Monosaccharide Profiling of Silkworm (Bombyx Mori L.) Nervous System During Development and Aging

Overview

Journal Invert Neurosci

Date 2016 Jun 26

PMID 27341820

Citations 6

Authors

Seckin Soya

Umut Sahar

Sabire Karacali

Affiliations

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Abstract

Glycoconjugates have various functions in differentiation, development, aging and in all aspects of normal functioning of organisms. The reason for increased research on this topic is that glycoconjugates locate mostly on the cell surface and play crucial biological roles in the nervous system including brain development, synaptic plasticity, learning, and memory. Considering their roles in the nervous system, information about their existence in the insect nervous system is rather sparse. Therefore, in order to detect monosaccharide content of N- and O-glycans, we carried out capLC-ESI-MS/MS analysis to determine the concentration changes of glucose, mannose, galactose, N-acetylglucosamine (GlcNAc), N-acetylgalactosamine (GalNAc), fucose, xylose, arabinose, and ribose monosaccharides in the nervous system of Bombyx mori during development and aging processes. In addition to LC-MS, lectin blotting was done to detect quantitative changes in N- and O-glycans. Developmental stages were selected as 3rd (the youngest sample), 5th (young) larval instar, motionless prepupa (the oldest sample), and pupa (adult development). Derivatization of monosaccharides was performed with a solution of PMP agent and analyzed with capLC-ESI-MS/MS. For lectin blotting, determination of glycan types was carried out with Galanthus nivalis agglutinin and Peanut agglutinin lectins. In all stages, the most abundant monosaccharide was glucose. Although all monosaccharides were present most abundantly in the youngest stage (3rd instar), they are generally reduced gradually during the aging process. It was observed that amounts of monosaccharides increased again in the pupa stage. According to lectin blotting, N- and O-linked glycoproteins expressions were different and there were some specific glycoprotein expression differences between stages. These findings suggest that the glycosylation state of proteins in the nervous system changes during development and aging in insects in a similar fashion to that reported for vertebrates.

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