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Amyloid peptide toxicity and microtubule-stabilizing drugs
Mary L Michaelis1, Yingxue Chen, Sarah Hill
1Department of Pharmacology and Toxicology, University of Kansas, Lawrence 66045, USA. mlm@ukans.edu
Abstract:
Based on microtubule (MT) disruption observed in primary neurons exposed to fibrillar amyloid peptides (A beta), we tested the potential protective effect of MT-stabilizing drugs such as Taxol against A beta-induced disruption of the cytoskeleton. Although Taxol was strongly protective, the fact that it does not cross the blood brain barrier (BBB) led us to synthesize and test other agents with MT-stabilizing properties and possible penetration into the brain. Our studies have thus far demonstrated that several MT-stabilizing agents, including some with structures quite different from that of Taxol, showed significant protective effects. However, not all agents that promoted MT-assembly were protective, suggesting additional mechanisms are involved in the actions of the drugs. A small number of neuroprotective compounds appear to have potential to enter the brain and thus might be tested to see if they slow progression of neurodegeneration in an appropriate animal model of Alzheimer's disease.
Insights
Microtubule-stabilizing drugs show promise in protecting neurons from amyloid-beta damage. Researchers are developing new agents that can cross the blood-brain barrier to treat neurodegenerative diseases like Alzheimer's.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Fibrillar amyloid peptides (A beta) disrupt microtubules (MTs) in neurons.
- This disruption is a key factor in neurodegeneration, particularly in Alzheimer's disease.
Purpose of the Study:
- To evaluate the neuroprotective effects of MT-stabilizing drugs against A beta-induced toxicity.
- To identify novel MT-stabilizing agents capable of crossing the blood-brain barrier (BBB).
Main Methods:
- Primary neurons were exposed to fibrillar A beta.
- The protective effects of Taxol and newly synthesized MT-stabilizing agents were assessed.
- Agents' ability to promote MT assembly and cross the BBB was evaluated.
Main Results:
- Taxol demonstrated significant protection against A beta-induced MT disruption.
- Several novel MT-stabilizing agents, structurally distinct from Taxol, also showed protective effects.
- Not all MT-assembly promoting agents were protective, indicating complex mechanisms.
Conclusions:
- MT-stabilizing drugs offer a potential therapeutic strategy against A beta toxicity.
- Further development of BBB-penetrant neuroprotective compounds is warranted.
- Compounds showing potential for brain penetration may help slow Alzheimer's progression in animal models.