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Anti-cytotoxicity
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Manju and Sreenivasan103 demonstrated the fabrication of water soluble CUR conjugated gold NPs to try various cancer cell lines. CUR conjugated to hyaluronic prickly (HA) to profit a water soluble conjugate (HA-CUR) Gold nanoparticles (AuNPs) were prepared by reducing chloroauric acid using HA-CUR, which played the dual role of a reducing and stabilizing agent and later anchored folate conjugated PEG. Their relationships following cancer cell lines, such as HeLa cells, glyoma cells and Caco2 was followed by flow cytometry and confocal microscopy and the results showed significant cellular uptake and internalization of the particles by cells. HA-CUR@AuNPs exhibited more cytotoxicity comparing to doable CUR back enhanced targeting and better efficacy. Starch based microspheres modified by grafting vinyl groups from glycidyl methacrylate (GMA) were prepared by emulsion method to be applied as a device for controlled reprieve of CUR. The microspheres showed to be a enormously promising devise for the controlled straightforward of CUR, especially for the treatment of colon cancer, which in general decreases the pH of the colon. At simulated gastric formless the fraction released of CUR was 100% and in a controlled freshen, due to the sustained diffusion of CUR to the media and moreover due to the degradation of the polymer matrix. The CUR-loaded microspheres presented much highly developed fight adjoining Caco-2 and HCT-116 tumor cell lines than forgive CUR.104 Hasan et al105 reported an pretension in of encapsulation a CUR by nanoliposome to agree an bigger bioavailability of a ill absorbed hydrophobic mix and with demonstrated that liposomal preparations to concentrate on CUR tallying its bioavailability. Liposomes composed of salmon’s lecithin improved curcumin bioavailability compared to the amalgamated type of fatty acids in swap proportions of rapeseed and soya lecithins. A definite-period label-easy to lead to cell analysis system based more or less definite-epoch cell impedance monitoring was used to study the in vitro cytotoxicity of liposomal preparations. Liposomal encapsulation of CUR can mass cellular effect of the drug. Polyelectrolyte undistinguished nanoparticles (PENPs) based on hyaluronic choking/chitosan (HA/CS) as carrier were successfullyprepared for water-insoluble curcuminoids and explored in vitro doing closely brain glioma cells. Encapsulation of CUR into the PENPs was achieved gone high encapsulation efficiency and drug loading talent. CUR-PENPs showed stronger dose dependent cytotoxicity also to C6 glioma cells and to the lead-thinking take effect in uptake efficiency in C6 cells. Cellular uptake of CUR-PENPs was found to be governed by multi-mechanism in C6 cells, involving swift endocytosis, macropinocytosis, clathrin, caveolae and CD44- mediated endocytosis. CUR-PENPs could be a promising carrier for therapy of brain gliomas.
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Biological activities of various curcuminoid formulations
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Drug delivery systems
Polymeric-CUR implants were developed to overcome the poor biopharmaceutical air. These implants are a attainable vary of delivery of CUR to circumvent its bioavailability excruciating behind the avowed oral route and to harness its resolved therapeutic potential.
These implements were found to declare yes well ahead CURconcentrations in plasma, brain and to some extent in liver on zenith of a epoch of 3 months as compared to dietary administration. CUR delivered directly into the systemic circulation was found to be more efficacious in inducing the expression of CYP1A1 and the objection of CYP3A4 enzymes required for its chemopreventive moving picture closely various environmental carcinogens. The presence of significantly detached concentrations of CUR in tissues such as brain showed the potential of this system for patients difficulty subsequent to Alzheimer’s illness and brain gliomas, where CUR has shown significant potential in various in situ and cell culture studies.100 blactoglobulin and nanoemulsion were used as carriers to take in hand CUR. The digestion and permeability of curcumin of b-lactoglobulin and the nanoemulsion were studied using in vitro gastrointestinal model and Caco-2 cell monolayer model respectively. The water solubility and the pH stability of CUR significantly were increased by binding as soon as b-lactoglobulin. The b-lactoglobulin puzzling and nanoemulsion were resistant to pepsin but sore to trypsin. This property is beneficial for CUR for swine delivered into the intestinal tract without its reprieve in the front. The permeation rate of blactoglobulin-CUR puzzling was anew that of digested blactoglobulin-CUR far away away along, both the digestion-absorption and talk to diffusion route may exist at the related time in the intestinal tract because the b-lactoglobulin was enormously sore spot to trypsin.101 Chopra et al102 have synthesized biodegradable and non-toxic polymer such as poly (lacticco-glycolic) acid (PLGA) encapsulated formulation of CUR (PLGA-CUR-NPs) subsequent to than photosafe flora and fauna. The cell cycle analysis, CPDs formation, ethidium bromide/acridine orangey ratio analysis and comet examination are avowed a significant DNA broken in the cells due to pardon CUR but not in PLGA-CUR-NPs. The low level sustained pardon of CUR from PLGA-CUR-NPs could be a promising habit to protect the adverse biological interactions of photodegradation products of CUR coarsely the subject of the expression of UVA and UVB. The applicability of PLGA-CUR-NPs could be suggested as a prolonged compound scavenging ingredient in CUR containing products and could be used as a career of other to transport the CUR to sickness intention sites.
Antimicrobial activity
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Curcumin based metallointercalators subsequent to amino acid such as cysteine has been synthesized by Chandrasekar et al.99 The ligand is coordinated via ketimine, carbonyl and enolic oxygen of CUR analog and the complexes have the composition of metal-ligand type. The prepared complexes are hermetic intercalators and the potential nucleases as compared to CUR based forgive ligand and the complexes are moreover exhibited greater than before to-do neighboring to bacteria and fungi than the ligand.
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Anti-rheumatoid arthritis
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A vanadyl curcumin puzzling was prepared by Thompson et al98 for touching-rheumatoid arthritis. Vanadyl curcumin was more functional in inhibition of serene muscle cell augmentation, synoviocyte proliferation and mouse lymphoma cell mount taking place than CUR alone. It was an efficient inhibitor of synoviocyte proliferation and suggested striking potential as a particular non-toxic treatment for rheumatoid arthritis. The vanadyl curcumin puzzling was ineffective as an insulin mimetic agent proved by an acute and chronic screening test moreover, it moreover proved to be exceptionally non-toxic, subsequent to no evidence of negative symptomatology during a month-long treatment era.
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Anticancer activity
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Photoactive metal complexes have emerged as potential candidates in the photodynamic therapy (PDT) of cancer. Sarkar et al97 reported the synthesis, characterization and visible dexterously-ventilated-triggered anticancer fight of two novel impure-ligand oxo-bridged iron (III) complexes, viz., [{Fe(L)(acac)}2(m-O)](ClO4)2 (1) and [{Fe(L)(- CUR)}2(m-O)](ClO4)2 (2), where L is bis-(2-pyridylmethyl)-bezylamine. The rule rarefied 1 is inactive both in the open and dark. Complex 2 had a sound absorption band in the visible region and showed promising photocytotoxicity in HeLa and MCF-7 cancer cells in visible admission. It before now accumulated in the cytoplasm and induced apoptosis, which was triggered by the photoinduced formation of ROS.
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Antioxidant activity
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Two stoichiometrically swap copper (II) complexes of curcumin (1:1 and 1:2 for copper:curcumin) were investigated for their superoxide dismutase bustle, available futuristic scavenging completion and antioxidant potential. Depending concerning speaking the structure, these two complexes possess every second superoxide dismutase activities, set pointless take in hand looking scavenging abilities and antioxidant potentials. EPR spectra of the complexes showed that the 1:2 Cu (II)-CUR puzzling is square planar and the 1:1 Cu (II)-CUR perplexing is untouched orthorhombic. The 1:1 perplexing would be lithe to undergo and retain the distortion from square planar geometry to the tainted tetrahedral one during its appreciation once superoxide ahead of its period. This allows for the quantity to remain intact and undergo many redox cycles and can be deed as efficient antioxidant. On the adjunct hand the 1:2 puzzling is planar but rigid and cannot undergo the distortion and as a result is a less powerful antioxidant. Thus the 1:1 Cu (II)-CUR obscurehaving distortion from square planar geometry is exhibited a greater than before superoxide dismutase row and with a in agreement forgive fresh-minded scavenger.95 CUR complexes subsequent to Ga (III), In (III) and [VO]2 have been synthesized by Mohammadi et al.96 A ligand bis [4-acetyl-3- hydroxyphenyl]-1,6-heptadiene-3,5-dione (DABC) moreover prepared and characterized. Acetylation of CUR and BDC significantly decreased the antioxidant potential of compounds containing these ligands, but did not outfit cytotoxicity in mouse lymphoma cells. The DABC displayed self-disciplined cytotoxicity and readily formed a vanadyl bisligand highly developed, which moreover showed modest anticancer potential.
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Neuroprotective activity
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Three manganese complexes of CUR and related compounds, diacetylcurcumin (AcylCUR) and ethylenediamine derivatives (CURED) were synthesized and evaluated by in vitro for not well-disposed of-lipid peroxidatioin and superoxide dismutase exchange. The complexes potentiated neuroprotective effects adjoining learning and memory impairment in transient cerebral ischemic mice and as regards H2O2- induced cell irregular in NG108-15 cells. The prepared manganese complexes of CURCURx and AcylCURCURx showed bigger neuroprotective effects in both 2VO-water maze task and cell culture models. The protective effect of Acyl-CURCURx was simply demonstrated by MPTP-induced dopaminergic neurotoxicity in mice and as well as suggested a role for super oxide dismutase mimics in the sponsorship of neutrodegeneration mediated by chemicals and drugs. AcylCURCURx and CURCURx can be the most promising neuroprotective agent for vascular dementia.93 Ferrari et al94 investigated the metal complexing operate a share of substituted curcuminoids of auxiliary chelating molecules using gallium (III) and copper (II), following biological properties comparable considering curcumin back bigger stability as new potential Alzheimer’s disease therapeutic agents. The K2T derivatives originate from the insertion of a eCH2COOC(CH3)3 intervention around the central atom of the diketonic moiety of curcumin. In aqueous conclusive the prevalent form is the diketo one, but the adding together of metal ion (Ga3 and Cu2) causes the dissociation of the enolic proton creating chelate complexes and varying the tautomeric equilibrium towards the keto-enol form. The bond dissociation moving picture (BDE) values of the ligands suggested that skirmish delocalization plays an important role in determining the scavenging triumph. Ga (III) can be utterly promising as superoxidescavengers to use in super oxide dismutase mimics.
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Metal complexes of curcuminoids and their biological activities
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Metal complexes of curcuminoids and their derivatives exhibited approving biological animatronics compared to the parent ligands (Table 2). Metal ions can be complexed with than the b-diketo moiety of curcuminoids. The formed metal complexes often possess a high stability and be muddled along in the middle of.
1. Anti-cytotoxicity
A class of ferrocenyl oxovanadium (IV) complexes of curcuminoids viz. [VO(Fc-tpy)(CUR)](ClO4) (1), [VO(Fc-tpy)(BDHC)](ClO4) (2), [VO(Fctpy)(BDMC)](ClO4) (3) and [VO(Ph-tpy)(CUR)](ClO4) (4), of 40-ferrocenyl-2,20:60,200-terpyridine(Fc-tpy) and 40-phenyl2,20:60,200-terpyridiine (Ph-tpy) and monoanionic curcumin (CUR), bisdehydrocycurcumin (bDHC) and bis-demethoxy curcumin (BDMC) were meant, prepared and characterized and their photo-induced DNA cleavage ruckus and phototoxicity studied by visible light. The complexes showed remarkable PDT bustle inHeLa cells compared to the enough 3T3 cells. The presence of both methoxy and hydroxyl groups are indispensable in the curcuminoid moiety to achieve the desired cytotoxic effect which is avowed by the MTT examination. ICP-MS and fluorescence microscopic studies exhibited significant cellular uptake of the complexes within 4 h of treatment along with complexes. These complexes can be the complete important to fabricate the medicinal chemistry of bioorganometallic complexes as metal based photocytotoxic agents.90 Two rutheniumarene complexes containing curcuminoid ligands (h6-p-cymene) Ru(CUR)Cl-CUR -thiophene aromatic curcuminoids have been synthesized by Lei et al.91 The complexes were evaluated for their in vitro antiproliferative deeds adjoining Hela human cervical epithelioid cancer, as ably as BEL-7404 and SMMC-7721 human liver cancer cell lines. These complexes showed moderately animate cytotoxicity behind-door to three carcinoma cell lines and displayed demean IC50 values than 1. Agarose gel electrophoresis results indicated that the DNA binding ruckus by pBR322 plasmid DNA of the two complexes correlated quite later than their cytotoxicity.91 Copper (II) complexes [Cu(Fc-aa)(CUR)] (1e3) of CUR and N-ferroceynlmethylL-amino acids (Fc-aa), viz ferrocenylmethyl-L-tyrosine (Fc-TyrH), ferrocenylmethyl-L-tryptophan (Fc-TrpH) and ferrocenylmethyl-Lmethionine (Fc-MetH) were prepared to examine the DNA photocleavage vigor, photocytotoxicity and cellular localization in HeLa ad MCF-7 cancer cells. Acetylacetonate (acac) complexes [Cu(Fc-aa)(acac)] (4e6) were prepared and used as controls. Thedesign of the complexes is based concerning to stabilize the hydrolytically unstable CUR, which possesses copious photochemistry, regarding binding to a Cu (II) center, which in incline is bound to the ferrocene-appended amino acids for augmented redox commotion and lipophilicity. The Cu (II) complexes 1e3 showed visible fresh-induced plasmid DNA cleavage be sick and they are nontoxic in dark to the cancer cells showed a significant photoenhanced cytotoxicity when visible open. The photodynamic therapy (PDT) effect was compared adeptly taking into consideration reported for the FDA attributed porphyrin drug Photofrin. Design and compilation of biocompatible CUR and ferrocene-appended condensed Schiff bases of amino acids to a Cu (II) center have resulted in a accessory class of compounds have shown remarkable in vitro photocytotoxic ruckus in the region of the subject of cancer cells in visible open, as a consequences presenting a to your liking potential for releasing their clinical applications in PDT.
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Arsenic and chromium toxicity
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Arsenic is a human carcinogen and a potent hepatotoxin. Environmental exposure to atmosphere to mood to arsenic imposes a huge health hazard to human and calculation animals worldwide. Muthumani et al88 reported tetrahydrocurcumin (THC) pretreatment markedly ameliorated the arsenic-induced dyslipidemia, mitochondrial toxicity and ultrastructural alterations in rat liver. It is avowed by the hepaticmitoprotective nature of THC. The feasible mechanism was suggested that the THC could be due to quenching of forgive radicals by THC, lowering of lipid peroxidases, lipids and improving the antioxidant-enzyme behavior and Ca2, thereby improving the hepatic mitochondrial produce a result in arsenic intoxicated rats. THC exhibited a significant protective effects in the works for mitochondria, which is a crucial element operating in both triggering and mediating the hepatoprotective recognition in hepatic cells. THC can be an functioning antioxidant phytochemical entity taking into consideration to arsenic-induced mitochondrial blinking and oxidative put defeat on.
Molina-Jijon et al89 reported the role of mitochondria in the protective effects of CUR, adopt and indirect antioxidant, the length of the renal oxidant blinking induced by the hexavalent chromium [Cr (VI)] mixture potassium dichromate (K2Cr2O7) in rats. CUR treatment attenuated K2Cr2O7-induced renal dysfunction, histological broken, oxidant appeal attention to, and the decline in antioxidantenzyme animatronics both in kidney tissue and in mitochondria. The prevention of mitochondrial organization played a key role in the protective effects of CUR pretreatment adjoining K2Cr2O7-induced renal oxidant flashing.
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Mutagenicity and hepatoprotective activity
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Vieira et al86 studied and compared the mutagenicity and blood compatibility of curcumin using drug eluting stent components such as paclitaxel and sirolimus by Ames test for assessing mutagenicity and measuring platelet activation and fibrinogen adsorption just about speaking poly (DL-lactide-co-glycolide, PLGA) film to scrutinize blood compatibility. A significant induction in the frequency of bacterial his revertant colonies by paclitaxel at interchange concentrations was observed and moreover a significant narrowing in platelet activation by in the region of PLGA films containing 30% and 50% by weight CUR. Intrinsic hydrophobic properties of CUR could favor fibrinogen adsorption upon PLGA films.
Naik et al87 have used the liver slice culture model to shake uphill hepatoprotective ruckus of CUR in vitro; ethanol used as a hepatotoxin and the cytotoxicity of ethanol is estimated by quantitating the freedom of lactate dehydrgenase. The forgive of lactate dehydrgenase was significantly edited along subsequent to lipid peroxidation and the upheaval of antioxidant enzymes was kept low indicated that CUR by its antioxidant vivaciousness of antioxidant enzymes was kept low indicated that CUR by its antioxidant badly be in pain shortened the oxidative exacerbate induced by ethanol and protected the liver cells in vitro.
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