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Revista Brasileira de Farmacognosia

Print version ISSN 0102-695XOn-line version ISSN 1981-528X

Rev. bras. farmacogn. vol.19 no.1a João Pessoa Jan./Mar. 2009

http://dx.doi.org/10.1590/S0102-695X2009000100010 

ARTIGO

 

Diuretic and hipotensive activity of aqueous extract of parsley seeds (Petroselinum sativum Hoffm.) in rats

 

Atividade diurética e hipotensora do extrato aquoso da semente de salsa (Petroselinum sativum Hoffm.) em ratos

 

 

Kleber Eduardo de CamposI, *; Ana Paula Coelho BalbiII; Maria José Queiroz de Freitas AlvesIII

IDepartamento de Ginecologia e Obstetrícia, Faculdade de Medicina de Botucatu - UNESP, Distrito de Rubião Júnior, s/n, 18618-000, Botucatu-SP, Brazil
IIInstituto de Ciências Biomédicas, Universidade Federal de Uberlândia, Avenida Pará, 1720, Umuarama, 38400-902, Uberlândia-MG, Brazil
IIIDepartamento de Fisiologia, Instituto de Biociências, Universidade Estadual Paulista Júlio de Mesquita Filho, Campus Rubião Jr, 18618-000 Botucatu-SP, Brazil

 

 


ABSTRACT

PURPOSE: the vegetal specie, Petroselinum sativum Hoff., known as parsley, is widely used in the Brazilian folk medicine as diuretic. The objective of this study is to verify if Brazilian use of parsley aqueous extract has similar effects with investigations that show a diuretic effect of P. sativum in rats.
METHODS: 19 rats were anesthetized and we cannulated the trachea, left carotid artery (for arterial pressure measurement) and urinary bladder (to collect urine). After 40 minutes of adaptive surgery conditions, anesthetized rats were administrated as related with their group: control (CON), oral administration with 1.0 mL of filtered water, and treated group (AE), oral administration with aqueous extract of seeds of parsley 20% (AE). Urine was collected three times (30 minutes each) and then this material was used for sodium and potassium determinations, to evaluate the amount excreted of these ions. Blood pressure was measured by mercury manometer for 9 times. All data were statistically evaluated.
RESULTS AND CONCLUSION: in the analyzed parameters, CON group did not show any differences; but AE group showed an increased of urinary flow and sodium and potassium amount excreted, and also decreased arterial pressure. All the parameters presented these modifications after 30 minutes of administration of AE (p<0.05). These results show that the treatment with the AE results in natriuretic and hypotensive effects in anesthetized Wistar rats, confirming the use of Brazilian population of this herb as diuretic.

Keywords: Petroselinum sativum, Umbelliferae, parsley, diuretic effect, hypotensive effects.


RESUMO

A espécie vegetal, Petroselinum sativum Hoff, conhecida como salsa, é amplamente utilizada na medicina popular brasileira como diurético. O objetivo desse estudo é verificar se o uso brasileiro do extrato aquoso da salsa tem efeitos semelhantes com investigações que mostram o efeito diurético da P. sativum em ratos.
MÉTODOS: 19 Ratos foram anestesiados e canulamos a traquéia, artéria carótida esquerda (para a medição da pressão arterial) e bexiga urinária (para coletar urina). Depois de 40 minutos para adaptação das condições cirúrgicas, ratos anestesiados foram administrados de acordo com seus grupos: controle (CON), administração oral com 1.0 mL de água filtrada, e grupo tratado (AE), administração oral com extrato aquoso de sementes de salsa 20% (AE). Urina foi coletada três vezes (de 30 em 30 minutos) e então esse material foi utilizado para determinações de sódio e potássio, para avaliar a quantidade excretada desses íons. Pressão arterial foi medida pelo manômetro de mercúrio por 9 vezes. Todos os dados foram estatisticamente avaliados.
RESULTADOS E CONCLUSÃO: nos parâmetros anestesiados, o grupo CON não mostrou nenhuma diferença; mas o grupo AE mostrou um aumento do fluxo urinário e da quantidade excretada de sódio e potássio, e também uma diminuição da pressão arterial. Todos os parâmetros apresentaram essas modificações após 30 minutos de administração do AE (p<0,05). Esses resultados mostram que o tratamento com o AE leva a efeitos natriurético e hipotensor em ratos Wistar anestesiados, confirmando o uso da população brasileira dessa erva como diurético.

Unitermos: Petroselinum sativum, Umbelliferae, salsa, efeito diurético, efeito hipotensor.


 

 

INTRODUCTION

Plants have been utilized as medicine throughout human story and probably even before humans involved, given the practice of botanical medicine by non-human animals. Among the many applications of herbs in medicine include the use of these agents to treat conditions of the urinary tract (Yarnell, 2002).

Parsley is widely used by Brazilian population, as a remedy for many different ailments (Brandão et al., 2006; Carlini et al., 2006; Oliveira et al., 2007). In addition to its recognized role as antioxidant (Fejes et al., 1998; Ozoy-Sacan et al., 2006), anti-inflammatory, calcium-channel-blocker in intestine and uterus muscle (Neuhaus-Carlisle et al., 1993), cancer preventive agent (Zheng et al., 1992) laxative properties (Kreyydieh et al., 2001), antiulcerogenic (Al-Howinry et al., 2003) and hypoglycemic (Yanardag et al., 2003; Ozoy-Sacan et al., 2006), the herb has gained also a wide reputation as a powerful diuretic in Europe (Tyler, 1993; Anderson et al., 1996), Africa (Watt & Breyer-Branddwijk 1962) and Brazil (Alzugaray & Alzugaray, 1983; Vieira, 1992).

Several data from WHO (World Health Organization) show 80% of world population has already used any plant as therapeutics. From these 80%, at least 30% utilized medicinal plants from clinical indication (Martins et al., 1992). The utilization of medicinal plants is more common in underdeveloped countries, as in Brazil (Heck et al., 2000). Brazilian science is advancing to study the medicinal plants properties, because is widely used in the population, and Brazilian flora is much diversified and also this country is known as the most active principles sources of the planet (Savastano & DiStasi, 1996; Barbosa-Filho et al., 2007, 2008; Biavatti et al., 2007; Corrêa et al., 2008; Sousa et al., 2008).

Although the scientific role of parsley in diuresis is already recognized and documented, there is no data about Brazilian culture influence of this herb in urinary tract and blood pressure. Therefore, the aim of this investigation is to study if Brazilian use of parsley aqueous extract, widely used in this country by folk medicine, has similar effects with investigations that show a diuretic effect of P. sativum in rats.

 

MATERIAL AND METHODS

Male Wistar rats weighing 230 ± 10 g were adapted in the Department of Physiology, for seven days. The rats were kept in collective cages in controlled conditions of temperature (22 ± 3 ºC), light (12 h light/dark cycle) and relative humidity (60 ± 5%). The animals were fed with laboratory chow (Purina®) and tap water ad libitum. All experimental procedures of this study were approved by the Committee of Ethics in Animal Experimentation at the Biosciences Institute - Unesp Campus de Botucatu, State of São Paulo, Brazil.

The herb used was Petroselinum sativum Hoffm., very common in Brazil. It was cultivated on autumn (n = 09) at the Department of Physiology and identified by BOTU herbarium (serial number 23134). Parsley seeds were harvested between 8:00 and 9:30 am, and the aqueous extract (AE) prepared at the beginning of each experiment: as used by related in brazilian medicine folk, AE was prepared as a tea (20 g of parsley seeds in 100 mL of boiled water, for 5 minutes) (Alzugaray & Alzugaray, 1983; Vieira, 1992).

The animals were separated into two experimental groups. In control group (CON), by intragastric way, rats (n = 10) received 1.0 mL of water; whereas in the treated group (AE), rats (n = 09) received 1.0 mL of aqueous extract of parsley, at the same administration way.

The experimental procedure was followed by protocol suggested by Malnic & Marcondes, 1986 (Malnic & Marcondes, 1986). Rats were anesthetized by i.p. injection of pentobarbital (5 mg / 100 g body weight). The animals were put in a surgery table and, the trachea and left carotid were cannulated by opening incision of the area. Another incision was prepared in the region of the bladder, so this structure was also cannulated by surgery. These cannulas were adapted in rats for better ventilation (trachea), arterial pressure measures (left carotid) and urine collect (bladder). The rats were maintained anesthetized throughout all the experiment, that is composed by three phases: adaptation, Ad (animal adaptation to experimental conditions, 40 minutes), basal, B (basal parameters evaluation, 30 minutes) and experimental, Ex (pos-treating parameters evaluation, 90 minutes). Experimental phase is also divided into three subphases (Ex1, Ex2 and Ex3, 30 minutes each) (Table 1).

Urinary volume vas collected at the end of each experimental period by bladder cannula (B, Ex1, Ex2 and Ex3). Urinary flow was calculated and the material was freezed for further sodium and potassium determinations. Arterial pressure variations (AP) were measured by left carotid cannula connected with a manometer with mercury form 10 to 10 minutes since the phase B until the end of the experiment. At the end of the experiment, all the anesthetized animals were killed (Table 1).

Sodium and potassium concentrations were evaluate by flame photometry. Sodium (Qe(Na+)) and potassium (Qe(K+)) amount excreted were calculated in uEq/min (Malnic & Marcondes, 1986). To compare AE-treated rats data with their respective control group and to compare Experimental phase with the Basal phase on the same group, the parameters were statistically evaluated using the Analysis of Variance (ANOVA) followed by Test of Multiple Comparisons of Tukey, and the limit of statistical significance was 5% (p<0.05) (Vieira, 1997).

 

RESULTS

Results are shown in Table 2, as means ± SEM, to compare all parameters in the basal and experimental phases of the same group and also to compare statistical differences of parameters of the same basal and experimental phases in different groups.

The animals of CON group did not present any significant differences in all parameters evaluated (p>0.05), but parsley AE-treated rats presented significant modifications (p<0.05) in all parameters evaluated (Ex2 and Ex3 periods), compared with CON group. Parsley increased urinary flow, Qe(Na+) and Qe(K+), and also decreased blood pressure (Table 2)

When comparing the Experimental phase with their respective Basal phase, there was statistically differences in Ex3 of all parameters of the AE group (p<0.05): parsley increased, after 1 hour of administration, urinary flow, Qe(Na+) and Qe(K+), and decreased blood pressure (Table 2).

 

DISCUSSION

No trials have definitely proven the mechanism of action of diuretic herbs in humans. The late pharmacognocist, Varro Tyler, PhD, theorized that herbs act only as aquaretics, or agents that increase water excretion without affecting renal handling of electrolytes (Tyler, 1994). Aquaretics may work by causing dilation of glomerular arterioles, thereby increasing glomerular filtration rate. Since water intake can itself have aquaretic effects, and many aquaretic herbs are taken as teas, this would partially explain variable results of clinical trials with aquaretic herbs. (Schilcher, 1987a,b). The results of this experiment do not follow aquaretic theory, because both experimental groups were orally treated with the same volume (1.0 mL).

In general, our results confirm with other experiments. Existing data do not support the aquaretic theory, however. Repeatedly, diuretic herbs have been shown to influence renal electrolyte handling, particularly sodium and potassium, and thus have diuretic activity (Pantoja et al., 2000; Yarnell, 2002; Galati et al., 2002).

Kreydiyyeh & Usta, 2002 studied two associated parsley species, Petroselinum hortense Hoffm. and Petroselinum sativum Hoffm., and these herbs leads an increase of 24-h urinary volume These results are according with our study, the Brazilian parsley (Petroselinum sativum Hoffm.) also promoted a diuretic state on the AE-treated animals.

Diuretic state can be a consequence of an increased renal sodium excretion (natriuresis). In Table 2, data showed that AE leads an increase renal excretion of sodium and water, presented on two last subphases of Experimental phase (Ex2 and Ex3). The herb may lead these alterations 30 minutes after its administration. Kreydiyyeh & Usta, 2002 showed a test with parsley extract added to a sodium-free perfusion buffer in rats. The urine flow rate was in this case, significantly higher than the one observed with the sodium-free buffer. It can suggest that parsley does not affect Na+ transport, since its effect was not dependent on its presence, or it is, it has an addition another site of action. This herb could be inhibiting sodium reabsorption through another mechanism that involves neither the Na+/H+ exchanger nor NaKCl2 transporter, leading to more sodium and consequently more water retention in the tubes.

Urinary flow is directly related with potassium secretion. The same cited study, reported by Kreyydieh & Usta (2002), shows that the diuretic effect of parsley AE treatment in rats seems thus to be mediated though a change in potassium transport. Parsley may be inhibiting potassium absorption or stimulating potassium secretion, or both, leading, in either case, to more potassium retention in the lumen of the kidney tubules and osmotic water flow (caliuresis). Like sodium results, in our experiment parsley leads a caliuresis state in 30 minutes after administration (Table 2).

This experiment also evaluated arterial pressure (AP) alterations throughout the treatment. In Table 2, parsley acted as hypotensive effect, decreasing AP on treated rats. AP control is complex and several mechanisms can influence, as neural, hormonal and renal. Kidney is known as an AP regulator organ, because it promotes water and salt excretion and so this mechanism can regulate volume and AP (Campos et al., 2005). AE treatment decreased 30% pressure levels at the end of the experiment (one hour after AE oral administration); this effect was found together with a natridiuresis effect, at the same moments of the experiment (EX2 and Ex3 subphases). Therefore, the hypotensive effect found in this experiment (Table 2) suggests, in part, that is conducted by water and salt renal excretions alterations.

Thus, it is concluded that parsley was responsible for the appearance of natridiuretic and hypotensive effect. This study confirmed the use of parsley tea as diuretic by Brazilian folk medicine, because this herb corroborates other studies, presenting renal and pressure alterations, confirming the diuretic effect in rats. Although we do not yet totally understand which active principle and its mechanism of action causes these effects, the use of animal models suggest a wide variety of possibilities. Our laboratory still investigates some renal mechanisms, for better understanding these renal and cardiovascular modifications.

 

ACKNOWLEDGEMENTS

The authors thank to Hildebrando Luiz da Silva, BOTU Herbarium, Department of Botany, and Mr. Antônio Carlos de Barros Tardivo, Laboratory of Kidney and Biomembranes, Department of Physiology for all technical assistance.

 

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Received 3 January 2009
Accepted 2 March 2009

 

 

* E-mail: kecampos@yahoo.com.br, Tel. +55-14-3811-6181

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