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- W2124629128 abstract "The clinical reliability of measuring cholecystokinin (CCK) peptides in the cerebrospinal fluid (CSF) has not been fully elucidated. Therefore, we have assayed CCK-8S and CCK-4 in CSF obtained from 14 healthy male subjects, lumbar-punctured at the L4-5 level following a strictly standardised procedure. CSF concentrations of free CCK-8S and free CCK-4 were used as dependent variables while age, height, body weight, atmospheric pressure and some other factors served as independent variables. It was shown that the CCK-8S ratio between the second (7-12 ml) and first (0-6 ml) CSF fractions, correlated significantly with the atmosphere pressure at the time of puncture. Neither CCK-8S nor CCK-4 displayed concentration gradients in CSF. The CCK-4 levels, expressed as pmol l-1 in the total amount of CSF were found to be positively correlated with the neuraxis distance in the lying position and negatively with the neuraxis distance in the sitting position. Furthermore, CCK-4, expressed as pmol l-1 per min of tapping-time (pmol l-1 min-1), showed a negative correlation with storage time, presumably mirroring a proteolytic process. CCK-8S and CCK-4 intercorrelated positively independently of whether expressed as pmol l-1 or pmol l-1 min-1. In conclusion, the results of this exploratory study indicate that the neuraxis distance (in the sitting and lying positions) and storage-time have to be accounted for when interpreting data on CSF levels of CCK-4. Attention has to be paid to the potential influence of atmospheric pressure on the concentration ratio of CCK-8S." @default.
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- W2124629128 date "1997-01-01" @default.
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- W2124629128 title "Cholecystokinin peptides in cerebrospinal fluid: a study in healthy male subjects" @default.
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- W2124629128 doi "https://doi.org/10.1016/s0167-0115(96)02104-0" @default.
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