In the present article, we describe the synthesis, anti-HIV1 profile and molecular modeling evaluation of 11 oxoquinoline derivatives. The structure-activity relationship analysis revealed some stereoelectronic properties such as LUMO energy, dipole moment, number of rotatable bonds, and of hydrogen bond donors and acceptors correlated with the potency of compounds. We also describe the importance of substituents R(2) and R(3) for their biological activity. Compound 2j was identified as a lead compound for future investigation due to its: (i) high activity against HIV-1, (ii) low cytotoxicity in PBMC, (iii) low toxic risks based on in silico evaluation, (iv) a good theoretical oral bioavailability according to Lipinski 'rule of five', (v) higher druglikeness and drug-score values than current antivirals AZT and efavirenz.

In the present study we investigated the presence of infections by vaccinia-like viruses in dairy cattle from 12 counties in the state of Rio de Janeiro in the last 9 years. Clinical specimens were collected from adult animals with vesicular/pustular lesions mainly in the udder and teats, and from calves with lesions around the nose and mouth. A plaque reduction neutralization test (PRNT) was applied to search for antibodies to Orthopoxvirus; the vesicular/pustular fluids and scabs were examined by PCR, electron microscopy (EM) and by inoculation in VERO cells for virus isolation. Antibodies to Orthopoxvirus were detected in most cases. The PCR test indicated a high nucleotide homology among the isolates and the vaccinia viruses (VACV) used as controls. By EM, typical orthopoxvirus particles were observed in some specimens. The agents isolated in tissue culture were confirmed as vaccinia-like viruses by EM and PCR. The HA gene of the vaccinia-like Cantagalo/IOC virus isolated in our laboratory was sequenced and compared with other vaccinia-like isolates, showing high homology with the original Cantagalo strain, both strains isolated in 1999 from dairy cattle. Antibodies to Orthopoxvirus were detected in one wild rodent (genus Akodon sp.) collected in the northwestern region of the state, indicating the circulation of poxvirus in this area. Nonetheless, PCR applied to tissue samples collected from the wild rodents were negative. Vesicular/pustular lesions in people in close contact with animals have been also recorded. Thus, the vaccinia-like virus infections in cattle and humans in the state seem to be an expanding condition, resulting in economic losses to dairy herds and leading to transient incapacitating human disease. Therefore, a possible immunization of the dairy cattle in the state should be carefully evaluated.

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ABSTRACT

Twenty-one vertically HIV-1 infected children were assessed for drug resistance genotyping. Eighteen children presented at least one mutation conferring resistance to the nucleoside reverse transcriptase inhibitors, and seven children presented resistance to the non-nucleoside inhibitors. Among them, two children in whom the therapy had been discontinued two to three years before testing presented K101E, K103N, and G190A mutations conferring resistance to all the non-nucleoside drugs available for treatment. Protease gene mutations conferring resistance to at least two to up to twelve drugs were reported in 12 children. Studies in HIV-infected children have a particular meaning, and with antiretroviral therapy becoming more widely available, surveillance of viral resistance regional levels is relevant for treatment guidelines, supporting the rational use of antiretroviral drugs by treatment programs. Additional larger studies are still required to give more information on HIV-1 drug resistance in pediatric patients.