BACKGROUND: Endothelial lipase (EL) regulates the metabolism of HDL cholesterol (HDL-C). However, the role of EL in regulating plasma HDL-C concentrations and EL's potential involvement in atherosclerosis in humans has not been fully investigated due to the lack of reliable assays for EL mass. We developed an ELISA system for serum EL mass. METHODS: Human recombinant EL proteins, purified from cultured media of human EL-transfected Chinese hamster ovary cells, were used as antigen and calibrator. Two specific monoclonal antibodies were generated in mice against recombinant EL protein for a sandwich ELISA. We measured EL mass in human serum using EL recombinant protein as a calibration standard. RESULTS: The EL antibodies did not cross-react with lipoprotein lipase and hepatic triglyceride lipase. The detection limit of the ELISA was 20 pg/mL, which is approximately 10 times lower than that of previous ELISA systems. Recovery of spiked EL in serum was 90%-105%. Assay linearity was intact with a >4-fold dilution of serum. Intra- and interassay CVs were <5%. The serum EL mass in 645 human subjects was [mean (SE)] 344.4 (7.7) pg/mL (range 55.2-1387.7 pg/mL). Interestingly, serum EL mass was increased in patients with diagnosed cardiovascular disease and inversely correlated with serum HDL-C concentrations. There was no difference in EL mass between pre- and postheparin plasma samples. CONCLUSIONS: This ELISA should be useful for clarifying the impact of EL on HDL metabolism and EL's potential role in atherosclerosis.
BACKGROUND:Endothelial lipase (EL) regulates the metabolism of HDL cholesterol (HDL-C). However, the role of EL in regulating plasma HDL-C concentrations and EL's potential involvement in atherosclerosis in humans has not been fully investigated due to the lack of reliable assays for EL mass. We developed an ELISA system for serum EL mass. METHODS:Human recombinant EL proteins, purified from cultured media of humanEL-transfected Chinese hamster ovary cells, were used as antigen and calibrator. Two specific monoclonal antibodies were generated in mice against recombinant EL protein for a sandwich ELISA. We measured EL mass in human serum using EL recombinant protein as a calibration standard. RESULTS: The EL antibodies did not cross-react with lipoprotein lipase and hepatic triglyceride lipase. The detection limit of the ELISA was 20 pg/mL, which is approximately 10 times lower than that of previous ELISA systems. Recovery of spiked EL in serum was 90%-105%. Assay linearity was intact with a >4-fold dilution of serum. Intra- and interassay CVs were <5%. The serum EL mass in 645 human subjects was [mean (SE)] 344.4 (7.7) pg/mL (range 55.2-1387.7 pg/mL). Interestingly, serum EL mass was increased in patients with diagnosed cardiovascular disease and inversely correlated with serum HDL-C concentrations. There was no difference in EL mass between pre- and postheparin plasma samples. CONCLUSIONS: This ELISA should be useful for clarifying the impact of EL on HDL metabolism and EL's potential role in atherosclerosis.
Authors: Jun Eguchi; Kazuya Miyashita; Isamu Fukamachi; Katsuyuki Nakajima; Masami Murakami; Yuko Kawahara; Toru Yamashita; Yasuyuki Ohta; Koji Abe; Atsuko Nakatsuka; Mai Mino; Satoru Takase; Hiroaki Okazaki; Robert A Hegele; Michael Ploug; Xuchen Hu; Jun Wada; Stephen G Young; Anne P Beigneux Journal: J Clin Lipidol Date: 2018-10-24 Impact factor: 4.766
Authors: Xuchen Hu; Geesje M Dallinga-Thie; G Kees Hovingh; Sandy Y Chang; Norma P Sandoval; Tiffany Ly P Dang; Isamu Fukamachi; Kazuya Miyashita; Katsuyuki Nakajima; Masami Murakami; Loren G Fong; Michael Ploug; Stephen G Young; Anne P Beigneux Journal: J Clin Lipidol Date: 2017-06-13 Impact factor: 4.766
Authors: Manuela Gago-Dominguez; Carmen M Redondo; Manuel Calaza; Marcos Matabuena; Maria A Bermudez; Roman Perez-Fernandez; María Torres-Español; Ángel Carracedo; J Esteban Castelao Journal: Sci Rep Date: 2021-05-17 Impact factor: 4.379