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Flavonoids of Cynara scolymus possess potent xanthinoxidase inhibitory activity in vitro but are devoid of hypouricemic effects in rats after oral application.
Planta Med. 2008 Feb; 74(3):221-7.PM

Abstract

Artichoke (Cynara scolymus L.) leaves have been historically used for the treatment of hyperuricemia and gout, however whether artichoke is truly efficacious for this indication, is still a matter of debate. Thus, the goal of the present study was first to examine the xanthine oxidase (XO) inhibitory activity of an artichoke leaf extract (ALE) and some of its main compounds in vitro and then further test potentially active substances for possible hypouricemic effects using an in vivo rat model. The in vitro study showed that ALE inhibited XO with only minimal inhibitory action (< 5 %) at 100 microg/mL. However, when selected compounds were tested, the caffeic acid derivatives revealed a weak XO inhibitory effect with IC (50) > 100 microM. From the tested flavones the aglycone luteolin potently inhibited XO with an IC (50) value of 1.49 microM. Luteolin 7-O-glucoside and luteolin 7-O-glucuronide showed lower XO inhibition activities with IC (50) values of 19.90 microM and 20.24 microM, respectively. However, oral administration of an aqueous ALE, luteolin, and luteolin 7-O-glucoside did not produce any observable hypouricemic effects after acute oral treatment in potassium oxonate-treated rats. After intraperitoneal injection of luteolin a decrease in uric acid levels was detected suggesting that the hypouricemic effects of luteolin are due to its original form rather than its metabolites produced by the gut flora. In conclusion, an aqueous ALE, caffeic acid derivatives and flavones exerted XO inhibitory effects in vitro but a hypouricemic activity could not be confirmed after oral administration.

Authors+Show Affiliations

College of Pharmacy, Department of Pharmaceutics, University of Florida, Gainesville, FL 32610, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18300193

Citation

Sarawek, Sasiporn, et al. "Flavonoids of Cynara Scolymus Possess Potent Xanthinoxidase Inhibitory Activity in Vitro but Are Devoid of Hypouricemic Effects in Rats After Oral Application." Planta Medica, vol. 74, no. 3, 2008, pp. 221-7.
Sarawek S, Feistel B, Pischel I, et al. Flavonoids of Cynara scolymus possess potent xanthinoxidase inhibitory activity in vitro but are devoid of hypouricemic effects in rats after oral application. Planta Med. 2008;74(3):221-7.
Sarawek, S., Feistel, B., Pischel, I., & Butterweck, V. (2008). Flavonoids of Cynara scolymus possess potent xanthinoxidase inhibitory activity in vitro but are devoid of hypouricemic effects in rats after oral application. Planta Medica, 74(3), 221-7. https://doi.org/10.1055/s-2008-1034316
Sarawek S, et al. Flavonoids of Cynara Scolymus Possess Potent Xanthinoxidase Inhibitory Activity in Vitro but Are Devoid of Hypouricemic Effects in Rats After Oral Application. Planta Med. 2008;74(3):221-7. PubMed PMID: 18300193.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Flavonoids of Cynara scolymus possess potent xanthinoxidase inhibitory activity in vitro but are devoid of hypouricemic effects in rats after oral application. AU - Sarawek,Sasiporn, AU - Feistel,Bjoern, AU - Pischel,Ivo, AU - Butterweck,Veronika, Y1 - 2008/02/26/ PY - 2008/2/27/pubmed PY - 2008/7/22/medline PY - 2008/2/27/entrez SP - 221 EP - 7 JF - Planta medica JO - Planta Med. VL - 74 IS - 3 N2 - Artichoke (Cynara scolymus L.) leaves have been historically used for the treatment of hyperuricemia and gout, however whether artichoke is truly efficacious for this indication, is still a matter of debate. Thus, the goal of the present study was first to examine the xanthine oxidase (XO) inhibitory activity of an artichoke leaf extract (ALE) and some of its main compounds in vitro and then further test potentially active substances for possible hypouricemic effects using an in vivo rat model. The in vitro study showed that ALE inhibited XO with only minimal inhibitory action (< 5 %) at 100 microg/mL. However, when selected compounds were tested, the caffeic acid derivatives revealed a weak XO inhibitory effect with IC (50) > 100 microM. From the tested flavones the aglycone luteolin potently inhibited XO with an IC (50) value of 1.49 microM. Luteolin 7-O-glucoside and luteolin 7-O-glucuronide showed lower XO inhibition activities with IC (50) values of 19.90 microM and 20.24 microM, respectively. However, oral administration of an aqueous ALE, luteolin, and luteolin 7-O-glucoside did not produce any observable hypouricemic effects after acute oral treatment in potassium oxonate-treated rats. After intraperitoneal injection of luteolin a decrease in uric acid levels was detected suggesting that the hypouricemic effects of luteolin are due to its original form rather than its metabolites produced by the gut flora. In conclusion, an aqueous ALE, caffeic acid derivatives and flavones exerted XO inhibitory effects in vitro but a hypouricemic activity could not be confirmed after oral administration. SN - 0032-0943 UR - https://www.unboundmedicine.com/medline/citation/18300193/Flavonoids_of_Cynara_scolymus_possess_potent_xanthinoxidase_inhibitory_activity_in_vitro_but_are_devoid_of_hypouricemic_effects_in_rats_after_oral_application_ L2 - http://www.thieme-connect.com/DOI/DOI?10.1055/s-2008-1034316 DB - PRIME DP - Unbound Medicine ER -