Abstract
Tacrine is a medication applied in cases of mild to moderate dementia in Alzheimer’s disease. By blocking acetylcholinesterase activity the drug increases the concentration of acetylcholine, whose effects influence the functions of different organs and systems of the body. The effect of tacrine on smooth muscle preparations isolated from rat stomach was studied by isometric registration of muscle contractility. Our investigations found a specific significant systematic decrease in the strength of consecutive tacrine-induced contractions of smooth muscle preparations, a phenomenon known as tachyphylaxis. The tacrineinduced tachyphylaxis was significantly inhibited by SQ22536 (inhibitor of adenylate cyclase activity), by blockers of nitric oxide synthase and KT5823 (inhibitor of protein kinase G). The process was not influenced by cyclopiazonic acid (specific blocker of sarco/endoplasmic reticulum Ca2+-ATPase,) and atropine (blocker of M-cholinergic receptors). We hypothesize that the overlapping and different time-development of the two opposing processes: smooth muscle contraction caused by acetylcholinesterase inhibition and tacrine-induced relaxation influenced by synthesis of nitric oxide, results in tachyphylaxis.
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Abbreviations
- AC:
-
adenylate cyclase
- CNS:
-
central nervous system
- GC:
-
guanylyl cyclase
- GI:
-
gastrointestinal tract
- MLCPK:
-
myosin light chain protein kinase
- NOSs:
-
nitric oxide synthases
- PKG:
-
protein kinase
- SM:
-
smooth muscles
- SERCA:
-
sarcoplasmic Ca2+ pump
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Prissadova, N.A., Kristev, A.D., Getova, D.P. et al. Tacrine-induced tachyphylaxis in gastric smooth muscles. cent.eur.j.biol. 7, 1013–1020 (2012). https://doi.org/10.2478/s11535-012-0103-7
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DOI: https://doi.org/10.2478/s11535-012-0103-7