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- W2147788805 abstract "Background A receptor for leptin has been cloned from the choroid plexus, the site of cerebrospinal-fluid (CSF) production and the location of the blood/cerebrospinal-fluid barrier. Thus, this receptor might serve as a transporter for leptin. We have studied leptin concentrations in serum and (CSF). Methods and findings We demonstrated by radio-immunoassay and western blot the presence of leptin in human CSF. We then measured leptin in CSF and serum in 31 individuals with a wide range of bodyweight. Mean serum leptin was 318% higher in 8 obese (40.2 [SE 8.6] ng/mL) than in 23 lean individuals (9.6 [1.5] ng/mL, p<0.0005). However, the CSF leptin concentration in obese individuals (0.337 [0.04] ng/mL) was only 30% higher than in lean people (0.259 [0.26] ng/mL, p<0.1). Consequently, the leptin CSF/serum ratio in lean individuals (0.047 [0.010]) was 4.3-fold higher than that in obese individuals (0.011 [0.002], p<0.05). The relation between CSF leptin and serum leptin was best described by a logarithmic function (r=0.52, p<0.01). Interpretation Our data suggest that leptin enters the brain by a saturable transport system. The capacity of leptin transport is lower in obese individuals, and may provide a mechanism for leptin resistance." @default.
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- W2147788805 date "1996-07-01" @default.
- W2147788805 modified "2023-10-18" @default.
- W2147788805 title "Decreased cerebrospinal-fluid/serum leptin ratio in obesity: a possible mechanism for leptin resistance" @default.
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- W2147788805 doi "https://doi.org/10.1016/s0140-6736(96)03173-x" @default.
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