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Changes in physico-chemical properties of human large intestine tumour cells membrane

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Abstract

Tumour cells produce and excrete to blood many substances which are present in the cell itself in trace amounts only. Our work has been aimed at the determination of changes in electric charge and in phospholipid composition of large intestine normal mucosa and colorectal cancer cells.

Surface charge density of tumour unaffected mucosa and of tissue sections from tumours, was measured by electrophoresis. The measurements were carried out at various pH of solution. Membrane isoelectric point was determined by measuring its electric charge in function of pH as well as total positive charge at low pH and total negative charge at high pH. Qualitative and quantitative composition of phospholipids in the membrane was determined by HPLC. Four phospholipid classes were identified: PI, PS, PE and PC and their surface concentrations were determined.

The electric charge calculated from phospholipid concentrations is by three orders of magnitude higher than that determined electrophoretically. It indicates that the groups present in the membrane surface are involved in equilibria in which the charge is neutralized.

The electric charge calculated from phospholipid concentrations is by three orders of magnitude higher than that determined electrophoretically. It indicates that the groups present in the membrane surface are involved in equilibria in which the charge is neutralized.

Tumour changes provoke an increase in surface charge density of large intestine membrane, whereas the content of individual phospholipids increased or decreased depending on a patient.

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Authors and Affiliations

  1. Institute of Chemistry, University of Białystok, Al. Piłsudskiego 11/4, 15-443, Białystok, Poland

    Barbara Szachowicz-Petelska, Izabela Dobrzyńska & Zbigniew Figaszewski

  2. Laboratory of Interfacial Electrochemistry, Faculty of Chemistry, University of Warsaw, Warsaw, Poland

    Zbigniew Figaszewski

  3. Department of Clinical Pathomorphology, Medical Academy of Białytok, ul. Wasztngtona 13, 15-269, Białystok, Poland

    Stanisław Sulkowski

Authors
  1. Barbara Szachowicz-Petelska
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  2. Izabela Dobrzyńska
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  3. Zbigniew Figaszewski
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  4. Stanisław Sulkowski
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Szachowicz-Petelska, B., Dobrzyńska, I., Figaszewski, Z. et al. Changes in physico-chemical properties of human large intestine tumour cells membrane. Mol Cell Biochem 238, 41–47 (2002). https://doi.org/10.1023/A:1019946718876

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