Made available in DSpace on 2014-12-17T14:13:35Z (GMT). No. of bitstreams: 1 RosaneFN.pdf: 281954 bytes, checksum: efc3b9461d551e53306fba9f9fa21a9d (MD5) Previous issue date: 2008-03-25 / Radionuclides have been used in Nuclear Medicine for diagnostic and treatment. In basic research, cellular and molecular structures are labeled with technetium-99m (99mTc) and used as radiobiocomplexes. Some natural or synthetic drugs are capable to alter the labeling of blood constituents with 99mTc, as well as in the biodistribution of radiobiocomplexes. Arctium lappa (Bardana) has been used to treat inflammatory processes. The aim of this work was to evaluate the effects of an extract of Bardana on the labeling of blood constituents with 99mTc, on the morphology of red blood cells, on the perimeter/area ratio of red blood cells and on the biodistribution of radiophamaceutical sodium pertechnetate in Wistar rats. Extract of Bardana was capable to alter the labeling of cellular compartment with 99mTc. Plasma and cellular proteins did not present alteration on the percentage of radioactivity (%ATI). Extract of Bardana was also capable to alter the morphology and the perimeter/area ratio of red blood cells. On the biodistribution of sodium pertechnetate in animals treated with the extract of Bardana, it was observed a small and significant uptake in liver, tooth and tongue, and a high and a significant uptake in stomach, lung and testis (p<0.05). In conclusion, these findings could be justified due to the effects of some chemical compounds in the Bardana extract. This study was a multidisciplinary experimental research. It was developed with the contribution of the different Departments and Services of the Hospital Universit?rio Pedro Ernesto of the Universidade Estadual do Rio de Janeiro / Radionucl?deos t?m sido utilizados em Medicina Nuclear para diagn?stico e tratamento de doen?as. Estruturas moleculares e celulares marcadas com tecn?cio-99m (99mTc) s?o utilizados como radiobiocomplexos, como acontece com alguns constituintes sang??neos. Algumas drogas naturais ou sint?ticas s?o capazes de alterar a marca??o de constituintes sang??neos com 99mTc, bem como a disponibilidade de radiobiocomplexos. Arctium lappa (Bardana) tem sido empregada para tratar processos inflamat?rios. O objetivo deste estudo foi avaliar efeitos de um extrato de Bardana na marca??o dos constituintes sang??neos marcados com 99mTc, na morfologia e na rela??o per?metro/?rea das hem?cias e na biodistribui??o do radiof?rmaco pertecnetato de s?dio (Na99mTcO4). O extrato de Bardana foi capaz de alterar a distribui??o 99mTc no compartimento celular. As prote?nas plasm?ticas e celulares n?o apresentaram nenhuma altera??o na fixa??o de radioatividade (%ATI). O extrato de Bardana tamb?m foi capaz de alterar a morfologia e a rela??o per?metro/?rea das hem?cias. Na biodistribui??o do pertecnetato de s?dio em animais tratados com o extrato de Bardana, foi observada uma redu??o significante na capta??o do f?gado, dente e l?ngua, e uma alta capta??o no est?mago, pulm?o e test?culo (p<0,05). Em conclus?o, o extrato de Bardana parece possuir subst?ncias em sua composi??o que podem ser respons?veis pelos achados experimentais. Desenvolvido em diferentes Departamentos e Servi?os da ?rea biom?dica do Hospital Universit?rio Pedro Ernesto, UERJ, atestando o car?ter multidisciplinar da pesquisa