In vitro breast cancer cell lethality of Brazilian plant extracts.

In this study we screened the cytotoxicity of 1220 plant extracts obtained from 351 plants belonging to 74 families occurring in the Amazon and Atlantic rain forests against MCF-7 human breast adenocarcinoma cell lines. All extracts were tested at a dose of 100 microg/mL. Only 11 aqueous or organic extracts belonging to the Annonaceae, Apocynaceae, Araceae, Clusiaceae, Flacourtiaceae, Leguminosae, Olacaceae and Violaceae showed marked lethal activity. Vismia guianensis and Annona hypoglauca extracts showed the greatest lethal activity.

In vitro prostate cancer cell growth inhibition by Brazilian plant extracts.

In the present study, 1220 plant extracts obtained from 352 plants belonging to 73 families that grow in the Amazon and Atlantic rain forests were screened for cytotoxicity against PC-3 prostate cancer cell lines. Extracts were tested in the single dose of 100 microg/mL. Activity was observed in 17 aqueous or organic extracts belonging to Annonaceae, Apocynaceae, Araceae, Capparaceae, Commelinaceae, Flacourtiaceae, Lecythidaceae, Leguminosae, Passifloraceae, Rutaceae, and Violaceae.

Analysis of the toxic potential of Palicourea corymbifera (Müll. Arg.) Standl. in laboratory animals.

Palicourea species may produce bovine toxicity. Palicourea corymbifera grows in terra firme forests within the Amazon rain forest and in Tropical America, particularly in spots that gave place to gazing areas. The lyophilized extract done with the aerial organs of P. corymbifera were analyzed in male and female mice. Results revealed a significant toxicity: LD50 was 1.10 (1.04-1.15)g/kg for male mice, and 1.05 (1.00-1.10)g/kg for female mice. Locomotion was affected as well as there were reflexes linked to environmental stimuli in addition to changes in posture. Progressive central nervous system stimulus signs such as trembling and convulsions were detected, the latter followed by the animal's death. Macroscopic histopathological exams performed on the liver, kidneys and lungs of mice submitted to necropsy did not indicate the existence of lesions. General activity of animals, measured in an open field, was reduced as a result of the administration of the extract. Duration of locomotion and rearing frequency were reduced, in opposition to an increase in the duration of immobility. Thin layer chromatography analysis showed that monofluoroacetic acid is present in the lyophilized extract, but other qualitative techniques as gas chromatography/mass spectrometry and 19F nuclear magnetic resonance showed that the MFAA was not present in the extract, and that the toxicity is related to other compound, although the toxic profile is very similar to that of MFAA. P. corymbifera was shown to be significantly toxic to laboratory animals and investigation of the possible toxic substance shall be done.

Screening of antibacterial extracts from plants native to the Brazilian Amazon Rain Forest and Atlantic Forest.

More than 20% of the world's biodiversity is located in Brazilian forests and only a few plant extracts have been evaluated for potential antibacterial activity. In the present study, 705 organic and aqueous extracts of plants obtained from different Amazon Rain Forest and Atlantic Forest plants were screened for antibacterial activity at 100 microg/ml, using a microdilution broth assay against Staphylococcus aureus, Enterococcus faecalis, Pseudomonas aeruginosa and Escherichia coli. One extract, VO581, was active against S. aureus (minimum inhibitory concentration (MIC)=140 microg/ml and minimal bactericidal concentration (MBC)=160 microg/ml, organic extract obtained from stems) and two extracts were active against E. faecalis, SM053 (MIC=80 microg/ml and MBC=90 microg/ml, organic extract obtained from aerial parts), and MY841 (MIC=30 microg/ml and MBC=50 microg/ml, organic extract obtained from stems). The most active fractions are being fractionated to identify their active substances. Higher concentrations of other extracts are currently being evaluated against the same microorganisms.

Screening of antibacterial extracts from plants native to the Brazilian Amazon Rain Forest and Atlantic Forest

More than 20 percent of the world's biodiversity is located in Brazilian forests and only a few plant extracts have been evaluated for potential antibacterial activity. In the present study, 705 organic and aqueous extracts of plants obtained from different Amazon Rain Forest and Atlantic Forest plants were screened for antibacterial activity at 100 µg/ml, using a microdilution broth assay against Staphylococcus aureus, Enterococcus faecalis, Pseudomonas aeruginosa and Escherichia coli. One extract, VO581, was active against S. aureus (minimum inhibitory concentration (MIC) = 140 µg/ml and minimal bactericidal concentration (MBC) = 160 µg/ml, organic extract obtained from stems) and two extracts were active against E. faecalis, SM053 (MIC = 80 µg/ml and MBC = 90 µg/ml, organic extract obtained from aerial parts), and MY841 (MIC = 30 µg/ml and MBC = 50 µg/ml, organic extract obtained from stems). The most active fractions are being fractionated to identify their active substances. Higher concentrations of other extracts are currently being evaluated against the same microorganisms.

Atividade antibacteriana e fracionamento direcionado do extrato orgânico obtido de Tovomita sp

O extrato orgânico obtido do caule de Tovomita sp. apresentou atividade antibacteriana significativa contra Staphylococcus aureus (CIM = 460 ?µg/mL e CBM = 490 µg/mL), Enterococcus faecalis (CIM = 500 ?µg/mL e CBM = 540 µg/mL) e Pseudomonas aeruginosa (CIM = 300 ?µg/mL e CBM = 400 µg/mL). As frações obtidas do extrato orgânico apresentaram atividade antimicrobiana contra E. faecalis (CIM F1 = 570 µg/mL e CBM F1 = 840 µg/mL; CIM F2 = 480 µg/mL e CBM F2 = 720 µg/mL, respectivamente) e contra P. aeruginosa (CIM F1 = 310 µg/mL e CBM F1 = 570 µg/mL; CIM F2 = 310 µg/mL e CBM F2 = 460 µg/mL, respectivamente).

The organic extract obtained of the stem of Tovomita sp. did it present significant antibacterial activity against Staphylococcus aureus (CIM = 460 µg/mL and CBM = 490 µg/mL), Enterococcus faecalis (CIM = 500 µg/mL and CBM = 540 µg/mL) and Pseudomonas aeruginosa (CIM = 300 µg/mL and CBM = 400 µg/mL). The obtained fractions of the organic extract present antibacterial activity against E. faecalis (CIM F1 = 570 µg/mL and CBM F1 = 840 µg/mL; CIM F2 = 480 µg/mL and CBM F2 = 720 µg/mL, respectively) and against P. aeruginosa (CIM F1 = 310 µg/mL and CBM F1 = 570 µg/mL; CIM F2 = 310 µg/mL and CBM F2 = 460 µg/mL, respectively).

Treatment of disseminated malignant melanoma with high-dose oral BCG.

Thirty patients with unresectable disseminated melanoma (Stage IV) were treated with Bacillus Calmette-Guerin (BCG) (Moreau strain--Rio de Janeiro) by mouth, with weekly doses ranging between 200 mg and 28,000 mg. Five patients died in the first two months of treatment. Of the remaining 25 patients, two (8%) showed complete regression, and one (4%) partial regression. Seven patients (28%) had stabilization of the disease for a six-month period, and 15 (60%) had progression of the disease. Complete and partial regressions were seen only in patients with extravisceral (subcutaneous) metastases, and were associated with a longer survival time. Regression of the subcutaneous metastatic nodules was always accompanied by the following local phenomena: increased temperature; local inflammation; softening, pain and pruritus at the nodule site; and a gradual decrease in size. At the site of the tumor mass, a hypochromic halo appeared. This halo remained permanently and was pathognomonic of the metastatic nodule rejection. When the halo was fully established, the inflammatory infiltrate was minimal and the malignant cells disappeared. If the area contained hairs, they underwent complete albinization. Serial biopsies of the nodules undergoing inflammatory changes and decreased consistency exhibited an intense cellular infiltration of lymphocytes, macrophages, and plasma cells around the malignant cells. This sometimes simulated lymphoid follicle formation involving the melanoma cells associated with necrosis in a centripetal way. Some patients with visceral metastases (particularly pulmonary) had an unexpectedly long survival, apparently associated with interruption of the growth rate of the masses. Eleven out of 20 deaths were due to cerebral metastases. When cerebral disease was diagnosed, BCG was discontinued and the administration of corticoids was usually associated with a disappearance of the inflammatory signs at the nodule sites, but with progression of the disease. Toxicity was minimal.

Mammary carcinoma--multidisciplinary treatment with bilateral mastectomy and immediate reconstruction.

The classical concepts pertaining to the natural history of mammary carcinoma and its treatment must be reviewed if survival rate is to be improved. By the time diagnosis is established, a fair amount of cases of carcinoma of the breast present distant, clinically undetectable micrometastases, which will not be affected by local therapy (surgery or radiation). Increasing evidence shows that mammary carcinoma nowadays must be looked upon as a diffuse disease affecting both breasts. Postoperative radiation does not improve the 5- and 10-year survival rates and has a negative effect upon the immunological defense of the patient. Immunology plays an important role in the evolution and cure of the patient with carcinoma of the breast. The mutilation produced by radical or ultraradical mastectomy may throw the patient into mental depression which, as a consequence, may decrease the immunological competence of the patient. Multiple drug chemotherapy, started at the time of surgery and continued for several months thereafter, may kill micrometastases. Preventive immunotherapy seems to be beneficial to the patient in attempting control of metastases.