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- W2014380037 abstract "A sensitive enzyme-linked immunosorbent assay (ELISA) for quantitation of human epidermal growth factor (EGF) was employed to study EGF in urine and blood. The EGF/creatinine ratio in urine was significantly higher for women (range and (median); 0.20–0.83 (0.50) nmol EGF/mmol creatinine) than for men (0.17–0.63 (0.30) nmol EGF/mmol creatinine). We were not able to demonstrate EGF in plasma (median plasma EGF < 0.01 nmol/l) whereas serum contained a range and (median) of 0.02–0.31 (0.12) nmol EGF/l. The amount of EGF in serum showed a weak correlation to the platelet count (r = 0.327). EGF was partly purified by affinity chromatography from urine (urine EGF) and from activated platelets in platelet rich plasma (blood EGF). Both blood and urine contained a high molecular weight form of EGF (HMW EGF) as well as 6 kDa EGF. HMW EGF from blood was similar to HMW EGF from urine concerning behaviour upon gel filtration, pI and apparent affinity constant for binding to the EGF receptor. However, HMW EGF constituted approx. 40% of blood EGF but only 10% of urinary EGF. The 6 kDa EGF from both blood and urine contained two isopeptides with pI around 4.40 and 4.15 but in various proportions. The apparent affinity constant for binding to the EGF receptor for blood 6 kDa EGF was 1.8·1010 l/mol compared to 1.0·1010 l/mol for urinary 6 kDa EGF and 0.8·1010 l/mol for HMW EGF from both blood and urine. The present study suggests that the processing of the EGF precursor differs in the blood and in the kidneys and that 6 kDa EGF from blood and urine binds to the EGF receptor with a higher apparent affinity constant than does HMW EGF." @default.
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- W2014380037 title "Human epidermal growth factor—on molecular forms present in urine and blood" @default.
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- W2014380037 doi "https://doi.org/10.1016/0167-0115(92)90025-p" @default.
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