gbMSC cell surface marker profiles, as determined by fluorescence-activated cell sorting (FACS) analysis, were CD73+, CD90+, CD105+ (>95% of cells were positive for these markers) and CD14−, CD31−, CD34−, CD45− (<2% of cells were positive for these markers). Hence, G55 tumors probably rely greatly on the PPP for sustained rapid growth, while the preparatory phase of glycolysis may be less important. 6B). GS-11 and GS-12 cell lines were cultured as neurospheres, as described previously.9 Glioma cell lines G55 and U87, HuH7 (hepatocarcinoma), and MDA-MB231 (breast cancer) cells were cultured in Dulbecco's modified Eagle's medium (DMEM) with 10% fetal bovine serum (FBS; Life Technologies). , Vartanian A, Burrell Ket al. This work was supported by the Anni Hofmann Stiftung (KL, CHM, RG), the Deutsche Forschungsgemeinschaft (LA1300/4-1), the Forschungsförderungsfonds des Universitätsklinikums Hamburg-Eppendorf (AK), and the Rudolf Bartling Stiftung (KL). Animal experiments were approved by the local authority in Hamburg. In GS-11 cells, decreased migration achieved with ALDOC knockdown was accompanied by increased proliferation, and reduced proliferation of G6PD knockdown cells was accompanied by increased migration. 4B). NADPH: Nicotinamide adenine dinucleotide phosphate (NADP) carrying electrons and bonded with a hydrogen (H) ion; the reduced form of NADP+. Cellular respiration introduction. 6-AN reduced glioblastoma cell proliferation while stimulating migration, whereas 2-DG reduced both proliferation and migration, indicating that interference at the enzymatic branching point that supports both pathways affects both associated functional states. None declared. Western blot analysis was performed as detailed in the Supplementary material and as described previously.7 Western blot scans of x-ray films were quantified by densitometry using the ImageJ program. We had focused the analysis on enzyme isoforms described as most relevant in brain and/or cancer; despite a certain degree of tissue specificity, these isoforms are expressed virtually ubiquitously, which we confirmed by directly comparing mRNA levels between different cell types under normoxia (Supplementary material, Fig. Functional effects of 6-AN and 2-DG. GL , Verdone JE, Huang Jet al. Tumor cell proliferation (Ki-67) was increased in shALDOC_1 tumors. , Chen X, An J, Day BW, Pollack IF. Rapidly and slowly dividing or migrating glioblastoma cells were separated, and enzyme profiles were compared. Excessive proliferation and migration tend to be spatially and temporally disassociated behaviors, with cells either favoring proliferation at the expense of migration or migration at the expense of proliferation, a phenomenon conceptualized in the “go or grow” hypothesis.1, It has been shown that the balance between glioblastoma cell proliferation and invasion can be shifted by therapeutic intervention. . Glucose 6-phosphate for the production of NADPH (by the reduction of coenzyme NADP) and a Pentose sugar.. PPP enzyme expression was increased in rapidly dividing glioblastoma cells, whereas glycolysis enzymes were decreased. There are two distinct phases in the pathway: the oxidative phase and the non-oxidative phase. There is an alternative pathway for the conversion of glucose 6-phosphate to fructose 6-phosphate, the pentose phosphate pathway (sometimes known as the hexose monophosphate shunt), shown in Figure 5.14.. Two novel cell culture models of buccal mucosal oral cancer from patients with no risk-habits of tobacco smoking or chewing. The needs of the cell determine which metabolic pathway is taken. glucagon, epinephrine, cortisol The pentose phosphate pathway is a metabolic pathway that takes place parallel to glycolysis. 2A, Supplementary material, Fig. It has been shown that glycolytic enzymes are enriched in pseudopodia and that glycolytic energy rather than oxidative phosphorylation is the primary energy source for cancer cell motility and cytoskeletal rearrangement.22–24 Furthermore, lactate can stimulate tumor cell migration and invasion.25 Interestingly, several glycolytic enzymes exhibit additional noncanonical functions, some of which are related to migration. M . T The pentose phosphate pathway (PPP), also known as the phosphogluconate pathway or the hexose monophosphate shunt, is a metabolic pathway parallel to glycolysis, and represents the first committed step of glucose metabolism ( 6 ). NADPH is generated in the oxidative phase, while pentose sugars are generated through the non-oxidative phase. All experiments were performed at 21% O2. To determine whether glycolysis and the PPP are causatively involved in the dichotomous regulation of migration versus proliferation, we used enzyme inhibitors and shRNA. G6PD knockdown in a highly proliferative but noninvasive glioblastoma cell line resulted in prolonged survival of mice with intracerebral xenografts, whereas ALDOC knockdown shortened survival. Published by Oxford University Press on behalf of the Society for Neuro-Oncology. KC For full access to this pdf, sign in to an existing account, or purchase an annual subscription. 1B, Supplementary material, Fig. Sort by: Top Voted. Conversely, glycolysis enzymes were elevated in migrating cells, whereas PPP enzymes were diminished. Pentose phosphate pathway Overview. Cellular respiration introduction. A K , Ulbricht U, Bohlen Pet al. K After 6 hours (G55) or 28 hours (GS-11) of incubation, nonmigrated cells from the upper side of the transwell membrane, as well as migrated cells from the underside, were scraped off and collected separately. 4. FIGURE 14-27 Role of NADPH in regulating the partitioning of glucose 6-phosphate between glycolysis and the pentose phosphate pathway. Proliferation of GS-11 shALDOC cells was increased up to 3.7-fold (shALDOC_1) compared with shControls, but G55 proliferation was not affected by ALDOC knockdown. So it is a shunt of glycolysis. University Medical Center Hamburg-Eppendorf, Division of Experimental Neurosurgery, Department of Neurosurgery, Klinikum Grosshadern, Ludwigs-Maximilians-University. G6PD knockdown resulted in reduced glioblastoma cell proliferation, whereas knockdown of ALDOC decreased cell migration. . Conversely, glycolysis enzymes were elevated in rapidly migrating cells while PPP enzymes were diminished, indicating that coupling between functional and metabolic states is independent of changes in oxygen tension and that the metabolic state is intrinsically linked to the dichotomous activation of go or grow cellular programs. Agnihotri Carbohydrate metabolism questions. In the GS-11 model, no significant differences in total tumor burden were detected between ALDOC or G6PD knockdown tumors and controls, although proliferation was slightly increased in shALDOC tumors and decreased in shG6PD tumors. Asterisks in (A)-(D) indicate significance (P < .05); size bars are 50 µm. • It is a shunt of glycolysis • It is also known as hexose monophosphate (HMP) shunt or phosphogluconate pathway. Animals were killed using CO2, brains were fixed in formalin and embedded in paraffin, and serial sections were stained with H&E. 2. Immunostaining of paraffin sections for Ki-67 was performed as described previously using a mouse monoclonal antibody (Dako,) and the Histofine detection system (Medac).13 The percentage of Ki-67 immunoreactive nuclei was determined in 3 high-power fields in the most actively proliferating tumor area. G6PD expression and proliferation of knockdown tumors was decreased compared with controls. , Stracke ML, Liotta LA, Schiffmann E. Shiraishi U Excessive proliferation and migration tend to be spatially and temporally disassociated behaviors, with cells either favoring proliferation at the expense of migration or migration at the expense of proliferation, a phenomenon conceptualized in the “go or grow” hypothesis.1 It has been shown that the balance between glioblasto… 5B). , Bottoni P, Pontoglio A, Mastrototaro L, Giardina B. Semenza Enzyme expression, migration, and proliferation under hypoxia were studied in multiple cell types. Glioblastoma cell lines grown under adherent conditions (U87, G55), cell lines derived from other tumor entities (HuH7, MDA-MB-231), and non-transformed cells such as normal human astrocytes, fibroblasts, umbilical vein endothelial cells, glioblastoma-associated mesenchymal stem cells (MSCs), and peripheral blood mononuclear cells were included. , Oliva CR, Gobin Eet al. On cross sections, perivascular invasion typically appeared as micronodular or finger-like structures. T The pentose phosphate pathway (PPP; also called the phosphogluconate pathway and the hexose monophosphate shunt) is a process that breaks down glucose-6-phosphate into NADPH and pentoses (5-carbon sugars) for use in downstream biological processes. Glioblastomas typically consist of a tumor core containing highly proliferative cells and a diffusely invasive periphery with tumor cells that exhibit only low proliferation rates. (A) Under normoxic conditions, pentose phosphate pathway (PPP) enzyme expression and flux are upregulated to facilitate biomass production and cell cycling (blue arrows). CE https://youtu.be/30bRJwBqykw~*~Hey! Giese So it is a shunt of glycolysis, Difference between batch, fed-batch and continuous culture technique, Naveed ali biotecnologest S3B). After 3 days of hypoxic incubation, proliferation of all cell types was significantly decreased compared with normoxic controls (Fig. 37 Full PDFs related to this paper. In addition, diffusely infiltrative tumor growth was quantified by measuring the net area occupied by tumor cell nuclei in 20 representative regions using a previously developed method.9,13,14 Neither the analysis of micronodular tumor growth nor quantification of diffusely invasive growth revealed a significant difference between shALDOC_1 and shControl tumors (Fig. . Knockdown of G6PD resulted in decreased cell proliferation. Efficient downregulation of ALDOC mRNA and protein was achieved by transduction with 3 different shRNAs in GS-11 and G55 cells (Fig. . A short summary of this paper. qPCR and immunoblot analysis revealed downregulation of glycolysis enzymes in fast dividing (F) versus slowly dividing (S) cells, paralleled by upregulation of PPP enzymes. Chromobox 4 facilitates tumorigenesis of lung adenocarcinoma through the Wnt/β-catenin pathway. However, some mutations that disrupt the plastidial oxidative pentose phosphate pathway (OPPP) cause developmental defects, as well as embryo arrest at the globular stage of development. Conversely, cell migration was found to be invariably enhanced by incubation under hypoxia for 5 hours in modified Boyden chamber assays (Fig. The pentose phosphate pathway is an alternative path for the oxidation of glucose. (A) Fast and slowly dividing cell subpopulations were isolated by fluorescence-activated cell sorting (FACS) from PKH67-labelled cells (slowly: 8.9%, fast: 9.4% of all cells). Citric … While HMP shunt is the breakdown of glucose to yield different metabolic intermediates. Migration of GS-11 cells was decreased maximally by 70.5% (shALDOC_3), and G55 cell migration was reduced by up to 48.3% (shALDOC_1) compared with nonsilencing controls (shControl), (P < .05). S3A). In most organisms, glycolysis occurs in the cytosol. M . Finally, we explored whether glycolysis and the PPP are directly and causatively involved in the dichotomous regulation of migration versus proliferation. Effects of ALDOC knockdown (C) and G6PD knockdown (D) on cell migration and proliferation were analyzed as described in Fig. The pentose phosphate pathway, also called the phosphogluconate pathway, is a Up Next. Values are means ± SD of quadruplicate determinations. Tumor cell proliferation was decreased by 18.1% in shG6PD_2 tumors compared with shControls (Fig. Enzyme inhibitors had similar effects. Upregulation and downregulation of glycolysis and PPP enzymes in response to hypoxia were not generally stronger in tumor cells, indicating that normal cells share a comparable capacity of adaptation to fluctuating microenvironmental challenges. , Beas AO, Bornheimer SJet al. Conflict of interest statement. ME Ghosh While the pentose phosphate pathway does involve oxidation of glucose, its primary role is anabolic rather than catabolic. In the present study, we investigated whether the hypoxia-induced reciprocal switch between PPP and glycolysis enzyme expression is restricted to stem-like glioblastoma cells or if it also occurs in other cell types. NADPH is required for and consumed during fatty acid synthesis and the scavenging of … Zamykal GS cell proliferation was analyzed by cell counting after 7 days of incubation, and G55 proliferation was determined after 4 days using a colorimetric assay. A Lentiviral transduction of short hairpin RNA (shRNA) targeting aldolase C (ALDOC), glucose-6-phosphate dehydrogenase (G6PD) or nonsilencing control shRNA was performed as outlined in the Supplementary material. Antiangiogenic treatment can inhibit glioblastoma growth in orthotopic xenograft models and reduce tumor cell proliferation; however, treated tumors typically display a striking compensatory increase in invasion.2,3 Inhibition of angiogenesis impairs intratumoral oxygen supply, and hypoxia is a potent driver of glioblastoma cell migration and invasion.4 Hypoxia can further enhance stem cell characteristics of glioblastoma cells, and cyclic fluctuations in oxygen tension, which occur during tumor progression, select for stem-like glioblastoma cells which possess outstanding metabolic adaptability.5,6 While investigating mechanisms of adaptation of glioblastoma stem-like (GS) cells to bidirectional fluctuations in oxygen tension, we recently discovered a reciprocal metabolic switch between the pentose phosphate pathway (PPP) and glycolysis.7 The PPP, which produces ribose-5-phosphate and NADPH for DNA/RNA and fatty acid synthesis, is an alternative anabolic pathway to the preparatory phase of glycolysis.8 Enzymes of the PPP are highly expressed under normoxic conditions, whereas acute hypoxia causes downregulation of PPP enzymes concomitant with upregulation of glycolysis enzymes. Description: The pentose phosphate pathway consists of a group of reactions in which G6P is degraded, leading to NADPH and ribose 5-phosphate formation. It also metabolizes dietary pentoses and provides glycolytic/gluconeogenic intermediates. Beckner G6PD and ALDOC emerged as the most strongly inversely hypoxia-regulated enzymes of both pathways. The difference is that glycolysis is the breakdown of glucose up to pyruvate or lactate. Type 2 diabetes subgroups and potential medication strategies in relation to effects on insulin resistance and beta-cell function: a step towards personalized diabetes treatment? (B) Quantification of G6PD in cells transduced with shRNAs targeting G6PD or nonsilencing shRNA. Goetze The pentose phosphate pathway is an alternative to glycolysis and generates NADPH (oxidative phase) and pentoses (5-carbon sugars, nonoxidative phase). In a highly invasive glioblastoma xenograft model, tumor burden was unchanged by either knockdown. 6A). Differences in gene expression and in functional assays were analyzed using the unpaired t test and the SigmaStat 2.0 program. , Schmidt NO, Eckerich Cet al. For example, glucose 6-phosphate isomerase (GPI) is identical to the secreted cytokine autocrine motility factor (AMF) which binds to a cell surface receptor, AMFR, and stimulates migration in an autocrine and paracrine fashion.26 The multifaceted “moonlighting” functions of glycolysis enzymes are only partly elucidated, and further work is necessary to better characterize their involvement in cancer cell function. In conclusion, our findings indicate that inhibition of G6PD and the PPP could be a useful strategy for targeting highly proliferative tumor cells in glioblastoma. Cells were labeled with PKH67, a fluorescent membrane-intercalating dye. shRNA-expressing cells were selected using puromycin. Glioblastomas typically consist of a tumor core containing highly proliferative cells and a diffusely invasive periphery with tumor cells that exhibit only low proliferation rates. 6D). It consists of two distinct pathways as oxidative pentose phosphate pathway and nonoxidative pentose phosphate pathway. 4B). After 5 hours or 24 hours (GS-11 cells) of incubation, migrated cells on the underside of the membrane were stained and counted. Fack Scatena We investigated whether the 2 parallel glucose metabolic pathways are intrinsically linked with cell function and whether these pathways are mechanistically involved in regulating functional programs. Furthermore, migration of all cell lines was also inhibited by 2-DG, and the effects became significant at 0.5 or 1.0 µM (Fig. **Atttention** I have a new step-by-step glycolysis video. Densitometric analysis is presented in Supplementary material, Fig. , Martens T, Matschke Jet al. The relation between staging fluorine-18 fluorodeoxyglucose positron emission tomography/computed tomography metabolic parameters and tumor necrosis rate in pediatric osteosarcoma patients. . Transwell Permeable Supports (Corning Incorporated) were coated with laminin (5 µg/mL) or collagen (0.875%) for GS-11 or G55 cells, respectively, and were installed in 6-well plates. , Espedal H, Keunen Oet al. S2). Considering the opposite in vitro effects of ALDOC and G6PD knockdown on migration and proliferation, the impairment of either function alone is obviously not sufficient to affect the invasive tumor growth of GS-11 cells in vivo. SD The first is the oxidative phase, in which NADPH is generated, and the second is the non- Martens Human astrocytes were maintained in astrocyte medium (Life Technologies) with 20% FBS. 1C). glucose-6-phosphate … Quantification of invasive growth in the GS-11 model was performed as described previously9,13,14 and as detailed in the Supplementary material. qPCR and immunoblot analysis revealed that PKHlow cells displayed decreased expression of almost all glycolysis enzymes and of LDHA compared with PKHhigh cells but increased expression of PPP enzymes, including its first and key regulatory enzyme G6PD (Fig. The pathway is especially important in red blood cells. . This is supported by the finding that the Ki-67 rate was reduced in shG6PD tumors but increased in shALDOC tumors. It also oxidize glucose to CO2 and water. When NADPH is forming faster than it is being used for biosynthesis and glutathione reduction (see Figure 14-20), [NADPH] rises and inhibits the first enzyme in the pentose phosphate pathway. Cell function and metabolic state are coupled independently of hypoxia, and glucose metabolic pathways are causatively involved in regulating “go or grow” cellular programs. Time points for FACS-separation of fast dividing (PKHlow) and slowly dividing (PKHhigh) subpopulations were optimized for each line to maximize differences in fluorescence intensity as well as population size for further analyses and were 2 days for G55 cells and 14 days for GS-11 cells. J The pentose phosphate pathway is a metabolic pathway parallel to glycolysis. The Pentose Phosphate Pathway also allows the entry of some carbohydrates into the glycolytic pathway (especially ribose, but also some others), and therefore acts as a connection route between different pathways. MG Biochemistry, Microbiology (B) Diffuse tumor burden in mice engrafted with GS-11-shALDOC_1 cells was assessed by analyzing 20 landmark areas (at 4 coronal levels [L1-L4] in 5 defined regions each). 1.What is the primary difference between the oxidation of glucose to CO2 by glycolysis and the citric acid cycle vs pentose phosphate pathway? The enzymes analyzed represent the key components of the different glucose pathways, which showed strongest hypoxic induction in GS cells7 and included hexokinase 2 (HK2), 6-phosphofructokinase platelet type (PFKP), ALDOC, (all preparatory phase of glycolysis), pyruvate kinase M2 (PKM2), (pay-off phase of glycolysis), lactate dehydrogenase A (LDHA), (lactate production), glucose-6-phosphate dehydrogenase (G6PD), 6-phosphogluconate dehydrogenase (PGD), (both oxidative part of the PPP), and transketolase (TKT), (nonoxidative part of the PPP). • Pentose phosphate pathway is an alternative pathway to glycolysis and TCA cycle for oxidation of glucose. 3A and B). Phillips HSet al ATP as an energy source knocked down its expression using shRNA new step-by-step glycolysis video oxidative. Limited to GS cells ) or 2-deoxyglucose ( 2-DG ) were added to upper. Incubation under hypoxia were studied in multiple cell types reduced glioblastoma cell migration and under. 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