Synthesis, cytotoxic and combined cDDP activity of new stable curcumin derivatives.

New curcumin derivatives are synthesized in order to improve chemical properties of curcumin. The aromatic ring glycosylation of curcumin provides more water-soluble compounds with a greater kinetic stability which is a fundamental feature for drug bioavailability. The glycosylation reaction is quite simple, low cost, with high yield and minimum waste. NMR data show that the ability of curcumin to coordinate metal ion, in particular Ga(III), is maintained in the synthesized products. Although the binding of glucose to curcumin reduces the cytotoxicity of the derivatives towards cisplatin (cDDP)-sensitive and -resistant human ovarian carcinoma cell lines, the compounds display a good selectivity since they are much less toxic against non-tumourigenic Vero cells. The combination of cDDP with the most active glycosyl-curcuminoid drug against both cDDP-sensitive and -resistant as well as against Vero cell lines is tested. The results show an improvement of cDDP efficacy with higher selectivity towards cancer cells than non-cancer cells. These studies indicate the need for developing new valid components of drug treatment protocols to cDDP-resistant cells as well.

Synthesis and characterization of glucosyl-curcuminoids as Fe3+ suppliers in the treatment of iron deficiency.

The Fe(3+) chelating ability of some curcumin glucosyl derivatives (Glc-H; Glc-OH; Glc-OCH(3)) is tested by means of UV and NMR study. The pK(a) values of the ligands and the overall stability constants of Fe(3+) and Ga(3+) complexes are evaluated from UV spectra. The only metal binding site of the ligand is the beta-diketo moiety in the keto-enolic form; the glucosyl moiety does not interact with metal ion but it contributes to the stability of metal/ligand 1:2 complexes by means of hydrophilic interactions. These glucosyl derivatives are able to bind Fe(3+) in a wide pH rage, forming complex species thermodynamically more stable than those of other ligands commonly used in the treatment of iron deficiency. In addition they demonstrate to have a poor affinity for competitive biological metal ions such as Ca(2+). All ligands and their iron complexes have a good lypophilicity (log P > -0.7) suggesting an efficient gastrointestinal absorption in view of their possible use as iron supplements in oral therapy. The ligand molecules are also tested for their antioxidant properties in "ex vivo" biological system.

New synthetic glucosyl-curcuminoids, and their (1)H and (13)C NMR characterization, from Curcuma longa L.

Turmeric extracts, among which curcumin and bis-demethoxycurcumin, are by far known for their therapeutic activities. In this study we propose easy and low cost synthetic pathways in order to obtain glucosyl-curcuminoids, safe and water soluble potential drugs and dyes, which may be implied in different fields ranging from pharmacology to food chemistry. The complete (1)H and (13)C NMR characterization of naturally occurring curcumin, bis-demethoxycurcumin and new synthetic glucosyl-curcuminoids is reported.

Synthesis, chemical and biological studies on new Fe(3+)-glycosilated beta-diketo complexes for the treatment of iron deficiency.

A simple synthetic pathway to obtain glycosilated beta-diketo derivatives is proposed. These compounds show a good iron(III) affinity therefore we may suggest the use of their Fe(3+)-complexes as oral iron supplements in the treatment of anaemia. The glycosilated compounds (6-GlcH, 6-GlcOH and 6-GlcOCH(3)) are characterized by means of spectroscopic (UV, (1)H and (13)C NMR) and potentiometric techniques; they have a good water solubility, are kinetically stable in physiological condition (t(1/2)>100h) and show a low cytotoxicity also in high concentrations (IC(50)>400 microM). They are able to bind Fe(3+) ion in acid condition (pH approximately 2) forming complex species thermodynamically more stable than those of other ligands commonly used in the treatment of iron deficiency. The iron complexes show also a good kinetic stability both in acidic and physiological pH and have a good lypophilicity (logP>-0.7) that suggests an efficient gastrointestinal absorption in view of their possible use in oral therapy. In addition they demonstrate a poor affinity for competitive biological metal ion such as Ca(2+), and in particular 6-GlcOCH(3) is able to inhibit lipid peroxidation.

Genomic characterization of Italian Clostridium botulinum group I strains.

Clostridium botulinum is a gram-positive bacterium capable of producing the botulinum neurotoxin, a powerful poison that causes botulism, a severe neuroparalytic disease. Its genome has been sequenced entirely and its gene content has been analyzed. To date, 19 full genomes and 64 draft genomes are available. The geographical origin of these genomes is predominantly from the US. In the present study, 10 Italian genomes of C. botulinum group I were analyzed and compared with previously sequenced group I genomes, in order to genetically characterize the Italian population of C. botulinum group I and to investigate the phylogenetic relationships among different lineages. Using the suites of software ClonalFrame and ClonalOrigin to perform genomic analysis, we demonstrated that Italian C. botulinum group I population is phylogenetically heterogeneous encompassing different and distant lineages including overseas strains, too. Moreover, a high recombination rate was demonstrated in the evolution of C. botulinum group I species. Finally, genome sequencing of the strain 357 led us to identify a novel botulinum neurotoxin subtype, F8.

Draft Genome Sequence of Clostridium botulinum B2 450 Strain from Wound Botulism in a Drug User in Italy.

Here, we report the draft genome sequence of Clostridium botulinum B2 450, responsible for the first reported case of wound botulism in a drug user in Italy.

Whole-Genome Sequence of Clostridium botulinum A2B3 87, a Highly Virulent Strain Involved in a Fatal Case of Foodborne Botulism in Italy.

Here, we report the genome sequence of a rare bivalent strain of Clostridium botulinum, A2B3 87. The strain was isolated from a foodborne botulism case that occurred in Italy in 1995. The case was characterized by rapid evolution of the illness and failure of conventional treatments.