Compounds with a phosphonate group, i.e., -P(O)(OH)2 group attached directly to the molecule via a P-C bond serve as suitable non-hydrolyzable phosphate mimics in various biomedical applications. In principle, they often inhibit enzymes utilizing various phosphates as substrates. In this review we focus mainly on biologically active phosphonates that originated from our institute (Institute of Organic Chemistry and Biochemistry in Prague); i.e., acyclic nucleoside phosphonates (ANPs, e.g., adefovir, tenofovir, and cidofovir) and derivatives of non-nucleoside phosphonates such as 2-(phosphonomethyl) pentanedioic acid (2-PMPA). Principal strategies of their syntheses and modifications to prodrugs is reported. Besides clinically used ANP antivirals, a special attention is paid to new biologically active molecules with respect to emerging infections and arising resistance of many pathogens against standard treatments. These new structures include 2,4-diamino-6-[2-(phosphonomethoxy)ethoxy]pyrimidines or so-called "open-ring" derivatives, acyclic nucleoside phosphonates with 5-azacytosine as a base moiety, side-chain fluorinated ANPs, aza/deazapurine ANPs. When transformed into an appropriate prodrug by derivatizing their charged functionalities, all these compounds show promising potential to become drug candidates for the treatment of viral infections. ANP prodrugs with suitable pharmacokinetics include amino acid phosphoramidates, pivaloyloxymethyl (POM) and isopropoxycarbonyloxymethyl (POC) esters, alkyl and alkoxyalkyl esters, salicylic esters, (methyl-2-oxo-1,3-dioxol-4-yl) methyl (ODOL) esters and peptidomimetic prodrugs. We also focus on the story of cytostatics related to 9-[2-(phosphonomethoxy)ethyl]guanine and its prodrugs which eventually led to development of the veterinary drug rabacfosadine. Various new ANP structures are also currently investigated as antiparasitics, especially antimalarial agents e.g., guanine and hypoxanthine derivatives with 2-(phosphonoethoxy)ethyl moiety, their thia-analogues and N-branched derivatives. In addition to ANPs and their analogs, we also describe prodrugs of 2-(phosphonomethyl)pentanedioic acid (2-PMPA), a potent inhibitor of the enzyme glutamate carboxypeptidase II (GCPII), also known as prostate-specific membrane antigen (PSMA). Glutamate carboxypeptidase II inhibitors, including 2-PMPA have been found efficacious in various preclinical models of neurological disorders which are caused by glutamatergic excitotoxicity. Unfortunately its highly polar character and hence low bioavailability severely limits its potential for clinical use. To overcome this problem, various prodrug strategies have been used to mask carboxylates and/or phosphonate functionalities with pivaloyloxymethyl, POC, ODOL and alkyl esters. Chemistry and biological characterization led to identification of prodrugs with 44-80 fold greater oral bioavailability (tetra-ODOL-2-PMPA).

• Klíčová slova
• 2-PMPA, FOLH1, GCPII, acyclic nucleoside phosphonates, antivirals, prodrugs, prostate-specific membrane antigen, protides,
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH

A series of 13 acyclic nucleoside phosphonates (ANPs) as bisamidate prodrugs was prepared. Five compounds were found to be non-cytotoxic and selective inhibitors of Bordetella pertussis adenylate cyclase toxin (ACT) in J774A.1 macrophage cell-based assays. The 8-aza-7-deazapurine derivative of adefovir (PMEA) was found to be the most potent ACT inhibitor in the series (IC50 =16 nm) with substantial selectivity over mammalian adenylate cyclases (mACs). AC inhibitory properties of the most potent analogues were confirmed by direct evaluation of the corresponding phosphonodiphosphates in cell-free assays and were found to be potent inhibitors of both ACT and edema factor (EF) from Bacillus anthracis (IC50 values ranging from 0.5 to 21 nm). Moreover, 7-halo-7-deazapurine analogues of PMEA were discovered to be potent and selective mammalian AC1 inhibitors (no inhibition of AC2 and AC5) with IC50 values ranging from 4.1 to 5.6 μm in HEK293 cell-based assays.

• Klíčová slova
• Bacillus anthracis, Bordetella pertussis, adefovir, adenylate cyclase, inhibitors,
• MeSH
• adenin analogy a deriváty   chemická syntéza   chemie   farmakologie   MeSH
• adenylátcyklasy metabolismus   MeSH
• Bacillus anthracis enzymologie   MeSH
• Bordetella pertussis enzymologie   MeSH
• inhibitory enzymů chemická syntéza   chemie   farmakologie   MeSH
• molekulární struktura MeSH
• organofosfonáty chemická syntéza   chemie   farmakologie   MeSH
• vztah mezi dávkou a účinkem léčiva MeSH
• vztahy mezi strukturou a aktivitou MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Research Support, N.I.H., Extramural MeSH
• Názvy látek
• adefovir MeSH Prohlížeč
• adenin MeSH
• adenylátcyklasy MeSH
• inhibitory enzymů MeSH
• organofosfonáty MeSH

7-Deazapurine (pyrrolo[2,3-d]pyrimidine) nucleosides are important analogues of biogenic purine nucleosides with diverse biological activities. Replacement of the N7 atom with a carbon atom makes the five-membered ring more electron rich and brings a possibility of attaching additional substituents at the C7 position. This often leads to derivatives with increased base-pairing in DNA or RNA or better binding to enzymes. Several types of 7-deazapurine nucleosides with potent cytostatic or cytotoxic effects have been identified. The most promising are 7-hetaryl-7-deazaadenosines, which are activated in cancer cells by phosphorylation and get incorporated both to RNA (causing inhibition of proteosynthesis) and to DNA (causing DNA damage). Mechanism of action of other types of cytostatic nucleosides, 6-hetaryl-7-deazapurine and thieno-fused deazapurine ribonucleosides, is not yet known. Many 7-deazaadenosine derivatives are potent inhibitors of adenosine kinases. Many types of sugar-modified derivatives of 7-deazapurine nucleosides are also strong antivirals. Most important are 2'-C-methylribo- or 2'-C-methyl-2'-fluororibonucleosides with anti-HCV activities (several compounds underwent clinical trials). Some underexplored areas of potential interest are also outlined.

• Klíčová slova
• antivirals, cytostatics, deazapurines, nucleosides, nucleotides,
• MeSH
• antivirové látky chemická syntéza   chemie   farmakologie   MeSH
• buňky A549 MeSH
• buňky Hep G2 MeSH
• HeLa buňky MeSH
• lidé MeSH
• nukleosidy chemická syntéza   chemie   farmakologie   MeSH
• protinádorové látky chemická syntéza   chemie   farmakologie   MeSH
• puriny chemie   MeSH
• racionální návrh léčiv MeSH
• screeningové testy protinádorových léčiv MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• přehledy MeSH
• Názvy látek
• 7-deazapurine MeSH Prohlížeč
• antivirové látky MeSH
• nukleosidy MeSH
• protinádorové látky MeSH
• puriny MeSH

New 2,4-diamino-6-[2-(phosphonomethoxy)ethoxy]pyrimidine (PMEO-DAPy) and 1-[2-(phosphonomethoxy)ethyl]-5-azacytosine (PME-5-azaC) prodrugs were prepared with a pro-moiety consisting of carbonyloxymethyl esters (POM, POC), alkoxyalkyl esters, amino acid phosphoramidates and/or tyrosine. The activity of the prodrugs was evaluated in vitro against different virus families. None of the synthesized prodrugs demonstrated activity against RNA viruses but some of them proved active against herpesviruses [including herpes simplex virus (HSV), varicella-zoster virus (VZV), and human cytomegalovirus (HCMV)]. The bis(POC) and the bis(amino acid) phosphoramidate prodrugs of PMEO-DAPy inhibited herpesvirus replication at lower doses than the parent compound although the selectivity against HSV and VZV was only slightly improved compared to PMEO-DAPy. The mono-octadecyl ester of PME-5-azaC emerged as the most potent and selective PME-5-azaC prodrug against HSV, VZV and HCMV with EC50's of 0.15-1.12µM while PME-5-azaC only had marginal anti-herpesvirus activity. Although the bis(hexadecylamido-l-tyrosyl) and the bis(POM) esters of PME-5-azaC were also very potent anti-herpesvirus drugs, these were less selective than the mono-octadecyl ester prodrug.

• Klíčová slova
• 5-Azacytosine, Acyclic nucleoside phosphonates, Antivirals, HPMP-5-azaC, Open-ring, PME-azaC, PMEO-DAPy, Phosphonate, Prodrug,
• MeSH
• antivirové látky chemická syntéza   chemie   farmakologie   MeSH
• buněčné linie MeSH
• Cytomegalovirus účinky léků   MeSH
• lidé MeSH
• organofosfonáty chemická syntéza   chemie   farmakologie   MeSH
• prekurzory léčiv chemická syntéza   chemie   farmakologie   MeSH
• pyrimidinové nukleosidy chemie   MeSH
• Simplexvirus účinky léků   MeSH
• virus varicella zoster účinky léků   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• antivirové látky MeSH
• organofosfonáty MeSH
• prekurzory léčiv MeSH
• pyrimidinové nukleosidy MeSH

2-Amino-4,6-bis[(phosphonomethoxy)alkoxy]pyrimidines bearing two equal or different achiral or chiral phosphonoalkoxy chains have been prepared either by aromatic nucleophilic substitution of 2-amino-4,6-dichloropyrimidine or by alkylation of 4,6-dihydroxy-2-(methylsulfanyl)pyrimidine with appropriate phosphonate-bearing building block. Alkylation of 4,6-dihydroxy-2-(methylsulfanyl)pyrimidine proved to be the method of choice for efficient preparation of variety of bisphosphonates. The enantiomeric purity of selected compounds was determined by capillary electrophoresis. Antiviral activity of bisphosphonates is discussed.

• MeSH
• alkylace MeSH
• antivirové látky chemická syntéza   chemie   farmakologie   MeSH
• bisfosfonáty chemická syntéza   chemie   farmakologie   MeSH
• elektroforéza kapilární MeSH
• HeLa buňky MeSH
• HL-60 buňky MeSH
• lidé MeSH
• molekulární struktura MeSH
• myši MeSH
• nádorové buněčné linie MeSH
• nukleosidy chemie   MeSH
• proliferace buněk účinky léků   MeSH
• pyrimidiny chemická syntéza   chemie   farmakologie   MeSH
• screeningové testy protinádorových léčiv MeSH
• stereoizomerie MeSH
• vztahy mezi strukturou a aktivitou MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Research Support, N.I.H., Extramural MeSH
• Názvy látek
• antivirové látky MeSH
• bisfosfonáty MeSH
• nukleosidy MeSH
• pyrimidiny MeSH

PURPOSE: Series of N,N-dimethylamino acid esters was synthesized to study their transdermal permeation-enhancing potency, biodegradability and reversibility of action. Effects of chirality, linking chain length and polyfluorination were investigated. MATERIALS AND METHODS: In vitro activities were evaluated using porcine skin and four model drugs-theophylline, hydrocortisone, adefovir and indomethacin. Biodegradability was determined using porcine esterase, reversibility was measured using electrical resistance. RESULTS: No differences in activity were found between (R), (S) and racemic dodecyl 2-(dimethylamino)propanoate (DDAIP). Substitution of hydrocarbon tail by fluorocarbon one resulted in loss of activity. Replacement of branched linking chain between nitrogen and ester of DDAIP by linear one markedly improved penetration-enhancing activity with optimum in 4-6C acid derivatives. Dodecyl 6-(dimethylamino)hexanoate (DDAK) was more potent than clinically used skin absorption enhancer DDAIP for theophylline (enhancement ratio of DDAK and DDAIP was 17.3 and 5.9, respectively), hydrocortisone (43.2 and 11.5) and adefovir (13.6 and 2.8), while DDAIP was better enhancer for indomethacin (8.7 and 22.8). DDAK was rapidly metabolized by porcine esterase, and displayed low acute toxicity. Electrical resistance of DDAK-treated skin barrier promptly recovered to control values. CONCLUSION: DDAK, highly effective, broad-spectrum, biodegradable and reversible transdermal permeation enhancer, is promising candidate for future research.

• MeSH
• adenin analogy a deriváty   metabolismus   MeSH
• alanin aplikace a dávkování   analogy a deriváty   chemická syntéza   farmakologie   MeSH
• aplikace kožní MeSH
• časové faktory MeSH
• dimethylaminy MeSH
• dodekanol MeSH
• elektrická impedance MeSH
• esterasy metabolismus   MeSH
• farmaceutická chemie MeSH
• halogenace MeSH
• hydrokortison metabolismus   MeSH
• hydrolýza MeSH
• indomethacin metabolismus   MeSH
• isomerie MeSH
• kapronáty aplikace a dávkování   chemická syntéza   farmakologie   MeSH
• kožní absorpce účinky léků   MeSH
• kůže účinky léků   metabolismus   MeSH
• methylaminy aplikace a dávkování   chemická syntéza   farmakologie   MeSH
• molekulární struktura MeSH
• nosiče léků MeSH
• organofosfonáty metabolismus   MeSH
• prasata MeSH
• příprava léků MeSH
• stabilita léku MeSH
• theofylin metabolismus   MeSH
• vztahy mezi strukturou a aktivitou MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• srovnávací studie MeSH
• Názvy látek
• adefovir MeSH Prohlížeč
• adenin MeSH
• alanin MeSH
• dimethylaminy MeSH
• dodecyl 2-(N,N-dimethylamino)propionate MeSH Prohlížeč
• dodecyl 6-(dimethylamino)hexanoate MeSH Prohlížeč
• dodekanol MeSH
• esterasy MeSH
• hydrokortison MeSH
• indomethacin MeSH
• kapronáty MeSH
• methylaminy MeSH
• nosiče léků MeSH
• organofosfonáty MeSH
• theofylin MeSH