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1.
Rev. bras. anal. clin ; 50(2): 153-160, nov. 23, 2018. tab, ilus
Article in Portuguese | LILACS | ID: biblio-963767

ABSTRACT

Objetivo: Objetivou-se analisar o consumo alimentar e os níveis plasmáticos de zinco além de biomarcadores do status oxidativo de pacientes com infecção pelo HIV. Métodos: Foram selecionados indivíduos adultos com HIV e contagem de linfócitos T CD4<500 células/mm3, assistidos por um centro especializado, localizado na região oeste do Paraná. Realizou-se a aplicação de questionários, avaliação antropométrica e coleta sanguínea para análise de zinco e biomarcadores do status oxidativo. Resultados: Avaliou-se um total de quarenta indivíduos adultos, nos quais se observaram consumo adequado de zinco e grande frequência de eutrofia e sobrepeso. Obteve-se correlação positiva entre tióis proteicos (SH-P) e os níveis plasmáticos de zinco e correlação negativa entre SH-P e a peroxidação lipídica (PL) no plasma e nos eritrócitos. Além disso, verificou-se um aumento nos níveis de SH-P em pacientes com presença de doença oportunista em alguma fase da infecção viral. Conclusão: Apesar de não ter sido observada relação entre níveis de zinco sanguíneo e a contagem de linfócitos T CD4 e carga viral, as propriedades do mineral ainda são defendidas como essenciais.


Subject(s)
Zinc/adverse effects , Serologic Tests , Nutritional Status , Acquired Immunodeficiency Syndrome , Oxidative Stress , Biomarkers , HIV Infections
2.
Redox Rep ; 19(5): 206-13, 2014 Sep.
Article in English | MEDLINE | ID: mdl-24725132

ABSTRACT

OBJECTIVE: This study aimed to investigate the effect of the leaf extracts of Syzygium jambos and Solanum guaraniticum on the δ-aminolevulinate dehydratase (δ-ALA-D) activity, their antioxidant activity and potential protective action on oxidatively stressed erythrocytes, in order to demonstrate the safety or toxicity of the plant. METHODS: In erythrocyte samples, the effect of both extracts on δ-ALA-D activity, H2O2-induced oxidative stress, and 2,2'azobis (2-amidinopropane) (AAPH)-induced hemolysis was evaluated, as well as some antioxidant mechanisms. RESULTS: Both extracts inhibited δ-ALA-D activity (S. guaraniticum > S. jambos), and an involvement of the zinc ion of the δ-ALA-D structure on the inhibition of enzyme activity was verified. S. jambos leaf extract showed marked efficiency in countering H2O2-induced lipid peroxidation and in maintaining cellular integrity against AAPH-induced hemolysis. Furthermore, S. jambos exhibited greater H2O2 scavenging activity and stronger reduction power than S. guaraniticum. DISCUSSION: Both extracts bear potent antioxidant property as an important beneficial effect. However, the inhibition of δ-ALA-D activity suggests a possible harmful effect of these vegetal preparations and indicates the need for further investigation regarding their toxicological properties. All together, these data represent a significant contribution to the knowledge of these plants, both to the scientific community and to the folk medicine.


Subject(s)
Erythrocytes/drug effects , Oxidative Stress/drug effects , Plant Extracts/pharmacology , Plant Leaves/chemistry , Porphobilinogen Synthase/metabolism , Solanum/chemistry , Syzygium/chemistry , Amidines/pharmacology , Antioxidants/metabolism , Erythrocytes/enzymology , Hemolysis/drug effects , Humans , Hydrogen Peroxide/pharmacology , Lipid Peroxidation/drug effects , Oxidants/pharmacology , Oxidation-Reduction
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