A review on the mptp neurotoxin induced parkinson’s disease
Journal name: World Journal of Pharmaceutical Research
Original article title: A review on the mptp neurotoxin induced parkinson’s disease
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Rishabh Singh and Anant Srivastava
World Journal of Pharmaceutical Research:
(An ISO 9001:2015 Certified International Journal)
Full text available for: A review on the mptp neurotoxin induced parkinson’s disease
Source type: An International Peer Reviewed Journal for Pharmaceutical and Medical and Scientific Research
Doi: 10.20959/wjpr201817-13377
Copyright (license): WJPR: All rights reserved
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Summary of article contents:
1) Introduction
MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) was discovered in the 1970s and subsequently recognized as a neurotoxin that induces Parkinson's Disease (PD) symptoms. The neurotoxin's ability to target dopaminergic neurons within the nigrostriatal pathway makes it a valuable model for studying idiopathic PD. MPTP is lipophilic, allowing it to easily cross the blood-brain barrier and be converted by astrocytes into its toxic metabolite, MPP+ (1-methyl-4-phenylpyridinium), which selectively affects dopaminergic neurons. This model has been pivotal in exploring the mechanisms of dopaminergic neuron death and the development of anti-Parkinsonian drugs.
2) Neurotoxicity of MPP+
Upon entry into dopaminergic neurons, MPP+ inhibits mitochondrial complex I, a crucial component of the respiratory chain involved in ATP synthesis. MPP+ binding to NADH dehydrogenase drastically reduces the neuronal ATP levels, leading to cellular energy failure. The inhibition of mitochondrial respiration results in increased oxidative stress through the production of toxic free radicals. This cascade of pathological events culminates in reduced ATP supply, mitochondrial dysfunction, and eventually neuronal degeneration, highlighting the importance of mitochondrial health in neuronal survival.
3) Role of Oxidative Stress and Apoptosis
Oxidative stress plays a critical role in MPTP-induced neuronal injury, with substantial oxidative damage evidenced by increased levels of oxidized lipids and proteins within affected neurons. The presence of MPP+ induces the formation of reactive oxygen species (ROS) due to its interference with mitochondrial function. This study indicates that MPP+ promotes cellular apoptosis through the mitochondrial apoptotic cascade. The release of cytochrome c from mitochondria triggers caspase activation, leading to programmed cell death, further emphasizing the significance of mitochondrial integrity and antioxidant defenses in the context of dopaminergic neuron degeneration.
4) Inflammatory Response in Neurodegeneration
MPTP administration activates microglia, the brain's immune cells, initiating an inflammatory response that exacerbates neuronal damage. Activated microglia release pro-inflammatory cytokines and ROS, which can be detrimental to nearby neurons. Notably, the expression of inducible nitric oxide synthase (iNOS) is elevated following MPTP treatment, resulting in increased production of nitric oxide (NO), a toxic radical. The interplay between inflammation and oxidative stress represents a significant factor in the progression of Parkinson's Disease, highlighting potential therapeutic targets in neuroinflammatory pathways.
5) Conclusion
The MPTP model serves as an essential tool for understanding the pathophysiology of Parkinson's Disease. By elucidating the roles of mitochondrial dysfunction, oxidative stress, and neuroinflammation in dopaminergic neuron death, this model aids in the development of new therapeutic strategies. The comprehensive insights gained from MPTP research further our understanding of idiopathic PD and pave the way for novel interventions aimed at protecting neuronal health and function in this debilitating disorder.
FAQ section (important questions/answers):
What was MPTP initially discovered for in 1976?
MPTP was discovered accidentally by a chemistry student attempting to synthesize synthetic heroin, leading to severe Parkinson’s disease-like symptoms in those who used it.
How does MPTP affect dopaminergic neurons in the brain?
MPTP crosses the blood-brain barrier and is converted by astrocytes to MPP+, which selectively targets and damages dopaminergic neurons in the nigrostriatal pathway, mimicking Parkinson's disease symptoms.
What role does oxidative stress play in MPTP-induced neurotoxicity?
MPP+ generates reactive oxygen species, leading to oxidative stress, mitochondrial dysfunction, and subsequent ATP depletion, contributing to neuronal death in Parkinson's disease.
How does the MPTP model help in Parkinson's disease research?
The MPTP model closely resembles the clinical features of idiopathic Parkinson's disease, allowing researchers to study disease mechanisms and potential therapeutics effectively.
What mechanisms are investigated in MPTP-treated animal models?
Researchers investigate mitochondrial dysfunction, ATP depletion, oxidative stress, apoptosis, and glutamate excitotoxicity to better understand dopaminergic cell death and neurodegeneration.
What inflammatory responses are triggered by MPTP administration?
MPTP promotes microglial activation, leading to increased pro-inflammatory cytokine expression and possibly contributing to dopaminergic neuron death and neuroinflammation in Parkinson's disease.
Glossary definitions and references:
Scientific and Ayurvedic Glossary list for “A review on the mptp neurotoxin induced parkinson’s disease”. This list explains important keywords that occur in this article and links it to the glossary for a better understanding of that concept in the context of Ayurveda and other topics.
1) Disease:
Disease refers to a pathological condition affecting the body or mind, characterized by specific symptoms and signs. In this context, Parkinson's disease (PD) is a neurodegenerative disorder with motor dysfunctions. The MPTP model helps illustrate the underlying mechanisms and potential treatments for such diseases.
2) Death:
Death signifies the cessation of life processes, and in the context of neurodegenerative diseases like Parkinson’s, it often refers to the degeneration and eventual demise of neurons, particularly dopaminergic neurons. Understanding the mechanisms leading to cellular death can aid in developing neuroprotective strategies.
3) Toxicity:
Toxicity describes the degree to which a substance can harm organisms. The relevance of neurotoxin MPTP is highlighted by its ability to induce symptoms reminiscent of Parkinson’s disease through the selective toxicity towards dopaminergic neurons, emphasizing the importance of studying neurotoxic agents.
4) Inflammation:
Inflammation is a biological response to harmful stimuli, typically involving immune activation. In the MPTP model, inflammation plays a critical role in neuronal damage and death due to the release of pro-inflammatory cytokines and recruitment of immune cells, underscoring the need to understand its contribution to neurodegeneration.
5) Study (Studying):
Studying involves observation and analysis in a specific area of interest. Engaging in focused studies on MPTP-induced neuronal toxicity not only enhances comprehension of Parkinson's but also informs therapeutic development, guiding researchers towards potential solutions to mitigate neurodegenerative processes.
6) Activity:
Activity can refer to both biological processes and experimental procedures in research. In Parkinson’s disease studies, monitoring motor activity and behavioral changes in animal models treated with neurotoxins provides insight into the functional consequences of neuronal damage and the efficacy of therapeutic interventions.
7) Species:
Species denotes a group of organisms that can interbreed. The use of different species, especially in animal models like mice, is crucial for studying diseases such as Parkinson's, as it permits researchers to mimic human pathology and examine biological responses to treatments.
8) Animal:
The term 'animal' is relevant as it embodies the models used in scientific research, particularly in studies involving MPTP to understand Parkinson's disease. Animal models offer insights into neuronal pathophysiology and help evaluate the effectiveness and safety of new pharmaceuticals before human trials.
9) Life:
Life signifies the condition that distinguishes active organisms from inorganic matter, encompassing various processes, including growth and reproduction. In the context of neurodegenerative diseases, understanding life at the cellular level, particularly how neurons maintain vitality in the face of toxins, is fundamental to developing interventions.
10) Accumulation (Accumulating, Accumulate):
Accumulate refers to the gradual gathering of substances over time. In neurobiology, the accumulation of neurotoxins or proteins can indicate pathological changes within neuronal cells. Understanding how and why this accumulation occurs is pivotal in elucidating the mechanisms behind neurodegenerative diseases.
11) Education:
Education underscores the importance of knowledge dissemination and learning. In the context of Parkinson's research, continued education enables scientists, medical professionals, and the public to understand the disease, its causes, and potential therapies, fostering informed discussions and advancements in treatment strategies.
12) Lucknow:
Lucknow, a city in India, is mentioned as the location of the Hygia Institute of Pharmaceutical Education and Research, where the research is conducted. The regional context emphasizes where significant advancements in the study of Parkinson's disease and neurotoxin models are occurring.
13) Science (Scientific):
Science represents the systematic pursuit of knowledge about the natural world. In the context of Parkinson's research, it embodies the rigorous methodologies applied to investigate mechanisms of neurotoxicity and develop effective treatments, illustrating the mutual interplay between scientific inquiry and medical advancement.
14) Nature:
Nature encompasses the inherent qualities and characteristics of organisms and environments. In the context of Parkinson's disease studies, it refers to the biological processes impacting neuron health and highlights the importance of understanding natural mechanisms of neurodegeneration for therapeutic interventions.
15) Blood:
Blood refers to the bodily fluid that circulates to deliver nutrients and oxygen. In neurotoxin studies, elucidating how compounds like MPTP traverse the blood-brain barrier to affect dopaminergic neurons can help understand mechanisms of neurodegenerative diseases and potentially guide treatment strategies.
16) Vila:
Vila may refer to a researcher or the context of scientific literature. Scientists, including Vila, contribute valuable insights into the pathogenesis of neurodegenerative diseases through their studies on MPTP and its effects on neural structures, guiding future therapeutic developments.
17) Drug:
Drug refers to substances used to diagnose, treat, or prevent diseases. In the context of Parkinson's research using MPTP models, investigating neuroprotective drugs becomes crucial for developing effective treatments to counteract the effects of the neurotoxin and protect dopaminergic neurons.
18) Ter:
Ther likely refers to therapeutic avenues being explored in understanding and treating neurodegenerative diseases like Parkinson's disease. Identifying and developing therapies that target neurotoxic mechanisms has significant implications for improving patient outcomes and quality of life.
19) Chan:
Chan may refer to a researcher or scientist who has contributed to the field of neurodegeneration research. Referencing researchers like Chan highlights the collaborative nature of scientific inquiry in addressing complex health issues such as Parkinson's disease.
20) Surrounding:
Surrounding refers to the external environments or factors that affect the internal mechanisms of neurological diseases. Studying the surrounding context of brain regions involved in Parkinson's provides insights into the interconnectedness of neuronal networks and their vulnerability to neurotoxins.
21) Developing:
Developing relates to the process of creating or improving something, especially in drug development and therapeutic strategies. Research on MPTP models involves developing new treatments targeted at neuroprotective methods to slow the progression of Parkinson's disease and enhance patient care.
22) Srivastava (Sri-vastava, Shrivastava, Shri-vastava):
Srivastava likely refers to a contributing researcher or co-author who has played a significant role in the studies on MPTP and Parkinson's disease. Including authors’ names emphasizes the collaborative effort in scientific research and the multidisciplinary nature of tackling health-related issues.
23) Pesticide:
Pesticide denotes chemicals used to eliminate pests and can serve as neurotoxins. The connection between pesticide exposure and increased risk of Parkinson's highlights the need to study environmental triggers influencing the disease’s pathophysiology and neurotoxic mechanisms.
24) Mutation:
Mutation refers to a change in the DNA sequence that can lead to alterations in protein function. In the context of diseases like Parkinson’s, mutations in genes related to dopamine metabolism or mitochondrial function can contribute to neurodegenerative processes, affecting neuronal health.
25) Elephant:
The term 'elephant' might metaphorically refer to significant or overlooked factors in Parkinson's disease research. It emphasizes the importance of addressing all pertinent aspects of the disease, including both visible symptoms and underlying, often overlooked biological mechanisms.
26) Channel:
Channel refers to pathways through which substances move, particularly biological membranes. Understanding ion channels' role in neuronal function is critical to comprehending how disruptions in cellular signaling can contribute to neurodegenerative diseases like Parkinson’s.
27) Santa (Shanta, Samta, Shamta):
Santa may refer to a specific researcher or context within scientific literature. Fostering research collaboration, Santa's involvement could highlight contributions within the field of neurodegeneration and the significance of collective efforts to advance understanding and treatment strategies.
28) Field:
Field represents a specific area of study or professional domain. Parkinson's research embodies a multidisciplinary field, integrating insights from neuroscience, pharmacology, and toxicology to enhance our comprehension of disease mechanisms and foster the development of effective interventions.
29) Kuni:
Kuni may refer to a researcher or specific author contributing to the discourse around Parkinson's disease studies. Highlighting individual contributions in research emphasizes the collaborative and interconnected nature of scientific investigations aimed at tackling complex health issues.
30) Tank:
Tank may refer to a metaphorical space for research, particularly in the study of environmental neurotoxins like MPTP. Understanding how external factors affect neural processes provides critical insight into neurodegenerative disease mechanisms and therapeutic avenues for intervention.
31) Sign:
Sign refers to indicators or manifestations of a condition. In Parkinson's disease, various signs, such as motor dysfunction and cellular changes, can elucidate the extent and nature of neurodegeneration, guiding research priorities and therapeutic focus.
32) Fish:
Fish may symbolize environmental toxins, such as those found in aquatic ecosystems, impacting dopamine neurons. Analyzing the effects of such toxins, like rotenone, can provide comprehensive insights into environmental factors contributing to neurodegenerative disorders like Parkinson's disease.
33) Rich (Rch):
Rich refers to abundance or a wealth of resources. In the context of research, having a rich dataset from studies like those involving MPTP can provide valuable insights into the mechanisms underlying Parkinson's disease, thus fostering innovation in therapeutic strategies.
34) Pole:
Pole could refer to a behavioral test used in animal studies to evaluate motor functions affected in Parkinson’s disease models. Understanding how treatments ameliorate symptoms observable in pole test assays reveals the efficacy of potential neuroprotective drugs.
Other Science Concepts:
Discover the significance of concepts within the article: ‘A review on the mptp neurotoxin induced parkinson’s disease’. Further sources in the context of Science might help you critically compare this page with similair documents:
Oxidative stress, Reactive oxygen species, Neuroprotective agent, Parkinson's disease, Mitochondrial dysfunction, Pro-inflammatory cytokine, Excitotoxicity, Apoptotic cascade, Anti-apoptotic protein.