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That is why we accepted a challenge to create a software tool that allows deciphering the compartmentation of metabolites based on the analysis of average isotopic isomer distribution.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>The software Isodyn, which simulates the dynamics of isotopic isomer distribution in central metabolic pathways, was supplemented by algorithms facilitating the transition between various analyzed metabolic schemes, and by the tools for model discrimination. It simulated <jats:sup>13<\/jats:sup>C isotope distributions in glucose, lactate, glutamate and glycogen, measured by mass spectrometry after incubation of hepatocytes in the presence of only labeled glucose or glucose and lactate together (with label either in glucose or lactate). The simulations assumed either a single intracellular hexose phosphate pool, or also channeling of hexose phosphates resulting in a different isotopic composition of glycogen. Model discrimination test was applied to check the consistency of both models with experimental data. Metabolic flux profiles, evaluated with the accepted model that assumes channeling, revealed the range of changes in metabolic fluxes in liver cells.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions<\/jats:title>\n            <jats:p>The analysis of compartmentation of metabolic networks based on the measured <jats:sup>13<\/jats:sup>C distribution was included in Isodyn as a routine procedure. The advantage of this implementation is that, being a part of evaluation of metabolic fluxes, it does not require additional experiments to study metabolic compartmentation. The analysis of experimental data revealed that the distribution of measured <jats:sup>13<\/jats:sup>C-labeled glucose metabolites is inconsistent with the idea of perfect mixing of hexose phosphates in cytosol. In contrast, the observed distribution indicates the presence of a separate pool of hexose phosphates that is channeled towards glycogen synthesis.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1752-0509-5-175","type":"journal-article","created":{"date-parts":[[2012,2,29]],"date-time":"2012-02-29T17:28:24Z","timestamp":1330536504000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Compartmentation of glycogen metabolism revealed from 13C isotopologue distributions"],"prefix":"10.1186","volume":"5","author":[{"given":"Igor","family":"Marin de Mas","sequence":"first","affiliation":[]},{"given":"Vitaly A","family":"Selivanov","sequence":"additional","affiliation":[]},{"given":"Silvia","family":"Marin","sequence":"additional","affiliation":[]},{"given":"Josep","family":"Roca","sequence":"additional","affiliation":[]},{"given":"Matej","family":"Ore\u0161i\u010d","sequence":"additional","affiliation":[]},{"given":"Loranne","family":"Agius","sequence":"additional","affiliation":[]},{"given":"Marta","family":"Cascante","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2011,10,28]]},"reference":[{"key":"837_CR1","first-page":"R190","volume":"245","author":"CS Irving","year":"1983","unstructured":"Irving CS, Wong WW, Shulman RJ, Smith EO, Klein PD: [13C]bicarbonate kinetics in humans: intra- vs interindividual variations. 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