Creutzfeldt–Jakob disease

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Creutzfeldt–Jakob disease
Other namesClassic Creutzfeldt–Jakob disease
Supportive care[4] as this condition is untreatable
MedicationFor pain relief: Morphine, Methadone
PrognosisUniversally fatal[4]
Frequency1 per million per year[4]

Creutzfeldt–Jakob disease (CJD), also known as subacute spongiform encephalopathy or neurocognitive disorder due to prion disease, is a fatal

brain disorder.[4][1] Early symptoms include memory problems, behavioral changes, poor coordination, and visual disturbances.[4] Later symptoms include dementia, involuntary movements, blindness, weakness, and coma.[4] About 70% of people die within a year of diagnosis.[4] The name Creutzfeldt–Jakob disease was introduced by Walther Spielmeyer in 1922, after the German neurologists Hans Gerhard Creutzfeldt and Alfons Maria Jakob.[6]

CJD is caused by a type of abnormal shaping of a protein known as a

There is no specific treatment for CJD.

sodium valproate may help with involuntary movements.[4] CJD affects about one person per million people per year.[4] Onset is typically around 60 years of age.[4] The condition was first described in 1920.[4] It is classified as a type of transmissible spongiform encephalopathy.[11] Inherited CJD accounts for about 10% of prion disease cases.[8] Sporadic CJD is different from bovine spongiform encephalopathy (mad cow disease) and variant Creutzfeldt–Jakob disease (vCJD).[12]

Signs and symptoms

The first symptom of CJD is usually rapidly progressive

posture. In most people with CJD, these symptoms are accompanied by involuntary movements. The duration of the disease varies greatly, but sporadic (non-inherited) CJD can be fatal within months or even weeks.[15] Most affected people die six months after initial symptoms appear, often of pneumonia due to impaired coughing reflexes. About 15% of people with CJD survive for two or more years.[16]

The symptoms of CJD are caused by the progressive death of the brain's nerve cells, which are associated with the build-up of abnormal prion proteins forming in the brain. When brain tissue from a person with CJD is examined under a microscope, many tiny holes can be seen where the nerve cells have died. Parts of the brain may resemble a sponge where the prions were infecting the areas of the brain.[17]

Cause

CJD is a type of transmissible spongiform encephalopathy (TSE), which are caused by prions.[7] Prions are misfolded proteins that occur in the neurons of the central nervous system (CNS). They are thought to affect signaling processes, damaging neurons and resulting in degeneration that causes the spongiform appearance in the affected brain.[18]

The CJD prion is dangerous because it promotes

prion diseases.[20]

Transmission

MRI of iCJD because of growth hormone

The defective protein can be transmitted by contaminated harvested human brain products, corneal grafts,[21] dural grafts,[22] or electrode[23] implants and human growth hormone.[24]

It can be familial (fCJD); or it may appear without clear risk factors (sporadic form: sCJD). In the familial form, a

PRNP, in that family. All types of CJD are transmissible irrespective of how they occur in the person.[25]

It is thought that humans can contract the variant form of the disease by eating food from animals infected with bovine spongiform encephalopathy (BSE), the bovine form of TSE also known as mad cow disease. However, it can also cause sCJD in some cases.[26][27]

Cannibalism has also been implicated as a transmission mechanism for abnormal prions, causing the disease known as kuru, once found primarily among women and children of the Fore people in Papua New Guinea, who previously engaged in funerary cannibalism.[28] While the men of the tribe ate the muscle tissue of the deceased, women and children consumed other parts, such as the brain, and were more likely than men to contract kuru from infected tissue.[29]

Prions, the

infectious agent of CJD, may not be inactivated by means of routine surgical instrument sterilization procedures. The World Health Organization and the US Centers for Disease Control and Prevention recommend that instrumentation used in such cases be immediately destroyed after use; short of destruction, it is recommended that heat and chemical decontamination be used in combination to process instruments that come in contact with high-infectivity tissues. Thermal depolymerization also destroys prions in infected organic and inorganic matter, since the process chemically attacks protein at the molecular level, although more effective and practical methods involve destruction by combinations of detergents and enzymes similar to biological washing powders.[30]

Genetics

People can also develop CJD because they carry a mutation of the gene that codes for the prion protein (PRNP), located on

iatrogenic and less than 1% variant."[33]

Diagnosis

MRI
, the obvious precipitation of prion protein in the brain is visible.

Testing for CJD has historically been problematic, due to nonspecific nature of early symptoms and difficulty in safely obtaining brain tissue for confirmation. The diagnosis may initially be suspected in a person with rapidly progressing dementia, particularly when they are also found with the characteristic medical

Further testing can support the diagnosis and may include:

In recent years, studies have shown that the tumour marker

neuron-specific enolase (NSE) is often elevated in CJD cases; however, its diagnostic utility is seen primarily when combined with a test for the 14-3-3 protein.[42] As of 2010, screening tests to identify infected asymptomatic individuals, such as blood donors, are not yet available, though methods have been proposed and evaluated.[43]

Imaging

Imaging of the brain may be performed during medical evaluation, both to rule out other causes and to obtain supportive evidence for diagnosis. Imaging findings are variable in their appearance, and also variable in sensitivity and specificity.[44] While imaging plays a lesser role in diagnosis of CJD,[45] characteristic findings on brain MRI in some cases may precede onset of clinical manifestations.[46]

Brain MRI is the most useful imaging modality for changes related to CJD. Of the MRI sequences, diffuse-weighted imaging sequences are most sensitive.[47] Characteristic findings are as follows:

dwMRI, FDG PET and post mortem histology from a patient who presented with sCJD aged 66
  • Focal or diffuse diffusion-restriction involving the cerebral cortex and/or basal ganglia. In about 24% of cases DWI shows only cortical hyperintensity; in 68%, cortical and subcortical abnormalities; and in 5%, only subcortical anomalies.[48] The most iconic and striking cortical abnormality has been called "cortical ribboning" or "cortical ribbon sign" due to hyperintensities resembling ribbons appearing in the cortex on MRI.[49] The involvement of the thalamus can be found in sCJD, is even stronger and constant in vCJD.[50]
  • Varying degree of symmetric T2 hyperintense signal changes in the
    occipital cortex.[45]
  • Cerebellar atrophy

Brain FDG PET-CT tends to be markedly abnormal, and is increasingly used in the investigation of dementias.

Histopathology

Spongiform change in CJD

Testing of tissue remains the most definitive way of confirming the diagnosis of CJD, although it must be recognized that even biopsy is not always conclusive.[52]

In one-third of people with sporadic CJD, deposits of "prion protein (scrapie)",

PrPSc, can be found in the skeletal muscle and/or the spleen.[53] Diagnosis of vCJD can be supported by biopsy of the tonsils, which harbor significant amounts of PrPSc; however, biopsy of brain tissue is the definitive diagnostic test for all other forms of prion disease. Due to its invasiveness, biopsy will not be done if clinical suspicion is sufficiently high or low. A negative biopsy does not rule out CJD, since it may predominate in a specific part of the brain.[54]

The classic

histologic appearance is spongiform change in the gray matter: the presence of many round vacuoles from one to 50 micrometers in the neuropil, in all six cortical layers in the cerebral cortex or with diffuse involvement of the cerebellar molecular layer.[55] These vacuoles appear glassy or eosinophilic and may coalesce. Neuronal loss and gliosis are also seen.[56] Plaques of amyloid-like material can be seen in the neocortex in some cases of CJD.[57]

However, extra-neuronal vacuolization can also be seen in other disease states. Diffuse cortical vacuolization occurs in Alzheimer's disease, and superficial cortical vacuolization occurs in ischemia and frontotemporal dementia. These vacuoles appear clear and punched-out. Larger vacuoles encircling neurons, vessels, and glia are a possible processing artifact.[54]

Classification

Types of CJD include:[58]

  • Sporadic (sCJD), caused by the spontaneous misfolding of prion-protein in an individual.[32] This accounts for 85% of cases of CJD.[59]
  • Familial (fCJD), caused by an inherited mutation in the prion-protein gene.[58] This accounts for the majority of the other 15% of cases of CJD.[59]
  • Acquired CJD, caused by contamination with tissue from an infected person, usually as the result of a medical procedure (
    prions.[58][61]
Clinical and pathologic characteristics[62]
Characteristic Classic CJD Variant CJD
Median age at death 68 years 28 years
Median duration of illness 4–5 months 13–14 months
Clinical signs and symptoms Dementia; early neurologic signs Prominent psychiatric/behavioral symptoms; painful
dysesthesias
; delayed neurologic signs
Periodic sharp waves on
electroencephalogram
Often present Often absent
Signal hyperintensity in the
FLAIR MRI
Often present Often absent
Pulvinar sign-bilateral high signal intensities on axial FLAIR MRI. Also posterior thalamic involvement on sagittal T2 sequences Not reported Present in >75% of cases
Immunohistochemical analysis
of brain tissue
Variable accumulation. Marked accumulation of protease-resistant prion protein
Presence of agent in
lymphoid
tissue
Not readily detected Readily detected
Increased
immunoblot
analysis of protease-resistant prion protein
Not reported Marked accumulation of protease-resistant prion protein
Presence of amyloid plaques in brain tissue May be present May be present

Treatment

As of 2023, there is no cure or effective treatment for CJD.[63] Some of the symptoms like twitching can be managed, but otherwise treatment is palliative care.[63] Psychiatric symptoms like anxiety and depression can be treated with sedatives and antidepressants. Myoclonic jerks can be handled with clonazepam or sodium valproate. Opiates can help in pain.[64] Seizures are very uncommon but can nevertheless be treated with antiepileptic drugs.[65]

Prognosis

The condition is universally fatal. As of 1981, no one was known to have lived longer than 2.5 years after the onset of CJD symptoms.[66] In 2011, Jonathan Simms, a Northern Irish man who lived 10 years after his diagnosis, was reported to be one of the world's longest survivors of variant Creutzfeldt–Jakob disease (vCJD). [67]

Epidemiology

CDC monitors the occurrence of CJD in the United States through periodic reviews of national mortality data. According to the CDC:[68][69]

  • CJD occurs worldwide at a rate of about 1 case per million population per year.
  • On the basis of mortality surveillance from 1979 to 1994, the annual
    million
    people in the United States.
  • In the United States, CJD deaths among people younger than 30 years of age are extremely rare (fewer than five deaths per
    billion
    per year).
  • The disease is found most frequently in people 55–65 years of age, but cases can occur in people older than 90 years and younger than 55 years of age.
  • In more than 85% of cases, the duration of CJD is less than one year (median: four months) after the onset of symptoms.

Further information from the CDC:[70]

  • Risk of developing CJD increases with age.
  • CJD incidence was 3.5 cases per million among those over 50 years of age between 1979 and 2017.
  • Approximately 85% of CJD cases are sporadic and 10-15% of CJD cases are due to inherited mutations of the prion protein gene.
  • CJD deaths and age-adjusted death rate in the United States indicate an increasing trend in the number of deaths between 1979 and 2017.

Although not fully understood, additional information suggests that CJD rates in African American and nonwhite groups are lower than in whites. While the mean onset is approximately 67 years of age, cases of sCJD have been reported as young as 17 years and over 80 years of age. Mental capabilities rapidly deteriorate and the average amount of time from onset of symptoms to death is 7 to 9 months.[71]

According to a 2020 systematic review on the international epidemiology of CJD:[72]

  • Surveillance studies from 2005 and later show the estimated global incidence is 1–2 cases per million population per year.
  • Sporadic CJD (sCJD) incidence increased from the years 1990–2018 in the UK.
  • Probable or definite sCJD deaths also increased from the years 1996–2018 in twelve additional countries.
  • CJD incidence is greatest in those over the age of 55 years old, with an average age of 67 years old.

The intensity of CJD surveillance increases the number of reported cases, often in countries where CJD epidemics have occurred in the past and where surveillance resources are greatest.

nephropathy, general dementia, and hyperparathyroidism.[72]

History

The disease was first described by German

neurologists Hans Gerhard Creutzfeldt in 1920 and shortly afterward by Alfons Maria Jakob, giving it the name Creutzfeldt–Jakob. Some of the clinical findings described in their first papers do not match current criteria for Creutzfeldt–Jakob disease, and it has been speculated that at least two of the people in initial studies had a different ailment.[73] An early description of familial CJD stems from the German psychiatrist and neurologist Friedrich Meggendorfer (1880–1953).[74][75] A study published in 1997 counted more than 100 cases worldwide of transmissible CJD and new cases continued to appear at the time.[76]

The first report of suspected iatrogenic CJD was published in 1974. Animal experiments showed that corneas of infected animals could transmit CJD, and the causative agent spreads along visual pathways. A second case of CJD associated with a corneal transplant was reported without details. In 1977, CJD transmission caused by silver electrodes previously used in the brain of a person with CJD was first reported. Transmission occurred despite the decontamination of the electrodes with ethanol and formaldehyde. Retrospective studies identified four other cases likely of similar cause. The rate of transmission from a single contaminated instrument is unknown, although it is not 100%. In some cases, the exposure occurred weeks after the instruments were used on a person with CJD.[76] In the 1980s it was discovered that Lyodura, a dura mater transplant product, was shown to transmit CJD from the donor to the recipient. This led to the product being banned in Canada but it was used in other countries such as Japan until 1993.[77]

A review article published in 1979 indicated that 25 dura mater cases had occurred by that date in Australia, Canada, Germany, Italy, Japan, New Zealand, Spain, the United Kingdom, and the United States.[76]

By 1985, a series of case reports in the United States showed that when injected, cadaver-extracted pituitary

human growth hormone could transmit CJD to humans.[76]

In 1992, it was recognized that human gonadotropin administered by injection could also transmit CJD from person to person.[76]

Stanley B. Prusiner of the University of California, San Francisco (UCSF) was awarded the Nobel Prize in Physiology or Medicine in 1997 "for his discovery of Prions—a new biological principle of infection".[78]

Yale University neuropathologist Laura Manuelidis has challenged the prion protein (PrP) explanation for the disease. In January 2007, she and her colleagues reported that they had found a virus-like particle in naturally and experimentally infected animals. "The high infectivity of comparable, isolated virus-like particles that show no intrinsic PrP by antibody labeling, combined with their loss of infectivity when nucleic acid–protein complexes are disrupted, make it likely that these 25-nm particles are the causal TSE virions".[79]

Australia

Australia has documented 10 cases of healthcare-acquired CJD (iatrogenic or ICJD). Five of the deaths resulted after the patients, who were in treatment either for infertility or short stature, were treated using contaminated pituitary extract hormone but no new cases have been noted since 1991. The other five deaths occurred due to dura grafting procedures that were performed during brain surgery, in which the covering of the brain is repaired. There have been no other ICJD deaths documented in Australia due to transmission during healthcare procedures.[80]

New Zealand

A case was reported in 1989 in a 25-year-old man from New Zealand, who also received dura mater transplant.[76] Five New Zealanders have been confirmed to have died of the sporadic form of Creutzfeldt–Jakob disease (CJD) in 2012.[81]

United States

In 1988, there was a confirmed death from CJD of a person from Manchester, New Hampshire. Massachusetts General Hospital believed the person acquired the disease from a surgical instrument at a podiatrist's office. In 2007, Michael Homer, former Vice President of Netscape, had been experiencing consistent memory problems which led to his diagnosis.[82] In September 2013, another person in Manchester was posthumously determined to have died of the disease. The person had undergone brain surgery at Catholic Medical Center three months before his death, and a surgical probe used in the procedure was subsequently reused in other operations. Public health officials identified thirteen people at three hospitals who may have been exposed to the disease through the contaminated probe, but said the risk of anyone's contracting CJD is "extremely low".[83][84][85] In January 2015, former speaker of the Utah House of Representatives Rebecca D. Lockhart died of the disease within a few weeks of diagnosis.[86] John Carroll, former editor of The Baltimore Sun and Los Angeles Times, died of CJD in Kentucky in June 2015, after having been diagnosed in January.[87] American actress Barbara Tarbuck (General Hospital, American Horror Story) died of the disease on December 26, 2016.[88] José Baselga, clinical oncologist having headed the AstraZeneca Oncology division, died in Cerdanya, March 21, 2021, from CJD.[89]

Research

Diagnosis

Treatment

  • Pentosan polysulphate (PPS) was thought to slow the progression of the disease, and may have contributed to the longer than expected survival of the seven people studied.[93] The CJD Therapy Advisory Group to the UK Health Departments advises that data are not sufficient to support claims that pentosan polysulphate is an effective treatment and suggests that further research in animal models is appropriate.[94] A 2007 review of the treatment of 26 people with PPS finds no proof of efficacy because of the lack of accepted objective criteria, but it was unclear to the authors whether that was caused by PPS itself.[95] In 2012 it was claimed that the lack of significant benefits has likely been caused because of the drug being administered very late in the disease in many patients.[96]
  • Use of
    mice. The RNA blocks production of the protein that the CJD process transforms into prions.[97][98]
  • Both amphotericin B and doxorubicin have been investigated as treatments for CJD, but as yet there is no strong evidence that either drug is effective in stopping the disease. Further study has been taken with other medical drugs, but none are effective. However, anticonvulsants and anxiolytic agents, such as valproate or a benzodiazepine, may be administered to relieve associated symptoms.[16]
  • Quinacrine, a medicine originally created for malaria, has been evaluated as a treatment for CJD. The efficacy of quinacrine was assessed in a rigorous clinical trial in the UK and the results were published in Lancet Neurology,[99]
    and concluded that quinacrine had no measurable effect on the clinical course of CJD.
  • Astemizole, a medication approved for human use, has been found to have anti-prion activity and may lead to a treatment for Creutzfeldt–Jakob disease.[100]
  • A
    prion protein (PrP) was given to six people with Creutzfeldt–Jakob disease in an early-stage clinical trial conducted from 2018 to 2022. The treatment appeared to be well-tolerated and was able to access the brain, where it might have helped to clear PrPC. While the treated patients still showed progressive neurological decline, and while none of them survived longer than expected from the normal course of the disease, the scientists at University College London who conducted the study see these early-stage results as encouraging and suggest to conduct a larger study, ideally at the earliest possible intervention.[101]

See also

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External links