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Interferon research abs 1 || Hemoglobin research abs || Stem cell research abs || Nucleic acid research abs || Herpes research abs || Bronchitis research abs || Schizophrenia research abs || Tuberculosis research abs || Pneumonia research abs || Constipation research abs || Laxative research abs || hair research abs || hair related research references || testosterone related research references || melanin related research references || nicotine related research references

Brain Res. 2003 Aug 15;981(1-2):85-98.
In vitro pharmacological characterization of (+/-)-4-[2-(1-methyl-2-pyrrolidinyl)ethyl]thio]phenol hydrochloride (SIB-1553A), a nicotinic acetylcholine receptor ligand.

Rao TS, Adams PB, Correa LD, Santori EM, Sacaan AI, Reid RT, Suto CM, Vernier JM.

Merck Research Laboratories, 3535 General Atomics Court, San Diego, CA 92121, USA. tadimeti_raerck.com

SIB-1553A ((+/-)-4-[2-(1-methyl-2-pyrrolidinyl)ethyl]thio]phenol HCl) is a neuronal nicotinic acetylcholine receptor (nAChR) ligand which displaced the binding of [3H]nicotine (NIC) to the rat brain nAChRs with an IC(50) value of 110 nM with no appreciable affinity to the alpha7 nAhRs. SIB-1553A showed modest affinity for histaminergic (H3) and serotonergic (5-HT1 and 5-HT2) receptors, and sigma binding sites. In calcium flux assays, SIB-1553A (0.1-5 microM), in contrast to nicotine, showed a greater selectivity for beta4-subunit containing recombinant hnAChRs (alpha2beta4, alpha3beta4 and alpha4beta4) vs. beta2-subunit containing nAChRs (alpha4beta2 and alpha3beta2) both in terms of efficacy and potency. While NIC (10-30 microM) and epibatidine (0.01-0.1 microM) fully activated human muscle-type AChRs expressed by RD cell line, SIB-1553A was virtually ineffective for up to >100 microM and elicited less than 10% of the response due to suberyldicholine. SIB-1553A (< or =30 microM) evoked [3H]DA release from striatum, olfactory tubercles and prefrontal cortex (PFC), and [3H]NE release from hippocampus and PFC, and this evoked release was sensitive to mecamylamine (MEC). SIB-1553A-evoked neurotransmitter release exhibited region- and transmitter-specific antagonism by dehydro-beta-erythroidine (DHbetaE). SIB-1553A was less efficacious than NIC at evoking [3H]NE from the rat hippocampus and antagonized NIC response upon co-application implying partial agonist properties. SIB-1553A did not evoke basal [3H]ACh release from the rat striatum or hippocampus, but attenuated NMDA-evoked [3H]ACh release from the rat striatum. SIB-1553A did not inhibit rat brain cholinesterase for up to 1 mM. Multiple receptor affinities and release of several neurotransmitters may underlie the cognitive-enhancing effects of SIB-1553A documented in rodent and primate models.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12885429&dopt=Abstract [PubMed - in process]

Brain Res. 2003 Aug 15;981(1-2):118-25.
Long-lasting CNS effects of a short-term chemical knockout of ornithine decarboxylase during development: nicotinic cholinergic receptor upregulation and subtle macromolecular changes in adulthood.

Slotkin TA, Freibaum BD, Tate CA, Thillai I, Ferguson SA, Cada AM, Seidler FJ.

Department of Pharmacology & Cancer Biology, Box 3813 DUMC, Duke University Medical Center, Durham, NC 27710, USA. t.slotkiuke.edu

Ornithine decarboxylase (ODC) and the polyamines play an essential role in brain cell replication and differentiation and polyamines also regulate the function of nicotinic acetylcholine receptors (nAChRs). We administered alpha-difluoromethylornithine (DFMO), an irreversible inhibitor of ODC, to neonatal rats on postnatal days 5-12, during the mitotic peak of the cerebellum, a treatment regimen that achieves a chemical knockout of ODC activity and polyamine depletion limited to the treatment period. Although growth inhibition and gross dysmorphology were limited to the cerebellum, both alpha7 and alpha4beta2 nAChRs were upregulated in adulthood in the frontal cortex, hippocampus and thalamus, with the largest effect in the latter region, primarily in females. Receptor upregulation was accompanied by abnormalities in macromolecular indices of cell packing density and cell membrane surface area, but the generalized cellular alterations did not share the regional or sex selectivity shown by the effects on nAChRs. Elevated DNA concentration was most notable in the hippocampus and was associated with augmented levels of glial fibrillary acidic protein, thus implying gliosis as the cause of the increased number of cells. DFMO's effects on both nAChR expression and cellular biomarkers resembled those of developmental exposure to nicotine. Accordingly, some of the effects may represent a specific alteration in nAChR signaling evoked by polyamine depletion during a critical developmental window. Alterations in polyamine gating of cholinergic synaptic signaling may thus contribute to the adverse neurobehavioral effects of numerous neuroteratogens that directly or indirectly disrupt the ODC/polyamine pathway.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12885432&dopt=Abstract [PubMed - in process]

J Exp Bot. 2003 Sep;54(390):2065-70. Epub 2003 Jul 28.
Alkaloids in plants and root cultures of Atropa belladonna overexpressing putrescine N-methyltransferase.

Rothe G, Hachiya A, Yamada Y, Hashimoto T, Drager B.

Institute of Pharmaceutical Biology, Martin-Luther-University Halle-Wittenberg, Hoher Weg 8, D-06120 Halle/Saale, Germany.

Putrescine N-methyltransferase (PMT) is the first alkaloid-specific enzyme for nicotine and tropane alkaloid formation. The pmt gene from Nicotiana tabacum was fused to the CaMV 35S promoter and integrated into the Atropa belladonna genome. Transgenic plants and derived root cultures were analysed for gene expression and for levels of alkaloids and their precursors. Scopolamine, hyoscyamine, tropine, pseudotropine, tropinone, and calystegines were found unaltered or somewhat decreased in pmt-overexpressing lines compared to controls. When root cultures were treated with 5% sucrose, calystegine levels were elevated in control roots, but were not affected in pmt-overexpressing roots. 1 micro M auxin reduced calystegine levels in control roots, while in pmt-overexpressing roots all alkaloids remained unaltered. Expression level of pmt alone is apparently not limiting for tropane alkaloid formation in A. belladonna.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12885861&dopt=Abstract [PubMed - in process]

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