Jia Zheng
Xiaohong Wu*- Geriatric Medicine Center, Key Laboratory of Endocrine Gland Diseases of Zhejiang Province, Department of Endocrinology, Zhejiang Provincial People’s Hospital (Affiliated People’s Hospital, Hangzhou Medical College), Hangzhou, Zhejiang, China
Chorea is a movement disorder involving involuntary movements of muscles of the face, neck, and limbs, usually caused by basal ganglia lesions. As an important part of the presentation of many neurological diseases, chorea is also an unusual manifestation of endocrine diseases and can be challenging to diagnose. Although the most common etiology of chorea is genetic, it is vital to identify acquired or symptomatic chorea, as these are potentially treatable conditions. This review summarizes the latest developments in various endocrine disease-related chorea, which will help clinicians to correctly identify and accurately treat it.
1 Introduction
Chorea refers to involuntary movements of limbs, trunk, neck, or face that rapidly flit from region to region in an irregular, flowing, non-stereotyped pattern (1). It is a relatively rare movement disorder characterized as involuntary, irregularly time, non-repetitive, purposeless, randomly distributed, and abrupt in character, which is commonly associated with Huntington’s disease or treatment with levodopa (2, 3). Therefore, we consider neurological diseases first when analyzing the etiology of chorea. However, chorea has recently been discovered to be a clinical manifestation of endocrine diseases such as hyperthyroidism and diabetes, and it may even be the initial symptom (4, 5). In clinical practice, endocrine disease-related chorea is uncommon and frequently misdiagnosed. The precise diagnosis of the etiology of chorea can better facilitate appropriate treatments and improve the life quality of patients (4, 6). This review summarizes the current research status of endocrine disease-related chorea (Figure 1), aiming to help clinicians correctly diagnose and precisely treat it.
Figure 1 Chorea due to endocrine diseases. The picture depicts the different endocrine diseases that may manifest chorea (drawn by Figdraw).
2 Thyroid-related chorea
Thyroid metabolism plays an important role in human development, particularly the formation and functioning of the central and peripheral nervous systems. Thyroid diseases of genetic or acquired origin can lead to neurological disorders such as encephalopathy, myoclonus, and chorea (7, 8).
2.1 Hashimoto’s thyroiditis-related chorea
Dance-like movements caused by autoimmune encephalopathy associated with Hashimoto’s disease were first documented by Brain et al. (7) in 1966, and similar cases have occasionally been reported over the following two decades (9–12). Bilateral chorea is frequently one of the first symptoms in many patients, particularly adult females (13, 14). A prospective study investigated unexplained encephalopathy with detectable anti-thyroid antibodies, with an estimated prevalence of 2.1/100,000 (15). Chorea caused by Hashimoto’s encephalopathy is even rarer and difficult to evaluate (16).
The defining characteristics and pathogenesis of Hashimoto’s encephalopathy are still a common subject of debate. The mainstream view considers the condition a steroid-responsive encephalopathy associated with autoimmune thyroiditis and high titers of anti-thyroid antibodies, with or without thyroid dysfunction (9, 13, 17). The main hypotheses include the cerebral vasculitis theory (7, 18–21), the hormonal dysregulation theory (22–24), and the theory that autoantibodies act directly against various thyroid and extra-thyroid antigens.
High titers of anti-thyroid antibodies, particularly anti-thyroid peroxidase antibodies, are typically considered diagnostic. Although no characteristic neuroimaging signs are associated with the condition, other toxic, metabolic, and infectious causes of encephalopathy can be ruled out by neuroimaging. Most reported cases of Hashimoto’s thyroiditis-associated chorea have responded to a high-dose corticosteroid treatment, which is used as a criterion for disease definition (25–27). Treatment of Hashimoto’s thyroiditis-associated chorea usually consists of IV glucocorticoid for a few days followed by high-dose oral glucocorticoid tapered based on clinical improvement (28, 29). Most patients show a rapid response, but if left untreated or treatment is suspended, severe psychoneurological deficits may result.
2.2 Hyperthyroidism-related chorea
The most common neurological dysfunction associated with hyperthyroidism is tremor, but chorea, myoclonus, and spastic trunk flexion have also been reported (30–32). Chorea caused by hyperthyroidism or subclinical hyperthyroidism due to Graves’ disease, toxic multinodular goiter, or other medical and pharmacological origins is well-known but relatively rare, with a prevalence of less than 2% (33–35). The symptoms of chorea can be bilateral or unilateral (36–38). Its pathogenesis is unclear; the prevailing view is that hyperthyroidism-related chorea is related to complex dysfunction within the basal ganglia system. The mechanism could involve the alteration of dopamine metabolism in the striatum or alter basal ganglia function by affecting the metabolism of other neurotransmitters or inducing dysregulation of genes (35, 39, 40). No characteristic imaging signs have been associated with chorea caused by hyperthyroidism; instead, diagnosis typically involves the laboratory test results and imaging findings typical of hyperthyroidism combined with the effectiveness of the anti-hyperthyroid medication. In most patients, chorea symptoms gradually disappear when hyperthyroidism is controlled by using antithyroid drugs (34). At the same time, the use of drugs such as clonazepam and haloperidol can assist in the control of chorea symptoms (32, 35).
2.3 Hypothyroidism-related chorea
A close relationship exists between hypothyroidism and neurological deficits. Hereditary and acquired hypothyroidism can cause cognitive impairment, depression, and other neurological symptoms (41). After early screening and prophylactic treatment of congenital hypothyroidism, most children do not show any other signs. However, some children eventually develop choreoathetoid and respiratory diseases. This disorder is known as benign hereditary chorea (BHC) (42).
BHC is a rare autosomal dominant disorder caused by mutations in the NKX2-1 (TTF1 or TITF1) gene. More than 100 NKX2-1 mutations have been reported (43, 44). BHC usually develops in childhood, rarely in adolescence, and tends to resolve in adulthood (45). Approximately 30-50% of patients with NKX2-1 gene mutations have the classic brain-lung-thyroid triad (41), which manifests as neurological symptoms, such as chorea and dystonia in early infancy, along with abnormal thyroid function and respiratory diseases, such as neonatal respiratory distress syndrome and interstitial lung disease. This observation suggests that chorea and pulmonary symptoms in hypothyroid patients can be attributed to NKX2-1 gene mutations.
Domitille et al. (43) concluded that chorea in patients with BHC is mainly an isolated sign. Still, it may also be associated with dystonia, myoclonus, and tics, with chorea preceding hypotonia suggestive of BHC. Laboratory tests on patients with BHC may indicate abnormal thyroid function, including elevated levels of thyroid-stimulating hormone and reduced or normal levels of thyroxine. The neuroimaging findings of most patients with BHC are unremarkable. Abnormal pituitary saddle morphology was reported in seven patients with BHC (46). Although not all patients with BHC display consistent involvement of all three organs (brain, lung, and thyroid), many children develop interstitial lung disease. LeMoine et al. (47) suggested that high-resolution Computed Tomography of the thoracic region is helpful for disease diagnosis and that the most common imaging feature is ground-glass-like changes in the lungs. In conclusion, differential diagnosis of BHC remains challenging in many cases. Infantile chorea and its possible association with thyroid or lung disease may aid in differentiating BHC from other similar hereditary movement diseases, and patients should be proactively tested for NKX2-1 gene mutations.
Many treatment strategies have been developed for chorea, but most are largely ineffective, with only a few reporting effectiveness (48). Asmus et al. (49) reported that levodopa (20 mg/kg/d) significantly improved gait and reduced chorea in two patients. Nakamura et al. (50) reported that the dopamine agonist ropinirole hydrochloride (2 mg/d) reduced chorea in patients. Domitille et al. (43) reported beneficial effects of tetrabenazine in children (0.5 mg/kg/d) and adults (37.5 mg/d) on chorea and motor function. Gauquelin et al. (51) suggested that dyskinesia in BHC may respond to controlled-release methylphenidate hydrochloride (up to 30 mg/d). It is also recommended to use thyroxine replacement therapy for hypothyroidism and regular monitoring of thyroid function, and pulmonary symptoms should be treated symptomatically. Although no cure is available for BHC, supportive interventions can alleviate its manifestations.
3 Parathyroid-related chorea
Hyperparathyroidism-caused chorea was documented in one case (52); more information is missing, and the authenticity of the data is subject to verification. In contrast, hypoparathyroidism-caused chorea, including idiopathic hypoparathyroidism (53, 54), pseudohypoparathyroidism (55), and medically-induced hypoparathyroidism (56), is relatively common. Parathyroid dysfunction-related chorea is mainly caused by abnormalities in calcium, magnesium, and phosphorus metabolism, the mechanisms of which are described below. Hypoparathyroidism-caused chorea can be associated with the rare imaging finding of bilateral calcification in the basal ganglia (57). Hypothyroidism identification typically relies on a combination of relevant laboratory tests of parameters, such as parathyroid hormone and electrolyte levels, and questions about the patient’s medical history. After alleviating parathyroid dysfunction and impaired mineral metabolism by treated with vitamin D and calcium supplementation, chorea symptoms may be relieved (58).
4 Blood glucose-related chorea
Hyperglycemic non-ketotic hemichorea, known as diabetic striatopathy (DS), has gradually been recognized since Bidwell (59) first reported the development of hemiplegic chorea in patients with diabetes in 1960. Although the neurological manifestations of DS include stroke and peripheral neuropathy, chorea is relatively rare. Coupled with the fact that its imaging features can be easily misdiagnosed, its incidence is likely underestimated at approximately <1/100,000 (60). The disease is common in older Asian women with type 2 diabetes (61, 62). A recent meta-analysis suggested that 96.6% of 176 patients with DS had type 2 diabetes. Patients from Asia accounted for 71.6% of the total sample, followed by Europe (8.5%) and America (4%). The average age was 67.6 ± 15.9 years, with a male-to-female ratio of 1:1.7 (63).
The pathogenesis of DS is currently believed to involve ischemic hemorrhage (64, 65), metabolic disturbances (66, 67), ionic deposition (62, 68, 69), autoimmune inflammatory responses (70–72), neurodegeneration (73, 74), dopaminergic and estrogenic alterations (75, 76), and genetic susceptibility (77). Patients with DS tend to present with unilateral symptoms. In addition, lateralized chorea can occur in patients with hyperglycemic ketosis (78, 79) or hypoglycemia (80); thus, it cannot be attributed to a single cause.
Imaging often shows high density on Computed Tomography scans of the striatum and high signal intensity on Magnetic Resonance Imaging (T1-weighted image) (81–83). However, patients may present with chorea symptoms in the absence of imaging abnormalities or vice versa. Therefore, imaging studies must be performed with a larger sample size and long-term follow-up. Diagnosis of DS is typically one of exclusion; other causes can be excluded in patients with elevated blood glucose and glycated hemoglobin levels, negative urinary ketone bodies, and no differences in the levels of electrolytes, autoantibodies, rheumatoid immune markers, thyroid function, serum copper, and copper cyanide.
DS Treatment primarily involves blood glucose control, and most patients experience gradual improvement over several days or weeks. If chorea symptoms do not resolve in the absence of hyperglycemia, haloperidol, pimozide, and other dopamine receptor antagonists can be administered (63, 78, 81, 84). However, as dopamine receptor antagonists can cause delayed dyskinesia, treatment dosage should be tailored to meet individual requirements.
5 Electrolyte-related chorea
Changes in electrolyte levels may affect brain areas with high metabolic rates, such as the basal ganglia, which can trigger a range of neurological symptoms. However, these changes are reversible in the absence of structural damage (5).
5.1 Hypercalcemia or hypocalcemia
Hypercalcemia causes chorea by stimulating dopamine release, although this is relatively rare (85). Severe hypocalcemia can increase excitability in the brain, which may result in neurological symptoms such as tics, seizures, delirium, and, in rare cases, chorea (86). Hypocalcemia-induced chorea is most commonly observed in hypoparathyroidism (87). Other reported causes of chorea secondary to hypocalcemia include malabsorption and bisphosphonate therapy (88–90). The mechanism by which hypocalcemia causes extrapyramidal symptoms remains unknown. Calcium deposits in the basal ganglia were initially believed to be responsible for chorea; however, it is usually systemic, and patients may exhibit other manifestations of hypocalcemia. Chorea typically resolves once blood calcium levels are normalized, but dopamine modulators may occasionally be required (91).
5.2 Hypomagnesemia
Hypomagnesemia may cause neurological symptoms similar to hypocalcemia, but chorea is uncommon and usually occurs in the context of other neurological signs (4, 92). The main causes of hypomagnesemia are inadequate oral intake, diarrhea, kidney disease, diuresis, acute pancreatitis, and hypercalcemia. Its treatment focuses on the correction of magnesium deficiency. On the one hand, the prevention and treatment of the original disease, in order to remove the cause of low magnesium. On the other hand, supplement magnesium, mostly magnesium sulfate preparations are used.
5.3 Hypernatremia or hyponatremia
Sodium excess-induced hypernatremia may cause neurological symptoms ranging from impaired consciousness to dystonia or chorea (91, 93). Although hypernatremia is a common electrolyte disorder in medical practice, hypernatremia-caused chorea is extremely rare; only isolated cases have been reported, and adults and children can develop the disease (93). The underlying mechanism may involve the dehydration of nerve cells due to osmotic imbalance or lysis of myelin sheaths outside the pons (94, 95). Treatment is often given with 5 percent glucose and water (93). With the correction of hypernatremia, chorea symptoms gradually decrease.
Chorea may also occur during the hyponatremic phase or after alleviating electrolyte disturbances. Chorea associated with hyponatremia has been reported in intracranial tuberculomas. Rapid alleviation of hyponatremia can cause the lysis of the central and extra-pontine myelin sheaths, which may also result in motor deficits (91, 96–99). In all the metabolic cases, the chorea resolved after the blood parameters normalized (93).
6 The possible common mechanisms
6.1 Autoimmune response
Autoimmune chorea is one of the major causes of adult chorea. It is associated with various antibodies, including thyroid peroxidase, thyroglobulin or thyroid microsomal thyroid autoantibodies, glutamic acid decarboxylase 65-kDa isoform antibodies, striatal antibodies, and voltage-gated calcium channel antibodies (41, 100). Autoimmune thyroiditis-associated steroid-responsive encephalopathy is associated with high titers of antithyroid antibodies. Glutamic acid decarboxylase 65-kDa isoform antibodies, usually at low titers, are also associated with other autoimmune disorders, such as type 1 diabetes, pernicious anemia, and autoimmune thyroiditis (101). Ghosh et al. (102) reported a case of diabetes mellitus with COVID-19 and chorea. They suggested that SARS-COV-2 infection could induce diabetic ketoacidosis and damage the striatum by infecting cell metabolism and inducing immune cell aggregation. These disorders are mediated by abnormal immune attacks that lead to neuronal dysfunction and manifest as chorea.
6.2 Hypersensitivity of the dopaminergic system
The dopamine system in the nigrostriatal pathway of the basal ganglia is closely related to chorea. Hypersensitivity of the dopaminergic system is one of the potential mechanisms of hyperthyroidism-associated chorea. Homo-vanillic acid, a dopamine metabolite, was significantly decreased in the cerebrospinal fluid of hyperthyroid patients (103). Moreover, treatment with dopamine antagonists can alleviate the symptoms of hyperthyroidism-related chorea (104). Hyperglycemia induces increased sensitivity of striatal dopamine receptors, and prolonged hyperglycemia leads to dysregulation of vascular autoregulation and interferes with basal ganglia dopamine metabolism, leading to chorea (78, 105).
6.3 Alteration of the blood-brain barrier
Multiple factors contribute to altered blood-brain barrier permeability, exacerbating basal ganglia injury. Calcium acts as a second messenger, and sustained dysregulation of cellular calcium homeostasis leads to the collapse of cellular function and structure (106). Altered calcium homeostasis usually precedes striatal dysfunction. In addition, calcium dysregulation can cause morphological and functional changes in neurons (107). And sodium, as an important electrolyte for regulating osmotic pressure in the brain, can cause a series of neurological symptoms, such as chorea, due to blood-brain barrier alteration, mainly in the case of rapid correction of hyponatremia. In hyponatremia, brain tissue is in a hypotonic state, and rapid supplementation of hypertonic saline can cause a rapid increase in plasma osmolality, resulting in brain tissue dehydration and blood-brain barrier disruption (93, 108). Hyperglycemia also exacerbates basal ganglia injury by increasing blood-brain barrier permeability (105).
7 Conclusion
When meeting with patients with chorea, clinicians should direct detailed laboratory tests, imaging, comprehensive neurological examination, and recording patients’ medical history, aiming to guide the comprehensive diagnosis of chorea etiology (shown in Table 1). Although endocrine disease-induced chorea is less common than other neurological disorders, recognizing the clinical features of these conditions can reduce misdiagnosis and aid in early diagnosis and treatment of disease. What are the reasons for the differences in the manifestations of chorea caused by different endocrine diseases? Whether there are specific biomarkers and imaging features for endocrine disease-related chorea? These unresolved issues need further research.
Table 1 What to measure when clinicians first meeting patients with chorea.
Author contributions
JZ wrote the original draft. XW reviewed, edited and supervised the entire paper. All authors have read and agreed to the published version of the manuscript. All authors contributed to the article and approved the submitted version.
Funding
This work was supported by the National Natural Science Foundation of China (81970714), Science and technology innovation leading talent project of Zhejiang ten thousand people plan (2021R52022) and Zhejiang province health innovative talents project (2021-CXRC07-01).
Acknowledgments
The authors gratefully acknowledge the participation of all participants in this study. Moreover, the authors also express their gratitude for the support of the Department of Endocrinology of the Zhejiang Provincial People’s Hospital and the Key Laboratory of Endocrine Gland Diseases in Zhejiang Province. The authors would also like to thank Editage (www.editage.cn) for English language editing.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
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Keywords: chorea, movement disorder, basal ganglia, endocrine, unusual manifestation
Citation: Zheng J and Wu X (2023) Chorea: An unusual manifestation of endocrine diseases. Front. Endocrinol. 14:1155638. doi: 10.3389/fendo.2023.1155638
Received: 31 January 2023; Accepted: 20 February 2023;
Published: 03 March 2023.
Edited by:
Fernando Lizcano, Universidad de La Sabana, ColombiaReviewed by:
Takao Ando, Nagasaki University Hospital, JapanCopyright © 2023 Zheng and Wu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Xiaohong Wu, drxhwu@163.com