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Intern J Appl Res Vet Med • Vol. 15, No. 1, 2017. 19
KEY WORDS: struvite uroliths,
nutraceutical diet, botanicals
ABSTRACT
Urolithiasis accounts for 15% to 23% of
cases of feline lower urinary tract disease
(FLUTD), with struvite uroliths occurring
more frequently, followed by calcium oxa-
late, ammonium urate, cystine, and xanthine
calculi.
In this clinical evaluation, we tested the
efcacy of a commercially available nutra-
ceutical diet in 33 cats affected by struvite
uroliths.
Results clearly indicated a signicant
urine color, turbidity, pH, RBC, WBC,
weight and proteins decrease (***p < 0.001,
*p < 0.05), and a signicant decrease of
struvite uroliths in all treated cats.
The nutraceutical diet enriched by botan-
icals, such as, Hieracium pilosella, Urtica
dioica, Lespedeza spp, Vaccinium macrocar-
pon, Taraxacum ofcinale formulated with
DL-methionine, and a controlled addition of
minerals and amino acids resulted particu-
larly effective for struvite uroliths manage-
ment. This work can pave the way for a new,
safe, and long lasting natural approach to
treat struvite uroliths.
INTRODUCTION
Urolithiasis is dened as the formation of
sediment of one or more poorly soluble
urine crystalloids anywhere within the
urinary tract.1 Urolithiasis in cat accounts
for 15% to 23% of cases of FLUTD, while
only 11% are due to anatomic defects and
1% to 8% are urinary tract infections (UTI).2
The risk of renal calculi formation is 4.95%
when only one kidney is involved. This
percentage can increase up to 9%, though,
in the event of bilateral renal involvement.3
Struvite is the most frequent nd (> 50%),
followed by calcium oxalate (< 50%), am-
monium urate (1.7%), cystine (0.5%), and
xanthine (0.3%).4
In the past 20 years, we witnessed an in-
crease in the occurrence of calcium oxalate
stones compared to struvite stones.5 None-
theless, the latter have become more fre-
quent in the last 3 years (44% against 40%),
portending a possible future change in the
frequency of these types of calculi. Causes
of urolithiasis can be generally referred to
as a production of urine supersaturated for
the crystalloid components, although crystal
Nutraceutical Approach for Struvite
Uroliths Management in Cats
Sergio Canello1
Sara Centenaro2*
Gianandrea Guidetti2
1Forza10 USA Corp., Research and Development Department,
10142 Canopy Tree Ct. 32836 Orlando (FL); Tel. +1 (407) 530-6303,
email. sergio@forza10usa.com
2 SANYpet S.p.a., Research and Development Department,
Via Austria 3, Bagnoli di Sopra, 35023 Padua, Italy; Tel. +390429785401,
email. sarac@forza10.com, gianandrea@forza10.com
(*) corresponding author: Sara Centenaro, DVM, SANYpet S.p.a.,
Research and Development Department, Via Austria 3,
Bagnoli di Sopra, 35023 Padua, Italy; Tel. +390429785401, email. sarac@forza10.com
Vol. 15, No.1, 2017 • Intern J Appl Res Vet Med.
20
formation and growth can be also affected
by other factors including the frequency and
adequacy of bladder emptying; the presence
of certain mucoproteins; cellular debris or
foreign material, such as bacteria, able to
promote crystallization and formation of a
urolith nidus; the presence and balance of
various promoters; and the urine pH, whose
effect varies among different crystal types.
The most important risk factors for
struvite formation are urinary pH and urine
dilution, which will affect the concentrations
of magnesium, ammonium, and phosphate.6
Other predisposing factors for cats to de-
velop FLUTD are breed [Siamese cats have
a lower risk of incurring in FLUTD, while
Persian cats have a higher risk.7 Moreover:
• long hair cats have a higher risk than
mixed ones,8
• younger cats are more predisposed
to develop struvite stones with respect
to older cats, that are more prone to
develop calcium oxalate stones,4
• male cats are more affected than female
cats,3,4
• a low pH leads to uric acid precipita-
tion and cystine stones, while a high pH
leads to struvite, calcium carbonate and
calcium phosphate precipitation,9
• neutered males show an increased
risk for idiopathic interstitial cystitis,
urolithiasis and neoplasia, while spayed
females show an increased risk for
urocystolithiasis, urinary tract infections
and neoplasia,6,10
• prolonged periods of inactivity and life
indoors can increase of 2 to 10 times the
risk of development of FLUTD.7,8
The aim of this clinical evaluation was
to test the efcacy of a commercially avail-
able nutraceutical diet in 33 cats affected by
lower urinary tract disease exacerbated by
urolithiasis. The diet consisted in a mixed
formula based on sh proteins, rice, Hiera-
cium pilosella, Urtica dioica, Lespedeza
spp, Vaccinium macrocarpon, Taraxacum
ofcinale, DL-methionine, and an Omega3-
to-Omega6 ratio of 1:4.
Hieracium pilosella,11 Urtica
dioica,12and Taraxacum ofcinale13 (13)
have been shown to exert a diuretic ef-
fect, while Vaccinium macrocarpon14 has
been demonstrated to have antiseptic and
anti-adhesion activity. As to Lespedeza
spp, literature reports highlighted its ability
to reduce azotemia in patients with renal
failure of various types.15 Moreover Hiera-
cium pilosella is endowed with antioxidant
function16 and acts synergistically with
Urtica dioica, which is largely used for its
diuretic and antiurolithiatic activity against
ammonium chloride and calcium oxalate
renal stones.17-19
Urolithiasis incidence reduction has
been also ascribed to Taraxacum ofci-
nale due to the presence of saponins and
their urine basifying effect.20 Furthermore,
Taraxacum ofcinale has been tradition-
ally considered a natural compound able to
increase the frequency and excretion ratio of
uids.21,22
Lastly, Urtica dioica has shown antiviral
activity against infection of feline immuno-
deciency virus.23
In addition to the effects of these bo-
tanicals, the urine acidier DL-methionine
exerts an important effect in preventing and
dissolving struvite uroliths.24,25
MATERIALS AND METHODS
Thirty-three cats, 25 domestic Euro-
pean cats, 2 Persian cats, 3 Siamese cats,
3 Chartreux cats (mean age ± SEM; 5.7 ±
0.4 years and mean weight ± SEM; 5.33 ±
0.2 Kg; 64% males, 36% females) suffer-
ing from cystitis and manifesting at least
one symptom among hematuria, dysuria,
and/or stranguria, were enrolled in this
clinical evaluation. In particular, 14/33 of
cats showed dysuria and stranguria, 19/33
showed hematuria, dysuria and stranguria.
Five cats on 33 subjects presented urethral
obstruction. Cats received the nutraceutical
diet over a period of 30 days.
All animals received an antibiotic treat-
ment with enrooxacin (Baytril ® Bayer
SpA) administered according to the dosage
Intern J Appl Res Vet Med • Vol. 15, No. 1, 2017. 21
suggested on the Antimicrobial Use Guide-
lines for Treatment of Urinary Tract Dis-
ease in Dogs and Cats by the International
Society for Companion Animal Infectious
Diseases.26
The Diet
The diet fullled the recommendations for
protein as reported in Nutritional Guidelines
for complete and complementary pet food
for cats and dogs by The European Pet Food
Industry Federation. The diet was a mix of
dry kibbles and tablets composed of 60-80%
hydrolyzed protein (sh and vegetable)
and 20-40% minerals used as glidants,
added to therapeutic substances (Hieracium
pilosella 0.0749%, Urtica dioica 0.0619%,
Lespedeza spp 0.0589%, Vaccinium macro-
carpon 0.0372%, and Taraxacum ofcinale
0.0231%). The diet provided controlled
amount of minerals, in particular calcium
0.88%, phosphorus 0.79%, potassium 1%,
sodium 0.7%, magnesium 0.05%, chloride
1.3% and sulphur 0.5%, and DL-methionine
0.69% in compliance with European Direc-
tive 2008/38 on animal feeding stuffs for
particular nutritional purposes. The expected
ph value of the product was established
using a specic expression (base excess in
mmol/kg dry matter = Ca*2+Mg*2+Na+K-
(met(-)+cys)*2-P*2-Cl).27 Diet was
administered according to manufacturer
suggestions.
Urine Analysis and Clinical Evaluation
All cats received veterinary inspections
before the trial, after 15 days, and after
30 days, at the end of the trial. Urinalysis
was performed at the beginning (T0) and
at the end of the evaluation (T1). Dipstick
urinalysis was done using multistix 10 SG
(Siemens). The reagent strip contained test
pads for protein, blood, leukocyte, nitrite,
glucose, ketone, pH, urine weight, bilirubin,
and urobilinogen. Urine sediment analy-
sis was evaluated microscopically with an
Olympus 60BX polarized light microscope
(New York Microscope Company Inc,
Hicksville, NY, USA).
Urine color was graded according to
the color chart proposed by Brabson et al
(yellow = 1, peach = 2, pink = 3, red = 4,
and burgundy = 5).28 Turbidity was graded
according to the following score: 0 = limpid,
1 = partially turbid, and 2 = turbid.
Operative procedures and animal care
were performed in compliance with the na-
tional and international regulations (Italian
regulation D. Lgs. 116/1992 and European
Union regulation 86/609/EC). The recom-
mendations of the ARRIVE guidelines in
animal research were also consulted and
considered (29).
Statistical Analysis
Data were analyzed using using Prism
6 (GraphPad software, Inc., San Diego,
USA). All data are presented as the means
± standard error of the mean and were rst
checked for normality using the D’Agostino-
Pearson normality test. Differences in
proteins, blood, leukocyte, nitrites, glucose,
ketones, pH, weight, bilirubin, urobilino-
gen, color, and turbidity before (T0) and at
the end of the evaluation period (T1) were
analyzed using a paired t test. A value for p
< 0.05 was considered signicant.
RESULTS
Thirty-three cats with evident hematuria,
dysuria, and stranguria were enrolled in
the evaluation and received the nutraceuti-
cal diet enriched with Hieracium pilosella,
Urtica dioica, Lespedeza spp, Vaccinium
macrocarpon, and Taraxacum ofcinale.
No adverse effects were reported during the
evaluation. In Figure 1 the concentrations
of proteins, RBC, WBC, nitrites, glucose,
ketones, pH, weight, bilirubin, urobilinogen,
color, and turbidity values of cats before
(T0) and at the end of the evaluation period
(T1) are shown.
Urine color, turbidity, and pH signi-
cantly decreased from a T0 value of 3.62 ±
0.22 to 1.59 ± 0.08 at T1, from a T0 value
of 1.65 ± 0.09 to 0.71 ± 0.12 at T1 and from
a T0 value of 7.15 ± 0.18 to 6.23 ± 0.11 at
T1, respectively (Figures 1A-B, D, ***p
< 0.001). As to urine weight and proteins,
a signicant decrease, from a T0 value of
1037 ± 2.47 SG to 1018 ± 6.65 SG at T1 and
from a T0 value of 261.3 ± 20.00 to 234 ±
Vol. 15, No.1, 2017 • Intern J Appl Res Vet Med.
22
Figure 1. Graphical representations of urine parameters trend during the evaluation. (A)
Urine color value before and after 15 days of evaluation (***p < 0.001); (B) urine turbidity
value before and after 15 days of evaluation (***p < 0.001); (C) urine weight value before
and after 15 days of evaluation (*p < 0.05); (D) urine pH value before and after 15 days
of evaluation (***p < 0.001); (E) urine proteins concentration before and after 15 days of
evaluation (*p < 0.05); (F) red blood cells concentration before and after 15 days of evalu-
ation (***p < 0.001) and (G) white blood cells concentration before and after 15 days of
evaluation (***p < 0.001).
Intern J Appl Res Vet Med • Vol. 15, No. 1, 2017. 23
17.71 mg/dL at T1, was also observed (Fig-
ures 1C, E, *p < 0.05). Also RBC and WBC
signicantly decreased from a T0 value of
0.12 ± 0.02 mg/dL to 0.04 ± 0.008 mg/dL at
T1 and from a T0 value of 11.52 ± 0.70 mg/
dL to 9.12 ± 0.52 mg/dL at T1, respectively
(Fig 1F-G, ***p < 0.001).
Ketones, glucose, bilirubin, urobilinogen
and nitrites were not detectable before and
after the clinical evaluation. Struvite uroliths
in urine sediment showed a signicant de-
crease from T0 to the end of the evaluation
period (T1) (Figure 2).
DISCUSSION
Lower urinary tract diseases (LUTD) occur
commonly in cats and struvite urolithiasis is
present in many cats suffering LUTD. Com-
ponents of the diets have been investigated
as causative agents of struvite including ash,
magnesium,30-33 ammonium chloride,34,35
DL-methionine,24,36 calcium and sodium
carbonate,27 and dietary ber, as well as
solute (mineral and protein content) and salt
content.37,38 It is worth noting that shmeal
has been shown to have a comparable nutri-
tional value and urine acidifying effect with
respect to corn gluten meal as well as to
exert a preventive effect in constipation and
struvite urolithiasis formation.39 Moreover,
the percentages of nitrogen absorption and
retention with respect to nitrogen intake
have been observed to be higher for meat
meal while urinary pH, struvite activity
product, and number of struvite crystals in
urine were lower for corn gluten meal.40
The approach with botanicals such as
Hieracium pilosella, Urtica dioica, Les-
pedeza spp, Vaccinium macrocarpon, and
Taraxacum ofcinale resulted particularly
effective for struvite uroliths dissolution.
These botanicals seemed to act synergistical-
ly with each other and with DL-methionine
in order to reduce and restore the physi-
ological pH, thus dissolving any struvite
uroliths.17,20 Furthermore, the nutraceutical
diet was formulated respecting the correct
nutritional requirements and providing the
balanced amount of minerals and aminoac-
ids for improving pH reduction.27
Although a general recommendation for
urolithiasis prevention is to increase water
consumption in order to increase diuresis
and reduce time for aggregation and crystal-
lization, a moist diet is advisable as a syn-
ergic strategy.1 Other preventive strategies
include a low level of high quality protein
(in order to reduce excretion of urea), low
calcium, phosphorus and magnesium (in
order to reduce concentration of calculi con-
stituents), high sodium (in order to induce
a large volume of low concentration urine),
and a specic diet depending on the kind of
uroliths.
In conclusion,, this diet ensures to keep
lower levels of sodium than average and
relies on wild-caught sh bypassing the
possible risk for the cat of ingesting oxy-
tetracycline residues. In fact, meal (mainly
poultry) by-products, which is the main
ingredient of canned, semi-moist and dry
diets, usually has an important percentage
Figure. 2 Microscopic image of struvite uroliths presence in ND group. Microscope image
(60X) highlighting the (A) presence of several cristals before and (B) after the specic diet
supplementation.
Vol. 15, No.1, 2017 • Intern J Appl Res Vet Med.
24
of bone meal (20-30% v/v) (41). It has been
widely demonstrated the presence of oxy-
tetracycline in poultry bones42-44 as well as
its ability to enhance apoptosis and promote
pro-inammatory cytokines, ie, interferon-γ
release from peripheral blood mononuclear
cells cultures in vitro.45 Thus we speculate
a possible role of oxytetracycline in repre-
senting one of the triggering factors related
to the overall inammatory environment of
lower urinary tract disease.
STATEMENT OF AUTHORSHIP
The authors hereby certify that all work con-
tained in this article is original. The authors
claim full responsibility for the contents of
the article.
CONFLICT OF INTEREST
The authors conrm that they do not have
any conict of interest
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