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Free choline and choline metabolites in rat brain and body fluids: sensitive determination and implications for choline supply to the brain.
Klein J, Gonzalez R, Köppen A, Löffelholz K. Klein J, et al. Among authors: koppen a. Neurochem Int. 1993 Mar;22(3):293-300. doi: 10.1016/0197-0186(93)90058-d. Neurochem Int. 1993. PMID: 8443570
Regulation of free choline in rat brain: dietary and pharmacological manipulations.
Klein J, Köppen A, Löffelholz K. Klein J, et al. Among authors: koppen a. Neurochem Int. 1998 May-Jun;32(5-6):479-85. doi: 10.1016/s0197-0186(97)00127-7. Neurochem Int. 1998. PMID: 9676747
Acetylcholine release and choline availability in rat hippocampus: effects of exogenous choline and nicotinamide.
Köppen A, Klein J, Erb C, Löffelholz K. Köppen A, et al. J Pharmacol Exp Ther. 1997 Sep;282(3):1139-45. J Pharmacol Exp Ther. 1997. PMID: 9316819
Effects of nicotinamide on central cholinergic transmission and on spatial learning in rats.
Köppen A, Klein J, Schmidt BH, van der Staay FJ, Löffelholz K. Köppen A, et al. Pharmacol Biochem Behav. 1996 Apr;53(4):783-90. doi: 10.1016/0091-3057(95)02118-3. Pharmacol Biochem Behav. 1996. PMID: 8801579
Synergistic effect of nicotinamide and choline administration on extracellular choline levels in the brain.
Köppen A, Klein J, Holler T, Löffelholz K. Köppen A, et al. J Pharmacol Exp Ther. 1993 Aug;266(2):720-5. J Pharmacol Exp Ther. 1993. PMID: 8355203
Choline, a precursor of acetylcholine and phospholipids in the brain.
Löffelholz K, Klein J, Köppen A. Löffelholz K, et al. Among authors: koppen a. Prog Brain Res. 1993;98:197-200. doi: 10.1016/s0079-6123(08)62399-7. Prog Brain Res. 1993. PMID: 8248509 Review. No abstract available.
Release of choline from rat brain under hypoxia: contribution from phospholipase A2 but not from phospholipase D.
Klein J, Holler T, Cappel E, Köppen A, Löffelholz K. Klein J, et al. Among authors: koppen a. Brain Res. 1993 Dec 10;630(1-2):337-40. doi: 10.1016/0006-8993(93)90674-c. Brain Res. 1993. PMID: 8118702
Small rises in plasma choline reverse the negative arteriovenous difference of brain choline.
Klein J, Köppen A, Löffelholz K. Klein J, et al. Among authors: koppen a. J Neurochem. 1990 Oct;55(4):1231-6. doi: 10.1111/j.1471-4159.1990.tb03129.x. J Neurochem. 1990. PMID: 2398357
Uptake and metabolism of choline by rat brain after acute choline administration.
Klein J, Köppen A, Löffelholz K, Schmitthenner J. Klein J, et al. Among authors: koppen a. J Neurochem. 1992 Mar;58(3):870-6. doi: 10.1111/j.1471-4159.1992.tb09337.x. J Neurochem. 1992. PMID: 1737995
Uptake and storage of choline by rat brain: influence of dietary choline supplementation.
Klein J, Köppen A, Löffelholz K. Klein J, et al. Among authors: koppen a. J Neurochem. 1991 Aug;57(2):370-5. doi: 10.1111/j.1471-4159.1991.tb03762.x. J Neurochem. 1991. PMID: 2072091
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