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State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences,

Peking University, Beijing 100083, China gda5958@163.com

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Tokyo University of Pharmacy and Life Sciences, Horinouchi 1432-1, Hachioji, Tokyo 192-0392, Japan mimakiy@ps.toyaku.ac.jp

PROFESSOR STEPHEN G. PYNE Department of Chemistry University of Wollongong

Wollongong, New South Wales, 2522, Australia spyne@uow.edu.au

PROFESSOR MANFRED G. REINECKE Department of Chemistry,

Texas Christian University, Forts Worth, TX 76129, USA m.reinecke@tcu.edu

PROFESSOR WILLIAM N. SETZER Department of Chemistry

The University of Alabama in Huntsville Huntsville, AL 35809, USA

wsetzer@chemistry.uah.edu PROFESSOR YASUHIRO TEZUKA Institute of Natural Medicine

Institute of Natural Medicine, University of Toyama, 2630-Sugitani, Toyama 930-0194, Japan tezuka@inm.u-toyama.ac.jp

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Diuretic Activity of Lophophytum leandri

Antonio Bracci

a

, Anibal G. Amat

b

, Francesco Maione

c

, Carla Cicala

c

, Nicola Mascolo

c

and

Vincenzo De Feo

a

a

Dipartimento di Scienze Farmaceutiche e Biomediche, Università degli Studi di Salerno, Via Ponte don Melillo,

84084, Fisciano (Salerno), Italy

b

Facultad de Ciencias Exactas, Quimicas y Naturales, Universidad Nacional de Misiones

,

Felix de Azara 1552,

3300 Posadas, Misiones, Argentina

c

Dipartimento di Farmacologia Sperimentale, Università degli Studi di Napoli Federico II, Via D. Montesano, 49,

80131 Napoli, Italy

defeo@unisa.it

Received: July 29

th

, 2011; Accepted: December 7

th

, 2011

A bioassay-oriented study was carried-out in order to validate the traditional uses of Lophophytum leandri, a parasitic plant used as a diuretic in traditional medical practices of Argentina. Four known flavonoids have been isolated from the active fraction.. Quercetin-3-O--D-glucopyranoside was identified as the active principle of the fraction. However, the diuretic activity of the extract and of the most active fraction had greater activity than that of the pure isolated compounds.

Keywords: Lophophytum leandri, Diuretic activity, Flavonoids, Quercetin-3-O--D-glucopyranoside, Traditional plant uses.

Lophophytum leandri Eichl. (Balanophoraceae), a parasitic plant

distributed in tropical and subtropical regions of north eastern

Argentina and south eastern Brazil, grows on some Fabaceae

species {Anadenthera macrocarpa (Benth.) Brenan, Apuleia sp. and

Piptadenia rigida Benth.} [1]. In Argentina this plant is known by

the vernacular name Flor de piedra and in the regional traditional

medical practices the corm of the plant is used, in decoction or

infusion, as a diuretic and a urolythic ethnotherapeutical agent [2,3].

The presence of flavonoids has been reported in the rhizomes of

L. leandri [4,5]. The present paper reports a bioassay-oriented study

carried out to evaluate the potential diuretic activity on male Wistar

rats of an ethanol extract of the plant, a chromatographic fraction,

and pure isolated compounds.

Table 1 reports the diuretic activity of the methanol fraction of an

ethanol extract and its chromatographic fractions from L. leandri.

The whole extract showed, at the tested dose of 300 mg/kg, an

increase in the volume of urine of about 76% in comparison with

the control. The extract was administered at a dose of 300 mg/kg,

based on the dose employed in traditional medicine. Fractionation

of this extract, by gel-permeation chromatography, resulted in 8

fractions. Of these, only one, fraction IV, which represented about

one third of the weight of the extract, demonstrated an appreciable

diuretic activity, with an increase in the volume of urine of 62%.

Purification of this fraction permitted the isolation of four known

flavonoids, whose diuretic activity is presented in Table 1.

Only quercetin-3-O-glucoside (synonym isoquercitrin) showed an

increase of diuretic activity at all the doses tested. For this

compound, the diuretic activity was significant and dose-dependent,

although not comparable with the activity of hydrochlorothiazide.

Among the other isolated flavonoids, only (+)-catechin showed an

appreciable diuretic activity, at the maximum dose tested. Even

if the biological activity of the crude extract seemed to be greater

than that of its chromatographic fractions, the activity was

greater for compounds isolated from fraction IV. This allowed the

Table 1: Diuretic activity of the methanol extract, chromatographic fraction IV and pure compounds isolated from Lophophytum leandri.

Compound Dose (mg/kg) Urine excretion (mL24 h)

Control - 4.2±0.4 Methanol extract 300 7.4±0.3*** Fraction IV 100 6.8±0.4** 25 5.5±0.3* 50 6.9±0.4** Quercetin-3-O-glucoside 100 7.7±0.4*** 25 3.8±0.5 50 4.0±0.6 Rutin 100 4.2±0.6 25 4.3±0.6 50 4.9±0.8 (+)-Catechin 100 7.0±0.3*** 25 4.0±0.4 50 4.1±0.5 Naringenin 100 3.9±0.3 Hydrochlorothiazide 10 9.5±0.5*** *significant at : *P<0.05; ** P<0.01 ; ***P<0.001 Vs Control

identification of quercetin-3-O-glucoside as the main active

principle in this fraction.

Our results agree with the scarce literature data that identified

flavonoid compounds as responsible for diuretic activity in some

vegetal drugs. Quercetin-3-O-glucoside has been reported as the

diuretic principle in Tropaeolum majus L. [6] and Achyranthes

bidentata DC. [7]. Rutin and some related flavonols, found in

Sambucus nigra L. flowers, also exerted diuretic activity [8].

Mpalatinos and co-workers [9] isolated (+) catechin as one of the

hypotensive and diuretic components of Alpinia zerumbet (Pers.) B.

L. Burtt & R.M. Sm. Naringenin and silymarin have been reported

for their effects on urinary excretion of water and electrolytes in rats

[10]. Other flavonoids have also been proved to possess diuretic

activity: 7-methoxy flavonoids [11], hesperidin [12], sinensetin

and 3-hydroxy-5,6,7,4’-tetramethoxyflavone [13]. The flavonoids

isolated from Spergularia purpurea Pers. showed diuretic and

NPC Natural Product Communications

2012

Vol. 7

No. 1

33 - 34

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34 Natural Product Communications Vol. 7 (1) 2012

Bracci et al.

antihypertensive activity in both normotensive and spontaneously

hypertensive rats [14]. Recently, the anti-inflammatory and diuretic

activity of Juniperus oxycedrus L. was attributed to its flavonoid

fraction, which includes luteolin, kaemferol, quercetin, isoquercitrin

and rutin [15].

Different mechanisms have been suggested for the diuretic activity

of the flavonoids. Oral administration for 1 week produced

significant increase in water and solute renal excretion, revealing

reduction in tubular reabsorption of water and accompanying anions

[16]. Recently, 7-methoxy flavonoids have been reported as active

ligands of the adenosine A1 receptor. Among the different roles of

adenosine A1 receptor antagonists in renal protection, many studies

have shown that they can induce diuresis and sodium excretion

[11]. Although our results provide support for the traditional use of

L. leandri as a diuretic, further studies are necessary to evaluate its

safety and modes of action.

Experimental

Plant material: L. leandri was collected in June 2008 in the

Department of Candelaria (Misiones). The plant was identified by

one of us (Dr A. Amat). A voucher specimen was deposited at the

Herbarium, Department of Pharmacy, Facultad de Ciencias Exactas,

Químicas y Naturales of the National University of Misiones.

Extraction and isolation of pure compounds: The rhizome-like

corms were dried in an oven at 40°C and powdered. Five hundred g

of the powder obtained were extracted in a glass column with

ethanol at room temperature for 2 days. The extract was

concentrated in vacuo, giving 18 g of residue. This extract (9 g),

dissolved in methanol, was purified on a Sephadex LH-20 column

in 3 g aliquots, giving 96 fractions, pooled into 8 main fractions

(I-VIII) on the basis of their chemical similarity as deduced by TLC

in BAW (n-butanol-acetic acid-water, 60:25:15) and CHCl

3

-MeOH-H

2

O (80:18:2). Fraction IV, the more active in biological assays,

was purified by RP-HPLC, using a -Bondapack C

18

column. From

the active fraction, eluted with a mixture of MeOH-H

2

O (1:1), pure

rutin (57 mg) was isolated. The same fraction, eluted with a mixture

of MeOH-H

2

O (55:45), permitted the isolation of

quercetin-3-O--D

-glucopyranoside (32 mg), (+)-catechin (12 mg), and naringenin

(21 mg). The compounds were identified on the basis of their

1

H

and

13

C NMR spectroscopic data [17]. The extraction process

described above was repeated several times in order to obtain an

adequate quantity of compounds for carrying out the in vivo animal

experiments.

Animals: All animal experiments complied with the Italian

legislative decree (D.L.) no. 116 of January 27, 1992 and associated

guidelines in the European Communities Council Directive of

November 24, 1986 (86/609/ECC). The diuretic activity was

studied in male Wistar rats (180-220 g). The animals, provided by

Harlan Nossan (Chieti, Italia), were housed for 7 days under

controlled temperature (23±2°C, humidity 50±2%, and 12 h

light/dark cycles), and fed with standard pellets produced by

Mucedola Mangimi (Settimo Milanese, Italia); water at libitum. The

animals were randomly divided into groups of 6 each. One control

group was given saline (50 mL/kg) by the intraperitoneal route. The

reference drug (hydrochlorothiazide, 10 mg/kg) and the drugs under

trial were administered only once by gavage at 25, 50 and 100

mg/kg in 5 mL/kg of 10% gum arabic at T

0

. The animals were kept

in single metabolic cages for urine collection for 24 h following

drug administration.

Data analysis and statistics: All data are expressed as mean ± ES

and analyzed using one-way analysis of variance (ANOVA)

followed by either Bonferroni’s test for multiple comparisons or by

t-test when the comparison was between two means. A value of

p<0.05 was considered statistically significant.

References

[1] Hansen B. (1980) Balanophoraceae. Flora Neotropica, Monograph 23. The New York Botanical Garden, New York, 81 pp.

[2] De La Peña RM. (1997) Catálogo de nombres vulgares de la flora argentina (lista preliminar). Universidad Naciónal del Litoral, Santa Fé, Argentina, 68.

[3] Amat A, Yajía ME. (2001) Plantas vasculares utilizadas en la fitoterapia popular de la Provincia de Misiones (Argentina). In Farmacobotanica y

Farmacognosia en Argentina 1980-1998, Amat AG. (Co-ord.), Ediciones Cientificas Americanas, La Plata, Argentina, 119-152.

[4] Kloss P, (1967) Flavonoids from Lophophytum leandri. Naturwissenschaften, 54, 472.

[5] Weinges K, Kolb R, Kloss P. (1971) Phenolic natural products. XIV. Flavonols and flavonol glycosides of the rhizomes of Lophophytum leandri.

Phytochemistry, 10, 829-833.

[6] Gasparotto A Jr, Mourao Gasparotto F, Boffo MA, Botelho Lourenço EL, Alves Stefanello ME, Salvador MJ, da Silva-Santos JE, Andrade Marques MC, Leite Kassuya CA. (2011) Diuretic and potassium-sparing effect of isoquircitrin – An active flavonoid of Tropaeolum majus L.

Journal of Ethnopharmacology, 134, 210-215.

[7] Nicolov S, Thuan N, Zholjazkov V. (1996) Flavonoids from Achyranthes bidentata DC. Acta Horticulturae, 426, 75-78.

[8] Krauze-Baranowska M, Malinowska I, Glod D, Majdan M, Wilczanska A. (2009) UTLC of flavonols in Sambucus nigra flowers. Journal of Planar

Chromatography – Modern TLC, 22, 385-387.

[9] Mpalantinos MA, Soares De Moura R, Parente JP, Kuster RM. (1998) Biologically active flavonoids and kava pyrones from the aqueous extract of

Alpinia zerumbet. Phytotherapy Research, 12, 442-444.

[10] Alarcon de la Lastra C, Martin MJ, Motilva V. (1991) Effects of naringin and silymarin on urinary excretion and water and electrolytes in rats.

Phytotherapy Reseach, 5, 191-193.

[11] Yuliana ND, Khatib A, Link-Struensee AMR, Ijzerman AP, Rungkat-Zakaria F, Choi YH, Verpoorte R. (2009) Adenosine A1 receptor binding activity of methoxy flavonoids from Orthosiphon stamineus. Planta Medica, 75, 132-136.

[12] Galati EM, Trovato A, Kirjavainen S, Forestieri AM, Rossitto A, Monforte MT. (1996) Biological effects of hesperidin, a citrus flavonoid. (Note III): Antihypertensive and diuretic activity in rat. Farmaco, 51, 219-221.

[13] Schut GA, Zwaving JH. (1993) Pharmacological investigation of some lipophilic flavonoids from Orthosiphon aristatus. Fitoterapia, 64, 99-102. [14] Jouad H, Lacaille-Dubois MA, Lyoussi B, Eddouks M. (2001) Effects of the flavonoids extracted from Spergularia purpurea Pers. on arterial blood

pressure and renal function in normal and hypertensive rats. Journal of Ethnopharmacology, 76, 159-163.

[15] Dzharullaeva SS. (2009) Phytochemical investigation of Juniper rufescens leaves and fruits. Georgian Medical News, 168, 107-111.

[16] Lu GW, Mivra K, Yukimura T, Yamamoto K. (1994) Effects of extracts from Clerodendron trichotomum on blood pressure and renal functions in rats and dogs. Journal of Ethnopharmacology, 42, 77-82.

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Volume 7, Number 1

Contents

Original Paper

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A New Megastigmane Glycoside, Phoenixoside A, from Phoenix dactylifera

Sumbul Azmat, Aqib Zahoor, Rehana Ifzal, Viqar Uddin Ahmadand Faryal Vali Mohammed 3

New 3,4-Seco-ent-kaurene Dimers from Croton micans

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Esther W. Kinuthia, Moses K. Langat, Elizabeth M. Mwangi and Peter K Cheplogoi 13

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Venkata Siva Satyanarayana Kantamreddi and Colin W. Wright 19

Application of Mixture Analysis to Crude Materials from Natural Resources (III)[1]: NMR Spectral Studies to Analyze

Chalcones from Angelica keiskei

Eriko Fukuda, Masaki Baba, Yoshihiro Uesawa, Osamu Kamo, Kazunori Arifuku, Koji Tsubono and Yoshihito Okada 21 A Validated Chromatographic Method for the Determination of Flavonoids in Copaifera langsdorffii by HPLC

João Paulo B. de Sousa, Ana Paula S. Brancalion, Milton G. Júnior and Jairo K. Bastos 25

Luteolin Induces Mitochondria-dependent Apoptosis in Human Lung Adenocarcinoma Cell

Qing Chen, Shengming Liu, Jinghong Chen, Qianqian Zhang, Shijie Lin, Zhiming Chen and Jianwei Jiang 29

Diuretic Activity of Lophophytum leandri

Antonio Bracci, Anibal G. Amat, Francesco Maione, Carla Cicala, Nicola Mascolo and Vincenzo De Feo 33

Evaluation of the Hypocholesterolemic Effect and Phytochemical Screening of the Hydroethanolic Extract of

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Entisar K. Al-Hallaq, Fatma U. Afifi and Shtaywy S. Abdalla 35

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Aromatic Hydroxyl Group Plays a Critical Role in Antibacterial Activity of the Curcumin Analogues

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