Efeitos histológicos e bioquímicos séricos do alfa-tocoferol na lesão de isquemia e reperfusão em membro pélvico de ratos

PURPOSE: To evaluate the protective action of alpha-tocopherol in ischemia/reperfusion injuries of pelvic member of rats. METHODS: Thirty adult male rats of the Wistar strain were randomized into three experimental groups of 10: Group I - control group with no ischemia or reperfusion. Groups II and III - four hours of ischemia and of hours of reperfusion by means of clamping of the infrarenal aorta. The animals of Group II were treated with saline and those of Group III were treated with i.v. alpha-tocopherol (50 mg/kg). Parameters studied were biopsies of the soleus muscle, dosing of creatine phosphokinase, lactate dehydrogenase, potassium, calcium and arterial blood gasometry. RESULTS: The results of biopsies of the soleus muscles studied by optical microscopy, were not significant in terms of presence of edema among the three groups studied. Variables inflammation and necrosis were not observed, therefore cannot be statistically analyzed. As to dosing of calcium and lactate dehydrogenase, the pH, pO2 and pCO2 values were not significant for all groups studied. We observed that the levels of potassium (Group II > Group I, Fcalculated = 5.84; Fcritical = 3.33), creatine phosphokinase (Group II > Groups I and III, Hcalculated = 13.92; Hcritical = 5.99) and bicarbonate (Groups I and III > Group II, Hcalculated = 11.98; Hcritical = 5.99) presented significant results among groups. CONCLUSION: From the serum biochemical perspective, the treatment with alpha-tocopherol has attenuated the metabolic injuries in the ischemia/reperfusion syndrome in this experimental model.OBJETIVO: Avaliar ação protetora do alfa-tocoferol na lesão de isquemia e reperfusão em membro pélvico de ratos. MÉTODOS: Trinta ratos machos adultos da linhagem wistar foram distribuídos aleatoriamente, em três grupos experimentais, com 10 animais cada: Grupo I - Grupo controle sem isquemia ou reperfusão. Grupos II e III - quatro horas de isquemia e duas horas de reperfusão através clampeamento da aorta infra-renal. Os animais do grupo II foram tratados com solução salina e aqueles do grupo III, tratados com alfa-tocoferol 50 mg/kg por via endovenosa. Parâmetros estudados: Biópsias do músculo solear, dosagens da creatina fosfoquinase, da desidrogenasse láctica, do potássio, do cálcio e da hemogasometria arterial. RESULTADOS: Os resultados das biópsias dos músculos soleares estudados através da microscopia óptica, não foram significantes quanto a presença de edema entre os três grupos estudados. As variáveis inflamação e necrose não foram observadas e, portanto não analisáveis estatisticamente. Em relação às dosagens de cálcio e desidrogenase lática, pH, pO2, pCO2, não foram significantes em todos os grupos estudados. Observamos que os níveis de potássio (Grupo II > grupo I, F calculado = 5,84; F crítico = 3,33), creatina fosfoquinase (Grupo II > Grupo I e III, H calculado =13,92; Hcritico 5,99) , e bicarbonato (grupo I e III > grupo II, H calculado = 11,98; h critico 5.99 ) apresentaram resultados significantes entre os grupos. CONCLUSÃO: Tratamento com alfa-tocoferol do ponto de vista bioquímico sérico atenuou as lesões metabólicas na síndrome de isquemia e reperfusão neste modelo experimental.UNIFESP-EPMFaculty of Technology and ScienceUniversity of Sciences of AlagoasFederal University of BahiaOswaldo Cruz Foundation Histopathology UnitBahiana School of Medicine and Public Health Department of Experimental Surgery and Operative TechniqueUNIFESP-EPM Department of SurgeryGovernor Lamenha Filho University Foundation for Science and Health of Alagoas Department of SurgeryHeliopolis Hospital Vascular Surgery ServiceUNIFESP-EPM Department of Preventive MedicineUNIFESP, EPM, Department of SurgeryUNIFESP, EPM Department of Preventive MedicineSciEL

Reassessing the genetic variability of Tectona grandis through high-throughput genotyping: Insights on its narrow genetic base.

Teak (Tectona grandis Linn. f.) is considered one of the most expensive hardwoods in the world. The dispersion of the species over the years has taken the teak beyond its first sources of diversity and little is known about the genetic origin and genetic variability. Thus, this study aimed to investigate the genetic diversity and genetic population structure existing in a representative teak germplasm bank collection. DNA was extracted from young leaves and each sample were genotyped by whole genome sequencing at 3 giga bases per sample, the sequences are aligned using the genome, and SNPcalls and quality control were made. To study the population structure of the genotypes, Bayesian variational inference was used via fastStructure, the phylogenetic tree was based on the modified Euclidean distance and the clustering by the UPGMA hierarchical method. Genetic diversity was analyzed based on the pairwise genetic divergence (Fst) of Weir and Cockerham. Genotyping by sequencing resulted in a database of approximately 1.4 million of variations SNPs were used for analysis. It was possible to identify four populations with considerable genetic variability between and within them. While the genetic variability in teak is generally known to be narrow, this study confirmed the presence of genetic variability scale in teak, which is contrary to what was initially expected