Fructose metabolism in proximal tubules (Rattus norvegicus)
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Description
Most of the fructose absorbed in the gut is cleared in its first hepatic passage; however, under certain conditions, such as ingestion of large amounts of free fructose, the sugar can reach high levels in plasma and filtrate through the glomeruli. Filtered fructose is reabsorbed by proximal tubule cells. Ingestion of large quantities of free fructose, usually from high fructose corn syrup, has been associated with obesity, metabolic syndrome and elevated blood pressure. Salt-sensitivity of blood pressure in rodents receiving 10 or 20% fructose solutions is well documented. Sensitivity to salt, should include a renal defect, otherwise pressure natriuretis would restore Na balance.
This pathway features the conversion of fructose to glucose in proximal tubule cells. It was adapted from the KEGG "FRUCTOSE AND MANNOSE METABOLISM" pathway, using deep sequencing data from microdissected renal proximal tubules to confirm the presence of the enzyme transcripts.
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Bibliography
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- Lee JW, Chou CL, Knepper MA; ''Deep Sequencing in Microdissected Renal Tubules Identifies Nephron Segment-Specific Transcriptomes.''; J Am Soc Nephrol, 2015 PubMed Europe PMC Scholia
- Gonzalez-Vicente A, Cabral PD, Hong NJ, Asirwatham J, Saez F, Garvin JL; ''Fructose reabsorption by rat proximal tubules: role of Na+-linked cotransporters and the effect of dietary fructose.''; Am J Physiol Renal Physiol, 2019 PubMed Europe PMC Scholia
- Fukuzawa T, Fukazawa M, Ueda O, Shimada H, Kito A, Kakefuda M, Kawase Y, Wada NA, Goto C, Fukushima N, Jishage K, Honda K, King GL, Kawabe Y; ''''; , PubMed Europe PMC Scholia
- Horiba N, Masuda S, Ohnishi C, Takeuchi D, Okuda M, Inui K; ''Na(+)-dependent fructose transport via rNaGLT1 in rat kidney.''; FEBS Lett, 2003 PubMed Europe PMC Scholia
- Burch HB, Lowry OH, Meinhardt L, Max P Jr, Chyu K; ''''; , PubMed Europe PMC Scholia
- Tazawa S, Yamato T, Fujikura H, Hiratochi M, Itoh F, Tomae M, Takemura Y, Maruyama H, Sugiyama T, Wakamatsu A, Isogai T, Isaji M; ''''; , PubMed Europe PMC Scholia
- Gonzalez-Vicente A, Garvin JL, Hopfer U; ''Transcriptome signature for dietary fructose-specific changes in rat renal cortex: A quantitative approach to physiological relevance.''; PLoS One, 2018 PubMed Europe PMC Scholia
- Grempler R, Augustin R, Froehner S, Hildebrandt T, Simon E, Mark M, Eickelmann P; ''''; , PubMed Europe PMC Scholia
- Burch HB, Choi S, Dence CN, Alvey TR, Cole BR, Lowry OH.; ''''; , PubMed Europe PMC Scholia
History
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External references
DataNodes
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Name | Type | Database reference | Comment |
---|---|---|---|
Akr1b1 | GeneProduct | 24192 (Entrez Gene) | |
Aldoa | GeneProduct | 24189 (Entrez Gene) | |
Aldob | GeneProduct | 24190 (Entrez Gene) | |
Dihydroacetone-P | Metabolite | HMDB01473 (HMDB) | |
Fbp1 | GeneProduct | 24362 (Entrez Gene) | |
Fructose-1,6-biP | Metabolite | HMDB01058 (HMDB) | |
Fructose-1-P | Metabolite | HMDB01076 (HMDB) | |
Fructose-6-P | Metabolite | HMDB00124 (HMDB) | |
Fructose | Metabolite | HMDB00660 (HMDB) | |
G6pc | GeneProduct | 25634 (Entrez Gene) | |
Glucose-6-P | Metabolite | HMDB01401 (HMDB) | |
Glucose | Metabolite | HMDB00122 (HMDB) | |
Glyderaldehyde-3-P | Metabolite | HMDB01112 (HMDB) | |
Glyderaldehyde | Metabolite | HMDB01051 (HMDB) | |
Gpi | GeneProduct | 292804 (Entrez Gene) | |
Hk1 | GeneProduct | 25058 (Entrez Gene) | |
Khk | GeneProduct | 25659 (Entrez Gene) | |
Pfkl | GeneProduct | 25741 (Entrez Gene) | |
Pfkm | GeneProduct | 65152 (Entrez Gene) | |
Pfkp | GeneProduct | 60416 (Entrez Gene) | |
Sorbitol | Metabolite | HMDB00247 (HMDB) | |
Sord | GeneProduct | 24788 (Entrez Gene) | |
Tkfc | GeneProduct | 361730 (Entrez Gene) | |
Tpi1 | GeneProduct | 24849 (Entrez Gene) |
Annotated Interactions
No annotated interactions