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. Since the bulk of fructose and other sugars are absorbed in proximal tubules, it is believed that fructose affect this nephron segment first. This pathway features the metabolism of fructose in proximal tubule cells. It was created using biochemical data showing metabolites accumulation and enzymatic activities in proximal tubules challenged with fructose. Also deep sequencing data from microdissected renal proximal tubules was used to confirm the presence of the transcript of the enzymes. Gene transcripts are annotated using ENTREZ Gene ID.

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Bibliography

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  1. Burch HB, Choi S, Dence CN, Alvey TR, Cole BR, Lowry OH.; ''''; , PubMed
  2. ''''; , PubMed
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  4. Lee JW, Chou CL, Knepper MA; ''Deep Sequencing in Microdissected Renal Tubules Identifies Nephron Segment-Specific Transcriptomes.''; J Am Soc Nephrol, 2015 PubMed
  5. ''''; , PubMed
  6. ''''; , PubMed

History

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CompareRevisionActionTimeUserComment
91517view18:54, 8 March 2017Khanspersfixed xref for pathway node
90399view14:55, 11 November 2016AgustinGVModified description
90398view14:41, 11 November 2016AgustinGVReferences added
90397view14:38, 11 November 2016AgustinGVSpecify description
90396view14:37, 11 November 2016AgustinGVModified title
90395view14:35, 11 November 2016AgustinGVAdd Fructose Transporters
90394view14:05, 11 November 2016AgustinGVMore info on text
90393view14:02, 11 November 2016AgustinGVAdd descriptions and info on text
90392view13:56, 11 November 2016AgustinGVSpecify description
90391view13:56, 11 November 2016AgustinGVSpecify description
90386view21:57, 10 November 2016AgustinGVSpecify description
90385view21:14, 10 November 2016AgustinGV
90383view18:30, 10 November 2016AgustinGV
90382view18:26, 10 November 2016AgustinGV
90381view18:23, 10 November 2016AgustinGV
89604view18:08, 19 September 2016AgustinGVModified description
89603view18:05, 19 September 2016AgustinGVModified description
89598view16:00, 19 September 2016AgustinGVOntology Term : 'hypertension' added !
89597view15:59, 19 September 2016AgustinGVOntology Term : 'renal hypertension' added !
89596view15:59, 19 September 2016AgustinGVOntology Term : 'epithelial cell of proximal tubule' added !
89595view15:59, 19 September 2016AgustinGVModified description
89569view07:53, 17 September 2016EgonwFixed casing in two HDMB identifiers.
89566view13:53, 16 September 2016AgustinGVCorrect misalignment
89565view13:46, 16 September 2016AgustinGVCorrect misalignment
89559view13:35, 16 September 2016AgustinGVAdd ID
89558view13:33, 16 September 2016AgustinGVModified description
89557view13:32, 16 September 2016AgustinGVAdd ID
89556view13:31, 16 September 2016AgustinGVAdd ID
89555view13:30, 16 September 2016AgustinGVAdd Identifier
89554view13:28, 16 September 2016AgustinGVSpecify description
89550view13:23, 16 September 2016AgustinGVModified description
89549view13:23, 16 September 2016AgustinGVModified description
89499view16:24, 15 September 2016AgustinGVOntology Term : 'hereditary fructose intolerance syndrome' added !
89498view16:23, 15 September 2016AgustinGVOntology Term : 'fructose-1,6-bisphosphatase deficiency' added !
89497view16:22, 15 September 2016AgustinGVOntology Term : 'carbohydrate metabolic pathway' added !
89495view16:11, 15 September 2016AgustinGVSpecify description
89494view15:59, 15 September 2016AgustinGVNew pathway

External references

Datanodes

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NameTypeDatabase referenceComment
Akr1b1GeneProduct24192 (Entrez Gene)
AldoaGeneProduct24189 (Entrez Gene)
AldobGeneProduct24190 (Entrez Gene)
Dihydroacetone-PMetaboliteHMDB01473 (HMDB)
Fbp1GeneProduct24362 (Entrez Gene)
Fructose-1,6-biPMetaboliteHMDB01058 (HMDB)
Fructose-1-PMetaboliteHMDB01076 (HMDB)
Fructose-6-PMetaboliteHMDB00124 (HMDB)
FructoseMetaboliteHMDB00660 (HMDB)
G6pcGeneProduct25634 (Entrez Gene)
Glucose-6-PMetaboliteHMDB01401 (HMDB)
GlucoseMetaboliteHMDB00122 (HMDB)
Glyderaldehyde-3-PMetaboliteHMDB01112 (HMDB)
GlyderaldehydeMetaboliteHMDB01051 (HMDB)
GpiGeneProduct292804 (Entrez Gene)
Hk1GeneProduct25058 (Entrez Gene)
KhkGeneProduct25659 (Entrez Gene)
Neutral lipid SynthesisPathwayWP3901 (WikiPathways)
PfklGeneProduct25741 (Entrez Gene)
PfkmGeneProduct65152 (Entrez Gene)
PfkpGeneProduct60416 (Entrez Gene)
Slc2a2GeneProduct25351 (Entrez Gene)
Slc2a5GeneProduct65197 (Entrez Gene)
Slc5a10GeneProduct303205 (Entrez Gene)
Slc5a9GeneProduct366441 (Entrez Gene)
SorbitolMetaboliteHMDB00247 (HMDB)
SordGeneProduct24788 (Entrez Gene)
TkfcGeneProduct361730 (Entrez Gene)
Tpi1GeneProduct24849 (Entrez Gene)

Annotated Interactions

No annotated interactions

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