Effects of Spa therapy on serum leptin and adiponectin levelsin patients with knee osteoarthritis
Antonella Fioravanti • Luca Cantarini •Maria Romana Bacarelli • Arianna de Lalla •Linda Ceccatelli • Patrizia Blardi
Received: 13 October 2009 / Accepted: 27 February 2010Ó Springer-Verlag 2010
Adipocytokine, including leptin and adiponec-
with other clinical parameters. In conclusion, our data show
tin, may play an important role in the pathophysiology of
that spa therapy can modify plasma levels of the adipocy-
osteoarthritis (OA). Spa therapy is one of the most com-
tokines leptin and adiponectin, important mediators of
monly used non-pharmacological approaches for OA, but its
cartilage metabolism. Whether this effect may play a
mechanisms of action are not completely known. The aim of
potential role in OA needs further investigations.
the present study was to assess whether spa therapy modifiedplasma levels of leptin and adiponectin in thirty patients with
Osteoarthritis Á Leptin Á Adiponectin Á
knee OA treated with a cycle of a combination of daily
locally applied mud-packs and bicarbonate–sulphate min-eral bath water. Leptin and adiponectin plasma levels wereassessed at baseline and after 2 weeks, upon completion of
the spa treatment period. The concentrations of leptin andadiponectin were measured by ELISA. At basal time,
Leptin is a peptidic molecule synthesized almost exclu-
plasma leptin levels were significantly correlated with body
sively by adipocytes, which regulates appetite and energy
mass index (BMI) and gender, but no significant correlation
expenditure at the hypothalamic level []. In the past few
was found with patient age, duration of disease, radiographic
years, additional actions have been attributed to this mol-
severity of knee OA, VAS score or Lequesne index. There
ecule, specifically, modulating the immune response and
was no correlation between plasma adiponectin level and
affecting the bone and cartilage metabolism [,
BMI, gender and age, duration of the disease, radiographic
Adiponectin is also synthesized by adipose tissue, and
severity of knee OA and VAS score. A significant correla-
one of its main actions is to improve insulin sensitivity
tion of plasma adiponectin levels was found only with the
In skeletal joints, adiponectin may act as a pro-inflamma-
Lequesne index. At the end of the mud-bath therapy cycle,
tory agent and may be involved in matrix degradation
serum leptin levels showed a slight but not significant
In patients with osteoarthritis (OA), leptin and adiponectin
increase, while a significant decrease (P \ 0.05) in serum
are detected in both synovial fluid and in plasma []. The
adiponectin levels was found. However, leptin and adipo-
adipokines exhibit different patterns of distribution in the
nectin concentrations after treatment were not correlated
joint and the circulating compartment: plasma levels ofadiponectin exceed those in the paired synovial fluid,whereas leptin concentrations in synovial fluid are higher
A. Fioravanti (&) Á L. Cantarini Á M. R. Bacarelli
Rheumatology Unit, Department of Clinical Medicine
Spa treatments have been applied for therapeutic pur-
and Immunological Sciences, University of Siena,Viale Bracci, 1, 53100 Siena, Italy
poses in rheumatic diseases since ancient times
The mechanism by which mud-packs and/or balneo-
therapy improves the symptoms of rheumatic diseases is
A. de Lalla Á L. Ceccatelli Á P. Blardi
still not fully understood The effects of thermal baths
Center of Clinical Pharmacology, University of Siena,Siena, Italy
are, in part, related to temperature and balneotherapy
also induces a neuroendocrine reaction that causes an
15 min, for a total of 12 applications carried out over a
increase in serum levels of corticosteroids and catechola-
mines ] and a reduction in circulation levels of tumour
It was recommended to patients that they should con-
necrosis factor a (TNF-a) and interleukin-1b (IL-1 b)
tinue their established non-pharmacological treatments
Since serum levels of leptin and adiponectin are influ-
(physical exercise) and non-steroidal anti-inflammatory
enced by temperature [, ], catecholamines [cor-
drugs (NSAIDs; 150 mg Diclofenac tablets, 20 mg Pirox-
icam tablets, 750 mg Naproxen tablets, 200 mg Aceclofe-
evaluated whether spa therapy modify plasma levels of
nac tablets) and/or analgesics (500 mg acetaminophen
leptin and adiponectin in patients with OA treated with a
tablets), which were to be consumed liberally and noted
cycle of a combination of daily locally applied mud-packs
daily in a diary. Furthermore, we advised patients not to
and bicarbonate–sulphate mineral bath water.
utilize corticosteroids or hyaluronic acid infiltrations.
Leptin and adiponectin plasma levels were assessed at
baseline time and after 2 weeks, upon completion of thespa treatment period.
As a part of a recently published randomized single-blind
Baseline blood samples (6 ml) were drawn from an
controlled clinical trial [on the efficacy of spa therapy
antecubital vein, in the supine position in the morning after
in knee OA, we included thirty patients of both sexes with
an overnight fast, and again after 2 weeks under the same
knee OA fulfilling the ACR criteria [Radiological
conditions. The blood was immediately centrifuged and
staging was carried out using the Kellgren method [
patients with a radiological score of I–III were included in
Plasma leptin levels were determined by enzyme-linked
immunosorbent assay method using ready kits of Quanti-
Exclusion criteria for the study were previously pre-
kineÒ human Leptin Immunoassay (R&D Systems Europe,
sented [In addition, for the purposes of this study, we
excluded patients with history of diabetes mellitus, instable
Sensitivity of undiluted samples was 7.8 pg/ml. Inter-
weight history, those treated with medications known to
and intra-assay coefficients of variation were 5.4 and 3.3%,
affect body weight and heavy smokers.
All selected patients resided in the area near the spa at
Plasma adiponectin levels were detected by enzyme-
Rapolano Terme (Siena, Italy) and continued to live at
linked immunosorbent assay method using ready kits of
home and go about their normal daily routines.
QuantikineÒ human Adiponectin Immunoassay (R&DSystems) Sensitivity of undiluted samples was
0.246 ng/ml. Inter- and intra-assay coefficients of variationwere 6.9 and 4.7, respectively.
The patients were treated daily at the spa centre at Rapo-lano Terme with a combination of mud-packs applied on
both knees for 20 min at an initial temperature of 45°C andwith bicarbonate–sulphate mineral bath water at 38°C for
All the patients were evaluated on a 0–100 mm visualanalogue scale (VAS) with 0 for the absence of pain, as
Table 1 Baseline characteristics in 30 patients with knee OA treated
well as the Lequesne Index of severity of knee OA [
Acetaminophen consumption was calculated by the
number of daily tablet intake. The NSAID consumptionscore was expressed as mg equivalence of diclofenac,
according to a previously validated and published scale [
The clinical assessments were performed before and at
the end of the period of spa therapy.
All the parameters of this study are expressed as mean and
standard deviation (SD). For all tests, a p value less than
F female, M male, BMI body mass index, OA osteoarthritis
0.05 was considered as statistically significant.
The difference in clinical parameters (VAS, Lequesne
Table 2 Assessment and biochemical parameters before and after
Index, NSAID and analgesic consumption) and the plasma
leptin and adiponectin levels before and after spa therapy
was assessed using the Student’s paired t-test.
Correlation analysis was performed using Pearson’s
correlation coefficient or Spearman’s rank correlation
For all analyses, SAS System v. 9.0 statistical software
VAS visual analogue scale for spontaneous pain
* P \ 0.05; ** P \ 0.001 versus basal time
The baseline recorded variables in this series of 30 patients
a NSAIDs non-steroidal anti-inflammatory drugs (daily consumption
with OA treated with spa therapy are shown in Table .
At basal time, plasma leptin levels were significantly
b Acetaminophen (daily consumption as tablets)
correlated with BMI (r = 0.41, P \ 0.001) and gender(r = 0.61, P \ 0.001). However, no significant correlation
adiponectin in patients with OA treated with mud-packs
was found between serum leptin and patient age at the time
and balneotherapy. Our results demonstrated only a slight,
of the study (r = 0.04, P = NS), duration of the disease
but not significant, increase in plasma leptin after 2 weeks
(r = 0.07, P = NS), radiographic severity of knee OA
of spa therapy with no evident correlation with parameters
according to Kellgren and Lawrence’s score (r = 0.18,
P = NS), VAS score (r = 0.20, P = NS) or Lequesne
Leptin induces the expression of growth factors such as
IGF-1 and TGF-b1, stimulates proteoglycan and collagen
There was no correlation between the plasma adipo-
synthesis, and increases the stimulatory effects of pro-
nectin level and BMI (r = -0.30, P = 0.06), gender
inflammatory cytokines on nitric oxide (NO) production in
(r = 0.04, P = 0.82), age (r = 0.20, P = 0.22), duration
chondrocytes []. Leptin may also trigger cartilage
of the disease (r = 0.05, P = NS), radiographic severity of
destruction by increasing matrix metalloproteases (MMP)-9
knee OA (r = 0.21, P = NS) or VAS score (r = 0.19,
and MMP-13 ]. The present study shows for first time
P = NS). However, a significant correlation of plasma
that there is no significant change in leptin concentration
following a cycle of spa therapy. However, leptin concen-
tration, measured after the treatment, did not correlate with
After spa treatment (2 weeks), we observed a statisti-
the clinical parameters (VAS, Lequesne Index).
cally significant reduction (P \ 0.001), in spontaneous
In our study, spa therapy produced a significant decrease
pain and in the Lequesne index score for gonarthrosis
(P \ 0.05) in serum adiponectin levels in patients with
(Table ). This symptomatic effect was confirmed by the
significant reduction in NSAID consumption.
There is some evidence that adiponectin in skeletal
At the end of the cycle of mud-bath therapy, serum
joints may have pro-inflammatory effects and may be
leptin levels showed a slight, but not significant increase,
while we found a significant decrease (P \ 0.05) in serum
Lago et al. recently demonstrated that adiponectin
adiponectin levels (Table ). However, leptin and adipo-
induced the expression of type-2 nitric oxide synthase
nectin concentrations after the treatment were not corre-
(NOS) and stimulated IL-6, MMP-3, MMP-9 and mono-
lated with other clinical parameters (VAS and Lequesne
cyte chemoattractant protein-1 (MCP-1) release In
index score) described in Table (data not shown).
view of these recent findings, the decrease in adiponectin
Finally, it should be noted that no changes whatsoever
after spa therapy demonstrated in our study may play a
were made in terms of diet or physical activity levels, and
no modifications in body weight were observed.
However, adiponectin presents metabolic properties as it
increases insulin sensitivity, improves glucose metabolismand decreases plasma triglycerides, and has antiatheroge-
netic actions []. Furthermore, plasma levels ofadiponectin are low in obese individuals and in those with
This preliminary report was designed to investigate the
cardiovascular disease [, , ]; obesity and cardiomet-
possible effect of spa therapy on plasma levels of leptin and
abolic syndrome are frequently associated with OA [
Thus, it is important to study the effects of spa therapy on
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