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Other Glycolytic Pathways

Other Glycolytic Pathways

The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...

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A Model of Chronic Nutrient Infusion in the Rat

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Published on: August 14, 2013

Alternative pathways of glucose utilization in developing rat spinal cord.

A J Cheeseman¹, J S Hothersall

¹Courtauld Institute of Biochemistry, The Middlesex Hospital Medical School, Mortimer Street, London, WIP 7PN, U.K.

Neurochemistry International

|May 27, 2010

Summary

Glucose metabolism in developing rat spinal cords peaks during myelination. The pentose phosphate pathway, though low in activity, is crucial for spinal cord development and function.

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Area of Science:

Neuroscience
Biochemistry
Developmental Biology

Background:

The developing central nervous system exhibits unique metabolic demands.
Understanding glucose utilization pathways is key to comprehending neural development and myelination.

Purpose of the Study:

To investigate the activity of alternative glucose metabolism pathways in the developing rat spinal cord.
To determine the role of the pentose phosphate pathway in spinal cord development and myelination.

Main Methods:

Utilized radiolabeled glucose ((14)C) to measure CO(2) release and lipid incorporation.
Assessed glycolytic route, tricarboxylic acid cycle, and pentose phosphate pathway activities at different developmental stages.
Administered 6-aminonicotinamide to evaluate the impact on the pentose phosphate pathway and motor function.

Main Results:

Peak total lipid synthesis occurred at 15 days postpartum, coinciding with peak myelination.
Glycolysis, TCA cycle, and pentose phosphate pathway activities were highest up to 20 days postpartum.
Inhibition of the pentose phosphate pathway by 6-aminonicotinamide led to spastic paralysis, despite its low overall activity.

Conclusions:

Alternative glucose utilization pathways are highly active during critical periods of rat spinal cord development and myelination.
The pentose phosphate pathway plays a vital, albeit quantitatively small, role in the developing rat spinal cord.
Metabolic alterations, particularly in the pentose phosphate pathway, can significantly impair neural development and function.