Showing posts with label 27-hydroxycholesterol. Show all posts
Showing posts with label 27-hydroxycholesterol. Show all posts

Monday, December 05, 2016

Fatty Acids and IBD and Colitis

The Dangers of a High Fatty Acid Diets
Our westernized high-fat diet (HFD) is associated with the development of inflammatory bowel disease (IBD), Colitis and other intestinal related diseases and cancers. Here one the root causes is identified to elevated production of pro-inflammatory cytokine-IL-1β by macrophages. It is suspected that HFD sets off an autoimmune like cascade.

This cascade is triggered by NLRP3 inflammasomes. Our Apoptosis Kit-Magic Red-Real Time Cathepsin B is used to demonstrate these inflammasomes are activated via Cathepsin B Release: Shengnan Zhao, Zizhen Gong1, Jiefei Zhou1, Chunyan Tian, Yanhong Gao, Congfeng Xu, Yingwei Chen, Wei Cai and Jin Wu1Deoxycholic Acid Triggers NLRP3 Inflammasome Activation and Aggravates DSS-Induced Colitis in Mice. Front. Immunol., 28 November 2016 | http://dx.doi.org/10.3389/fimmu.2016.00536 ...Lipopolysaccharide-primed J774A.1 cells were incubated with or without DCA (100 μM, 24 h); then, the cells were stained with Lyso Tracker Green DND-26 (Invitrogen) or magic red cathepsin B fluorogenic substrate z-Arg-Arg cresyl violet (Neuromics) for 1 h, followed by Hoechst staining for half an hour. Fluorogenic signals were captured by inverted fluorescence microscope (Leica)...

Image: Lipopolysaccharide-primed J774A.1 cells were incubated with or without DCA (100 μM, 24 h); then, the cells were stained with Lyso Tracker Green DND-26 (Invitrogen) or Magic RedTM Cathepsin B fluorogenic substrate z-Arg-Arg cresyl violet (Neuromics) for 1 h, followed by Hoechst staining for half an hour. Fluorogenic signals were captured by inverted fluorescence microscope (Leica). Front. Immunol., 28 November 2016 http://dx.doi.org/10.3389/fimmu.2016.00536
We will continue to post how our customers are using our Apoptosis Kits for their discoveries here.

Wednesday, January 14, 2009

24-OHC-27-OHC and Alzheimer's

Dr. Othman Ghribi and his team at University of North Dakota have just published interesting results regarding the relationship between 24-hydroxycholesterol (24-OHC) and 27-hydroxycholesterol (27-OHC).

27-OHC increased levels of amyloid precursor protein (APP) as well as beta-secretase (BACE1)
the enzyme that cleaves APP to yield Abeta, a molecule that causes alzheimer's.

24-OHC are associated with increased levels of sAPPalpha, suggesting that 24-OHC favors the processing of APP to the non-amyloidogenic pathway.

Futher study of this relationship between 27 and 24-OHC could yield possible targets for decreasing the cleavage of alzheimer's causing proteins and result in more step towards the Azheimer's therapies.

Here's the publication.

Prasanthi JRP, Huls A, Thomasson S, Thompson A, Schommer E, Ghribi O. Differential effects of 24-hydroxycholesterol and 27-hydroxycholesterol on beta-amyloid precursor protein levels and processing in human neuroblastoma SH-SY5Y cells. Molecular Neurodegeneration 2009, 4:1 (6 January 2009).

Image:
Treatment with 24-OHC, but not with 27-OHC, increased ABCA1 and ABCG1 levels. Representative Western blots