Abstract
Hibiscus sabdariffa L. is a worldwide component for tea and beverages, being a natural source of anthocyanins, which are associated with cardiovascular activities. To investigate this relationship, we explored different methods of aqueous extraction on the anthocyanin content and antioxidant activity of H. sabdariffa L. calyx extract (HSCE). Pharmacological effects via platelet aggregation, calcium mobilization, cyclic nucleotide levels, vasodilator-stimulated phosphoprotein Ser157 and Ser239, and on the vasomotor response of aortic rings isolated from mice are studied herewith. We found that the application of ultrasonic turbolization, 20 min, combined with acidified water was significantly more effective in the extraction process, providing extracts with the highest levels of anthocyanins (8.73 and 9.63 mg/100 g) and higher antioxidant activity (6.66 and 6.78 μM trolox/g of sample). HSCE significantly inhibited (100–1000 μg/mL) arachidonic acid-induced platelet aggregation, reduced calcium mobilization, and increased cAMP and cGMP levels with VASPSer157 and VASPSer239 phosphorylation. Vasorelaxation reduction was confirmed by the aortic rings and endothelium assays treated with nitric oxide synthase inhibitors, soluble guanylyl cyclase (sGC) oxidizing agent, or Ca2+-activated K+ channel inhibitor. The increasing of cGMP levels could be understood considering the sGC stimulation by HSCE compounds in the specific stimulus domain, which allows an understanding of the observed antiplatelet and vasorelaxant properties of H. sabdariffa L. calyx extract.
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Data Availability
All data analyzed and generated in the study is presented in the article, any additional data or information can be made available on request to the authors.
Abbreviations
- ABTS :
-
2,2′-Azino-bis (3-ethylbenzothiazoline-6-sulfonic acid)
- Ach :
-
Acetylcholine
- AW :
-
Acidified water
- AA :
-
Arachidonic acid
- ACD-C :
-
Acid citrate-dextrose anticoagulant
- BSA :
-
Bovine serum albumin
- cAMP :
-
Cyclic adenosine monophosphate
- cGMP :
-
Cyclic guanosine monophosphate
- CRCs :
-
Cumulative concentration–response curves
- DPPH :
-
2,2-Diphenyl-1-picryl-hidrazil
- DW :
-
Distilled water
- EGTA :
-
Ethylene glycol-bis(2-aminoethylether)-N,N,N′,N′-tetraacetic acid
- EPG :
-
Epigallocatechin-3-gallate
- Fura-2 AM :
-
Fura-2-acetoxymethyl ester
- GBD :
-
Glibenclamide
- GTP :
-
Guanosine-5′-triphosphate
- HSCE :
-
H. sabdariffa calyx extract
- IBMX :
-
3-isobutyl-l-methyl-xanthine
- L-NAME :
-
Nω-Nitro-L-arginine methyl ester hydrochloride
- ON :
-
nitric oxide
- ODQ :
-
1H-[1,2,4]Oxadiazolo[4,3-a]quinoxalin-1-one
- PE :
-
Phenylephrine
- PDB :
-
Protein data bank
- PGI2 :
-
Prostaglandin I2
- PKA :
-
Protein kinase A
- PKC :
-
Protein kinase C
- PRP :
-
Platelet-rich plasma
- RMSD :
-
Root mean square deviations
- sGC :
-
Soluble guanylyl cyclase
- SD :
-
Standard deviations
- SDS-PAGE :
-
Sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- SEM :
-
Standard error of the mean
- TEA :
-
Tetraethylammonium
- WP :
-
Washed platelets
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Acknowledgements
The authors would like to thank the financial support of Fundect, FAPESP (D.R.S.M process number 59/300.549/2016 and C.H.L postdoc fellowship, process number 2017/26687-3), and FAPEMIG (Project 29628, APQ-01868-22 and FUNDEP Project 30201).
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This work was supported by the FAPEMIG, grant number Project 29628, APQ-01868-22.
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D.R.S.M.: Investigation, Data curation, Resources, Conceptualization, Methodology, Writing – original draft. C.H.L.: Investigation, Data curation, Resources, Conceptualization, Methodology, Writing – original draft. A.F.O.J.: Conceptualization, Methodology, Investigation. J.M.V.: Conceptualization, Methodology, Investigation. S.H.S.S.: Writing – review & editing. C.M.A.: Writing – review & editing. A.B.: Conceptualization, Writing – review & editing. I.P.O.: Methodology, Supervision, Writing – review & editing. E.J.S.A.: Supervision, Writing – review & editing.
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Martins, D.R., Lescano, C.H., Justo, A.F.O. et al. Effect of Different Extraction Methods on Anthocyanin Content in Hibiscus sabdariffa L. and their Antiplatelet and Vasorelaxant Properties. Plant Foods Hum Nutr 78, 342–350 (2023). https://doi.org/10.1007/s11130-023-01067-5
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DOI: https://doi.org/10.1007/s11130-023-01067-5