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Torello CO, Souza-Queiroz J, Queiroz MLS. β-1,3-Glucan given orally modulates immunomyelopoietic activity and enhances the resistance of tumour-bearing mice. Clin Exp Pharmacol Physiol 2012; 39:209-17. [DOI: 10.1111/j.1440-1681.2011.05655.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- CO Torello
- Department of Pharmacology and Hemocentre; School of Medical Sciences; State University of Campinas (UNICAMP); Campinas; São Paulo; Brazil
| | - J Souza-Queiroz
- Department of Pharmacology and Hemocentre; School of Medical Sciences; State University of Campinas (UNICAMP); Campinas; São Paulo; Brazil
| | - MLS Queiroz
- Department of Pharmacology and Hemocentre; School of Medical Sciences; State University of Campinas (UNICAMP); Campinas; São Paulo; Brazil
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Ramos AL, Torello CO, Queiroz MLS. Chlorella vulgarisModulates Immunomyelopoietic Activity and Enhances the Resistance of Tumor-Bearing Mice. Nutr Cancer 2010; 62:1170-80. [DOI: 10.1080/01635581.2010.513801] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Valadares MC, De Carvalho ICT, Junior LDO, De Sousa Vieira M, Benfica PL, De Carvalho FS, Andrade LVS, Lima EM, Kato MJ. Cytotoxicity and antiangiogenic activity of grandisin. J Pharm Pharmacol 2010. [DOI: 10.1211/jpp.61.12.0017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
Objectives
The antitumoural properties of grandisin, a tetrahydrofuran neolignan from Piper solmsianum, were investigated by in-vitro and in-vivo assays using the Ehrlich ascites tumoural (EAT) model.
Methods
Viability of the tumour cells was evaluated by Trypan blue exclusion and MTT methods, after incubation with grandisin (0.017-2.3 μM). The effects of grandisin on the activity of caspase-3, −6, −8, and −9 were also investigated using colorimetric protease kits. In-vivo studies were performed in EAT-bearing mice treated intraperitoneally with 2.5, 5 or 10 mg/kg grandisin for 10 days.
Key findings
Grandisin inhibited the growth of EAT cells, by both methods, with IC50 values less than 0.25 μM. The results showed that the activity of all the caspases studied increased in grandisin-treated cells, when compared with control, non-treated cells. Administering grandisin to EAT-bearing mice increased survival of the animals, in a dose-dependent manner. Simultaneously, we detected a 66.35% reduction of intraperitoneal tumour cell burden in the animals treated with 10 mg/kg grandisin. Additionally, in these animals, the marked increase of vascular endothelial growth factor (VEGF) levels, induced by EAT development, was decreased with treatment with grandisin, resulting in a reduction of 32.1% of VEGF levels in the peritoneal washing supernatant, when compared with the control.
Conclusions
The results demonstrated that grandisin induced in-vitro cytotoxicity and antiangiogenic effects in mice while it acted against tumour evolution, prolonging host survival.
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Affiliation(s)
- Marize C Valadares
- Laboratório de Farmacologia e Toxicologia Celular, Universidade Federal de Goiás, Goiânia, Go, Brazil
| | | | - Luiz de Oliveira Junior
- Laboratório de Farmacologia e Toxicologia Celular, Universidade Federal de Goiás, Goiânia, Go, Brazil
| | - Marcelo De Sousa Vieira
- Laboratório de Farmacologia e Toxicologia Celular, Universidade Federal de Goiás, Goiânia, Go, Brazil
| | - Polyana Lopes Benfica
- Laboratório de Farmacologia e Toxicologia Celular, Universidade Federal de Goiás, Goiânia, Go, Brazil
| | - Flávio Silva De Carvalho
- Laboratório de Farmacologia e Toxicologia Celular, Universidade Federal de Goiás, Goiânia, Go, Brazil
| | | | - Eliana Martins Lima
- Laboratório de Tecnologia Farmacêutica, Faculdade de Farmácia, Universidade Federal de Goiás, Goiânia, Go, Brazil
| | - Massuo Jorge Kato
- Laboratório de Química de Produtos Naturais, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
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Valadares MC, Ramos AL, Rehmann FJK, Sweeney NJ, Strohfeldt K, Tacke M, Queiroz MLS. Antitumour activity of [1,2-di(cyclopentadienyl)-1,2-di(p-N,N-dimethylaminophenyl)-ethanediyl] titanium dichloride in xenografted Ehrlich's ascites tumour. Eur J Pharmacol 2006; 534:264-70. [PMID: 16513106 DOI: 10.1016/j.ejphar.2006.01.056] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2005] [Revised: 01/23/2006] [Accepted: 01/25/2006] [Indexed: 01/19/2023]
Abstract
The effects of a new titanocene compound with an ansa ligand in the cyclopentadienyl rings, the 1,2-di(cyclopentadienyl)-1,2-di(p-N,N-dimethylaminophenyl)-ethanediyl] titanium dichloride (TITANOCENE X), on the growth and differentiation of granulocyte-macrophage progenitor cells [colony-forming unit-granulocyte-macrophage (CFU-GM)] and Natural killer (NK) cell activity in Ehrlich's ascites tumour (EAT)-bearing mice were studied. Myelosuppression concomitant with increased numbers of spleen CFU-GM was observed in tumour-bearing mice. Treatment of these animals with TITANOCENE X (2.5-50 mg/kg/day) produced an increase in myelopoiesis, in a dose-dependent manner, and reduced spleen colony formation. In addition, the treatment of EAT-bearing mice with 3 doses of 20 or 50 mg/kg TITANOCENE X restored to normal values the reduced Natural killer cell function observed during tumour growth. In parallel, TITANOCENE X prolonged, in a dose-dependent manner, the survival of mice inoculated with Ehrlich's ascites tumour. The highest dose of 50 mg/kg prolonged in 50% the survival time of EAT-bearing mice, compared to non-treated tumour-bearing controls. In comparison with previous results from our laboratory addressing the effects of titanocenes on haematopoiesis, we observed with TITANOCENE X a similar effective profile as for bis(cyclopentadienyl) dithiocyanate titanium(IV), being both less effective than di(cyclopentadienyl) dichloro titanium(IV), since the latter not only prolonged, but also increased the rate of survival. These differences in efficacy may be due to the nature of the ansa-cyclopentadienyl ligand used in TITANOCENE X, since the C2 bridge between the two cyclopentadienyl groups will increase the hydrolytic stability by an organometallic chelate effect. Also, the introduction of two dimethylamino substituents increases the water solubility of TITANOCENE X when compared to titanocene dichloride itself.
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Affiliation(s)
- Marize C Valadares
- Faculdade de Farmácia, Universidade Federal de Goiás, UFG, Goiânia, GO, Brazil
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