TY  - JOUR
A1  - Peck, Barrie
A1  - Schug, Zachary T.
A1  - Zhang, Qifeng
A1  - Dankworth, Beatrice
A1  - Jones, Dylan T.
A1  - Smethurst, Elizabeth
A1  - Patel, Rachana
A1  - Mason, Susan
A1  - Jian, Ming
A1  - Saunders, Rebecca
A1  - Howell, Michael
A1  - Mitter, Richard
A1  - Spencer-Dene, Bradley
A1  - Stamp, Gordon
A1  - McGarry, Lynn
A1  - James, Daniel
A1  - Shanks, Emma
A1  - Aboagye, Eric O.
A1  - Critchlow, Susan E.
A1  - Leung, Hing Y.
A1  - Harris, Adrian L.
A1  - Wakelam, Michael J. O.
A1  - Gottlieb, Eyal
A1  - Schulze, Almut
T1  - Inhibition of fatty acid desaturation is detrimental to cancer cell survival in metabolically compromised environments
JF  - Cancer & Metabolism
N2  - Background
Enhanced macromolecule biosynthesis is integral to growth and proliferation of cancer cells. Lipid biosynthesis has been predicted to be an essential process in cancer cells. However, it is unclear which enzymes within this pathway offer the best selectivity for cancer cells and could be suitable therapeutic targets.

Results
Using functional genomics, we identified stearoyl-CoA desaturase (SCD), an enzyme that controls synthesis of unsaturated fatty acids, as essential in breast and prostate cancer cells. SCD inhibition altered cellular lipid composition and impeded cell viability in the absence of exogenous lipids. SCD inhibition also altered cardiolipin composition, leading to the release of cytochrome C and induction of apoptosis. Furthermore, SCD was required for the generation of poly-unsaturated lipids in cancer cells grown in spheroid cultures, which resemble those found in tumour tissue. We also found that SCD mRNA and protein expression is elevated in human breast cancers and predicts poor survival in high-grade tumours. Finally, silencing of SCD in prostate orthografts efficiently blocked tumour growth and significantly increased animal survival.

Conclusions
Our data implicate lipid desaturation as an essential process for cancer cell survival and suggest that targeting SCD could efficiently limit tumour expansion, especially under the metabolically compromised conditions of the tumour microenvironment.
KW  - SCD
KW  - lipidomics
KW  - prostate cancer
KW  - breast cancer
KW  - lipid desaturation
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-145905
VL  - 4
IS  - 6
ER  - 
TY  - JOUR
A1  - Amatobi, Kelechi M.
A1  - Ozbek-Unal, Ayten Gizem
A1  - Schäbler, Stefan
A1  - Deppisch, Peter
A1  - Helfrich-Förster, Charlotte
A1  - Mueller, Martin J.
A1  - Wegener, Christian
A1  - Fekete, Agnes
T1  - The circadian clock is required for rhythmic lipid transport in Drosophila in interaction with diet and photic condition
JF  - Journal of Lipid Research
N2  - Modern lifestyle is often at odds with endogenously driven rhythmicity, which can lead to circadian disruption and metabolic syndrome. One signature for circadian disruption is a reduced or altered metabolite cycling in the circulating tissue reflecting the current metabolic status. Drosophila is a well-established model in chronobiology, but day-time dependent variations of transport metabolites in the fly circulation are poorly characterized. Here, we sampled fly hemolymph throughout the day and analyzed diacylglycerols (DGs), phosphoethanolamines (PEs) and phosphocholines (PCs) using LC-MS. In wild-type flies kept on sugar-only medium under a light-dark cycle, all transport lipid species showed a synchronized bimodal oscillation pattern with maxima at the beginning and end of the light phase which were impaired in period01 clock mutants. In wild-type flies under constant dark conditions, the oscillation became monophasic with a maximum in the middle of the subjective day. In strong support of clock-driven oscillations, levels of the targeted lipids peaked once in the middle of the light phase under time-restricted feeding independent of the time of food intake. When wild-type flies were reared on full standard medium, the rhythmic alterations of hemolymph lipid levels were greatly attenuated. Our data suggest that the circadian clock aligns daily oscillations of DGs, PEs, and PCs in the hemolymph to the anabolic siesta phase, with a strong influence of light on phase and modality.
KW  - hemolymph lipids
KW  - lipidomics
KW  - circadian rhythm
KW  - feeding
KW  - locomotor activity
KW  - light-driven metabolism
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-349961
VL  - 64
IS  - 10
ER  -