anti-asthmatic and cardioprotective efficacy of curcumin-a review
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http://www.ijsrpub.com/uploads/papers/IJSRK/IJSRK-2014/May/IJSRK-14-25.pdfTRANSCRIPT
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International Journal of Scientific Research in Knowledge, 2(5), pp. 215-223, 2014
Available online at http://www.ijsrpub.com/ijsrk
ISSN: 2322-4541; 2014 IJSRPUB
http://dx.doi.org/10.12983/ijsrk-2014-p0215-0223
215
Review Paper
Anti-Asthmatic and Cardioprotective Efficacy of Curcumin-A Review
Muhammad Tahman Shahid1, Syeda Khair-ul-Bariyah
2*
1Center for Research in Molecular Medicine (CRIMM), The University of Lahore, Lahore, Pakistan 2Department of Chemistry, Forman Christian College (A Chartered University), Lahore, Pakistan
*Corresponding authors E-mail: [email protected]
Received 24 February 2014; Accepted 7 April 2014
Abstract. Curcumin is a natural yellow pigment of turmeric. It is used for the treatment of diseases like Alzheimer's disease,
chronic obstructive pulmonary disease, asthma, neuropathic pain, psoriasis, cancer and atherosclerosis. The present review
aims to encompass the studies of curcumin as anti-asthmatic and cardioprotective. It has shown antiallergic properties by
inhibiting histamine release from mast cells. It has been evidenced to have anti-inflammatory properties through inhibition of
the NF-B pathway. By its good radical scavenging activity, it has proved to be potent in treating cardiovascular diseases. However, its combination with other asthma and cardio medicines needs to be evaluated, especially; combination of herbal
medicines or curcumin along with synthetic drugs can lead to positive outcomes. Moreover, derivatives of the drug can also
show some promising results and more derivatives, like CNB001, must be synthesized and investigated to control airway
epithelial cell function and asthma. Only little work has been done so far showing its effects on the pulmonary functions of
smokers, so this area needs to be explored by further clinical trials.
Keywords: Curcumin, antiallergic, asthma, cardioprotective, anti-inflammatory
1. INTRODUCTION
1.1. Asthma
Asthma is a disease of the airways which is chronic in
nature. The inflammation of the airways results in
increased contractability of the smooth muscles which
are surrounding the airways. As a result of this, the
airways are narrowed and finally it results in
wheezing. Lamina reticularis thickens and eosinophils
increase. Moreover, mucous glands increase and the
smooth muscles surrounding the airways also
increase. Other cell types and components of the
immune system involved are T-lymphocytes,
macrophages, neutrophils and chemokines, cytokines
and histamines, respectively (Murray and Nadel,
2010).
The causes of asthma are both environmental and
genetic (Martinez, 2007). Epigenetics as well as the
changes occurring in the environment cause asthma
(Dietert, 2011). Allergens, air pollution, high ozone
levels, traffic pollution, cockroaches, dust mites,
animal dander, mold and smoking during and after
pregnancy are the factors that result in asthma
(Arshad, 2010; Custovic et al., 2012; Gold et al., 2005
and Kelly et al., 2011). Volatile organic compounds
like formaldehyde and phthalates in PVC are also
linked with asthma causes (McGwin et al., 2010,
Jaakkola et al., 2008 and Bomehag et al., 2010). Some
respiratory diseases like rhinovirus and respiratory
syncytial virus can lead to asthma (Murray and Nadel,
2010). Family histories as well as genetic variations
enhanced by environmental exposures are found to be
linked to asthma (Martinez, 2007). Twenty five genes
were found to be the cause of asthma and over 100
genes according to one study in 2006 (Ober et al.,
2006 and Halapi et al., 2009). In patients with history
of atopic disease, asthma occurs at a much greater rate
(Rapini et al., 2007). The patients with any type of
urticaria also face asthma symptoms (Rapini et al.,
2007). In obese individuals, buildup of fat leads to
decreased respiratory function (Wood et al., 2009).
Beta blockers, ASA, NSAIDs and angiotensin-
converting enzyme inhibitors are also responsible to
trigger the disease in susceptible patients (ORourke, 2007; Salpeter et al., 2001; Covar et al., 2005). The
exacerbating agents of asthma are animal dander,
molds, perfumes, infections of the upper respiratory
tract, bacterial and viral infections and psychological
stress (Gold et al., 2005; Baxi et al., 2010 and Chen et
al., 2007).
The medication for asthma is divided into two
classes. First class is quick-relief medication which is
for treating severe cases. Second class is for long-term
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Anti-Asthmatic and Cardioprotective Efficacy of Curcumin -A Review
216
control which controls recurrence of the disease and
its intensity prevention (NHLBI Guideline, 2007).
First class includes beta2-adrenoceptor agonists
(SABA), anticholinergic medications and adrenergic
agonists (Parsons et al., 2013; Rodrigo et al., 2006 and
Schiffman et al., 2009). Second class includes
corticosteroids, long-acting beta-adrenoceptor
agonists, leukotriene antagonists and mast cell
stabilizers (NHLBI Guideline, 2007; Ducharme et al.,
2010; Fanta, 2009; Cates et al., 2012; GINA, 2011,
Watts et al., 2012; Chauhan et al., 2013, British
Guideline, 2009).
1.2. Cardiovascular Diseases
Cardiovascular diseases are the diseases of the heart
and related vessels (Maton et al., 1993). There are
many reasons for cardiovascular diseases but the most
common are atherosclerosis and hypertension. With
increase of age, many physical and morphological
changes occur that cause risk of the disease. The types
of cardiovascular diseases include cardiomyopathy,
hypertensive heart disease, cardiac dysrhythmias,
endocarditis, corpulmonale, myocarditis, peripheral
arterial disease, congenital heart disease,
cerebrovascular disease and rheumatic heart disease.
The factors which increase the risk of heart diseases
are gender, age, high blood pressure, hyperlipidemia,
diabetes mellitus, excessive alcohol and sugar
consumption, smoking, air pollution, psychosocial
factors, lack of physical activity, obesity and family
history (Howard et al., 2002;Finks et al., 2012;Bridget
et al., 2010). Intake of low fat and high fiber content
food, avoiding tobacco smoking, limiting alcohol
consumption, decreasing body fat and daily exercise
can lessen the danger (Ignarro et al., 2007; World
Heart Federation, 2011, The National Heart, Lung and
Blood Institute, 2011;Klatsky, 2009;McTigue et al.,
2006). Mineral and vitamin supplements have not
shown any positive results in decreasing the risk of
the disease but niacin is a type of vitamin B3 which
has shown to reduce the risk factors to some extent.
Taking magnesium as a diet supplement reduces high
blood pressure (Bhupathiraju et al., 2011; Jee et al.,
2002). In those patients who have low risk of heart
disease, aspirin has proved to be beneficial. In people
having history of cardiovascular disease statins are
effective (Berger et al., 2011, Gutierrez et al., 2012).
Some of the medicines used to treat cardiovascular
diseases are Zocor, Verapamil, Xarelto (rivaroxaban),
Tricor (fenofibrate), Tektuma (aliskiren), Soliris
(eculizumab), Rythmol, ReoPro, Posicor, Plavix
(clopidogrel bisulfate), Normiflo, Natrecor
(nesiritide), Micardis (telmisartan), Lescol (fluvaststin
sodium), Kynamro (mipomersen sodium), Inspra
(eplerenone tablets), Fenofibrate, Diovan (valsartan),
Corlopam, Benicar, Azor (amlodipine besylate),
Adcirca (tadalafil), Angiomax (bivalirudin) and many
others (Murray and Nadel, 2010).
Curcumin is mostly known for its anti-cancer
activities but some work has also been done showing
its anti-asthmatic and cardioprotective potential. The
present review aims to cover the research done on
curcumin disclosing its role in asthma and
cardiovascular diseases investigated so far.
2. CURCUMIN
Curcumin is a diarylheptanoid and a natural phenol
giving colour to turmeric (Dorland, 2011). It exists in
tautomeric forms which can be seen in fig. 1 and fig.
2.
Fig. 1:Enol Form
Fig. 2: Keto Form
It is considered to interact with the molecules
involved in inflammation by down-regulating
cyclooxygenase-2, lipoxygenase and nitric oxide
synthase activity (Gupta, 2011; Abe et al., 1999; Goel
et al., 2008). Curcumin has proved to be effective in
pancreatic cancer, colon cancer, psoriasis, arthritis,
Alzheimers disease and multiple myeloma (Hatcher
et al., 2009; Yan et al., 2009; Zhao et al., 2012). In
colon cancer, it serves as vitamin D receptor ligand
(Bartik et al., 2010).
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217
3. CURCUMIN AND RESPIRATORY
DISORDERS
Curcumin has been reported to treat Acute
Respiratory Distress Syndrome in a model of female
rats by alteration of inflammation and myofibroblast
differentiation (Avasarala et al., 2013). Some of the
lung injuries are induced by aspirating gastrointestinal
decontamination agents. Curcumin has also been
evidenced to show preventive effect against these
injuries because of its anti-inflammatory potential
(Gunaydin et al., 2012). Congenital Central
Hypoventilation Syndrome (CCHS) has been reported
to be due to duplications of the PHOX2B gene. It is
suggested that 17-AAG and curcumin are effective in
vitro in rescuing the nuclear localization and
transactivation activity of PHOX2B carrying the
largest expansion of polyAla and promoting the
clearance of aggregates of these mutant proteins (Di
Zanni et al., 2012). In acute lung injury, curcumin was
evidenced to be a good therapeutic agent (Guzel et al.,
2009). Curcumin has been found to be an alternative
therapy for injury of lung transplantation. It is due to
suppression of nuclear factor-kappa B-mediated
expression (Sun et al., 2008). Curcumin can be used
successfully in the hyperactive states of the gut and
airways (Gilani et al., 2005). Curcumin has been
reported to inhibit pro-inflammatory cytokine
production by lung inflammatory cells ex vivo (Literat
et al., 2001). In paraquat lung injury, curcumin has
been found to have protective effect (Venkatesan,
2000).
4. ANTI-ASTHMATIC POTENCY OF
CURCUMIN
Curcumin is not water-soluble. In one study, its dry
emulsion (DE-CUR) was prepared to deliver it orally
and checked its anti-asthmatic efficacy by using
murine asthma model. Levels of T-helper cytokines
(interleukin-4, interleukin-5, interleukin-13)and
airway hyperresponsiveness was evidenced to
suppress showing effectiveness of DE-CUR as a
component of functional foods and asthma medicines
(Jang et al., 2014). Intestinal absorption as well as
anti-asthmatic potential of curcumin was found to
increase by fabricating solid dispersion granules
containing curcumin(SDG-CUR), hence, proving it to
be a potent oral formulation (Jang et al., 2014). The
nasal epithelium serves as a defense during respiratory
infections like those caused by respiratory syncytial
virus (RSV). Curcumin inhibited the replication and
budding of RSV as well as the epithelial responses to
it. Moreover, the upregulation of the epithelial barrier
function was enhanced. It showed inhibition of NF-
kB, eIF-2 dephosphorylation, proteasome and
COX2. Without cytotoxicity, it proved to treat lower
respiratory tract diseases in young children and infants
(Obata et al., 2013).
The evaluation of intranasal curcumin in mouse
blood plasma and lung tissue was carried out by
HPLC. Detection of the drug was done after every 15
min-3h at a dosage of 5 mg/kg. This dosage showed
potency against asthma by bronchoconstriction
inhibition and recruitment of inflammatory cells in the
lungs. By HPLC, retainment of curcumin absorption
was reported for up to 3 h. This study evidenced the
possibility of curcumin to be used in nasal drops.
Curcumin serves to retain breathing after asthma
attack (Glickman et al., 2013). In vitro and in vivo
experiments were performed to explore the effects of
curcumin in asthma on the proliferation of airway
smooth muscle cells (ASMCs). As compared to model
group, reduction of the airway wall thickness, the
number of ASMCs and the expression of extracellular
signal-regulated kinase (ERK) were reported in the
curcumin treated group. Platelet-derived growth factor
(PDGF) which causes cell proliferation is inhibited by
curcumin. Moreover, PDGF-induced phosphorylation
of ERK was also found to decrease in rats. Protein
expression of Caveolin-1 and mRNA was also
upregulated by curcumin (Zeng et al., 2013).
The inhibition of the mRNA expression and
production of thymic stromal lymphopoietin (TSLP)
in the human mast cell line, HMC-1 cells was
investigated. The assays used were caspase-1,
luciferase, immunosorbent and reverse transcription-
polymerase chain reaction. The expression and
production of TSLP was evidenced to decrease with
the maximum inhibition rate to be 59.16+4.20% at
50M of curcumin. The luciferase and caspase-1
activity was found to decrease. Hence, the role of
curcumin in the treatment of atopic and inflammatory
diseases was proved (Moon et al., 2013). In a mouse
model of allergic asthma, the mechanism of curcumin
on ovalbumin (OVA)-induced allergic inflammation
was investigated. Eosinophil count was noted to be
increased and OVA-induced eosinophilia in lung
tissue was inhibited. Inhibition of Th 17 cells and
increase of Treg cells was expressed by flow
cytometry (FCM). The use of curcumin in allergic
asthma became clear with this study (Ma et al., 2013).
The potential of curcumin to modulate CD4+
Tcells-mediated autoimmune disease was
investigated. This treatment resulted in the induction
of unfolded protein response (UPR) signaling
pathway. Furthermore, increase in the expression of
ER stress associated transcriptional factors XBP-1 and
cleavage of p50ATF6 and C/EBP homologous protein in CD4+ and Jurkat T cells was also
reported(Zheng et al., 2013). The link between curry
intake and pulmonary function among smokers and
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Shahid and Khair-ul-Bariyah
Anti-Asthmatic and Cardioprotective Efficacy of Curcumin -A Review
218
non-smokers was studied taking 2,478 Chinese older
adults who aged 55 yrs and above in the Singapore
Longitudinal Studies. Curry intake was found to be
significantly linked with better FEV(1) and large
differences in FEV (1) and FEV (1)/FVC% between
curry and non-curry intake were recorded among
current and past smokers. Mean adjusted FEV (1) for
current smokers was 9.2% higher, for past smokers it
was 10.3% higher and for non-smokers 1.5% higher
(Ng et al., 2012).
Matrix metalloproteinases (MMPs) are found to be
involved in asthma. The expression and secretion of
various MMPs are reported to be regulated by
curcumin (Kumar et al., 2012). Curcumin-solid lipid
nanoparticles (curcumin-SLNs) were studied in an
ovalbumin (OVA)-induced allergic rat model of
asthma. The tissue concentrations were found to
increase followed by suppression of airway
hyperresponsiveness. The expression of T-helper-2-
type cytokines (interleukin-4 and interleukin-13) were
evidenced to be inhibited, thus, proving curcumin-
SLNs to be positive in asthma treatment. The role of
curcumin in allergic conjunctivitis (AC) in an
experimental AC model was investigated. Curcumin
was found to suppress allergic conjunctival
inflammation (Chung et al., 2012).
A curcumin derivative, CNB001, was checked to
control airway epithelial cell function and asthma.
Synthetic double-stranded RNA stimulated normal
human bronchial epithelial (NHBE) cells. IL-6, TNF-
and GM-CSF production by NHBE cells was suppressed by the derivative of curcumin more
effectively than curcumin. It also significantly
inhibited the decrease of E-cadherin and vimentin
mRNA expression was reported to increase. Overall,
the derivative CNB001, treated neurophilic airway
inflammation in asthma (Narumoto et al., 2012).In
another study, curcumin was found to alleviate the
pathological changes of chronic asthma (Karaman et
al., 2012).
The inhibitory effects of thymoquinone (TQ) and
curcumin on the biological changes linked with
asthma were studied. Inflammatory cells aggregation was inhibited more by thymoquinone (TQ) in
bronchoalveolar lavage (BAL) fluid and lung tissues.
More significant decrease of serum IgE was seen by
TQ along with greater inhibitory effects on iNOS and
TGF-1. Inhibition of mRNA expression of TNF- was greater by curcumin (Ammar et al., 2011). Oral
administration of curcumin on lung histopathology,
serum nitric oxide levels and fungal burden in a
murine model of asthma and oropharyngeal
candidiasis (OPC) was reported. Improvement of all
histological parameters was seen in curcumin treated
group and curcumin along with its combination with
dexamethasone decreased nitric oxide levels.
Decrease in fungal burden was also noted. Hence,
treatment of chronic asthma with curcumin was
evidenced to be effective along with decrease in OPC
frequency (Karaman et al., 2011).
The treatment of stable, persistent atopic asthma
with oral curcumin was investigated. Adult patients
were selected for the study and they were given 1000
mg of curcumin twice a day or placebo. For a period
of six months spirometry was performed followed by
asthma control test (ACT) scoring and measurements
for fractional excretion of nitric oxide (NO), serum
eosinophil count, total IgE and leukocyte count. In the
treatment arm, 9 patients were subjected and six were
in the placebo group. The given dosage of curcumin
was not reported to significantly affect
postbronchodilator FEV (1) and ACT scores along
with other parameters studied (Kim et al., 2011).
Curcumin was evidenced to inhibit allergic airway
inflammation and hyperresponsiveness through NF-
kB inhibition with an IC(50) of 21.50+1.25M.
Amelioration of mucus occlusion in lung tissues was
found to be significant (Oh et al., 2011).
The extract of curcumin (60%) inhibited bacterial
infections which result in exacerbation of asthma
(Nilani et al., 2010). Curcumin was found to inhibit
inflammatory genes in inflammatory lung diseases
(Barnes, 2009). Curcumin extract (60%) was reported
to scavenge nitric oxide as an alternate anti-asthmatic
therapy (Nilani et al., 2009). Curcumin has been
evidenced to show anti-inflammatory activity in
murine asthma model and lung epithelial cells A549
by suppressing nitric oxide (NO) and iNOS, thus,
proving itself to be an adjuvant therapy for airway
inflammation (Moon et al., 2008). Curcumin was
found to reverse steroid resistance in asthma patients
(Meja et al., 2008). Curcumin was also reported to
have antiallergic properties as it has inhibitory effects
on histamine from mast cells (Kurup et al., 2008).
The role of curcumin as an immunomodulator was
investigated by using murine model of latex allergy
taking BALB/c mice that were exposed to allergens.
As a result, the mice developed latex allergy with a
Th2 type of immune response. After treatment with
curcumin the allergic responses were controlled
(Kurup et al., 2007). Curcumin was found to enhance
antibody responses at low doses and can also
downregulate the expression of various
proinflammatory cytokines (TNF, IL-1, IL-2, IL-6,
IL-8, IL-12) and chemokines (Jagetia et al., 2007).
Curcumin was reported to be an inhibitor of JNK
kinase (Wuyts et al., 2003). Features of asthma, like,
airway hyperreactivity to histamine and airway
constriction, were induced in guinea pigs by
sensitizing them with ovalbumin (OVA). The pigs
were treated with curcumin (20 mg/kg body weight)
both before and after sensitization. Specific airway
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International Journal of Scientific Research in Knowledge, 2(5), pp. 215-223, 2014
219
conductance (SGaw) determined airway constriction
and hyperreactivity. Both airway constriction and
hypereactivity were seen to be inhibited significantly,
thus, proving curcumins effectiveness in OVA-sensitized guinea pigs. Curcumin also inhibited
Dermatophagoides farinea (Df)-induced lymphocyte
proliferation and production of IL-2. Hence, by
inhibition of cytokines production, curcumin controls allergic diseases.
5. CARDIOPROTECTIVE POTENCY OF
CURCUMIN
Curcumin has been reported to induce autophagy in
human umbilical vein endothelial cells (HUVECs)
which serves as a therapeutic avenue for the treatment
of oxidative stress-related cardiovascular diseases
(Han et al., 2012). Curcumin was evidenced to induce
cardioprotective effect against catecholamine-induced
cardiotoxicity via preservation of mitochondrial
function. Male Wistar rats received subcutaneous
injection of isoprenaline for a period of 2 days
consecutively with or without pretreatment with
curcumin 60 mgkg(-1)day(-1). Isoprenaline induced
apoptosis and cell death which was found to be
protected by curcumin. Moreover, mitochondrial
swelling and respiration were prevented by curcumin
and it prevented the ISO-induced increase in mPTP
calcium susceptibility in isolated cardiomyocytes
(Izem-Mezianne et al., 2012). The turmeric extract has
been found to have therapeutic activities that block the
cardiac, renal and hepatic toxicities induced by
doxorubicin. This is due to its free radical scavenging
activity (Mohamad et al., 2009). Curcumin was
reported to decrease serum cholesterol level and hence
it protects against the pathological changes occurring
with atherosclerosis. Curcumin has p300-HAT
inhibitory effects and because of this it prevents the
development of cardiac hypertrophy and heart failure.
It also prevents atrial arrhythmias and ventricular
arrhythmias (Wongcharoen et al., 2009). Oral
pretreatment with curcumin (200 mg/kg) on
isoproterenol-induced mycardial injury in rats was
found to increase antioxidant activity of curcumin,
hence, showing cardioprotective property (Nazam et
al., 2007).Curcumin enhances the activities of
detoxifying enzymes like glutathione-S-transferase
and inhibits free-radical generation in myocardial
ischemia in rats (Miriyala et al., 2007).
6. CONCLUSION
Curcumin is a natural polyphenolic antioxidant
compound that exerts anti-inflammatory and
immunomodulatory effects influencing the activation
of T cells (immune cells).It can also inhibit pro-
inflammatory cytokines and chemokines expression
by suppressing NF-B signaling pathway. It is due to its immunomodulatory potential that proves its
usefulness in diseases like arthritis, allergy, asthma,
atherosclerosis, diabetes and cancer. The article
covers the anti-asthmatic and cardioprotective
potential of curcumin, yet, its protective role in
pulmonary function of smokers needs to be
investigated further. Moreover, its synergic effect with
other asthma and cardioprotective medicines needs to
be checked. New analogs of curcumin to selectively
inhibit different MMPs can also be designed. So far,
curcumin has shown promising results in asthma and
cardiac treatment and further combinatorial studies
with synthetic and herbal medicines can open new
horizons for research and treatment.
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International Journal of Scientific Research in Knowledge, 2(5), pp. 215-223, 2014
223
Muhammad TahmanShahid did his BS (Hons) (Biochemistry) from IMBB (Institute of
Molecular Biology and Biotechnology), The University of Lahore, Lahore, Pakistan in the year
2010. He did his M.Phil (Biochemistry) from CRIMM (Center for Research in Molecular
Medicine), The University of Lahore, Lahore, Pakistan in the year 2014. His areas of research
and interest are chemotherapy, molecular biology, enzymology and pathology. He has
publications in both national and international journals covering areas of nuclear extract
preparation from stem cells, analgesia and cancer medicines. He has expertise in the areas of cell
culturing (stem cells), MTT Assay, PCR, ELISA, PAGE, Western Blotting and all blood tests.
He is working in partnership as a biochemist in Invitro Diagnostic Centre, Lahore since 2008
and is running his own pathology lab in Gujranwala, Pakistan by the name of Al Asmar
Diagnostic Lab.
SyedaKhair-ul-Bariyah did her M.Sc. (Organic Chemistry) from Government College
University, Lahore, Pakistan in the year 2007 and completed her M.Phil (Organic/Biochemistry)
from Forman Christian College (A Chartered University), Lahore, Pakistan in the year 2011. She
has publications in both national and international journals covering areas of effect of essential
oils on diabetes and their anti-urease activity, nuclear extract preparation, mineral content,
nutritional value and analysis of physical characteristics of essential oils, analgesia and cancer
medicines and reviews on medicinal plants. Her main areas of research and interest are
medicinal plants, drug discovery and modification. She also has expertise in the areas of stain
removal synthesis and synthesis of perfumes. She is also a graduate in science education and
currently a masters student of science education with main focus on effective teaching
methodologies.