• Title/Summary/Keyword: Environmental chemistry

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Heat Shock Protein 60 Is a $Mg^{2+}$-dependent, Membrane-associated and Neutral Sphingomyelinase That Mediates TNF-alpha Signaling

  • Jung, Sang-Mi;Jung, Sung-Yun;Chang, Dong-Hoon;Jeong, Hyun-Chul;Chin, Mi-Reyoung;Jeong, Eui-Man;Jo, Dong-Hwan;Jeon, Hyung-Jun;Jung, Kwnag-Mook
    • Proceedings of the PSK Conference
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    • 2003.10b
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    • pp.103.2-103.2
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    • 2003

  • The hydrolysis of sphingomyelin (SM), known as the SM pathway, is induced by the activation of sphingomyelinase (SMase) to generate the second messenger ceramide, which plays a key role in cellular responses such as apoptosis, differentiation, senescence, and inflammation. Here, we identified a 60 kDa membrane-associated, neutral and Mg$\^$2+/-dependent SMase, termed N-SMase $\varepsilon$, from mammalian brains, which was revealed as the heat shock protein 60 (HSP60) through cDNA cloning and mass spectrometrical analysis. (omitted)

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Development of a Label-Free LC-MS/MS-Based Glucosylceramide Synthase Assay and Its Application to Inhibitors Screening for Ceramide-Related Diseases

  • Fu, Zhicheng;Yun, So Yoon;Won, Jong Hoon;Back, Moon Jung;Jang, Ji Min;Ha, Hae Chan;Lee, Hae Kyung;Shin, In Chul;Kim, Ju Yeun;Kim, Hee Soo;Kim, Dae Kyong
    • Biomolecules & Therapeutics
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    • v.27 no.2
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    • pp.193-200
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    • 2019

  • Ceramide metabolism is known to be an essential etiology for various diseases, such as atopic dermatitis and Gaucher disease. Glucosylceramide synthase (GCS) is a key enzyme for the synthesis of glucosylceramide (GlcCer), which is a main ceramide metabolism pathway in mammalian cells. In this article, we developed a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method to determine GCS activity using synthetic non-natural sphingolipid C8-ceramide as a substrate. The reaction products, C8-GlcCer for GCS, could be separated on a C18 column by reverse-phase high-performance liquid chromatography (HPLC). Quantification was conducted using the multiple reaction monitoring (MRM) mode to monitor the precursor-to-product ion transitions of m/z $588.6{\rightarrow}264.4$ for C8-GlcCer at positive ionization mode. The calibration curve was established over the range of 0.625-160 ng/mL, and the correlation coefficient was larger than 0.999. This method was successfully applied to detect GCS in the human hepatocellular carcinoma cell line (HepG2 cells) and mouse peripheral blood mononuclear cells. We also evaluated the inhibition degree of a known GCS inhibitor 1-phenyl-2-decanoylamino-3-morpholino-1-propanol (PDMP) on GCS enzymatic activity and proved that this method could be successfully applied to GCS inhibitor screening of preventive and therapeutic drugs for ceramide metabolism diseases, such as atopic dermatitis and Gaucher disease.

  • https://doi.org/10.4062/biomolther.2018.122 인용 PDF KSCI