Autoimmune and Paraneoplastic Movement Disorders pubmed.ncbi.nlm.nih.gov/294...
Movement disorders are common in patients with autoimmune disorders - affecting the central (brain) and peripheral (body) nervous system. They may be seen in autoimmune disorders triggered by an infectious or toxic agent, as in basal ganglia encephalitis with antibodies against the dopamine-D2 receptors.
Is Parkinson's disease really a deficiency of dopamine or is it an inability to utilize the dopamine hormone? Similar to hypothyroidism or T2 diabetes? We have the hormone but can't metabolize it, so doctors flood our endocrine system with a synthetic hormone to ease symptoms and never treat the underlying cause of hormone resistance.
[For example: when I treated my central (brain) hypothyroidism with natural desiccated thyroid hormone my thyroid gland atrophied because I have hormone resistance not related to thyroiditis from Hashimoto's antibodies, it is caused by injury to the hypothalamic/pituitary/adrenal (HPA) axis. The root cause of my central hypothyroidism is environmental exposure to chemical toxins. The same is true for my central Diabetes Insipidus, I have excess insulin in my blood that my body can't use because the vasopressin/antidiuretic hormone (ADH) receptors are blocked by antibodies. Again, this can been traced upstream to HPA axis injury.]
Chorea or dystonia are usually the most prominent movement disorders in patients with dopamine-D2 receptor antibodies. Movement disorders are also observed in patients with diffuse or limbic encephalitis (brain inflammation) with antibodies directed against neuronal cell-surface antigens. Anti-NMDA receptor encephalitis is on of the most common and may present with a variety of movement disorders, including: chorea, dystonia, myorhythmia and stereotypies. Chorea is also seen in rheumatic disorders such as SLE (Lupus) or antiphospholipid syndrome.
Other motor abnormalities such as faciobrachial dystonic seizure and neuromyotonia (paraneoplastic Isaacs's syndrome which looks a helluv a lot like ALS) are see in LGI1 and Caspr-2 antibodies and Voltage Gated Potassium Channel antibodies (VGKC channelopathy), this is important because they may be a harbinger for the onset of overt limbic encephalitis.
Autoimmunity against the enzyme glutamic acid decarboxylase (GAD) usually presents with movement disorders, most commonly stiff-person syndrome (can also paraneoplastic) or cerebellar ataxia.
Disorders with uncertain autoimmune mechanisms such as Hashimoto's encephalitis and idiopathic opsoclonus-myoclonus syndrome (neuroblastoma) commonly present with tremor, myoclonus and ataxia.
Autoimmune dysautonomia, also know as autoimmune autonomic ganglionopathy (AAG) is a condition in which the body's immune system mistakenly attacks and damages parts of the autonomic nervous system. Symptoms may include severe orthostatic hypertension, fainting, dilated pupils, urinary retention, and dry mouth and eyes. Treatment options include plasmapheresis, IV immunoglobulin, corticosteroids or immunosuppressive drugs.
Antibodies are common in patients with: epilepsy, encephalitis, cerebellar ataxia, SLE/Lupus, Sjogren's syndrome, schizophrenia, mania or stroke. These autoimmune anti-receptor antibodies can bind neurons in a few brain regions, activate glutamate receptors, decrease glutamate receptor expression, impair glutamate-induced signaling and function (glutamate excitotoxicity), activate blood brain barrier endothelial cells, kill neurons, damage the brain, induce behavioral/psychiatric/cognitive abnormalities and ataxia and can be removed or silenced in some patients by immunotherapy.
Tremors have been well described in association with monoclonal gammopathy (a disease that affects the production of gamma globulin and related immunoglobulins). Gammopathy is one of the well-known causes of tremors in the adult population. It can cause both resting and kinetic tremors in the upper extremities. It is supposed that peripheral neuropathy associated with gammopathy is the main underlying cause of tremors in these groups of patients. However, central (brain)causes are also suggested. In this case, we are led to conclude that our patient's tremor was centrally mediated since it responded well to dopamine replacement therapy. Further study is needed to elucidate the role of dopamine depletion in tremors associated with gammopathies. pubmed.ncbi.nlm.nih.gov/349...
Some people will respond well to levodopa-carbidopa treatment. In this case report, the man had a primary diagnosis of Parkinson's disease and started on l-c with significant improvement of his tremors. Blood work showed a significant increase in lambda light chain levels and the presence of an M spike in serum protein electrophoresis. He was found to have multiple myeloma and Waldenstrom's macroglobulinemia - a type of non-Hodgkin's lymphoma. The underlying malignancy was treated with chemotherapy and immunotherapy and the tremor did not recur in the one year follow-up.
The process of paraneoplastic neurological syndromes is presumed to result from an immune attack on the underlying cancer. The different types of cancer antibodies occur in different tumors and lead to different clinical symptoms. A PET/CT using [18F]FDG tracer can help detect tumors in patients with paraneoplastic disease where conventional imaging misses them.
There is an intimate link between Neurodegenerative disorders (Parkinson's/Dementia/ALS), autoimmune disorders and cancer. This isn't new information for neurologists, oncologists and immunologists or even general practitioners.
If movement disorders are common in patients with autoimmune disorders - then isn't the reverse also true? Why aren't people who've been diagnosed with NDD routinely screened for autoimmune/paraneoplastic disease? If you've been diagnosed with PD and an autoimmune disease or cancer - have you been treated with IVIG and plasmapheresis or steroids?
**This blew me away - 1% of people with a Huntington's disease phenotype (trait) do not have the Huntington gene mutation. WTF. Now we have Huntington's Disease-Like syndromes too? The environmental toxins and poisons are becoming more complex.
Treatable conditions should be treated. This is a battle I fight every. single. day. I'd love for people to weigh in and tell their story of cancer/autoimmune/neurological co-diagnosis so that we can shine a light on the complexity and intimacy of these related diagnoses.
Peace,
SE