Effect of aqueous extract

JianFeng et al. BMC Complementary and Alternative Medicine 2012, 12:8
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RESEARCH ARTICLE Open Access
Effect of aqueous extract of Arctium lappa
L. (burdock) roots on the sexual behavior of
male rats
Cao JianFeng1, Zhang PengYing1,2, Xu ChengWei3, Huang TaoTao1, Bai YunGui1 and Chen KaoShan1,2*
Abstract
Background: Arctium lappa L. root has traditionally been recommended as an aphrodisiac agent. It is used to treat
impotence and sterility in China, and Native Americans included the root in herbal preparations for women in
labor. However, its use has not been scientifically validated. The present study therefore investigated the effects of
aqueous extract of Arctium lappa L. roots on sexual behavior in normal male rats.
Methods: Seventy-five albino male rats were randomly divided into five groups of 15 rats each. Rats in group 1
(control) were administered 10 mLD kg body weight distilled water (vehicle), group 2 received 60 mg/kg body
weight sildenafil citrate (Viagra), while those in groups 3, 4, and 5 were given 300, 600, and 1,200 mg/kg body
weight, respectively, of aqueous extract of Arctium lappa L. roots in the same volume. Female albino rats were
made receptive by hormonal treatment. Sexual behavior parameters in male rats were monitored on days 3, 7 and
15 by pairing with receptive females (1:3). Male serum testosterone concentrations and potency were also
determined.
Results: Oral administration of Arctium lappa L. roots extract at 600 and 1,200 mg/kg body weight significantly
increased the frequencies of mount, intromission, and ejaculation frequency (p < 0.05). The latencies of mount and
intromission were significantly reduced and ejaculation latency was prolonged. Administration of the extract also
reduced the post-ejaculatory interval. The standard drug (Viagra) was more effective than the extract. The extract
significantly increased the frequencies of all components of penile reflexes as well as serum testosterone levels,
compared with the distilled water controls.
Conclusions: The results of this study demonstrate that aqueous extract of Arctium lappa L. roots enhances sexual
behavior in male rats. The aphrodisiac effects of the plant extract may be related to the presence of flavonoids,
saponins, lignans and alkaloids, acting via a multitude of central and peripheral mechanisms. These results thus
support the traditional use of Arctium lappa L. root extract for treating impotence and sterility.
Background impotence , is the repeated inability to get or maintain a
Sexual relationships are among the most important social firm enough erection to allow sexual intercourse [2]. It
and biological relationships in human life. Male sexual often has multiple underlying causes, and it has been
dysfunction (MSD) affects not only sexual relationships, estimated that around 1 in 10 men will experience recur-
but also overall quality of life. MSD includes erectile dys- ring impotence problems at some point in their lives [3].
function (ED), ejaculation dysfunction, and hypogonad- Although ED does not affect life expectancy, it can have
ism, and represents a serious public health problem [1]. a significant negative impact on an individual s well-
ED and premature ejaculation (PE) are the two most pre- being and quality of life [4]. PE is the most common sex-
valent male sexual complaints. ED, sometimes called ual dysfunction among young men worldwide, with a
prevalence of more than 20% [5,6], and is characterized
by a short latency time and a lack of control over ejacula-
* Correspondence: ksc313@126.com
tion. In men suffering from PE, not only is the latency to
1
School of Life Sciences, Shandong University, Jinan 250100, PR China
ejaculation typically very short (e.g., 1 or 2 min or less),
Full list of author information is available at the end of the article
� 2012 Cao et al; BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution
License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium,
provided the original work is properly cited.
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but the man s perceived control of latency and the timing plant extract by investigating the effects of aqueous
of ejaculation are low or absent [7]. Experimental studies extract of Arctium lappa L. roots on sexual behavior in
have demonstrated that the motor control of ejaculation male rats.
in animals is modulated by serotonin and serotonin
receptors [8]. Animal studies have also shown that Methods
diminished serotonin neurotransmission and activation Chemicals
of 5-HT1A receptors were associated with faster ejacula- The drugs used in this study were sildenafil citrate (Via-
tion, whereas activation of 5-HT2C and 5-HT1B receptors gra) (Pfizer Inc, USA), progesterone (Ningbo, China)
delayed ejaculation [9,10]. Recent studies have indicated and estradiol (Sigma). Olive oil was from Grupo Hoji-
the beneficial effects of some serotonergic antidepres- blanca (Spain). All reagents used were of analytical
sants in delaying ejaculation, and these agents thus com- grade and were supplied by Tianjin Chemical Agent
prise the current pharmacological treatment for PE. Ltd., China.
MSD is a medical problem that affects both young and
old men, and despite advances in modern and orthodox Preparation of aqueous extract of Arctium lappa L. roots
medicines, its effective control by drugs or adjuvant Fresh Arctium lappa L. roots were washed in tap water
therapies is affected by drug efficacy and safety, as well as and air-dried in the shade. Four kilograms of roots were
cost. Continuing research is therefore needed to develop cut into small pieces and extracted with warm distilled
and investigate safe and effective new drugs for the treat- water (DW) (DW:material, 10:1, v/w) twice in an incuba-
ment of MSD. Plants are an important source of medi- tor at 80 C for 1.5 h. The hot-water extract was filtered
cines and play a key role in the health of the world s through Whatman No. 1 filter paper (Sanger Biotech,
population. The use of plant materials to treat sexual dis- Shanghai, China), and the extraction was repeated. The
orders has a long history in most countries, and plant combined filtrates were concentrated in a vacuum at 60 C,
materials have proven effective in improving sexual and the resulting filtrates were freeze-dried (Boyikang
desire and sexual behavior in male animals. For example, Refrigerated Vapor Trap, SD-1A-50) and weighed to
Hypericum perforatum [11], Senecio cardiophyllus [12], determine the yield of soluble constituents. The sample
Ginkgo biloba [13], Pausinystalia yohimbe [14], Fadogia was stored at -20 C (yield 12.2% w/w dry weight basis)
agrestis [15], Bryonia laciniosa [16], Astercantha longifo- until use.
lia [17] and Curculigo orchioides [18] have all been
reported to have sexual-function-enhancing effects in Animals
male rats. Montana tomentosa is a potent stimulator of Adult male Sprague-Dawley rats, approximately 4 months
sexual behavior, particularly sexual arousal and pro- old and weighing 230-260 g, as well as 3-month-old female
ejaculatory effects in male rats [19]. Microdesmis keayana rats weighing 220-240 g were obtained from the Animal
roots have been reported to enhance sexual behavior in Experimental Center of the College of Medicine, Shan-
male rats by increasing the production of nitric oxide dong University. The animals were housed in clean meta-
(NO) [20]. bolic cages in well-ventilated conditions (temperature 23 ą
Arctium lappa L is a traditional Chinese medicinal 2 C; photoperiod: 12 h natural light and 12 h dark; humid-
and an edible perennial plant of the family Compositae. ity: 45-50%), with free access to standard rat pellets and
It has also been used therapeutically in Europe, North water.
America and Asia for hundreds of years. The plant has
been cultivated as a vegetable in Japan for many years. Animal groups and extract administration
Arctium lappa L. root is traditionally used in herbal Seventy-five male rats were randomly divided into five
remedies to treat tonsillitis, throat pain, arthritis, rashes, groups of 15 rats each and were orally administered the
and various skin problems, and as a diuretic, diaphore- following: Group 1 (control), 10 mLD kg body weight DW;
tic, and blood purifier [21,22]. In Traditional Chinese group 2, 60 mg/kg body weight Viagra; groups 3, 4 and 5,
Medicine, Arctium lappa L. root is recommended as an 300, 600 and 1,200 mg/kg body weight, respectively, of
aphrodisiac agent, and used for the treatment of impo- Arctium lappa L. root extract.
tence and sterility, while Native Americans included the Oral administration was carried out using a metal oro-
root in herbal preparations for women in labor [23]. pharyngeal cannula. Five rats in each group were moni-
However, these claims are largely based on subjective tored for sexual behavior after their daily doses on days
opinions rather than scientific observations, and the 3, 7 and 15. The experiments on animals were conducted
effects of Arctium lappa L. root on sexual behavior have in accordance with the internationally accepted principles
not been scientifically validated. This study therefore for laboratory animal use and the experimental protocols
evaluated the potential aphrodisiac properties of this duly approved by the Institutional Ethical Committee.
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Mating behavior test procedure experiment. Group 1 represented the control group,
Male rats were trained three times with sexually recep- which received 10 ml/kg of DW orally. Groups 2-4
tive females for sexual experience. Each male rat was received the test drug orally at doses of 300, 600 and
allowed a 30-min exposure to a female rat in behavioral 1,200 mg/kg, respectively, daily for 15 days. Group 5
estrous for copulatory behavior, as described previously received Viagra orally at 60 mg/kg. The test for penile
[24,25]. The test was carried out between 19.00 and reflexes was carried out on the 15th day by partially
23.00 h under dim light. Three receptive female rats restraining the animal on its back in a glass cylinder.
were introduced to each male rat in a metabolic cage The preputial sheath was pushed behind the glans using
(48.5 cm � 33.5 cm � 22.5 cm) for 30 min (adaptation the thumb and index finger and held in this manner for
period) after drug administration. The female was made 15 min. This stimulation elicited a cluster of genital
receptive by the sequential administration of estradiol reflexes, and the frequencies of the following compo-
benzoate (10 źgD 100 g body weight) and progesterone nents of penile reflexes were recorded or calculated:
(0.5 mg/100 g body weight) by subcutaneous injections erections (E), quick flips (QF), and long flips (LF) were
at 48 h and 4 h, respectively. Male rats from each group recorded, and total penile reflexes (TPR) were deter-
were monitored for sexual behavior for a 40-min obser- mined as E + QF + LF.
vation period after their daily drug doses on days 3, 7,
and 15. The following male sexual behavior parameters Statistical analysis
were recorded or calculated after monitoring for the Results were expressed as mean ą S.D.M The significance
observation period: mount (MF) and intromission fre- of difference between the means was determined by one-
quencies (IF) (the number of mounts and intromissions way analysis of variance (ANOVA) with post hoc tests, fol-
from the time of introduction of the female until ejacu- lowed by analysis with SPSS 13.0 for Windows software.
lation), mount (ML) and intromission latencies (IL) (the Values were considered significant when p <0.05.
time interval between the introduction of the female
and the first mount or intromission by the male), ejacu- Results
lation frequency (EF), ejaculatory latency (EL) (the time The observations of sexual behavior are presented in
interval between the first intromission and ejaculation), Table 1. Treatment with aqueous extract of Arctium
and post-ejaculatory interval (PEI) (the time interval lappa L. roots at all three doses influenced the behavior
between ejaculation and the first intromission of the fol- of the treated animals in a dose-dependent manner.
lowing series). Both 600 mg/kg and 1,200 mg/kg body weight signifi-
cantly affected sexual behavior, compared with the
Determination of serum testosterone levels control.
Serum testosterone levels were determined according to Aqueous extract of Arctium lappa L. roots at all three
a previously described procedure [26]. Blood was col- doses had no significant effect on MF or IF on day 3
lected about 2 h after administration of the extract, Via- (p > 0.05), but both MF and IF were significantly
gra, or DW. Rats were bled through their cut jugular increased in these groups on days 7 and 15, compared
veins (which were slightly displaced to prevent blood with the distilled-water control (p < 0.05). Aqueous
contamination by interstitial fluid) under ether anesthe- extract of Arctium lappa L. roots at all the tested doses
sia, into clean, dry centrifuge tubes. The blood was left had no significant effect on EF in male rats on days 3
for 10 min at room temperature to clot. The tubes were and 7 (p > 0.05). However, EF was increased at day 15
then centrifuged at 3,000 rpm for 10 min using an Anke in animals treated with 600 and 1,200 mg/kg body
centrifuge (Model TGL-16 G, Shanghai, China). The weight extracts (p < 0.05). Administration of either 600
serum was aspirated with a Pasteur pipette into a clean, or 1,200 mg/kg body weight extract for 7 and 15 days
dry, sample bottle and used for testosterone assays significantly decreased both ML and IL, compared with
within 12 h of preparation. Serum hormone concentra- the distilled-water control (p < 0.05). The extract pro-
tions were determined using the Beckman Coulter duced contrasting effects on EL and PEI in the male rats.
Access 2 immunoassay system and a complete set of EL increased following a single dose of 1,200 mg/kg body
chemiluminescence reagents (Affiliated Hospital of weight, while PEI was significantly decreased at this dose
Shandong University). on day 7, compared with the distilled-water control (both
p < 0.05). Continued administration of the extract at all
Test for penile reflexes doses for 15 days decreased PEI in a dose-related man-
The effects of the test drug were studied according to ner, whereas EL was increased in a dose-related manner
the methods described by Tajuddin et al. [26,27]. Male (p < 0.05). Throughout the duration of the experiment,
animals were divided into five groups of five animals precoital sexual behavior (chasing, nosing, anogenital
each and kept singly in separate cages during the sniffing, genital grooming and attempted clasping and
Table 1 Effect of aqueous extract of burdock roots on mating behavior in male rats
Sexual- Days of treatment Mean frequency ą S.E.M.
behavior
parameters
Control Burdock extract 300 mg/kg Burdock extract 600 mg/kg Burdock extract 1,200 mg/kg Viagra (60 mg/kg)
IF 3rd day 10.6 ą 0.8 11.8 ą 1.4 12.0 ą 1.2 13.2 ą 0.9 15.00 ą 1.3*
7th day 11.4 ą 1.6 13.4 ą 1.5 15.2 ą 1.1 16.2 ą 0.8* 15.8 ą 1.6*
15th day 10.8 ą 0.9 13.8 ą 1.4 15.0 ą 1.2* 19.4 ą 0.9** 21.6 ą 1.8**
MF 3rd day 13.6 ą 0.9 14.6 ą 2.5 15.4 ą 1.3 17.0 ą 1.4 19.8 ą 1.9*
7th day 13.4 ą 1.5 17.6 ą 1.5 19.4 ą 2.1* 21.2 ą 2.5* 20.2 ą 2.0*
15th day 12.8 ą 1.1 16.6 ą 1.5 22.4 ą 1.6** 27.2 ą 2.0** 30.6 ą 2.4**
IL 3rd day 119.2 ą 9.3 117.8 ą 11.4 115.6 ą 8.7 105.0 ą 10.4 89.4 ą 5.9*
7th day 117.6 ą 7.5 104.0 ą 9.0 89.2 ą 5.1** 78.0 ą 4.5** 64.6 ą 7.1**
15th day 108.6 ą 11.9 89.8 ą 8.0 78.4 ą 3.7** 59.0 ą 5.0** 55.4 ą 4.6**
ML 3rd day 107.0 ą 5.5 96.4 ą 6.4 93.6 ą 5.2 90.2 ą 7.4 72.0 ą 5.7**
7th day 100.2 ą 4.9 84.2 ą 3.9 74.2 ą 9.1** 60.4 ą 4.3** 58.6 ą 4.2**
15th day 94.0 ą 9.6 77.6 ą 8.6 63.6 ą 2.7** 48.2 ą 3.1** 44.4 ą 2.8**
EF 3rd day 1.8 ą 0.4 2.2 ą 0.4 2.4 ą 0.6 2.8 ą 0.4 2.6 ą 0.5
7th day 2.2 ą 0.3 2.8 ą 0.6 3.0 ą 0.5 3.2 ą 0.6 3.4 ą 0.6
15th day 2.0 ą 0.3 3.0 ą 0.3 3.4 ą 0.5* 3.6 ą 0.6* 3.8 ą 0.4**
EL 3rd day 213.1 ą 15.1 215.9 ą 16.8 221.6 ą 25.0 231.2 ą 19.4 250.3 ą 13.8
7th day 220.3 ą 13.3 251.2 ą 15.1 262.3 ą 23.9 281.3 ą 20.5* 284.8 ą 24.7*
15th day 211.1 ą 13.4 260.3 ą 19.8 294.3 ą 29.7** 329.2 ą 12.4** 335.8 ą 17.7**
PEI 3rd day 414.8 ą 26.2 399.4 ą 28.1 416.5 ą 20.5 410.5 ą 30.3 353.8 ą 16.7
7th day 439.6 ą 23.5 386.6 ą 32.3 347.9 ą 26.6* 327.4 ą 23.4** 332.5 ą 21.1**
15th day 426.6 ą 39. 3 345.9 ą 28.5* 297.8 ą 17.4** 268.3 ą 21.9** 258.5 ą 19.4**
ML, mounting latency; IL, intromission latency; EL, ejaculation latency; MF, mounting frequency; IF, intromission frequency; EF, ejaculation frequency; PEI, post-ejaculatory interval. S.E.M.: mean standard error. n = 6
(number of animals in each group), significant difference from control, significance level: *p < 0.05, **p < 0.01
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mounting) was notable in the highest-extract-dose group significant decreases in ML and IL were observed in ani-
(1,200 mg/kg body weight), though the standard drug mals treated with Viagra. MF and IF are considered to be
(Viagra) was more effective than the extract. Treatment indices of libido (sexual desire) and potency, while ML
with aqueous extract of Arctium lappa L. roots at all and IL are also indicators of sexual arousal. The significant
three doses remarkably delayed EL without exerting any increases in MF and IF and the decreases in ML and IL
negative effects on other sexual behavior parameters and indicate that libido and potency were enhanced by
with no locomotor alterations throughout the observa- Arctium lappa L. root extract [28-31]. Furthermore, the
tion period. prolongation of EL by aqueous extract of Arctium lappa
Similarly, serum testosterone concentrations were sig- L. roots is an indicator of prolonged duration of coitus.
nificantly increased by the end of the experimental per- PEI is considered to be an index of potency, libido, and
iod in the 600 and 1,200 mg/kg aqueous-extract groups the rate of recovery from exhaustion after the first series
(p < 0.05, Table 2). Serum testosterone concentrations of mating. The decreased PEI observed with various doses
were also increased in the Viagra group, but this of plant extract may have been the result of enhanced
increase was not significant compared with the control. potency and libido, and/or reduced exhaustion in the first
The test for potency showed that TPRs and their com- series of matings. These observations all further support
ponents were significantly enhanced by higher doses of the role of Arctium lappa L. root extract in improving
Arctium lappa L. root extract (600 mg/kg body weight, sexual function.
p < 0.05, 1,200 mg/kg body weight, p < 0.01, Table 3). The penile erection index is important for evaluating
the effect of drug administration on erectile function
Discussion [32]. The potency test showed that the extract signifi-
This study examined the effect of aqueous extract of Arc- cantly increased the frequency of all components of the
tium lappa L. roots on male sexual competence in rats, penile reflex compared with the control group, but to a
with viagra as a positive reference drug. To the best of our lesser degree than Viagra. This indicates that the aqueous
knowledge, this is the first study to report the effects of extract of Arctium lappa L. roots also increases potency.
aqueous extract of Arctium lappa L. roots in male rodents. Treatment with all three doses of aqueous extract of
Arctium lappa L. root extract enhanced the sexual beha- Arctium lappa L. roots remarkably delayed EL, with no
vior of male rats compared with controls administered negative effect on the other parameters of sexual beha-
DW. These results scientifically support the use of vior, and with no locomotor alterations throughout the
Arctium lappa L. roots for enhancing male sexual ability. observation period. The delayed EL and increased penile
The mating behavior test revealed that aqueous extract erection in treated male rats indicated the involvement of
of Arctium lappa L. roots significantly increased MF and NO in the intervention [33]. The use of this plant during
IF, compared with the control group, though the effect labor by Native Americans suggests an oxytocic effect of
was less than that of Viagra. Aqueous extract of Arctium the plant s biologically active components. Oxytocin
lappa L. roots also caused significant reductions in ML is known to be a potent facilitator of copulatory behavior
and IL, compared with control animals, while highly in male rats, centered on ejaculatory function [34].
Table 2 Effect of administration of aqueous extract of burdock roots for 15 days on serum testosterone
concentrations
Parameter Mean frequency ą S.E.M
Control Burdock extract 300 mg/kg Burdock extract 600 mg/kg Burdock extract 1,200 mg/kg Viagra (60 mg/kg)
Testosterone 2.3 ą 0.4 3.2 ą 0.5 4.3 ą 0.5* 5.2 ą 0.5** 2.9 ą 0.6
S.E.M.: mean standard error. n = 6 (number of animals in each group), significant difference from control, significance level: *p < 0.05, **p < 0.01
Table 3 Effect of aqueous extract of burdock roots on penile reflexes (test for potency)
Parameter Mean frequency ą S.E.M.
Control Burdock extract 300 mg/kg Burdock extract 600 mg/kg Burdock extract 1,200 mg/kg Viagra (60 mg/kg)
Erection 6.6 ą 0.9 8.0 ą 1.1 10.2 ą 1.2* 11.2 ą 1.3** 12.4 ą 1.1**
Quick flips 5.2 ą 0.9 6.8 ą 0.9 8.6 ą 1.2* 9.8 ą 1.2** 11.4 ą 1.4**
Long flips 2.3 ą 0.4 3.4 ą 0.8 4.6 ą 0.8* 7.8 ą 1.1** 8.2 ą 0.9**
Total penile reflex 14.1 ą 2.2 18.2 ą 2.8 23.4 ą 3.2* 28.8 ą 3.6** 32.0 ą 3.4**
S.E.M.: mean standard error. n = 6 (number of animals in each group), significant difference from control, significance level: *p < 0.05, **p < 0.01.
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Oxytocin administration has been shown to affect the flavonoids have been implicated in altering androgen
consummatory components of masculine sexual behavior levels and may also be responsible for enhancing male
by lowering the ejaculatory threshold and dramatically sexual behavior by enhancing testosterone synthesis or
reducing EL [35]. However, the physiological mechanism by preventing its metabolic degradation [45,46].
responsible for the involvement of the oxytocinergic sys- In addition to increasing the biosynthesis and secre-
tem in promotion of sexual potency by the extract cannot tion of androgens, many bioactive components of plant
be identified based on the results of the current study. extracts also exhibit aphrodisiac activities by acting
The continued administration of various concentrations directly on the central nervous system to modulate the
of Arctium lappa L. roots extract for 15 days increased action of neurotransmitters and gonadal tissues in
hormone levels. The mean testosterone level in untreated males, or through vasodilation and the generation of
males was 2.27 ng/mL, and this was significantly increased NO, which can also change sexual behavior. Alkaloids
to 5.18 ng/ml in the group treated with the highest dose of increase the dilation of blood vessels in the sexual
extract (p < 0.01). Administration of extract increased tes- organs [20,47]. Ginseng saponin has been shown to
tosterone, indicating the involvement of the stimulation of enhance libido and copulatory performance by acting
hypothalamic-pituitary-gonadal axis, the increase in testos- directly on the central nervous system and gonadal tis-
terone might have been caused by the enhancement in the sues [48], and evidence suggests that it can facilitate
GnRH-LH signalling [36]. Testosterone is the main male penile erection by directly inducing the vasodilatation
gonadal hormone produced by the interstitial Leydig cells and relaxation of the penile corpus cavernosum via an
of the testis. In the testes, Luteinizing hormone (LH), a NO-dependent mechanism [49].
gonadotrophin, which binds to receptors on Leydig cells, Phytochemical studies indicate that Arctium lappa
stimulating synthesis and secretion of testosterone. L. root contains sterols, flavonoids, phenols, saponins,
Administration of extract increased testosterone could lignans (such as arctiin), alkaloids, sugars (polysacchar-
thus be assumed that some phytoconstituent present in ides), vitamins, tannin, minerals, lactone, polyacetylenes
the extract may possibly mimic the function of LH to sti- and amino acids [21,22,50,51]. The improvements in
mulate interstitial cells. In the complex mechanism that sexual function demonstrated in the current study
regulates copulatory behavior, an increase in testosterone might thus be due to the presence of such compounds
level has been associated with a moderate but significant in Arctium lappa L. root extracts. Further studies are
increase in sexual desire and libido [37-39]. Penile tumes- required to identify the active constituent(s) responsible
cence and rigidity, as well as the accessory muscles that for the sexual function improvement activities and the
help to provide additional penile rigidity and ejaculation, mechanisms whereby these activities are implemented.
depend on testosterone for normal sexual activity [40]. The results of the current study suggest that aqueous
Testosterone may also facilitate male sexual behavior by extract of Arctium lappa L. roots may be a promising
increasing dopamine release in the medial preoptic area new agent for the clinical treatment of MSD.
and potentiating nitrergic neurotransmission [41,42].
Increased serum testosterone levels after administration of Conclusions
Arctium lappa L. roots extract could thus be considered Overall, this study demonstrated that aqueous extract of
as one of the contributing factors responsible for the over- Arctium lappa L. roots could enhance sexual function
all increased sexual performance in the treated groups, and behavior in male rats. These results support the
especially for the lengthening of EL and increased copula- acclaimed use of this plant as an aphrodisiac in Chinese
tory ability in rats. Overall, these results suggest that folk medicine. Its aphrodisiac effect may be due to the
Arctium lappa L. roots extract might represent an inter- presence of flavonoids, saponins, lignans and alkaloids
esting alternative to serotonergic antidepressants for the acting through a multitude of central and peripheral
treatment of PE. pathways.
Studies in laboratory animals have implicated many
components of plant extracts as possible bioactive
Acknowledgements
agents responsible for increasing endogenous testoster-
This work was supported by research grant (No. 11200070613199 to
one levels and enhancing male sexual behavior. These Jianfeng Cao) from the Doctor (Ph.D.) Innovation Fund of Shandong
University (China). We would like to express our gratitude to the funding
include steroids and steroidal saponins, which may act
agency. The work was also supported by the National Glycoengineering
as intermediaries in the steroidal pathway of androgen
Research Center. The authors are grateful for the assistance of Liu Chunyan
production. Saponins may bind to hormone receptors, of Wannan Medical College, Wuhu, China. Thanks also to Dr. Edward
C. Mignot, Shandong University, for linguistic advice.
resulting in conformational changes that can enhance
the physiological functions of the hormone, or can bind
Author details
1
to enzymes involved in the synthesis of such hormones, School of Life Sciences, Shandong University, Jinan 250100, PR China.
2
National Glycoengineering Research Center, School of Life Sciences,
thus enhancing their production [43,44]. In addition,
JianFeng et al. BMC Complementary and Alternative Medicine 2012, 12:8 Page 7 of 8
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3
Shandong University, 27 shandananlu, Jinan 250100, PR China. Affiliated 19. Carro-Ju�rez M, Cervantes E, Cervantes-M�ndez M, Rodr�guez-Manzo G:
Hospital of Shandong University, Jinan 250012, PR China. Aphrodisiac properties of Montanoa tomentosa aqueous crude extract in
male rats. Pharmacol Biochem Be 2004, 78:129-134.
Authors contributions 20. Zambl� A, Sahpaz S, Brunet C, Bailleul F: Effects of Microdesmis keayana
JianFeng Cao designed the study. PengYing Zhang, ChengWei Xu, TaoTao roots on sexual behavior of male rats. Phytomedicine 2008, 8:625-629.
Huang and Yun Gui Bai participated in the statistical analysis. KaoShan Chen 21. Chan YS, Cheng LN, Wu JH, Chan E, Kwan YW, Lee SMY, Leung GPH, Yu PHF,
supervised the design of and coordinated the study. All authors read and Chan SW: A review of the pharmacological effects of Arctium lappa
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Pre-publication history
The pre-publication history for this paper can be accessed here:
http://www.biomedcentral.com/1472-6882/12/8/prepub
doi:10.1186/1472-6882-12-8
Cite this article as: JianFeng et al.: Effect of aqueous extract of Arctium
lappa L. (burdock) roots on the sexual behavior of male rats. BMC
Complementary and Alternative Medicine 2012 12:8.
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