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Angiopoietin-like protein 4(E40K) and ANGPTL4/8 complex have reduced, temperature-dependent LPL-inhibitory activity compared to ANGPTL4

Chen, Yan Q., Pottanat, Thomas G., Siegel, Robert W., Ehsani, Mariam, Qian, Yue-Wei, Roell, William C., Konrad, Robert J.·2021·Biochemical and Biophysical Research Communications
DOI 10.1016/j.bbrc.2020.11.053
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Abstract

We previously demonstrated that angiopoietin-like 8 (ANGPTL8) forms a localized complex with ANGPTL4 to reduce its lipoprotein lipase (LPL)-inhibitory activity and enable increased postprandial uptake of fatty acids (FA) into adipose tissue. Because prolonged cold exposure may increase adipose tissue FA uptake and decrease circulating triglycerides (TG) by reducing ANGPTL4 expression and inducing ANGPTL8 expression (and thus ANGPTL4/8 expression), we investigated the effect of temperature on ANGPTL4 and ANGPTL4/8 LPL-inhibitory activities in vitro. As the ANGPTL4(E40K) mutation results in decreased TG, we also characterized ANGPTL4(E40K) and ANGPTL4(E40K)/8 complex LPL-inhibitory activities. Interestingly, while ANGPTL3, ANGPTL3/8, and ANGPTL4 showed similar LPL inhibition at 37 °C and 22 °C, the already reduced LPL-inhibitory activity of ANGPTL4/8 at 37 °C was even more decreased at 22 °C. At 37 °C, ANGPTL4(E40K) manifested decreased LPL-inhibitory activity compared to ANGPTL4/8, while ANGPTL4(E40K)/8 had even further reduced potency. Remarkably, ANGPTL4/8, ANGPTL4(E40K), and ANGPTL4(E40K)/8 were each actually capable of stimulating LPL activity at 22 °C. Together, these results indicate that ANGPTL4/8 stimulation of LPL activity at low temperatures may represent an additional mechanism for further increasing adipose tissue FA uptake during cold exposure, beyond that already occurring due to decreased ANGPTL4 expression and increased ANGPTL8 expression. In addition, because…

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Research works printed but not linked: 19

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Metadata

Authors
Chen, Y. Q., Pottanat, T. G., Siegel, R. W., Ehsani, M., Qian, Y.-W., Roell, W. C., & Konrad, R. J.
ORCID
Siegel, Robert W.
Venue
Biochemical and Biophysical Research Communications
Publisher
Elsevier BV
Published
2021-01
Volume
534
Pages
498-503
ISSN
0006-291X
DOI
10.1016/j.bbrc.2020.11.053
Cited by
12
References
2
Language
en
Licence
Funders
Eli Lilly and Company

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