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Altered glucose metabolism and proteolysis in pancreatic cancer cell conditioned myoblasts: searching for a gene expression pattern with a microarray analysis of 5000 skeletal muscle genes
  1. D Basso1,
  2. C Millino2,
  3. E Greco1,
  4. C Romualdi2,
  5. P Fogar3,
  6. A Valerio4,
  7. M Bellin2,
  8. C-F Zambon3,
  9. F Navaglia1,
  10. N Dussini5,
  11. A Avogaro4,
  12. S Pedrazzoli3,
  13. G Lanfranchi2,
  14. M Plebani1
  1. 1Department of Laboratory Medicine, University of Padova, Padova, Italy
  2. 2CRIBI Biotechnology Centre, University of Padova, Padova, Italy
  3. 3Department of Medical and Surgical Sciences, University of Padova, Padova, Italy
  4. 4Department of Clinical and Experimental Medicine, University of Padova, Padova, Italy
  5. 5Department of Paediatrics, University of Padova, Padova, Italy
  1. Correspondence to:
    Dr M Plebani
    Department of Laboratory Medicine, University-Hospital, Via Giustiniani 2, 35128 Padova, Italy;


Background and aims: We verified whether conditioned media (CM) from pancreatic cancer cell lines (MIAPaCa2, CAPAN-1, PANC-1, BxPC3) alter glucose metabolism and gene expression profiles (microarray experiment with a platform of 5000 skeletal muscle cDNA) in mice myoblasts.

Methods: Myoblasts were incubated with control or pancreatic cancer CM for 24 and 48 hours.

Results: Lactate significantly increased in CM compared with non-conditioned myoblasts. No variations in expression levels of the main genes involved in glycolysis were found in CM myoblasts. Propionyl coenzyme A carboxylase and isocitrate dehydrogenase 3 beta genes, which encode enzymes of the tricarboxylic acid cycle, were overexpressed, while IGFIIR and VAMP5 genes were underexpressed in CM myoblasts. PAFAH1B1 and BCL-2 genes (intracellular signal transduction) and the serine protease cathepsin G (proteolysis), were overexpressed in CM myoblasts. Tyrosine accumulation in CM myoblasts suggested that proteolysis overcomes protein synthesis. Sorcin, actin alpha, troponin T1, and filamin A were underexpressed in CM myoblasts.

Conclusions: Our findings demonstrate that pancreatic cancer cell conditioned media enhanced lactate production and induced proteolysis, possibly by altering expression levels of a large number of genes, not only those involved in protein biosynthesis and degradation or glucose metabolism, but also those involved in the tricarboxylic acid cycle and in vesicle traffic.

  • CM, conditioned media
  • DMEM, Dulbecco’s modified Eagle’s medium
  • FCS, fetal calf serum
  • PBS, phosphate buffered saline
  • NCM, non-conditioned medium
  • TC, tumour conditioned
  • MW, molecular weight
  • RT-PCR, reverse transcription-polymerase chain reaction
  • ECHS1, enoyl coenzyme A hydratase
  • IGF2R, insulin-like growth factor 2 receptor
  • VAMP5, vesicle associated membrane protein 5
  • FLNA, filamin A
  • PCCB, propionyl coenzyme A carboxylase
  • RPS16, ribosomal protein S16
  • cachexia
  • diabetes mellitus
  • micoarray
  • myoblasts
  • pancreatic cancer

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