Ganglioside Biosynthesis in Developing Brains and Apoptotic Cancer Cells: X. Regulation of Glyco-genes Involved in GD3 and Sialyl-Lex/a Syntheses

Overview

Journal Neurochem Res

Specialties Chemistry
Neurology

Date 2012 Apr 11

PMID 22488330

Citations 2

Authors

Subhash Basu

Rui Ma

Joseph R Moskal

Manju Basu

Affiliations

Soon will be listed here.

Abstract

Gangliosides, the acidic glycosphingolipids (GSLs) containing N-acetylgalactosamine and sialic acid are ubiquitous in the central nervous system. At least six DSL-glycosyltransferase activities (GLTs Gangliosides, the acidic glycosphingolipids (GSLs) containing N-acetylgalactosamine and sialic acid (or NAc-Neuraminic acid) are ubiquitous in the central nervous system. At least six GSL-glycosyltransferase activities (GLTs) of Basu-Roseman pathway catalyzing the biosynthesis of these gangliosides have been characterized in developing chicken brains. Most of these glyco-genes are expressed in the early stages (7-17 days) of brain development and lowered in the adult stage, but the cause of reduction of enzymatic activities of these GLTs in the adult stages is not known. In order to study glyco-gene regulation we used four clonal metastatic cancer cells of colon and breast cancer tissue origin (Colo-205, SKBR-3, MDA-468, and MCF-3). The glyco-genes for synthesis of SA-LeX and SA-LeA (which contain N-acetylglucosamine, sialic acid and fucose) in these cells were modulated differently at different phases (between 2 and 48 h) of apoptotic inductions. L-PPMP, D-PDMP (inhibitor of glucosylceramide biosynthesis), Betulinic Acid (a triterpinoid isolated from bark of certain trees and used for cancer treatment in China), Tamoxifen a drug in use in the west for treatment of early stages of the disease in breast cancer patients), and cis-platin (an inhibitor of DNA biosynthesis used for testicular cancer patients) were used for induction of apoptosis in the above-mentioned cell lines. Within 2-6 h, transcriptional modulation of a number of glyco-genes was observed by DNA-micro-array (containing over 300 glyco genes attached to the glass cover slips) studies. Under long incubation time (24-48 h) almost all of the glyco-genes were downregulated. The cause of these glyco-gene regulations during apoptotic induction in metastatic carcinoma cells is unknown and needs future investigations for further explanations. These apoptotic agents could be employed as a new generation of anti-cancer drugs after properly delivered to the patients.

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