Autor(es)

Azevedo Sachetto, Ana Teresa ^{[1, 2]} ; Jensen, Jose Ricardo ^[3] ; Santoro, Marcelo Larami ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Butantan Inst, Lab Pathophysiol, Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Sch Med, Dept Med Sci, Sao Paulo, SP - Brazil

^[3] Butantan Inst, Lab Immunogenet, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLoS Neglected Tropical Diseases; v. 14, n. 6 JUN 2020.
• Citações Web of Science: 0

Resumo

Few studies have addressed gene expression of hemostasis-related factors during acute thrombo-hemorrhagic diseases. Bites by the lanced-headed viper Bothrops jaracaca induce rapid hemostatic disturbances in victims, leading to systemic bleedings, thrombocytopenia and consumption coagulopathy. Although circulating levels of coagulation factors recover rapidly after administration of specific antivenom therapy, it is unclear if B. jararaca venom (BjV) upregulates the mRNA synthesis of hepatic hemostasis-related factors, or if the recovery occurs under basal conditions after the neutralization of venom components by antivenom. Thus, we aimed to investigate if BjV regulates gene expression of important hemostasis-related factors synthetized by the liver. On that account, Swiss mice were injected with saline or BjV (1.6 mg/kg b.w, s.c.), and after 3, 6 and 24 h blood samples and liver fragments were collected to analyze mRNA expression by real-time qPCR. Increased gene expression of fibrinogen chains, haptoglobin and STAT3 was observed during envenomation, particularly at 3 and 6 h. At 24h, mRNA levels of F10 were raised, while those of Serpinc1, Proc and Adamts13 were diminished. Surprisingly, F3 mRNA levels were steadily decreased at 3 h. Gene expression of Thpo, F7, F5 Tfpi, Mug1 was unaltered. mRNA levels of Vwf, P4hb, F8, F2, Plg, and Serpinf2 were minimally altered, but showed important associations with Nfkb1 gene expression. In conclusion, snakebite envenomation upregulates hepatic mRNA synthesis particularly of fibrinogen chains, and acute-phase markers. This response explains the fast recovery of fibrinogen levels after antivenom administration to patients bitten by B. jararaca snakes. (AU)

• Processo FAPESP: 18/26015-8 - Novos mecanismos de patogênese da Sepse e do envenenamento botrópico: potencial da rutina como agente terapêutico
• Beneficiário: Ana Teresa Azevedo Sachetto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/25177-0 - Envolvimento do fator de Von Willebrand nos distúrbios hemostáticos do envenenamento pela serpente Bothrops jararaca: estudo experimental
• Beneficiário: Marcelo Larami Santoro
• Modalidade de apoio: Auxílio à Pesquisa - Regular