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Phenothiazines: potential management of Creutzfeldt-Jacob disease and its variants
1Unit of Mycobacteriology, Institute of Hygiene and Tropical Medicine, Universidade Nova de Lisboa, Rua Junqueira 96, 1349-008, Lisbon, Portugal. lamaral@ihmt.unl.pt
Insights
New variant Creutzfeldt-Jakob disease (nvCJD) is a fatal neurodegenerative condition. Phenothiazine derivatives show promise in inhibiting prion production and treating nvCJD by destroying intracellular prions.
Area of Science:
- Neuroscience
- Infectious Diseases
- Pharmacology
Background:
- New variant Creutzfeldt-Jakob disease (nvCJD) is an incurable prion disease with significant mortality.
- Current diagnosis is confirmed only post-mortem, posing challenges for timely intervention.
Purpose of the Study:
- To review evidence supporting a model for phenothiazine derivatives' mechanism in destroying prions.
- To explore the potential of phenothiazines in treating nvCJD.
Main Methods:
- Review of existing literature on nvCJD and phenothiazine derivatives.
- Analysis of cellular models demonstrating prion inhibition by phenothiazines.
- Case study of nvCJD remission using phenothiazines and an antimalarial.
Main Results:
- Phenothiazine derivatives inhibit prion production in neuroblastoma cell cultures.
- A combination therapy including phenothiazines induced remission in an advanced nvCJD case.
- Evidence suggests intracellular antimicrobial activity of phenothiazines contributes to prion destruction.
Conclusions:
- Phenothiazine derivatives represent a potential therapeutic strategy for nvCJD.
- Further research into the mechanism of action and clinical efficacy is warranted.
- Combination therapies may offer improved outcomes for prion diseases.
Abstract:
Creutzfeldt-Jakob disease acquired from bovines (nvCJD) has been responsible for nearly 100 deaths in the UK and thousands more may die in the years to come. New variant CJD (nvCJD) is incurable and although clinical diagnosis is becoming more precise, the diagnosis is only certain at autopsy. Phenothiazine derivatives inhibit production of prions, the disease causing agent, in cultured neuroblastoma cells, and an advanced case of nvCJD was recently brought to remission by the use of these agents in combination with an antimalarial. In this review we present direct and circumstantial evidence in support of a model describing the manner by which the intracellular antimicrobial activity of phenothiazines might cause the destruction of intracellular prions.