A series of 27 salicylanilide-based carbamates was prepared as a part of our ongoing search for new antituberculosis drugs. These compounds exhibited very good in vitro activity against Mycobacterium tuberculosis, Mycobacterium kansasii and Mycobacterium avium and, in particular, against five multidrug-resistant strains, with MIC values between 0.5-2 micromol/L. Moreover, they displayed moderate toxicity against intestinal cells with the selectivity index being up to 96. Furthermore, acid stability and a half-life of 43h at pH 7.4 were shown. Thus, these novel salicylanilide derivatives are drug candidates which should be seriously consider for further screening.
- MeSH
- antituberkulotika chemie farmakologie MeSH
- buněčné linie MeSH
- karbamáty chemie farmakologie MeSH
- lidé MeSH
- Mycobacterium tuberculosis účinky léků MeSH
- proliferace buněk účinky léků MeSH
- salicylanilidy chemie farmakologie MeSH
- tuberkulóza farmakoterapie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
A new series of 30 N-protected amino acid esters were prepared as a part of ongoing search for new anti-tuberculosis active salicylanilides. The esters possess high in vitro activity against Mycobacterium tuberculosis, Mycobacterium avium, and two strains of Mycobacterium kansasii, where one is an isolate from the patient, with MIC in the range 1-32 micromol/L for all tested strains. The prepared esters can be considered as prodrugs with better bio-availability and as more efficient transport forms through the mycobacterial cell membranes due to the higher lipophilicity. The experimental and calculated lipophilicity, stability, antituberculotic activity, cytotoxicity as well as the quantitative structure-activity relationships (QSARs) explored by the Intelligent Problem Solver (IPS) in Trajan Neural Network Simulator 6.0 are presented.
The retention behavior of the unmodified phosphodiester oligonucleotide sequence isomers was investigated on two different anion exchange columns: Biospher GMB 1000Q (based on DEAE-modified glycidyl methacrylate) and PolyWAX LP (based on silica with a crosslinked coating of linear polyethyleneimine). There was a notable difference in retention of oligonucleotides of the same composition but differing in the position of a single base. The most pronounced difference was observed between the oligonucleotides with the variable base in the end and in the center of the sequence. The use of either acetonitrile or 2-propanol as a mobile phase organic modifier did not markedly affect the retention time patterns. Prediction of the retention times of oligonucleotides must take into account the base position as well as identity. This is the first report of such a "same composition different sequence" effect, described for the short peptides, for synthetic oligonucleotides.
