The Central and Peripheral effects of the methanol extract of Fadogia cienkowskii schweinf. var cienkowskii Leaves

IOSR Journal of Pharmacy and Biological Sciences (IOSR-JPBS)
e-ISSN: 2278-3008, p-ISSN:2319-7676. Volume 10, Issue 6 Ver. I (Nov - Dec. 2015), PP 06-11
www.iosrjournals.org
DOI: 10.9790/3008-10610611 www.iosrjournals.org 6 | Page
The Central and Peripheral effects of the methanol extract of
Fadogia cienkowskii schweinf. var cienkowskii Leaves
Ode O.J.1*
, Omeje J.N.2
, Nuhu U.1
, Oladele G.M.1
, Madubuike S.A. 3
1
Department of Veterinary Pharmacology & Toxicology, University of Abuja, Nigeria.
2
Department of Veterinary Medicine, University of Abuja, Nigeria.
3
Department of Veterinary Microbiology, Ahmadu Bello University (ABU), Zaria, Nigeria.
Abstract: The methanol extract of Fadogia cienkowskii schweinf. var cienkowski leaves was investigated for
central and peripherally mediated nervous effects. Oral acute toxicity studies, the effect on phenobarbitone-
induced sleeping time, local anaesthetic effects, analgesic activity using acetic acid-induced writhing response,
and muscle relaxant effects with hind limb grip reflex and inclined board tests were carried out on the methanol
extract following standard models. The extract was tolerated by the oral route up to the highest test dose of
4000 mg/kg; hence, there was no mortality or overt clinical manifestations in mice within 48 h duration of the
investigation. The test doses (100, 200 and 400 mg/kg) of the extract significantly (p<0.05) potentiated
phenobarbitone-induced mean sleeping times in mice from 552.7 ± 2 mins in the control, to 930.0 ± 4, 1009.0 ±
6, and 918.7 ± 5 mins respectively. The extract also exerted a local anaesthetic effect but with reduced potency
compared to lignocaine, the reference drug (Lignocaine =100%; 200 mg/kg extract =88.9%). Again, the leaf
extract demonstrated a dose dependent analgesic activity in reducing abdominal constrictions evoked in mice in
response to acetic acid-induced pain. The results of hind limb grip reflex and inclined board tests revealed that
the extract had no effect on muscle relaxation. Thus, the extract exhibited a central nervous-mediated
effect when phenobarbitone-induced sleeping time became prolonged, and a peripherally mediated local
anaesthetic and analgesic effects. Fadogia cienkowskii schweinf. var cienkowski leaves could be a potential
source for isolation of novel analgesic and anaesthetic agents.
Keywords: Fadogia; Lignocaine; Phenobarbitone; Analgesic; Anaesthetic
I. Introduction
The plant kingdom offers prospect as sources of various medicaments and potent chemotherapeutic
agents. Natural products from plants play a dominant role in the development of novel drug leads for the
treatment and prevention of diseases [1]. It is not an understatement to note that many available drugs are
associated with numerous adverse effects. Most anaesthetic agents are known to cause cardiovascular
depression, by effects on the myocardium and blood vessels as well as on the nervous system [2]. The
prolonged use of analgesic which is a non-selective cyclooxygenase inhibitor blocks prostaglandin and
thromboxane production with consequent side effects including gastric ulceration, coagulopathies and
sometimes renal failure in patients [3]. Some local anaeaethetics e.g. ropivacaine are also associated with
symptoms of mild neurotoxicity [4]. However, a large section of the world´s population relies on traditional
remedies to treat plethora of diseases due to their low cost, easy access and reduced side effects [5]. There is
urgent need to screen plants for more effective pharmaceuticals with high safety margin, particularly in the light
of rapid deforestation and concurrent loss of biodiversity throughout the world.
Fadogia cienkowskii schweinf. var cienkowskii (Rubiaceae), locally called ‘ufu-ewureje’ is popular
among Igede tribe of Benue State within the middle belt of, Nigeria. The leaves were highly acknowledged for
their wide therapeutic efficacy in the relief of headache, general body debility, inflammation, diarrhoea and
other ailments especially in infants. The plant is a shrub of less than 1 m high usually found in the savanna
region and found to be widely dispersed into the drier parts of tropical Africa [6]. The plant is referenced 30H
among herbarium species in the South east Dome site of the copper-cobalt belt of the Democratic Republic of
Congo and Zambia. This plant could be employed in phytoextraction, a technology of using hyper accumulator
plants to extract unwanted trace elements from the soil or mineral wastes with the aim of remediating pollution
[7].
However, there was until now, paucity of information on systematic investigation of the medicinal
properties of this plant using standard experimental models. The present study therefore sought to evaluate the
central and peripheral effects of the methanol extract as an initial step to unravel the pharmacological potentials
of this plant.

The Central and Peripheral effects of the methanol extract of Fadogia cienkowskii schweinf...
II. Materials And Methods
2.1. Selection, plant collection and identification
Selection of the plant was based on oral information from traditional healers on the wide healing
effects of Fadogia cienkowskii schweinf. var cienkowskii leaves in diverse diseases especially in children. Fresh
leaves of Fadogia were collected in March, 2015 from farm locations in Ochimode village, Oju Local
Government Area of Benue State in the middle belt of Nigeria. The leaves were duely identified to be those of
Fadogia cienkowskii schweinf. var cienkowskii by a plant taxonomist, Mr. A.O. Ozioko of the Department of
Botany, University of Nigeria, Nsukka (UNN).
2.2. Experimental Animals
Inbred albino mice of both sexes weighing 20.7- 38 g, bred in the Laboratory Animal Unit of the
Nigerian Veterinary Research Institute (NVRI), Vom, Plateau state, Nigeria were used in the experiments. Male
guinea pigs (485-614 g) source locally from Gwagwalada market were also employed in local anaesthetic
studies. The mice were kept in the same room with a temperature varying between 28 and 300
C; lighting period
was between 15 and 17 hours daily. The mice were kept in stainless steel wire mesh cages which separated
them from their faeces to prevent coprophagy. They were supplied clean drinking water and fed standard feed
(Grower mash pellets, Vital feed®
, Nigeria). Animals were allowed two weeks to acclimatize before the
commencement of the investigations. Ethical rules guiding the use of animals for experimentation were strictly
adhered to. The laboratory animals were also used in accordance with laboratory practice regulation and the
principle of laboratory animal care as documented by [8].
2.3. Reagents, chemicals and drugs
Methanol was obtained from JHD, Guangdong Guanhua Science Tech. Co. Ltd., China, Picric acid
(Lab. Tech. Chemicals, Idia), glacial acetic acid (JHD, China), Indomethacin (SJZ Chem. Pharm. Co. Ltd.,
China), Lignocaine-adrenaline (Shreechem Pharmaceuticals PVT. Ltd., Mumbai, India), Phenobarbitone
sodium (Sterop-Belgium), pancuronium (Rotex Medica Trittau,Germany) were used in the study. The solvents
used for extraction were only analar grade reagents.
2.4. Preparation and extraction of the plant material
The plant material was dried under mild sunlight, and then reduced to coarse particles with mortar and
pestle before been pulverized into fine particles using a laboratory hammer mill. A measured mass (400 g) of
the powdered leaves was exhaustively extracted by cold maceration in 80% methanol with intermittent shaking
at 2 h intervals for 48 h. The extract was filtered with Whatman filter paper size-1.0 and the filtrate concentrated
in vacuo using a vacuum rotary evaporator. The concentration and percentage yield of the extract were
determined. The extract was kept at 4 0
C in a refrigerator for use in further studies.
2.5. Acute oral toxicity studies
Acute toxicity studies were conducted using a modified method described by [9]. In the first phase of
the study, (9) matured albino mice of both sexes were marked with 10% picric acid, weighed and randomly
separated into 3 groups (A – C) of 3 rats per group. The groups were separately given increased oral doses (250;
500 and 1000) of the extract respectively. The rats were observed for signs suggestive of toxicity and death
within 24 h. In the absence of mortality, the second phase of the test commenced with a new set of mice in the
same procedure with administration of varyingly higher doses (2000; 3000 and 4000 mg/kg) of the leaf extract
to the respective groups. Observation for toxicity also lasted for 24 h. A 4th
group that received an equivalent
volume (10 ml/kg) of distilled water served as a control in both cases. All treatments were given orally by
gastric intubation. The final LD50 value was calculated as the square root of the product of the lowest lethal dose
and the highest non-lethal dose. Animals that survived were further monitored for two weeks for toxic effects.
The test was terminated after two weeks and all the animals were humanely sacrificed and postmortem
examinations carried out on them.
2.6. Pentobarbitone-induced sleeping time
The method of Perry [10] was used. Four groups consisting of 5 mice per group were randomly
selected. Group A which served as the control was injected with phenobarbitone sodium (35 mg/kg)
intraperitoneally. Groups B-C received the extract at 100, 200 and 400 mg/kg respectively, 30 min before
phenobarbitone administration. The onset of sleep (when the righting reflex was lost) and the time of awakening
(when the righting reflex was regained) were recorded. The mean sleeping times of the separate mice groups
were calculated and compared.

2.7. Local anaesthetic test
The method described by Anika and Shetty [11] was used with slight modification. The lower back of
the guinea pig was neatly shaved a day prior to the conduct of the experiment. Three different concentrations of
the extract (10, 20 and 40 mg/ml) and Lignocaine-Adrenaline (20 mg/ml) were used. The concentrations of the
extract and lignocaine were injected intradermally to form a wheal, which was outlined with a marking pen on
six different sites of the lower back. Five minutes after the injection, the sensitivity of the areas were tested by
pricking lightly with a needle six times at the site of injection. Control test was done by pricking the skin as far
away as possible from the site of the extract or lignocaine. The response at the site of injection indicated the
degree of anaesthesia, which was expressed as the number of negative responses. The test was repeated at 5 min
intervals for a period of 30 min after the injection. The total score for each wheal was added up to make the
total number of negative responses out of the 36 possible and expressed as percent (%) anaesthesia.
2.8. Analgesic study
The method of Koster et al. [12] on acetic acid writhing response in mice was applied. Twenty-five
(25) mice were randomly marked with 10% picric acid, weighed and classed into five groups (A-E). Group A
served as the negative control and was given distilled water (10 ml/kg) alone, orally, group B (positive control)
received indomethacin (10 mg/kg, p.o.) while groups C, D and E were treated with the extract at 100, 200 and
400 mg/kg, respectively. One hour after, 0.6% acetic acid was injected intraperitoneally at 10 ml/kg to each
mouse. Five (5) minutes after acetic acid administration, the number of abdominal constrictions that occur
within subsequent 20 min are counted and recorded (i.e. within 15 min).
2.9. Hind limb grip reflex
This test was conducted according to the method adopted adopted by Bolon and St. Omer [13].
Matured albino mice were weighed, marked with 10% picric acid and randomly allocated to 4 groups (A-D).
The separate experimental animal groups comprised 5 mice per group. A steel wire (26 cm long by 0.2 cm
thick) was supported between two poles. Each mouse was gripped at the base of its tail and suspended above the
wire with both paws. The mouse was lowered and when released, pulled up and grasped the wire with all the 4
paws. The maximum time allowed for this synergistic hind limb support was 15 sec. The tests were conducted
before intraperitoneal administration of distilled water (10 ml/kg) to negative control (group A) and increasing
doses (100, 200 and 400 mg/kg) of the extract to the rest of the test mice in groups B, C and D. The ‘‘fall off
time’’ when each mouse fell from the steel wire before and after treatment was noted and subsequently
compared with that of other groups.
2.10. Inclined board test
The method of Kitano et al. [14] was adopted. Briefly, a smooth surfaced board was inclined at an
angle of 35 0
C to the horizontal and each mouse was placed one after another on the board as a control before
treating with the extract. Those mice unable to stay for a minimum of 10 seconds failed the test. Three groups of
mice (B, C and D), each containing five mice, were treated with increasing doses (100, 200 and 400 mg/kg, i.p.)
of the extract while group A which served as the positive control was injected with pancuronium (0.001 ml,
i.p.). Thirty min later, each mouse was put back to the inclined board and those that could no longer stay for 10
seconds failed the test and were recorded as positive for muscle relaxation.
2.11. Statistical analysis
All data generated as experimental results were subjected to one-way analysis of variance (ANOVA)
and Duncan multiple range post hoc test. Mean group differences at p< 0.05 were considered significant.
III. Results
3.1. Extraction of the plant material
The methanol extract of Fadogia cienkowskii schweinf. var cienkowskii was brownish in colour and
odourless. The extraction process gave a yield of 12.4 % (w/w).
3.2. Acute toxicity studies on Fadogia leaf extract in rats
There were no deaths by the oral route even at the highest test dose of 4000 mg per kg body mass
within 48 h of the investigation. There were also no changes in faecal consistency or overt clinical
manifestations within the period of investigation. At post mortem, there was no observable gross lesion in the
liver, gastro-intestinal tract, spleen, heart and kidneys of the experimental rats.

3.3. Phenobarbitone-induced sleeping time.
The mean sleeping time induced in experimental mice by phenobarbitone alone was 552.7 ± 2 mins,
the extract of Fadogia leaves however, caused significant (p<0.05) increase in the sleeping time values of 930.0
± 4 , 1009.0 ± 6 , and 918.7 ± 5 mins. at 100, 200 and 400 mg/kg, respectively compared to control. There was
no significant (p>0.05) different in the mean sleeping time values of mice treated with increasing doses (100,
200 and 400 mg/kg) of the extract (Table 1).
Table 1
Effect of extract on Phenobarbitone-induced sleeping time in mice
Animal group Treatment Dose Mean sleeping time (mins)
A (Control) - - 552.7 ± 2
B Extract 100 mg/kg 930.0 ± 4*
C Extract 200 mg/kg 1009.0 ± 6*
D Extract 400mg/kg 918.7 ± 5.0*
*significant at p < 0.05
3.4. Local anaesthetic effect
The extract exerted appreciable and significant (p<0.05) local anaesthetic effect at different test doses
relative to lignocaine, the reference drug used. Lignocaine had 100% anaesthetic effect but the crude extract
produced 55.6%, 88.9% and 66.7% at 10, 20 and 40 mg/ml respectively. The extract displayed a maximal local
anaesthetic effect at the medium test concentration of 20 mg/ml (Table 2).
Table 2
Local anaesthetic effects of F. cienkowskii schweinf leaf MeOH extract in the guinea pig
TMt Conc. Mean no. of negative responses at 5 min interval. Total %Anaesthesia (mg/ml)
5 10 15 20 25 30
Lignocaine 20 6/6 6/6 6/6 6/6 6/6 6/6 36/36 100
Extract 10 1/6 5/6 4/6 2/6 6/6 2/6 20/36 55.6
Extract 20 6/6 6/6 5/6 6/6 6/6 3/6 32/36 88.9
Extract 40 4/6 1/6 6/6 6/6 3/6 4/6 24/36 66.7
TMt=Treatment, n: number of animals per treatment = 3.
3.5. Analgesic effect of the extract
The test doses (100,200 and 400 mg/kg) of the crude extract of F. cienkowskii schweinf. var
cienkowskii demonstrated a significant (p<0.05) analgesic effect in reducing the number of abdominal
constrictions evoked in mice as a response to acetic acid-induced pain. Untreated mice in the control (group A)
that were given distilled water produced 14.8 ± 4 as the mean number of abdominal constrictions relative to 7.8
± 2 with indomethacin, a popular analgesic while the extract dose dependently reduced the mean number of the
abdominal constrictions to 9.3 ± 3, 7.3 ± 2 and 3.2 ± 0.6 at 100, 200 and 400 mg/kg, respectively (Table3). The
analgesic effect of the extract was most significant (p<0.01) at 400 mg/kg when abdominal constrictions
became drastically reduced from 14.8 ± 4 in the negative control to 3.2 ± 0.6.
Table 3
Analgesic activity of the extract against acetic acid-induced writhing response in mice
Group Treatment Dose Mean no. of abdominal constrictions
A (control) Distilled water 10 ml/kg 14.8 ± 4
B Indomethacin 10 mg/kg 7.8 ± 2*
C Extract 100 mg/kg 9.3 ± 3*
D Extract 200 mg/kg 7.3 ± 2*
E Extract 400 mg/kg 3.2 ± 0.6**
n=5 mice per group; *;**significant at p<0.05; p<0.01 respectively.
3.6. Test for grip reflex
The crude extract of F. cienkowskii leaves did not exert significant (p>0.05) effect on hind limb grip
reflex in mice, not even at the highest test dose of 400 mg/kg. The display of synergistic hind limb support was
intact when treated mice pulled up and grasped the wire with all the four paws.

3.7. Inclined board experiment
Mice treated with pancuronium (0.001 ml) failed the test but all the extract-treated mice were able to
stay at leisure on the inclined plane for more than10 seconds.
IV. Discussion
The extract did not cause death or visible clinical manifestation within 48 h of the investigation even at
the highest oral test dose (4000 mg/kg), an indication that the leaf extract had a wide safety margin in the
experimental mice. The various test doses (100, 200 and 400 mg/kg) of the extract significantly (p<0.05)
potentiated phenobarbitone-induced sleeping time values in mice from 552.7 ± 2 mins in the control, to 930.0 ±
4, 1009.0 ± 6, and 918.7 ± 5 mins, respectively (Table 1). Components of the extract could mediate a central
nervous effect to induce uncounsciousness and sleep or had the ability to synergise with phenobarbitone. An
ideal general anaesthetic should induce unconsciousness, analgesia, amnesia and skeletal muscle relaxation
[15]. However, the effect of the extract at prolonging phenobarbitone-induced sleeping time in mice in this
study was not observed to be dose dependent.
The extract exerted a profound local anaesthetic effect at all the test concentrations (10, 20 and 40
mg/ml) relative to lignocaine (20 mg/ml), a reference anaesthetic agent. Lignocaine displayed 100% anaesthetic
effect but the crude extract produced 55.6%, 88.9% and 66.7% at 10, 20 and 40 mg/ml respectively (Table 2).
It is rational that the extract exhibited a reduced local anaesthetic potency compared to lignocaine due to the fact
that, the extract is crude and a mixture of impurities while lignocaine is a pure compound. Local anaesthetics
stabilize peripheral nerve cell membranes and cause a reversible loss of sensation in a localized area of the body
[16]. The extract demonstrated its maximal local anaesthetic effect at the medium test concentration of 20
mg/ml. The leaf extract induced a remarkable dose dependent analgesic activity with reduction in acetic acid-
induced abdominal constrictions in mice. Distilled water-treated mice had 14.8 ± 4 as mean number of
abdominal constrictions but indomethacin treatment was effective at reducing these constrictions to 7.8 ± 2.
The crude extract however, exerted a better efficacy in reducing the average constrictions to 9.3 ± 3, 7.3 ± 2 and
3.2 ± 0.6 at 100, 200 and 400 mg/kg, respectively (Table 3). The extract exhibited a maximal analgesic potency
at 400 mg/kg when the activity became significant (p<0.05) and greater compared to the effect of indomethacin
(10 mg/kg), a popular analgesic. Indomethacin is a non-steroidal anti-inflammatory agent as well as a non-
selective cyclooxygenase inhibitor that blocks prostaglandin biosynthesis [2]. Prostaglandins are known to
sensitize nociceptors to pain stimuli. Stimulation of nociceptors leads to release of substance P in the
neurogenic (early) phase within 5 minutes but late phase (15-30 minutes) of pain is due to release of histamine,
serotonin, bradykinin and prostaglandins [17]. The number of abdominal constrictions that occur in a mouse
five minutes after acetic acid administration is an indication of response to the severity of pain stimulus [12].
Mouse writhing assay is a test useful for evaluating mild analgesic property that suggests peripherally mediated
analgesic effect [18]. The extract could have acted peripherally to relieve acetic acid-induced pain in the
experimental mice.
The results of the hind limb grip reflex and inclined board tests revealed that the leaf extract had no
effect on muscle relaxation. This was demonstrated by the presence of intact synergistic hind limb support that
enabled extract-treated mice to pull up on release to grasp the test wire with all the four paws. In inclined board
experiment, mice treated with pancuronium (0.001 ml) failed the test due to muscular paralysis but all the
extract-treated mice stayed at leisure on the inclined plane for more than10 seconds. Pancuronium is a long
acting (90-180 min), competitive, non-depolarizing, neuromuscular relaxant similar to tubocurarine,
metocurine, doxacurium, pipecuronium, and gallamine [19].
V. Conclusion
The extract exhibited a central nervous-mediated effect in potentiating phenobarbitone-induced
sleeping time and a peripherally mediated local anaesthetic and analgesic effects. The results of the study
provide a basis for exploiting components of the extract of F. cienkowskii schweinf. var cienkowskii leaves for
anaesthetic and analgesic effects as adjuncts to complement surgical procedures.
Funding Sources
The research was sponsored out of personal savings of the authors without any external financial assistance.
Acknowledgements
The authors wish to express sincere appreciation to Mr. A.O.Ozioko of Botany Department, UNN,
Enugu State, Nigeria for identifying the plant sample used in the study. We also extend our gratitude to the
technical staff of the Department of Veterinary Pharmacology & Toxicology, University of Abuja, Nigeria for
their support throughout this investigation.

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The Central and Peripheral effects of the methanol extract of Fadogia cienkowskii schweinf. var cienkowskii Leaves