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La glucólisis impulsada por la fructosa apoya la resistencia a la anoxia en la rata topo desnuda
Thomas J Park1, Jane Reznick2, Bethany L Peterson3
1Laboratory of Integrative Neuroscience, Department of Biological Sciences, University of Illinois at Chicago, Chicago, IL 60607, USA. glewin@mdc-berlin.de tpark@uic.edu.
Science (New York, N.Y.)
|April 22, 2017
Resumen
Las ratas topo desnudas africanas sobreviven a la privación extrema de oxígeno cambiando al metabolismo de la fructosa. Esta adaptación metabólica única en ratas topo desnudas (Heterocephalus glaber) ofrece ideas para mitigar el daño hipóxico en los humanos.
Área de la Ciencia:
- Zoología
- Fisiología Comparada
- La bioquímica
Sus antecedentes:
- La rata topo desnuda africana (Heterocephalus glaber) habita en un entorno subterráneo naturalmente hipóxico.
- Estos roedores muestran una notable tolerancia a los períodos prolongados de baja oxigenación (hipoxia) y a la privación completa de oxígeno (anoxia).
Objetivo del estudio:
- Para investigar los mecanismos metabólicos que subyacen a la extraordinaria tolerancia de la rata topo desnuda a la anoxia.
- Para identificar las vías moleculares que permiten la supervivencia durante la privación severa de oxígeno.
Principales métodos:
- Inducción experimental de la anoxia en ratas topo desnudas.
- Análisis de las vías metabólicas, incluida la acumulación y el metabolismo de la fructosa.
- Análisis de la expresión génica de las enzimas y transportadores metabólicos clave (por ejemplo, GLUT5, cetohexoquinasa).
Principales resultados:
- Las ratas topo desnudas cambian a un metabolismo anaeróbico alimentado por fructosa durante la anoxia.
- La fructosa se acumula activamente y se metaboliza en lactato en el cerebro.
- La upregulación del transportador de fructosa GLUT5 y la cetohexoquinasa son las firmas moleculares clave.
- El metabolismo de la fructosa evita la inhibición de la fosfructokinasa, apoyando la glucólisis y la viabilidad celular.
Conclusiones:
- La rata topo desnuda emplea un recableado metabólico único de la glucólisis, utilizando fructosa para sobrevivir a la anoxia.
- Esta estrategia metabólica impulsada por la fructosa evita los efectos letales de la privación de oxígeno.
- La comprensión de este mecanismo podría conducir a nuevas estrategias terapéuticas para las condiciones hipóxicas en enfermedades humanas.
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