Cited by 226Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsNeuroscience and Neuropharmacology Research

A novel p38α MAPK inhibitor suppresses brain proinflammatory cytokine up-regulation and attenuates synaptic dysfunction and behavioral deficits in an Alzheimer's disease mouse model

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Munoz, Lenka, Ranaivo, Hantamalala Ralay, Roy, Saktimayee M, Hu, Wenhui, Craft, Jeffrey M, McNamara, Laurie K, Chico, Laura Wing, Van Eldik, Linda J +1 more·2007·Journal of Neuroinflammation

Abstract

BACKGROUND: An accumulating body of evidence is consistent with the hypothesis that excessive or prolonged increases in proinflammatory cytokine production by activated glia is a contributor to the progression of pathophysiology that is causally linked to synaptic dysfunction and hippocampal behavior deficits in neurodegenerative diseases such as Alzheimer's disease (AD). This raises the opportunity for the development of new classes of potentially disease-modifying therapeutics. A logical candidate CNS target is p38 alpha MAPK, a well-established drug discovery molecular target for altering proinflammatory cytokine cascades in peripheral tissue disorders. Activated p38 MAPK is seen in human AD brain tissue and in AD-relevant animal models, and cell culture studies strongly implicate p38 MAPK in the increased production of proinflammatory cytokines by glia activated with human amyloid-beta (A beta) and other disease-relevant stressors. However, the vast majority of small molecule drugs do not have sufficient penetrance of the blood-brain barrier to allow their use as in vivo research tools or as therapeutics for neurodegenerative disorders. The goal of this study was to test the hypothesis that brain p38 alpha MAPK is a potential in vivo target for orally bioavailable, small molecules capable of suppressing excessive cytokine production by activated glia back towards homeostasis, allowing an improvement in neurologic outcomes. METHODS: A novel synthetic small molecule based on a molecular scaffold used previously was designed, synthesized, and subjected to analyses to demonstrate its potential in vivo bioavailability, metabolic stability, safety and brain uptake. Testing for in vivo efficacy used an AD-relevant mouse model. RESULTS: A novel, CNS-penetrant, non-toxic, orally bioavailable, small molecule inhibitor of p38 alpha MAPK (MW01-2-069A-SRM) was developed. Oral administration of the compound at a low dose (2.5 mg/kg) resulted in attenuation of excessive proinflammatory cytokine production in the hippocampus back towards normal in the animal model. Animals with attenuated cytokine production had reductions in synaptic dysfunction and hippocampus-dependent behavioral deficits. CONCLUSION: The p38 alpha MAPK pathway is quantitatively important in the A beta-induced production of proinflammatory cytokines in hippocampus, and brain p38 alpha MAPK is a viable molecular target for future development of potential disease-modifying therapeutics in AD and related neurodegenerative disorders.

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Crossref · 10.1186/1742-2094-4-21

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  • p38α MAPK has been shown to mediate Aβ-induced expression of various proinflammatory cytokines/chemokines from microglial cells that causes neuroinflammation.

    “First, p38α MAPK has been shown to mediate Aβ-induced expression of various proinflammatory cytokines/chemokines from microglial cells that causes neuroinflammation [25, 26, 29, 35].”

    From Selective suppression of the α isoform of p38 MAPK rescues late-stage tau pathology (2016) · cites this paper as [35]

    The Background reports that Aβ activates p38 MAPK in glial cultures, followed by increased proinflammatory cytokines that p38 inhibitors block. The Results and Discussion report that a p38α inhibitor reduced Aβ-induced hippocampal cytokines in mice. The paper does not establish that those mouse cytokines came specifically from microglia, and the cited passages do not support the claim about chemokines. (LLM, conf=0.86)

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  • Targeted inactivation of p38α MAPK with small molecule inhibitors prevents the production of proinflammatory cytokines, reduces neurodegeneration, and improves neuronal and cognitive functions in rodent models of amyloid pathology.

    “Targeted inactivation of p38α MAPK with small molecule inhibitors prevents the production of proinflammatory cytokines, reduces neurodegeneration, and improves neuronal and cognitive functions in rodent models of amyloid pathology [25, 26, 29, 35].”

    From Selective suppression of the α isoform of p38 MAPK rescues late-stage tau pathology (2016) · cites this paper as [35]

    In Results and Discussion, ‘In vivo efficacy in AD animal model’ (page not provided), the paper reports that a p38α MAPK inhibitor reduced Aβ-induced hippocampal cytokine increases, attenuated synaptophysin loss, and improved Y-maze performance in a mouse model. It reports reduction toward baseline, not prevention of cytokine production, and does not show reduced neurodegeneration or test multiple rodent models. (LLM, conf=0.87)

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Research works printed but not linked: 1

  1. Guo Y Shen H Yan Z, Caldwell GW Solubility and Lipophilicity: Assessing physicochemical properties of lead compounds Methods in Pharmacology and Toxicology Optimization in Drug Discovery: In Vitro Methods 2004 Totowa, New Jersey: Humana Press 1 17

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Authors
Munoz, L., Ranaivo, H. R., Roy, S. M., Hu, W., Craft, J. M., McNamara, L. K., Chico, L. W., Van Eldik, L. J., & Watterson, D. M.
Affiliations
Northwestern University (US)
Corresponding author
Watterson, D Martin
Venue
Journal of Neuroinflammation
Published
2007-09-04
Volume
4
Issue
1
Pages
21-21
ISSN
1742-2094 (ISSN-L)
OpenAlex
W2029663297
Cited by
224
References
83
Citations by year
2026: 4 · 2025: 4 · 2024: 11 · 2023: 10 · 2022: 9 · 2021: 12 · 2020: 11 · 2019: 13 · 2018: 9 · 2017: 20 · 2016: 15 · 2015: 13 · 2014: 10 · 2013: 14 · 2012: 21
FWCI
6.26
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of Neuroinflammation (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Northwestern University
  • National Institutes of Health
  • National Institute on Aging (R01AG031311)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
Alzheimer's disease, inflammatory cytokines, glial activation, synaptic dysfunction, amyloid-beta, small molecule inhibitors, blood-brain barrier penetration, orally bioavailable drugs, disease-modifying therapy, neuroinflammation
MeSH terms
Alzheimer Disease, Animals, Behavior, Animal, Brain, Disease Models, Animal, Humans, Mice, Inbred C57BL, Pyridazines, Pyrimidines, Synapses, Drugs, Investigational, Up-Regulation, Cytokines, Inflammation Mediators, MAP Kinase Signaling System, Protein Kinase Inhibitors, Mitogen-Activated Protein Kinase 14, Mice

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