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Epidermal growth factor does not cross the blood-brain barrier

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Summary

To measure the passage of epidermal growth factor (EGF) through the blood-brain barrier (BBB) 125Ilabeled EGF was injected intravenously into adult rats. The distribution of 125I-EGF in the blood and cerebrospinal fluid (CSF) was determined over a time period of several hours. Between 2 to 6 h a stable distribution of intact 125IEGF in CSF was measured to be approximately 1/500 of the blood-borne EGF, an equilibrium value below those obtained by other investigators for BBB-impermeable compounds, such as inulin and bovine serum albumin. Our data indicate that 125I-EGF, although clearly detectable in the CSF, does not cross the BBB at a higher rate or in higher quantities than would be expected from its molecular size.

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Abbreviations

BBB :

blood-brain barrier

BSA :

bovine serum albumin

CSF :

cerebrospinal fluid

EGF :

epidermal growth factor

PBS :

phosphate-buffered saline

SDS-PAGE :

sodium dodecylsulfate polyacrylamide gel electrophoresis

TBS :

Tris-buffered saline

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Nave, K.A., Probstmeier, R. & Schachner, M. Epidermal growth factor does not cross the blood-brain barrier. Cell Tissue Res. 241, 453–457 (1985). https://doi.org/10.1007/BF00217193

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