No abstract

Mesenchymal stem cells present clinical potential to recover and regenerate injured tissues in diverse pathologies. The in vitro expansion and characterization of these cells contribute to elucidation of the mechanisms of senescence and strategies involving cell therapies. This study aimed to compare specific characteristics between initial and advanced passages of mesenchymal stem cells derived from adipose tissue and bone marrow. Both cell types were characterized according to immunophenotype, osteogenic differentiation, genomic instability, migration assay, doubling population time and colony forming ability. Our results demonstrated that both cell types were able to maintain an immunophenotypic profile typical of mesenchymal stem cells during increasing passages. Adipose stem cells at initial passage presented greater migration capacity compared to advanced passage cells, and advanced passage cells proliferated faster than initial passage cells. Bone marrow stem cells at early passages presented higher osteogenic potential than advanced. At advanced passages they presented higher colony forming capacity and genetic damage than those at initial passage. These results suggest that mesenchymal stem cells maintained in culture presented characteristics of senescence that should be monitored prior the use in regenerative medicine and cells derived from bone marrow at initial passage have better potential for therapeutic use in bone tissue engineering.

Radiopharmaceuticals are compounds that have a radionuclide and may be gamma-radiation emitter (γ) or positrons emitter (β+), linked to a molecule with specific diagnostic and therapeutic purposes. The progress in the use of radiopharmaceuticals has culminated to a sector in common with other types of drugs: regulation and surveillance. From 2006 on, production, marketing and use of these drugs were open to the Brazilian market granting much more freedom due to the Constitutional Amendment 49, resulting from the previous Constitutional Amendment 199/03 which removes the Union monopoly for this kind of manipulation and granted this production to other nuclear medicine. From this date on, the amount of this type of sold product have been greatly increased, and the nucleus of surveillance and regulation in Brazil have also advanced in the legislative processes, creating documents that are now more focused on radiopharmaceuticals in the national territory (Resolutions No. 63 and No. 64). In international overview, there is too much to be done in regulatory terms in Brazil, such as adding mainly issues of drugs surveillance to pharmacovigilance practice in radiopharmaceuticals drugs.Uniterms: Radiopharmaceuticals/regulation. Radiopharmaceuticals/ surveillance.Radiopharmaceuticals/ pharmacovigilance.Pharmacovigilance/practice in radiopharmaceuticals drugs. Brazilian legislation/ radiopharmaceuticals control.Radiofármacos são compostos que possuem um radionucleotídeo, podendo ser emissor de radiação gama (γ) ou emissor de pósitrons (β+), ligado a uma molécula específica com finalidade diagnóstica e terapêutica. O avanço no uso dos radiofármacos tem culminado a um setor em comum com outros tipos de medicamentos: a regulamentação e fiscalização. Após 2006, a produção, a comercialização e a utilização destes medicamentos foram abertas ao mercado interno brasileiro com maior liberdade, pois a Emenda Constitucional 49, vinda da Emenda Constitucional 199/03, que retira da União o monopólio deste tipo de manipulação, ofereceu a outros centros de medicina nuclear a oportunidade desta produção. A partir desta data, a quantidade comercializada deste tipo de medicamento aumentou absurdamente e os núcleos de vigilância e regulamentação do Brasil avançaram também nos processos legislativos, criando os documentos mais voltados a Radiofármacos existentes no território nacional, as Resoluções n° 63 e n° 64. Em visão internacional, há muito ainda a ser feito em termos regulatórios no Brasil somando principalmente os assuntos vigilantes dos medicamentos como a prática de Farmacovigilância em Radiofármacos.Unitermos: Radiofármacos/regulamentação. Radiofármacos/fiscalização. Radiofármacos/ farmacovigilância. Farmacovigilância/prática em radiofármacos. Legislação brasileira/controle de radiofármacos.