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Selected nutrients reduce the pyruvate requirement for survival in vitro of chick central nervous system neurons
Insights
Central nervous system neurons require pyruvate for survival. Specific nutrients like serine, pyridoxal, and essential amino acids in cell culture media significantly reduce the amount of pyruvate needed, aiding neuronal survival.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Central nervous system (CNS) neurons in culture require exogenous pyruvate for survival.
- The specific nutrient requirements of embryonic neurons are not fully understood.
- Existing cell culture media may contain factors that influence neuronal metabolic needs.
Purpose of the Study:
- To identify the specific low molecular weight agents in cell culture media that reduce the pyruvate requirement for CNS neurons.
- To understand the metabolic support provided by components of Dulbecco's modified Eagle's medium (DMEM) and Eagle's basal medium (EBM).
Main Methods:
- Culturing embryonic day 8 (E8) chick forebrain neurons at low density.
- Utilizing a low pyruvate concentration in Eagle's basal medium (EBM) to necessitate the presence of pyruvate-sparing agents.
- Systematically omitting constituents from Dulbecco's modified Eagle's medium (DMEM) to identify those essential for neuronal survival.
Main Results:
- Neuronal survival was dependent on a specific mixture of nutrients when pyruvate was limited.
- Key pyruvate-sparing molecules identified include serine, pyridoxal (or riboflavin and biotin), and six essential amino acids (arginine, cystine, leucine, isoleucine, tyrosine, tryptophan).
- These identified components were most effective at concentrations found in standard DMEM.
Conclusions:
- Specific amino acids and vitamins play a critical role in sparing pyruvate for developing CNS neurons.
- Understanding these nutrient interactions is crucial for optimizing neuronal cell culture conditions.
- This research identifies key nutritional components essential for the survival of cultured embryonic neurons.
Abstract:
Central nervous system neurons, cultured as monolayers at low density, need exogenous pyruvate for their survival. The pyruvate concentrations required by embryonic day 8 (E8) chick forebrain neurons are reduced substantially by other low molecular weight agents present in Dulbecco's modified Eagle's medium (DMEM) and in astroglia-conditioned Eagle's basal medium (EBM). To examine the nature of these pyruvate-sparing molecules, E8 chick forebrain neurons were cultured in EBM containing a concentration of pyruvate too low to support neuronal survival, unless sparing agents were supplied. This strategy permitted the identification of the pyruvate-sparing DMEM constituents, omission of which had led to neuronal loss. Pyruvate sparing required a mixture of (i) serine, (ii) pyridoxal (or riboflavin and biotin), and (iii) six essential amino acids: arginine, cystine, leucine, isoleucine, tyrosine, and tryptophan (each replaceable by corresponding amino acids, except tryptophan). All pyruvate-sparing contributors were optimally needed at or near their DMEM concentrations.