Increased risk of Parkinson’s disease in patients with schizophrenia

A new study conducted at the University of Turku, Finland, shows that patients with a schizophrenia spectrum disorder have an increased risk of Parkinson’s disease later in life. The increased risk may be due to alterations in the brain’s dopamine system caused by dopamine receptor antagonists or neurobiological effects of schizophrenia.

The record-based case-control study was carried out at the University of Turku in collaboration with the University of Eastern Finland. The study examined the occurrences of previously diagnosed psychotic disorders and schizophrenia in over 25,000 Finnish Parkinson’s disease (PD) patients treated in 1996-2019.

In the study, patients with Parkinson’s disease were noted to have previously diagnosed psychotic disorders and schizophrenia more often than the control patients of the same age not diagnosed with PD.

– Previous studies have recognised several risk factors for PD, including age, male sex, exposure to insecticides, and head injuries. However, the current understanding is that the development of PD is due to a joint effect of different environment, hereditary, and patient-specific factors. According to our results, a previously diagnosed psychotic disorder or schizophrenia may be one factor that increases the risk of PD later in life, says Doctoral Candidate Tomi Kuusimäki from the University of Turku who was the main author of the research article.

Study changes conception of the association between Parkinson’s disease and schizophrenia

PD is currently the most rapidly increasing neurological disorder in the world. It is a neurodegenerative disorder that is most common in patients over 60 years of age. The cardinal motor symptoms include shaking, stiffness and slowness of movement. In Finland, circa 15,000 patients are currently living with a PD diagnosis.

In Parkinson’s disease, the neurons located in the substantia nigra in the midbrain slowly degenerate, which leads to deficiency in a neurotransmitter called dopamine. As for schizophrenia, the dopamine level increases in some parts of the brain. In addition, the pharmacotherapies used in the primary treatment of PD and schizophrenia appear to have contrasting mechanisms of action. PD symptoms can be alleviated with dopamine receptor agonists, whereas schizophrenia is commonly treated with dopamine receptor antagonists.

– The occurrence of Parkinson’s disease and schizophrenia in the same person has been considered rare because these diseases are associated with opposite alterations in the brain’s dopamine system. Our study changes this prevailing conception, says Kuusimäki.

Advertisement:

SaleBestseller No. 1
Ending Parkinson's Disease: A Prescription for Action
  • Dorsey MD, Ray (Author)
  • English (Publication Language)
  • 352 Pages - 03/16/2021 (Publication Date) - PublicAffairs (Publisher)
SaleBestseller No. 2
Living with Parkinson's Disease: A Complete Guide for Patients and Caregivers
  • Okun, Michael (Author)
  • English (Publication Language)
  • 320 Pages - 04/03/2020 (Publication Date) - Robert Rose (Publisher)
Bestseller No. 3
Parkinson's Disease (A Johns Hopkins Press Health Book)
  • Amazon Kindle Edition
  • Weiner, William J. (Author)
  • English (Publication Language)
  • 339 Pages - 10/31/2013 (Publication Date) - JHUP (Publisher)
Bestseller No. 4
Parkinson's Disease: 300 Tips for Making Life Easier
  • Amazon Kindle Edition
  • Schwarz, Shelley (Author)
  • English (Publication Language)
  • 150 Pages - 06/06/2006 (Publication Date) - Demos Health (Publisher)
Bestseller No. 5
Parkinson's Disease For Dummies
  • Amazon Kindle Edition
  • Tagliati, Michele (Author)
  • English (Publication Language)
  • 389 Pages - 03/01/2011 (Publication Date) - For Dummies (Publisher)
Bestseller No. 6
Everything You Need to Know About Caregiving for Parkinson’s Disease
  • Amazon Kindle Edition
  • Marie, Lianna (Author)
  • English (Publication Language)
  • 189 Pages - 10/15/2020 (Publication Date) - Purdue University Press (Publisher)
Bestseller No. 7
Parkinson's Disease Guide for the Newly Diagnosed: Understanding the Disease, Managing Your Symptoms, and Navigating Treatment
  • Amazon Kindle Edition
  • LeWitt MD, Peter (Author)
  • English (Publication Language)
  • 74 Pages - 05/26/2020 (Publication Date) - Rockridge Press (Publisher)
Bestseller No. 8
The Complete Guide for People With Parkinson’s Disease and Their Loved Ones
  • Amazon Kindle Edition
  • Marie, Lianna (Author)
  • English (Publication Language)
  • 220 Pages - 10/15/2020 (Publication Date) - Purdue University Press (Publisher)
Bestseller No. 9
Rethinking Parkinson's Disease: The definitive guide to the known causes of Parkinson's disease and proven reversal strategies
  • Amazon Kindle Edition
  • Coleman, John C (Author)
  • English (Publication Language)
  • 452 Pages - 10/08/2020 (Publication Date) - Hybrid Publishers (Publisher)
Bestseller No. 10
New Hope for Parkinson's Disease
  • Amazon Prime Video (Video on Demand)
  • (c) Information Television Network (Director)
  • (Playback Language)
  • Audience Rating: NR (Not Rated)

I get commissions for purchases made through links on this website. As an Amazon Associate I earn from qualifying purchases.