Gastro-protective effects of isobrucein B, a quassinoid isolated from Picrolemma sprucei

Autor(es)

Vieira, Silvio Manfredo ^{[1, 2]} ; Silva, Rangel Leal ^[2] ; Lemos, Henrique Paula ^[2] ; das Neves Amorim, Rodrigo Cesar ^[1] ; Costa Silva, Ellen Cristina ^[1] ; Reinach, Peter Sol ^[2] ; Cunha, Fernando Queiroz ^[2] ; Pohlit, Adrian Martin ^[1] ; Cunha, Thiago Mattar ^[2]

Afiliação do(s) autor(es)

^[1] Natl Inst Res Amazon INPA, BR-69060001 Manaus, Amazonas - Brazil

^[2] Univ Sao Paulo, Ribeirao Preto Med Sch, Dept Pharmacol, BR-14049900 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Fitoterapia; v. 95, p. 8-15, JUN 2014.
• Citações Web of Science: 3

Resumo

Infusions of Picrolemma sprucei roots, stems and leaves are used in traditional medicine throughout the Amazon region from the Guianas to Brazil and Peru in the treatment of gastritis, intestinal helminths and malaria. As there are no studies describing its mode of action in providing a gastroprotective effect, we determined herein that one of the main constituents found in P. sprucei infusions, the quassinoid isobrucein B (IsoB), reduces some of the pathophysiological effects in a mouse model of non-steroidal anti-inflammatory drug (NSAID)-induced gastritis and provides mechanisms of action. Then, IsoB (1.17 g) was isolated from the roots and stems (6.5 kg) of P. sprucei. Its structure was confirmed by 1D and 2D H-1 and C-13 NMR, ESI-tof-MS, IR and UV. C57BL/6 strain mice were subcutaneously injected with IsoB (0.5-5 mg kg(-1)) or vehicle before oral administration of indomethacin and sacrificed later at different time points. Gastric damage was assessed by measuring lesion length. Leukocyte migration was evaluated based on leukocyte rolling and adhesion using intravital microscopy in the mesenteric microcirculation and tissue MPG activity, Stomach extract cytoldne (TNF alpha, IL-1 beta and KC/CXCL1) and prostaglandin E-2 (PGE(2)) levels were measured by ELISA and RIA, respectively. IsoB pre-treatment (0.5-5.0 mg kg(-1)) significantly reduced the formation of indomethacin-induced stomach lesions in a dose-dependent manner. The decrease in stomach lesions was associated with less observed leukocyte rolling, decreased leukocyte adhesion and less neutrophil infiltration (MPG activity). IsoB (1 mg kg(-1)) pre-treatment did not prevent indomethacin-induced decreases in stomach PGE(2) levels. However, IL-beta and KC/CXCL1 levels were inhibited by this same IsoB dosage, whereas TNF-alpha was unchanged. IsoB may be a prototypic compound to provide protective effects against NSAID-induced gastritis and possibly other gastropathies. Moreover, IsoB gastroprotective action may be due to a reduction in IL-1 beta and KC/CXCL1 production/release and leukocyte rolling, adhesion and migration. (C) 2014 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/19670-0 - Mecanismos envolvidos na fisiopatologia da artrite reumatóide, dor e sepse
• Beneficiário: Fernando de Queiroz Cunha
• Modalidade de apoio: Auxílio à Pesquisa - Temático