studies show a marked reduction in the caudate nucleus of the striatum; frontotemporal gyri are narrowed, with widened intervening sulci, and the lateral ventricles are enlarged.[25]

Basophilic inclusion body disease

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Another rare FTD variant, also a FTLD-FUS proteopathy, is basophilic inclusion body disease (BIBD).[27][28]

Other characteristics

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In later stages of FTD, the clinical phenotypes may overlap.[22] People with FTD tend to struggle with binge eating and compulsive behaviors.[29] Binge eating habits are often associated with changes in food preferences (cravings for more sweets, carbohydrates), eating inedible objects and snatching food from others. Recent findings from structural MRI research have indicated that eating changes in FTD are associated with atrophy (wasting) in the right ventral insula, striatum, and orbitofrontal cortex.[29]

People with FTD show marked deficiencies in executive functioning and working memory.[30] Most become unable to perform skills that require complex planning or sequencing.[31] In addition to the characteristic cognitive dysfunction, a number of primitive reflexes known as frontal release signs are often able to be elicited. Usually the first of these frontal release signs to appear is the palmomental reflex which appears relatively early in the disease course whereas the palmar grasp reflex and rooting reflex appear late in the disease course.[citation needed]

In rare cases, FTD can occur in people with amyotrophic lateral sclerosis (ALS), a motor neuron disease. As of 2005, the prognosis for people with ALS was worse when combined with FTD, shortening survival by about a year.[32]

Genetics

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A higher proportion of frontotemporal dementias seem to have a familial component than other neurodegenerative diseases such as Alzheimer's disease. More and more mutations and genetic variants are being identified all the time, needing constant updating of genetic influences.

  • Tau-positive frontotemporal dementia and parkinsonism linked to chromosome 17 (FTDP-17) is caused by mutations in the MAPT gene on chromosome 17 that encodes the tau protein.[33] It has been determined that there is a direct relationship between the type of tau mutation and the neuropathology of gene mutations. The mutations at the splice junction of exon 10 of tau lead to the selective deposition of the repetitive tau in neurons and glia. The pathological phenotype associated with mutations elsewhere in tau is less predictable, with both typical neurofibrillary tangles (consisting of both 3-repeat and 4-repeat tau) and Pick bodies (consisting of 3-repeat tau) having been described. The presence of tau deposits within glia is also variable in families with mutations outside of exon 10. This disease is now informally designated FTDP-17T. FTD shows a linkage to the region of the tau locus on chromosome 17, but it is believed that there are two loci leading to FTD within megabases of each other on chromosome 17.[34] The only other known autosomal dominant genetic cause of FTLD-tau is a hypomorphic mutation in VCP which is associated with a unique neuropathology called vacuolar tauopathy.[35]
  • FTD caused by FTLD-TDP43 has numerous genetic causes. Some cases are due to mutations in the GRN gene, also located on chromosome 17. Others are caused by hypomorphic VCP mutations, although these patients present with a complex picture of multisystem proteinopathy that can include amyotrophic lateral sclerosis, inclusion body myopathy, Paget's disease of bone, and FTD. The most recent addition to the list (as of 2019) was a hexanucleotide repeat expansion in intron 1 of C9ORF72.[36][37][38] Only one or two cases have been reported describing TARDBP (the TDP-43 gene) mutations in a clinically pure FTD (FTD without ALS).[citation needed]
  • Several other genes have been linked to this condition. These include CYLD, OPTN, SQSTM1 and TBK1.[39] These genes have been implicated in the autophagy pathway.
  • No genetic causes of FUS pathology in FTD have yet been reported.[citation needed]
  • Major alleles of TMEM106B SNPs have been found to be associated with risk of FTLD.[40]

Pathology

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Main article: Frontotemporal lobar degeneration

There are three main histological subtypes found at post-mortem: FTLD-tau, FTLD-TDP, and FTLD-FUS. In rare cases, patients with clinical FTD were found to have changes consistent with Alzheimer's disease on autopsy.[41] The most severe brain atrophy appears to be associated with behavioral variant FTD, and corticobasal degeneration.[42]

With regard to the genetic defects that have been found, repeat expansion in the C9orf72 gene is considered a major contribution to FTLD, although defects in the GRN and MAPT genes are also associated with it.[43]

DNA damage and the defective repair of such damages have been etiologically linked to various neurodegenerative diseases including FTD.[44]

Diagnosis

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FTD is traditionally difficult to diagnose owing to the diverse nature of the associated symptoms. Signs and symptoms are classified into three groups based on the affected functions of the frontal and temporal lobes:[8] These are behavioural variant frontotemporal dementia, semantic dementia, and progressive nonfluent aphasia. An overlap between symptoms can occur as the disease progresses and spreads through the brain regions.[14]

Structural MRI scans often reveal frontal lobe and/or anterior temporal lobe atrophy, but in early cases the scan may seem normal. Atrophy can be either bilateral or asymmetric.[13] Registration of images at different points of time (e.g., one year apart) can show evidence of atrophy that otherwise at individual time points may be reported as normal. Many research groups have begun using techniques such as magnetic resonance spectroscopy, functional imaging, and cortical thickness measurements in an attempt to offer an earlier diagnosis to the FTD patient. Fluorine-18-fluorodeoxyglucose positron emission tomography scans classically show frontal and/or anterior temporal hypometabolism, which helps differentiate the disease from Alzheimer's disease, as the PET scan in Alzheimer's disease classically shows biparietal hypometabolism.

Meta-analyses based on imaging methods have shown that frontotemporal dementia mainly affects a frontomedial network discussed in the context of social cognition or "theory of mind".[45] This is entirely in keeping with the notion that on the basis of cognitive neuropsychological evidence, the ventromedial prefrontal cortex is a major locus of dysfunction early on in the course of the behavioural variant of frontotemporal degeneration.[46] The language subtypes of FTLD (semantic dementia and progressive nonfluent aphasia) can be regionally dissociated by imaging approaches in vivo.[47]

The confusion between Alzheimer's and FTD is justifiable due to the similarities between their initial symptoms. Patients do not have difficulty with movement and other motor tasks.[48] As FTD symptoms appear, it is difficult to differentiate between a diagnosis of Alzheimer's disease and FTD. There are distinct differences in the behavioral and emotional symptoms of the two dementias, notably, the blunting of affect seen in FTD patients.[13] In the early stages of FTD, anxiety and depression are common, which may result in an ambiguous diagnosis. However, over time, these ambiguities fade away as this dementia progresses and defining symptoms of apathy, unique to FTD, start to appear.[citation needed]

Recent studies over several years have developed new criteria for the diagnosis of behavioral variant frontotemporal dementia (bvFTD). The confirmatory diagnosis is made by brain biopsy, but other tests can be used to help, such as MRI, EEG, CT, and physical examination and history.[49] As of 2011, six distinct clinical features have been identified as symptoms of bvFTD.[50]

  1. Disinhibition
  2. Apathy / Inertia
  3. Loss of Sympathy / Empathy
  4. Perseverative / Compulsive behaviors
  5. Hyperorality
  6. Dysexecutive neuropsychological profile

Of the six features, three must be present in a patient to diagnose one with possible bvFTD. Similar to standard FTD, the primary diagnosis stems from clinical trials that identify the associated symptoms, instead of imaging studies.[50] The above criteria are used to distinguish bvFTD from disorders such as Alzheimer's and other causes of dementia. In addition, the criteria allow for a diagnostic hierarchy distinguished possible, probable, and definite bvFTD based on the number of symptoms present.[50]

A 2021 study, determined that using cerebrospinal fluid (CSF) biomarkers of pathologic amyloid plaques, tangles, and neurodegeneration, collectively called ATN, can be useful in diagnosing FTD.[51]

Neuropsychological tests

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The progression of the degeneration caused by bvFTD may follow a predictable course. The degeneration begins in the orbitofrontal cortex and medial aspects such as ventromedial prefrontal cortex. In later stages, it gradually expands its area to the dorsolateral prefrontal cortex and the temporal lobe.[52] Thus, the detection of dysfunction of the orbitofrontal cortex and ventromedial cortex is important in the detection of early stage bvFTD. As stated above, a behavioural change may occur before the appearance of any atrophy in the brain in the course of the disease. Because of that, image scanning such as MRI can be insensitive to the early degeneration and it is difficult to detect early-stage bvFTD.[citation needed]

In neuropsychology, there is an increasing interest in using neuropsychological tests such as the Iowa gambling task or Faux Pas Recognition test as an alternative to imaging for the diagnosis of bvFTD.[53] Both the Iowa gambling task and the Faux Pas test are known to be sensitive to dysfunction of the orbitofrontal cortex.[citation needed]

The Faux Pas Recognition test is intended to measure one's ability to detect faux pas types of social blunders (accidentally making a statement or an action that offends others). It is suggested that people with orbitofrontal cortex dysfunction show a tendency to make social blunders due to a deficit in self-monitoring.[54] Self-monitoring is the ability of individuals to evaluate their own behavior to make sure that their behavior is appropriate in particular situations. The impairment in self-monitoring leads to a lack of social emotion signals. The social emotions such as embarrassment are important in the way that they alert the individual to adapt social behavior in an appropriate manner to maintain relationships with others. Though patients with damage to the OFC retain intact knowledge of social norms, they fail to apply it to actual behavior, because they fail to generate social emotions that promote adaptive social behavior.[54]

The other test, the Iowa gambling task, is a psychological test intended to simulate real-life decision making. The underlying concept of this test is the somatic marker hypothesis. This hypothesis argues that when people have to make complex uncertain decisions, they employ both cognitive and emotional processes to assess the values of the choices available to them. Each time a person makes a decision, both physiological signals and evoked emotion (somatic markers) are associated with their outcomes, and this accumulates as experience. People tend to choose the choice which might produce the outcome reinforced with positive stimuli; thus it biases decision-making towards certain behaviors while avoiding others.[55] It is thought that somatic markers are processed in the orbitofrontal cortex.[citation needed]

The symptoms observed in bvFTD are caused by dysfunction of the orbitofrontal cortex; thus these two neuropsychological tests might be useful in detecting early-stage bvFTD. However, as self-monitoring and somatic marker processes are so complex, it likely involves other brain regions. Therefore, neuropsychological tests are sensitive to the dysfunction of orbitofrontal cortex, yet are not specific to it. The weakness of these tests is that they do not necessarily show dysfunction of the orbitofrontal cortex.[citation needed]

In order to solve this problem, some researchers have combined neuropsychological tests which detect the dysfunction of orbitofrontal cortex into one grouping, so that it increases its specificity to the degeneration of the frontal lobe, in order to detect early-stage bvFTD. They invented the Executive and Social Cognition Battery which comprises five neuropsychological tests:[53]

The result has shown that this combined test is more sensitive in detecting the deficits in early bvFTD.[53]

Management

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Currently, there is no cure for FTD. Treatments are available to manage the behavioral symptoms. Rehabilitiation services supporting every day functioning have demonstrated some positive results, in particular the Tailored Activity Programme, which is occupational therapy based. Positive Behaviour Support (PBS) has also been identified as potentially beneficial for people with bvFTD.[56] Disinhibition and compulsive behaviors can be controlled by selective serotonin reuptake inhibitors (SSRIs).[57][58] Agitation can be controlled with small doses of atypical antipsychotics.[59] Although Alzheimer's and FTD share certain symptoms, they cannot be treated with the same pharmacological agents because the cholinergic systems are not affected in FTD.[13]

Because FTD often occurs in relatively younger adults (i.e. in their 40s or 50s), it can severely affect families. Patients often still have children living in the home.[citation needed]

Prognosis

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Symptoms of frontotemporal dementia progress at a rapid, steady rate. Patients with the disease can survive for 2–20 years. Eventually patients will need 24-hour care for daily function.[60]

Cerebrospinal fluid leaks are a known cause of reversible frontotemporal dementia.[61]

History

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Features of FTD were first described by the Czech psychiatrist Arnold Pick between 1892 and 1906.[5][62] The name Pick's disease was coined in 1922.[6] This term is now reserved only for behavioral variant FTD which shows the presence of the characteristic Pick bodies and Pick cells,[7][8] which were first described by Alois Alzheimer in 1911.[6]

In 1989, Snowden suggested the term semantic dementia to describe the patient with predominant left temporal atrophy and aphasia that Pick described. The first research criteria for FTD, "Clinical and neuropathological criteria for frontotemporal dementia. The Lund and Manchester Groups", was developed in 1994. The clinical diagnostic criteria were revised in the late 1990s, when the FTD spectrum was divided into a behavioral variant, a nonfluent aphasia variant, and a semantic dementia variant.[20] The most recent revision of the clinical research criteria was by the International Behavioural Variant FTD Criteria Consortium in 2011.[50]

Notable cases

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People who have been diagnosed as having FTD (often referred to as Pick's disease in cases of the behavioral variant) include:

See also

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References

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