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Carbohydr Polym. 2016 Feb 10;137:39-51. doi: 10.1016/j.carbpol.2015.10.055. Epub 2015 Oct 19.

Identification of a cytotoxic molecule in heat-modified citrus pectin.

Author information

1
Laboratory of Biochemistry and Cellular Biology-URBC, NARILIS, University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: lionel.leclere@slbo.be.
2
Laboratory of Biochemistry and Cellular Biology-URBC, NARILIS, University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: maude.fransolet@unamur.be.
3
Laboratory of Plant Cellular Biology-URBV, University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: pierre.cambiuer@unamur.be.
4
Organic Chemistry Research Unit (UCO), University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: sandy.elbkassiny@unamur.be.
5
Organic Chemistry Research Unit (UCO), University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: abdellatif.tikad@unamur.be.
6
Laboratory of Biochemistry and Cellular Biology-URBC, NARILIS, University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: marc.dieu@unamur.be.
7
Organic Chemistry Research Unit (UCO), University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: stephane.vincent@unamur.be.
8
Laboratory of Plant Cellular Biology-URBV, University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: pierre.vancutsem@unamur.be.
9
Laboratory of Biochemistry and Cellular Biology-URBC, NARILIS, University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium. Electronic address: carine.michiels@unamur.be.

Abstract

Modified forms of citrus pectin possess anticancer properties. However, their mechanism of action and the structural features involved remain unclear. Here, we showed that citrus pectin modified by heat treatment displayed cytotoxic effects in cancer cells. A fractionation approach was used aiming to identify active molecules. Dialysis and ethanol precipitation followed by HPLC analysis evidenced that most of the activity was related to molecules with molecular weight corresponding to low degree of polymerization oligogalacturonic acid. Heat-treatment of galacturonic acid also generated cytotoxic molecules. Furthermore, heat-modified galacturonic acid and heat-fragmented pectin contained the same molecule that induced cell death when isolated by HPLC separation. Mass spectrometry analyses revealed that 4,5-dihydroxy-2-cyclopenten-1-one was one cytotoxic molecule present in heat-treated pectin. Finally, we synthesized the enantiopure (4R,5R)-4,5-dihydroxy-2-cyclopenten-1-one and demonstrated that this molecule was cytotoxic and induced a similar pattern of apoptotic-like features than heat-modified pectin.

KEYWORDS:

4,5-Dihydroxy-2-cyclopenten-1-one; Cancer; Cytotoxic activity; Fragmented pectin

PMID:
26686103
DOI:
10.1016/j.carbpol.2015.10.055
[Indexed for MEDLINE]

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