Abstract:
:Mikania laevigata, popularly known in Brazil as guaco, is widely used for respiratory disorders. As this plant is rich in coumarins, there is evidence of indications that it may cause bleeding and therefore should not be used concomitantly with anticoagulants. The basis of this information is very theoretical, with no clinical evidence of such contraindication. Thus, the aim of this study was to evaluate the in vitro effect of M. laevigata extract on blood coagulation through prothrombin time (PT) and activated partial thromboplastin time (aPTT) tests, fibrinogen plasma concentration, and the new thrombin generation test, which investigate, with high sensibility, hemostatic changes (CAAE 60904316.6.0000.5149), besides evaluating its qualitative micromolecular composition, providing scientific evidence to support the management of patients taking warfarin. Ethanolic extracts of guaco leaves were incubated with a plasma pool of healthy individuals at concentrations of 1.67, 2.26, and 2.86 mg/mL. The presence of flavonoids, tannins, coumarins, and triterpenes was demonstrated by selective reagents in thin layer chromatography. Benzoylgrandifloric acid, cinnamoylgrandifloric acid, o-coumaric acid, coumarin, and quercetin-3-β-glucoside were identified by coinjection in ultraperformance liquid chromatography. The extract at all concentrations prolonged TP and aPPT and reduced the potential for endogenous thrombin potential by the thrombin generation test. The control plasma had endogenous thrombin potential = 1465 nM/min, and after the addition of M. laevigata extract (2.26 mg/mL), this value was reduced to 1087 nM/min, indicating a lower generation of thrombin. Related to fibrinogen plasma concentration, concentrations of 2.26 and 2.86 mg/mL were effective in reducing plasma fibrinogen levels. These results allow us to conclude that the guaco extract demonstrated an anticoagulant effect in vitro, possibly interfering with intrinsic, extrinsic, and common coagulation pathways. A discussion on the contribution of the identified substances to the activity is also present.
journal_name
J Cardiovasc Pharmacoljournal_title
Journal of cardiovascular pharmacologyauthors
Leite PM,Miranda APN,Amorim JM,Duarte RCF,Bertolucci SKV,Carvalho MDG,Castilho ROdoi
10.1097/FJC.0000000000000745subject
Has Abstractpub_date
2019-12-01 00:00:00pages
574-583issue
6eissn
0160-2446issn
1533-4023pii
00005344-201912000-00014journal_volume
74pub_type
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
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更新日期:1995-01-01 00:00:00
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pub_type: 临床试验,杂志文章,随机对照试验
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pub_type: 临床试验,杂志文章,随机对照试验
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
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journal_title:Journal of cardiovascular pharmacology
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doi:10.1097/00005344-199204000-00014
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journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章
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pub_type: 临床试验,杂志文章,随机对照试验
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journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
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journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章
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