Research Paper
Ameliorative Effects of Raphanus sativus L., Nyctanthes
arbor-tristis L. and Ficus palmata Forssk. on Calcium
Oxalate Crystallization Events of Stone Formation
In Vitro
SWETA BAWARI, DEVESH TEWARI1 AND ARCHANA NEGI SAH2*
Department of Pharmacology, School of Pharmacy, Sharda University, Greater Noida, Uttar Pradesh 201310, 1Department
of Pharmacognosy, School of Pharmaceutical Sciences, Faculty of Applied Medical Sciences, Lovely Professional University, Phagwara, Punjab 144411, 2Department of Pharmaceutical Sciences, Faculty of Technology, Bhimtal Campus, Kumaun
University, Nainital, Uttarakhand 263136, India
Bawari et al.: In vitro Antiurolithiatic Activity of Plants from Western Himalaya
Study demonstrates the antiurolithiatic potential of the three important plant species of the western
Himalayan region viz. Ficus palmata fruits, Raphanus sativus leaves and Nyctanthes arbor-tristis leaves in
vitro. Nucleation, growth and aggregation assays along with microscopic analysis of calcium oxalate crystals
was employed to investigate the antilithic effect of the hydroethanolic extracts of Ficus palmata fruits,
Raphanus sativus leaves and Nyctanthes arbor-tristis leaves on crystallization events of calcium oxalate
stone formation. Fourier-transform infrared spectroscopy and high performance liquid chromatography
analysis was employed for characterizing the phytoconstituents present in the extracts. All the three plant
extracts produced inhibition of nucleation, growth and aggregation, and reduction of number and size
of calcium oxalate crystals. A favorable morphological transformation of calcium oxalate crystals was
also witnessed in the presence of the hydroethanolic extracts of Raphanus sativus and Nyctanthes arbortristis. Phytochemical investigation of the extracts revealed the presence of saponins, tannins, flavonoids
and polyphenolic compounds while Fourier transform-infrared spectroscopy and high performance
liquid chromatography analysis further substantiated the presence of polyphenolic compounds which are
known to be involved in producing the anticrystallization effect of the tested extracts. Study confirmed
that Ficus palmata fruits, Raphanus sativus leaves and Nyctanthes arbor-tristis leaves possess significant
anticrystallization activity against calcium oxalate crystals which may translate to brilliant antiurolithiatic
activity based on the effect of these extracts on various phases of urinary stone formation as witnessed in
the present study.
Key words: Catechin, caffeic acid, fourier transform-infrared spectroscopy, high performance liquid
chromatography, nucleation, aggregation, urolithiasis, urinary stones
Urolithiasis or kidney stone disease is usually described
as a disease that results from disruption of equilibrium
between promoters and inhibitors of stone formation[1].
It is an enigmatic disease with complex etiology which
is persistently on rise and has emerged as a common
yet excruciating affliction that accounts for frequent
emergency department visits[2]. Urolithiasis is known
to currently afflict approximately 12 % inhabitants
of the World’s industrialized nations[3,4]. Due to
global warming, further 10 % hike in this statistics is
anticipated within next 50 y[5]. As per the reports from
the National Health and Nutrition Examination Survey
(NHANES), prevalence of nephrolithiasis in United
States of America (USA) increased from 5.2 % to
8.8 % since the year 1998 to 2010. Similarly, prevalence
of urolithiasis in Germany increased from 4 % in
1979 to 4.7 % in 2001 and in China prevalence rate
increased from 1.5 % to 4 % from the year 1989 to
This is an open access article distributed under the terms of the Creative
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allows others to remix, tweak, and build upon the work non-commercially,
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the identical terms
Accepted 09 March 2022
Revised 19 November 2021
Received 11 November 2019
*Address for correspondence
E-mail: drarchanansah@gmail.com
March-April 2022
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[6]
2000 . India falls in the Afro-Asian stone belt of high
stone prevalence[7]. In India, urolithiasis contributes
to numerous cases of chronic renal diseases and renal
failures[8].
Calcium Oxalate (CaOx) stones have been the most
studied stone types for the last few decade[9]. The
reason being, CaOx is the most predominant chemical
entity of urinary stones[10] and is the most recurrent
type of all the stones[11]. CaOx also presents the most
challenging class of stone disease due to their majorly
idiopathic nature[12] and complex etiology[13]. Due to
this, available treatment options have not been found to
be completely effective so far[14]. Therefore, the current
study appertains to mitigating CaOx urolithiasis which
is the most prevalent of all urinary stone diseases[2].
Herbs are more like a panacea for vivid range of
afflictions and ailments. Plants continue to be a vital
part of therapeutics and medicine worldwide. An era
of renaissance of phytotherapy is being witnessed
wherein plants and phytoconstituents are increasingly
grabbing interest as a potential source of drug
discovery and development[15]. Phytoconstituents like
caffeine have been reported to prevent urolithiasis by
inducing translocation of crystal binding annexin A1
proteins from the apical surface of the renal tubular
cells to the cytoplasm[16]. Other phytoconstituents like
catechin[17], resveratrol[18], rutin, curcumin[19], quercetin
and hyperoside[20] have shown promising outcomes as
antiurolithiatic in animal models.
The Himalayan region is a treasure of biodiversity
and harbors immensely rich flora and fauna. The
present study addresses Ficus palmata Forsk.
(F. palmata) (Moraceae), Raphanus sativus L. (R. sativus)
(Cruciferae) and Nyctanthes arbor-tristis L. (N. arbortristis) (Oleaceae) of the western Himalayan region for
their antiurolithiatic activity in vitro. F. palmata or Wild
Himalayan Fig (Bedu) is an underexplored plant of
high medicinal value[21]. Contrarily, R. sativus or radish
and N. arbor-tristis or Night Jasmine (Harsingar) has
been reported for their therapeutic potential in wide
range of diseases and ailments. F. palmata possesses
reported nephroprotective activity[22] and N. arbortristis have been shown to possess diuretic activity[23].
Roots of R. sativus have been reported to be antilithic[24]
and diuretic[25]. Antioxidant property reported in all the
three plants[26-28] is a unifying feature and is of utmost
significance in context to the present study. Despite of
the indications in various nephrological disorders, none
of the selected plant parts have been evaluated for their
plausible antiurolithiatic activity. Hence, this study
288
was conducted to demonstrate the in vitro antilithic
potential of the fruits of F. palmata, leaves of R. sativus
and N. arbor-tristis. Predilection for the use of fruits
of F. palmata[29], leaves of R. sativus[30] and leaves of
N. arbor-tristis[31] is based on the traditional use of
these specified plant parts in urinary stone treatment or
as diuretics.
MATERIALS AND METHODS
Plant collection:
The plant samples of R. sativus L. and F. palmata Forsk.
were collected from Bhimtal region and N. arbor-tristis
L. were collected from Haldwani region of Uttarakhand
situated in the foothills of Himalaya. Plant specimens
were authenticated from Botanical Survey of India
(BSI), Dehradun and a voucher specimen of each
with accession number 116594, 116591 and 12611,
respectively was also deposited in the herbarium of
BSI. Leaves of R. sativus were collected in the month
of April while ripe fruits of F. palmata and leaves of
N. arbor-tristis were collected in the month of July.
Extract preparation:
The collected plant parts were dried in shade, powdered
and were subjected to extraction by cold maceration in
70 % v/v ethanol for 96 h. Marc was separated using
grade 1 Whatman filter paper and the extracts were
dried in a rotary evaporator under reduced temperature
and pressure[32-34]. Extractive yield of R. sativus Leaf
Extract (RSLE) obtained was 14.15 % and that of
F. palmata Fruit Extract (FPFE) and N. arbor-tristis
Leaf Extract (NALE) was 17.403 % and 10.62 %,
respectively.
Preliminary phytochemical evaluation:
Prepared extracts were subjected to qualitative
phytochemical screening for the presence of
phytoconstituents like carbohydrates, proteins, steroids,
alkaloids, glycosides, saponins, flavonoids, tannins and
phenolic substances[35,36].
Quantification of total phenolic and flavonoid
content:
Total Phenolic Content (TPC) of the extracts was
determined by Folin-Ciocalteau method as described
by Singleton et al. with minor modifications[37]. Briefly,
to 0.5 ml of 1 mg/ml extract, 2 ml Folin-Ciocalteau
reagent (10 %) was added followed by the addition of
2 ml sodium carbonate solution (7.5 %). The reaction
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mixture was allowed to stand at room temperature for
1 h and the absorbance was recorded at 760 nm. A
standard calibration curve for gallic acid (5-100 mg/l)
was plotted and TPC of each extract was expressed
as mg of Gallic Acid Equivalent (GAE) per g of dry
weight of extract[38].
Total Flavonoid Content (TFC) of the extracts
was determined by Aluminium Chloride (AlCl3)
colorimetric method. To 0.5 ml of 1 mg/ml extract 1.5
ml ethanol, 0.1 ml AlCl3 solution and 0.1 ml potassium
acetate solution was added followed by the addition of
3 ml distilled water. The reaction mixture was allowed
to stand at room temperature for 1 h and the absorbance
was measured at 415 nm. A standard calibration curve
for quercetin (5-100 mg/l) was plotted and TFC of each
extract was expressed as mg of Quercetin Equivalent
(QE) per g of dry weight of extract[38].
Fourier
Transform-Infrared
characterization of the extracts:
(FT-IR)
The three extracts viz. NALE, FPFE and RSLE were
characterized using PerkinElmer FT-IR by attenuated
total reflectance technique[39].
High Performance Liquid Chromatography (HPLC)
analysis of the extracts:
HPLC analysis of FPFE, NALE and RSLE was
performed by Reverse Phase High Performance Liquid
Chromatography (RP-HPLC) in Agilent 1200 series
HPLC system. HPLC was performed using Agilent
Zorbax Eclipse plus RP-C18 column (4.6×250 mm;
particle size 5 mm) at 45° with a solvent flow rate of
1.0 ml/min and injection volume of 20 μl at 254 nm
wavelength. Mobile phase consisted of water (eluent
A) and acetonitrile (eluent B). The following gradient
program was used for the separation of analytes: 0-5
min, 5 % B; 5-20 min, 10 % B; 20-25 min, 100 % B;
25-30 min 100 % B; 30-35 min, 5 % B; 35-40 min, 5
% B.
Nucleation assay:
Nucleation assay of CaOx crystallization was used
to evaluate the effect of the extracts on CaOx crystal
formation. For this, 100-1000 µg/ml concentrations of
the extracts were prepared in distilled water. To 1 ml of
each concentration of the extract was added with 3 ml
of 5 mmol/l Calcium Chloride (CaCl2) solution and 3 ml
of 7.5 mmol/l Sodium Oxalate solution (Na2C2O4), both
prepared in a Tris (Hydroxymethyl) Aminomethane
Hydrochloride (Tris-HCl) (0.05 mol/l) and Sodium
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Chloride (NaCl) (0.15 mol/l) buffer at pH 6.5. Final
solutions were vortexed and incubated at 37° for 30 min
and their Optical Density (OD) was measured using
a Shimadzu UV-1601 Ultraviolet-Visible (UV-Vis)
spectrophotometer at 620 nm wavelength. The extent of
nucleation in the presence and absence of the extracts
was determined and expressed as percent (%) inhibition
of nucleation by incorporating the recorded OD in
formula: % Inhibition=(1-ODTest/ODControl)×100[40].
Cystone (Himalaya Herbal Healthcare), a polyherbal
formulation commonly employed as a standard
substance in various antilithiatic studies[41,42] was also
evaluated in similar set up that served as standard.
Microscopic characterization:
CaOx crystals formed in metastable solutions prepared
by the addition of CaCl2 solution and Na2C2O4
solution were viewed using a Leica DM 2500 LED
microscope and their number, size and morphology was
determined[41].
Aggregation assay:
To determine the effect of the extracts on aggregation
of CaOx crystals, seed CaOx crystals were prepared by
mixing 50 mmol/l each of CaCl2 and Na2C2O4 solution.
Crystal slurry thus produced was dried and 0.8 mg/ml
solution of CaOx crystals was prepared in a Tris-HCl
(0.05 mol/l) and NaCl (0.15 mol/l) buffer (pH 6.5).
To 3 ml of CaOx solution was added 1 ml of varying
concentrations (100-1000 µg/ml) of the extracts and
Cystone and the OD of the test samples and standard
was read on UV-Vis spectrophotometer at 620 nm
wavelength after 30 min incubation at 37°. Percent
inhibition of aggregation was calculated using formula:
% Inhibition= (1-ODTest/ODControl)×100[40].
Growth assay:
Effect of the extracts on CaOx crystal growth was
determined by means of oxalate depletion assay. For
this, to 1.5 ml buffer system containing 10 mM TrisHCl and 90 mM NaCl (pH 7.4) was added 1 ml each of
CaCl2 solution (4 mM) and Na2C2O4 solution (4 mM).
Finally, 30 µl of 1.5 mg/ml CaOx crystal slurry prepared
in 50 mM sodium acetate buffer (pH 5.7) was added
and depletion of oxalate from the solution was recorded
over a period of 600 s at 214 nm wavelength on a UVVis spectrophotometer as a measure of CaOx crystal
growth. Growth inhibitory effect of the extracts and
Cystone was then recorded at varying concentrations
(100 µg/ml, 500 µg/ml and 1000 µg/ml) by addition
of 1 ml solution of the extracts. Difference in the rate
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of oxalate depletion before and after the addition of
the extracts was taken into account and expressed as
percent inhibition of growth by using formula: %
Inhibition=(1-ODTest/ODControl)×100[43].
Statistical analysis:
Quantitative data was expressed as mean±Standard
Error of Mean (SEM). Statistical computations and
analysis of the data were performed using one way
Analysis of Variance (ANOVA) followed by TukeyKramer’s multiple comparison test with the help of
GraphPad Prism 6 software, p values less than 0.05
were considered statistically significant.
RESULTS AND DISCUSSION
Presence of carbohydrates, steroids, saponins,
flavonoids, tannins and phenols was confirmed in
all the three extracts while alkaloids and glycosides
were also detected in RSLE in addition to the other
phytoconstituents.
Substantial amount of phenols and flavonoids were
confirmed in all the evaluated plant extracts. Among
the three extracts, highest concentration of phenolic
compounds was recorded for NALE followed by
RALE and FPFE. Highest amount of flavonoid content
was present in RSLE followed by NALE and FPFE
(Table 1).
FT-IR spectrum of RSLE (fig. 1C) showed the presence
of O-H stretching band at 3265.74 cm-1, C-H stretching
at 2929.11 cm-1 and -NH bending and -CH3 bending
at 1586.48 cm-1 and 1392.68 cm-1, respectively,
representative of primary amines. A sharp peak at
1054.79 cm-1 may be due to C-O stretching vibration
for alcohols or phenols or may be due to C-N stretching
vibration for amines.
HPLC analysis of FPFE (fig. 2A) showed the presence
of 9 compounds three of which correlated to gallic acid
(Retention Time (Rt): 6.416 min), 1,3-O-caffeoylquinic
acid (Rt: 12.743 min) and epicatechin (Rt: 22.584 min)
were found similar to that reported in earlier studies[45,46].
TABLE 1: TOTAL PHENOLIC AND FLAVONOID
CONTENT OF THE HYDROETHANOLIC EXTRACTS
Extract
TPC (mg GAE/g extract) TFC (mg QE/g extract)
FPFE
2.069±0.008
RSLE
3.359±0.014
2.72±0.022
NALE
3.504±0.137
2.036±0.016
Note: All data are presented as mean±SEM (n=3); GAE: Gallic acid
equivalent; QE: Quercetin equivalent
The FT-IR spectrum of FPFE (fig. 1A) showed a
characteristic broad O-H stretching band at 3271.21
cm-1, C-H stretching band at 2933.23 cm-1, a band at
1633.31 cm-1 due to C=C stretching vibration of alkene
or probably due to –NHCO amide group. A sharp peak
at 1029.15 cm-1 may be due to the C-O stretching.
FT-IR spectrum of NALE (fig. 1B) showed a broad
peak at 3281.41 cm-1 corresponding to the O-H
stretching band, C-H stretching at 2935.79 cm-1, strong
peak at 1697.84 cm-1 due to amide C=O stretching,
-NH stretching vibration at 1440.98 cm-1, -CH3 bending
at 1371 cm-1 and a peak at 1277.89 cm-1 probably
due to C-O of polyols. Two sharp peaks at 1074.41
cm-1 and 1018.39 cm-1 may be due to C-O stretching
vibrations and secondary alcohols or due to C-N stretch
of amines. A band at 1515.23 cm-1 probably be due to
C=C stretching of aromatic ring. Moreover, peaks at
3281.41, 2935.79, 1697.84, 1630.91, 1515.23, 1440.98,
1277.89, 1074.41, 951.49, 882.59, 814.89 and 767.27
cm-1 correspond to that of arbortristoside B has been
found to be similar to that reported by Purushothaman
et al.[44].
290
1.413±0.018
(A)
(B)
(C)
Fig. 1: FT-IR spectra of the extracts, (A) FPFE; (B) NALE and
(C) RSLE
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(A)
(B)
(C)
Fig. 2: HPLC chromatogram of the extracts, (A) FPFE; (B) NALE and (C) RSLE
HPLC chromatogram of NALE (fig. 2B) showed the
presence of 19 compounds. Four of these compounds
correlated to gallic acid (Rt: 6.442 min), chlorogenic
acid (Rt: 7.945 min) and iridoid glycosides (Rt: 15.319
and 18.67 min) as previously reported[47,48].
HPLC analysis of RSLE (fig. 2C) showed the presence
of 10 compounds two of which is correlated to catechin
(Rt: 12.989 min) and caffeic acid (Rt: 13.984 min) as
in previous studies[5,49]. Marker compounds were not
estimated in the extracts, which is the limitation of the
study.
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A concentration dependent rise in the reduction of
CaOx crystallization was witnessed with all the three
extracts and Cystone. RSLE showed significantly better
outcomes in inhibiting nucleation of CaOx crystals as
compared to Cystone at higher concentrations i.e. 800
µg/ml (p<0.05) and 1000 µg/ml (p<0.01) followed by
FPFE and NALE. Percent inhibition of nucleation at
highest concentration (1000 µg/ml) was recorded to be
60.14 %±3.57 % for RSLE, 47.33 %±3.25 % for FPFE,
47.12 %±2.74 % for NALE and 41.67 %±0.72 % for
Cystone (fig. 3).
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comparable to that of Cystone (57.15 %±2.53 %).
Percent inhibition of aggregation for FPFE and RSLE
was recorded as 50.17 %±2.059 % and 46.85 %±2.12
%, respectively (fig. 10).
Fig. 3: Effect of the extracts and Cystone on nucleation of
CaOx crystals. Values are expressed as mean±SEM; *p<0.05,
**p<0.01, ***p<0.001; awhen compared to Cystone; bwhen
compared to N. arbor-tristis, (
) Cystone; (
) F. palmata;
(
) R. sativus and (
) N. arbor-tristis
Microscopic evaluation of CaOx crystals revealed
the beneficial outcomes of NALE, RSLE and FPFE
in reducing the crystal abundance and size. When
compared to the standard drug Cystone, the extracts
were more effective in reducing the number of crystals,
whereas Cystone produced a more pronounced effect
in reducing the size of CaOx crystals (70.1 %). Of the
three extracts, NALE (1000 µg/ml) produced highest
percent reduction of the size of crystals (55.58 %),
followed by RSLE (49.49 %) and FPFE (33.13 %)
(fig. 4). Whereas, RSLE (1000 µg/ml) produced highest
percent reduction of the number of crystals (84.75 %),
followed by FPFE (69.14 %), NALE (68.83 %) and
Cystone (58.52 %) (fig. 5).
CaOx crystals in control group majorly exhibited
monoclinic or rectangular habit characteristic of
Calcium Oxalate Monohydrate (COM) crystals.
Calcium Oxalate Dihydrate (COD) crystals that were
present in the control group were few in number and that
too with sharp edges. A morphological transformation
of crystals from COM to tetragonal bipyramidal COD
crystals with smooth surface and edges was witnessed
in the presence of the extracts and Cystone. This effect
was most prominent with RSLE (fig. 6) that produced
favorable morphological change in majority of crystals
at lowest concentration itself similar to that of Cystone
(fig. 7). NALE promoted COD crystal formation at 600
µg/ml concentration and above (fig. 8). This effect on
CaOx crystal morphology was less apparent with FPFE
(fig. 9).
A concentration dependent increase in reducing CaOx
aggregation was witnessed with all the three extracts
and Cystone. NALE showed highest percent inhibition
of aggregation viz. 55.83 %±1.56% at 1000 µg/ml
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Concentration dependent inhibition of CaOx crystal
growth was observed for all the extracts and Cystone.
Percent inhibition of growth recorded for NALE was
51.79 %±4.05 %, for RSLE was 44.12 %±3.9 %, for
FPFE was 39.35 %±4.7 % and for Cystone was 57.44
%±3.74%. Growth inhibitory efficacy of FPFE at
highest concentration was found to be significantly
(p<0.05) less than that of Cystone (fig. 11).
CaOx urolithiasis was addressed in the present study as
it is the most challenging type of urolithiasis due to its
majorly idiopathic nature[12] and complex etiology[13].
It also presents the most prevalent and recurrent class
among all the urinary stone diseases[50].
Nucleation, growth and aggregation are key events
among the myriad of steps involved in stone formation.
Fig. 4: Effect of the extracts and Cystone on size of CaOx
crystals, (
) Cystone; (
) F. palmata; (
) R. sativus and
(
) N. arbor-tristis
Fig. 5: Effect of the extracts and Cystone on number of CaOx
crystals, (
) Cystone; (
) F. palmata; (
)R. sativus and
(
) N. arbor-tristis
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Fig. 6: Representative photographs of CaOx crystals from in vitro crystallization experiment as observed under light microscope
(1000×), (A) In the absence; (B) In the presence of RSLE 100 µg/ml; (C) 200 µg/ml; (D) 400 µg/ml; (E) 600 µg/ml; (F) 800 µg/ml and
(G) 1000 µg/ml
Fig. 7: Representative photographs of CaOx crystals from in vitro crystallization experiment as observed under light microscope
(1000×), (A) In the absence; (B) In the presence of Cystone 100 µg/ml; (C) 200 µg/ml; (D) 400 µg/ml; (E) 600 µg/ml; (F) 800 µg/ml
and (G) 1000 µg/ml
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Fig. 8: Representative photographs of CaOx crystals from in vitro crystallization experiment as observed under light microscope
(1000×), (A) In the absence; (B) In the presence of NALE 100 µg/ml; (C) 200 µg/ml; (D) 400 µg/ml; (E) 600 µg/ml; (F) 800 µg/ml
and (G) 1000 µg/ml
Fig. 9: Representative photographs of CaOx crystals from in vitro crystallization experiment as observed under light microscope
(1000×), (A) In the absence; (B) In the presence of FPFE 100 µg/ml; (C) 200 µg/ml; (D) 400 µg/ml; (E) 600 µg/ml; (F) 800 µg/ml and
(G) 1000 µg/ml
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Fig. 10: Effect of the extracts and Cystone on aggregation
of CaOx crystals. Values are expressed as mean±SEM,
(
) Cystone; (
) F. palmata; (
) R. sativus and
(
) N. arbor-tristis
Fig. 11: Effect of the extracts and Cystone on growth of
CaOx crystals. Values are expressed as mean±SEM; *p<0.05,
**p<0.01, ***p<0.001; awhen compared to Cystone; bwhen
) Cystone; (
) F. palmata;
compared to N. arbor-tristis, (
(
) R. sativus and (
) N. arbor-tristis
Hence, any alteration in the course of these events
brought about by synthetic or natural substances can
promote or inhibit calculi formation[51]. Nucleation,
growth and aggregation assays that were used in the
present study for evaluating the antiurolithiatic efficacy
of the plant extracts are principally simulation of the
crucial predisposing factors for CaOx stone formation
inside the body. OD of the turbid solutions produced
as a result of the formation of CaOx crystals on
combining CaCl2 and Na2C2O4 solutions was measured
spectrophotometrically as OD is directly proportional
to turbidity (τ). This inference has been made from the
expression τ=2.303 (OD/l) that was first devised by
Melik and Fogler in the year 1983. In the expression ‘l’
stands for the path length[52].
Nucleation is a preliminary event that marks
the process of spontaneous crystallization in a
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supersaturated solution. It also serves as a prerequisite
to the crystallization and stone forming events that
follow[51]. Henceforth, inhibition of nucleation can
play a significant role in inhibiting stone formation.
Present study showed beneficial outcomes of RSLE,
NALE and FPFE in inhibiting nucleation of CaOx
crystals which was even better than that of Cystone.
This was also supported by the microscopic studies of
the metastable solutions of CaOx crystals that showed
fewer crystals in the presence of these extracts. This
clearly reveals the ability of these extracts to form
complex with calcium and oxalate ions which would
have served as a possible mechanism to reduce relative
supersaturation with respect to CaOx and thus inhibit
CaOx crystallization. Similar mechanism has been
reported for anticrystallization activity of Sarghassum
wightti by Sujatha et al.[53]. Moreover, phytochemical
investigation of the three extracts revealed the
presence of tannins which are known to aid in calcium
complexation and thus inhibit CaOx crystallization[54].
Since the FT-IR analysis of RSLE, FPFE and NALE
showed the presence of O-H, C-N and -NHCO groups
that are anionic in nature, it can be alleged that calcium
complexation by these extracts would have been the
more effective mechanism involved in reducing CaOx
supersaturation[55].
Crystal growth is suggestive of increase in the dimensions
of the crystals as a result of the deposition of atoms and
molecules over the existing crystal lattice[56]. Size of the
crystals is a crucial determinant of stone formation as
large crystals pose a risk of occlusion and retention while
smaller crystals spontaneously excrete out in urine[57].
In the present study RSLE, NALE and FPFE showed
promising potential in CaOx crystal growth inhibition.
This growth inhibitory effect of RSLE, NALE and FPFE
was also evident from the smaller crystals produced in
the presence of these extracts as conferred from the
microscopic investigation. The growth inhibitory effect
of the extracts may have resulted from adsorption of
the phytoconstituents over the crystal surface that may
have hindered the addition of cations and anions to the
crystal lattice thus interfering with the growth of the
crystals[58,59].
Crystal aggregation is the key determinant of stone
formation process, as it accounts for crystal retention.
Aggregation of crystals suggests clustering of numerous
crystals to acquire enormous size. Crystal aggregates
are a common finding in urolithiatic urine and in CaOx
stone matrix[56]. In the present study RSLE, NALE
and FPFE showed promising potential in inhibiting
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CaOx crystal aggregation. The antiaggregatory effect
of the extracts would have been the consequence of
the adsorption of the various phytoconstituents of
the extracts over the CaOx crystal surface. Thereby,
raising the zeta potential of the crystals rendering
them more electronegative, thus hindering crystalcrystal interaction[60] by overcoming Van der Waals
attraction force that hold the crystals together into
aggregates[61]. This seems to be fairly possible as
presence of numerous anionic moieties was confirmed
through FT-IR analysis of the extracts that can impart
negative charge to the crystals. Phytochemical analysis
also revealed the presence of saponins and flavonoids
in RSLE, NALE and FPFE. Flavonoids and saponins
are known to induce disintegration and dissolution of
CaOx crystals[62].
Polymorphic forms of CaOx crystals have a remarkable
impact in the course of disease progression of
urolithiasis. As compared to the COM crystals, COD
crystals are less injurious to the renal epithelial cells.
This is due to their reduced adhesive ability that deters
their attachment to the renal epithelium as well as hinders
their agglomeration[30]. Therefore, transformation of
COM crystals to COD crystals that was witnessed in
the presence of RSLE and NALE shows their immense
potential as possible candidate for drug development for
urolithiasis. These observations are in agreement with
those reported for Herniaria hirsuta[57] and Holarrhena
antidysenterica[30].
The IR spectra of FPFE, NALE and RSLE showed the
presence of functional groups which are characteristic
of phenolic compounds, carboxylic acids, amines[63],
flavonoids and amino acids[64]. Moreover, peaks in
FT-IR spectra of NALE indicated the presence of
arbortristoside B, an iridoid glycoside[44].
HPLC analysis of FPFE showed the presence of gallic
acid, 1,3-O-caffeoylquinic acid and epicatechin, that of
NALE showed the presence of gallic acid, chlorogenic
acid and iridoid glycosides, and HPLC chromatogram of
RSLE showed the presence of catechin and caffeic acid.
These polyphenolic compounds present in the extracts
are of added advantage. They possess antioxidant
activity which by inhibiting oxidation mediated renal
tissue damage prevent crystal-cell interaction of CaOx
crystals with the renal tissue and thus prevent further
disease progression[3]. Chlorogenic acid, caffeic acid
and gallic acid present in NALE, RSLE and FPFE,
respectively have been reported to be strong iron
chelators and hence possess strong ability to inhibit free
radical generation and lipid peroxidation[65]. Moreover,
296
chlorogenic acid[66], catechin[67] and caffeic acid found to
be present in NALE and RSLE, respectively also possess
anti-inflammatory
activity[68].
Anti-inflammatory
activity of these polyphenolic compounds may have
the significance in providing symptomatic relief in
urolithiasis[3]. Caffeic acid, chlorogenic acid[69] and
catechin have also been reported to possess Angiotensin
Converting Enzyme (ACE) inhibitory activity[70] and
therefore may prove to be efficacious in ameliorating
renal stone disease by inhibiting inflammation of renal
tissue and CaOx crystal deposition[3]. Catechin has also
been reported to possess antiurolithiatic activity against
CaOx crystallization in in vitro and in vivo models of
urolithiasis[19].
In vitro studies provide an optimum insight into the
potential activity related outcomes of the extracts or
compounds under investigation and also provide a
platform for preliminary investigations that help in
devising future studies. Present study demonstrated
promising antiurolithiatic potential of the hydroethanolic
extract of the fruits of F. palmata, leaves of N. arbortristis and R. sativus in in vitro setting of which N. arbortristis and R. sativus produced more pronounced effects
in modulating each step of CaOx crystallization. Taking
into account the effects of the lowest concentration of
the three extracts, N. arbor-tristis possessed maximum
anti-aggregatory and growth inhibitory activity against
CaOx crystallization at the lowest tested concentration
(100 µg/ml). This may have the outcome of the higher
phenolic content of the NALE (3.504±0.137 mg GAE/g
extract) as compared to RSLE and FPFE. Although, the
anticrystallization activity of FPFE tested in in vitro
settings in the present study was comparatively less
as compared to the other tested extracts, nevertheless,
F. palmata has been reported to be a plant of high use
value with analgesic activity which may prove to be
an added advantage in combating urinary stone disease
in vivo[71].
Findings of the present study demonstrated the
efficacy of R. sativus leaves, F. palmata fruits and
N. arbor-tristis leaves in favorably modulating
nucleation, growth and aggregation phases of CaOx
crystallization events of stone formation in in vitro
settings. Prominent advocation of COD crystallization
and suppression of COM crystal formation was
witnessed in the presence of R. sativus leaves and N.
arbor-tristis leaves. All these effects can be attributed
to the saponins, tannins, flavonoids and polyphenolic
principles of the tested extracts, and to the ability of
the extracts to raise the zeta potential of the CaOx
Indian Journal of Pharmaceutical Sciences
March-April 2022
www.ijpsonline.com
crystals to inhibit attachment of ionic entities to
growing crystal lattice and crystal-crystal interaction.
Further exploration of the antiurolithiatic potential of
these plant extracts in preclinical and clinical settings
and characterization of the active constituents may
lead to the development of new plant based molecules
or products for the treatment and prevention of
urolithiasis. R. sativus leaves are widely grown and
consumed worldwide and hence can be a solution to the
enigmatic recurrence of the urinary stone disease in the
afflicted individuals in form of a common consumable
house hold commodity.
9.
10.
11.
12.
13.
Acknowledgements:
14.
First author is thankful to the Department of Science and
Technology (Innovation in Science Pursuit for Inspired
Research (INSPIRE) program, [Grant number DST/
INSPIRE Fellowship/2014/IF140276]), Government
of India, for providing financial assistance to carry out
the related research work. The authors are also thankful
to Mr. B. K. Singh, Associate Professor, Department
of Pharmaceutical Sciences, Kumaun University,
Nainital and Dr. L.S. Rautela, Laboratory Technician,
Department of Pharmaceutical Sciences, Kumaun
University, Nainital for their undeniable support and
for providing amenities to carry out the research work.
15.
Conflict of interests:
16.
17.
18.
19.
The authors declared no conflict of interest.
20.
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