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Nair AC, Benny S, Aneesh TP, Sudheesh MS, Lakshmi PK. Comprehensive profiling of traditional herbomineral formulation Manasamitra vatakam in rat brain following oral administration and in-silico screening of the identified compound for anti-Alzheimer's activity. JOURNAL OF ETHNOPHARMACOLOGY 2025; 338:119024. [PMID: 39489356 DOI: 10.1016/j.jep.2024.119024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 10/25/2024] [Accepted: 10/31/2024] [Indexed: 11/05/2024]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Multi-targeted drug therapy has received substantial attention for the treatment of diseases of multifactorial origin, such as neurodegenerative diseases. Manasamitra vatakam (MMV) is a traditional Ayurvedic formulation used to improve cognitive impairment and mental illness. Here we have used a unique method for leveraging the barrier properties of the intestinal and blood-brain barrier (BBB) to screen and identify the bioactive molecules against Alzheimer's disease (AD). The current method exemplifies a facile method to expedite drug discovery from traditional formulations. AIM OF THE STUDY The present study aimed to identify the phytoconstituents of MMV that reach the brain tissue and to predict major bioactive constituents by computational docking studies. MATERIALS AND METHODS After oral administration of the formulation, brain samples from male Sprague Dawley rats were collected at different time intervals and analyzed by liquid chromatography-mass spectrometry (LC-MS) to identify the phytoconstituents. In silico molecular docking studies were carried out to analyze the binding affinity of the compounds to the target proteins of AD using Schrodinger Maestro. The molecular dynamic studies were carried out for all the docked complexes having higher docking scores. RESULTS 34 phytoconstituents were identified by LC-MS analysis of brain homogenates. In the in silico docking study, the phytoconstituents chrysin, convolvin, rutin, galangin, palmatoside G, isoliquiritigenin, quercetin, and naringenin showed higher docking score against the target proteins of AD. These compounds may serve as the primary bioactive compounds responsible for the neuroprotective activity of the herbal formulation. Furthermore, molecular dynamic studies indicated that the galangin-acetylcholinesterase enzyme complex has the highest stability among these eight compounds. CONCLUSION The study, together with previous in vivo and in vitro efficacy results, suggests that BBB-permeable compounds with high binding affinities for the target proteins of AD might be responsible for the effectiveness of MMV against AD.
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Nair AC, Kuriakose BB, Biju A, Surendran S, Sudheesh MS, Lakshmi PK. Pharmacological effects of herbal ingredients of Manasamitra vatakam in the treatment of Alzheimer's disease: A review. J Ayurveda Integr Med 2025; 16:101041. [PMID: 39799838 PMCID: PMC11773069 DOI: 10.1016/j.jaim.2024.101041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 06/22/2024] [Accepted: 07/04/2024] [Indexed: 01/15/2025] Open
Abstract
Multi-targeted drug therapy has received substantial attention for the treatment of diseases of multi-factorial origin, including neurodegenerative and autoimmune diseases. It seems reasonable to argue that the complex pathology of neurodegenerative diseases (ND) cannot be reduced to a single target to modulate a broad range of cellular signaling, associated pathologies, and symptoms. It is this idea that has brought the attention of the scientific world towards phytochemicals and traditional drugs that are notoriously multi-targeted. A systematic study of these formulations and establishing the molecular pathways of individual molecules can lead to a standardized multi-component product that can modulate a broad range of activities on different targets of ND. This could provide an accessible and affordable solution to the significant disease burden of ND. With this idea in mind, a systematic review was carried out on an Ayurvedic product Manasamitra Vatakam (MMV), known to be a neuroprotective formulation and highly effective against Alzheimer's disease. MMV can be a source of phytomolecules for treating neurodegenerative diseases. The multifactorial nature of these diseases makes them suitable candidates for testing phytochemicals due to the inherent multitargeting capabilities of these compounds. The primary objective of this review is to provide a comprehensive understanding of the phytomolecules from MMV that are responsible for its multitargeted effect against neurodegenerative diseases. From the reported literature, it is clear that many phytoconstituents and extracts of the herbal ingredients from MMV have demonstrated their efficacy against AD models. However, the combination of these molecules in AD models has never been tested. Scientific studies should be done to explore the bioactive compounds in the formulation and the druggability of these identified compounds can be evaluated using experimental methods.
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Kulkarni AV, Zuberi AA, Chaitanya K, Doolam H, Reddy S, Lakshmi PK, Godbole S, Shantan V, Iyengar S, Alla M, Sharma M, Reddy DN, Rao PN. Human albumin infusion is safe and effective even in patients without acute kidney injury and spontaneous bacterial peritonitis. Indian J Gastroenterol 2024; 43:485-493. [PMID: 38085502 DOI: 10.1007/s12664-023-01475-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Accepted: 10/21/2023] [Indexed: 05/28/2024]
Abstract
BACKGROUND AND OBJECTIVES Human albumin (HA) solution is currently recommended only for patients with spontaneous bacterial peritonitis (SBP) and acute kidney injury (AKI). However, its use in hospitalized patients is quite frequent. The objective was to compare the outcomes of patients receiving HA in recommended (Gr. A) vs. non-recommended (Gr. B) indications. METHODS In this prospective study, consecutive hospitalized patients who received HA were included. Apart from comparing the proportion of patients achieving resolution of hyponatremia, infection and hepatic encephalopathy among Gr. A and Gr. B, we also compared the in-hospital survival and performed a sub-group analysis of patients with the European Association for the Study of the Liver (EASL) acute-on-chronic liver failure (ACLF) and decompensated cirrhosis (DC). RESULTS Of the 396 hospitalized patients who received HA, 180 had AKI and/or SBP (Gr. A), and 216 received albumin for non-recommended indications (Gr. B). The mean age, sex and etiology distribution were similar. The total dose of HA was higher (88 ± 61.62 g vs. 71.31 ± 488.17 g; p = 0.003) and the duration longer (4 ± 2.37 vs. 3.4 ± 1.82 days; p = 0.005) in Gr. A than B. The resolution of infection and HE was similar among both groups, while hyponatremia resolution was significantly higher in Gr. B (94.7%) than Gr. A (75.6%; p < 0.001). On Kaplan-Meier analysis, survival was significantly higher in Gr. B (94%) than Gr. A (78.9%; p < 0.001). The incidence of albumin-induced fluid overload was comparable (2.8% vs. 1.4%; p = 0.32). Patients with ACLF were sicker with a higher incidence of microbiologically proven infection, hepatic encephalopathy (HE) and hyponatremia than in the DC group. Resolution of infection and hyponatremia and in-hospital survival was significantly lower in the ACLF group (72.5%) than in the DC group (92.7%; p < 0.001). Eighty-six per cent of patients achieved resolution of ACLF. CONCLUSIONS HA infusion is safe and effective even in patients without AKI and SBP and leads to the resolution of infection, hyponatremia, HE and ACLF.
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Nair B, Adithya JK, Chandrababu G, Lakshmi PK, Koshy JJ, Manoj SV, Ambiliraj DB, Vinod BS, Sethi G, Nath LR. Modulation of carcinogenesis with selected GRAS nutraceuticals via Keap1-Nrf2 signaling pathway. Phytother Res 2023; 37:4398-4413. [PMID: 37468211 DOI: 10.1002/ptr.7940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 05/16/2023] [Accepted: 06/25/2023] [Indexed: 07/21/2023]
Abstract
Keap1-Nrf2 is a fundamental signaling cascade known to promote or prevent carcinogenesis. Extensive studies identify the key target of modulatory aspects of Keap1-Nrf2 signaling against cancer. Nutraceuticals are those dietary agents with many health benefits that have immense potential for cancer chemoprevention. The nutritional supplements known as nutraceuticals are found to be one of the most promising chemoprevention agents. Upon investigating the dual nature of Nrf2, it became clear that, in addition to shielding normal cells from numerous stresses, Nrf2 may also promote the growth of tumors. In the present review, we performed a systematic analysis of the role of 12 different nutraceuticals like curcumin, sulforaphane, resveratrol, polyunsaturated fatty acids (PUFA) from fish oil, lycopene, soybean, kaempferol, allicin, thymoquinone, quercetin, gingerol, and piperine in modulating the Nrf2/Keap1 signaling mechanism. Among these, 12 Generally Recognized As Safe (GRAS) certified nutraceuticals, sulforaphane is the most extensively studied compound in modulating Keap1-Nrf signaling. Even though there is much evidence at preclinical levels, further high-quality research is still required to validate the potential role of these nutraceuticals in Keap1-Nrf2 modulation.
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Darshini MD, Sreelakshmi MS, Adithya J, Aryaputhri NS, Lakshmi PK, Nath LR. A systematic analysis of the ethnopharmacological relevance of an Indian traditional plant, Hemidesmus indicus (L.) R.Br. for the past 10 years. JOURNAL OF APPLIED PHARMACEUTICAL SCIENCE 2023. [DOI: 10.7324/japs.2024.159652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2025]
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Lakshmi PK, Kumar S, Pawar S, Kuriakose BB, Sudheesh MS, Pawar RS. Targeting metabolic syndrome with phytochemicals: Focus on the role of molecular chaperones and hormesis in drug discovery. Pharmacol Res 2020; 159:104925. [PMID: 32492491 DOI: 10.1016/j.phrs.2020.104925] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 05/10/2020] [Accepted: 05/10/2020] [Indexed: 12/21/2022]
Abstract
Adaptive cellular stress response confers stress tolerance against inflammatory and metabolic disorders. In response to metabolic stress, the key mediator of cellular adaptation and tolerance is a class of molecules called the molecular chaperones (MCs). MCs are highly conserved molecules that play critical role in maintaining protein stability and functionality. Hormesis in this context is a unique adaptation mechanism where a low dose of a stressor (which is toxic at high dose) confers a stress-resistant adaptive cellular phenotype. Hormesis can be observed at different level of biological organization at various measurable endpoints. The MCs are believed to play a key role in adaptation during hormesis. Several phytochemicals are known for their hormetic response and are called phytochemical hormetins. The role of phytochemical-mediated hormesis on the adaptive cellular processes is proposed as a potential therapeutic approach to target inflammation associated with metabolic syndrome. However, the screening of phytochemical hormetins would require a paradigm shift in the methods currently used in drug discovery.
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Pawar R, Lakshmi PK, Kumar S, Dobriyal N, Sahi C. Ameliorative effect of Tinospora tuberculata in insulin resistance: Potential roles of oxidative stress resistance and heat shock protein 70 (Hsp 70) modulation. Pharmacogn Mag 2020. [DOI: 10.4103/pm.pm_366_20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Lakshmi PK, Harini K. Design and Optimization of Thermo-reversible Nasal in situ Gel of Atomoxetine Hydrochloride Using Taguchi Orthogonal Array Design. ACTA ACUST UNITED AC 2019. [DOI: 10.3329/dujps.v18i2.43261] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The present investigation was aimed to develop a thermo-reversible nasal in situ gel of atomoxetine hydrochloride (AH) with reduced nasal muco-ciliary clearance in order to improve residence time and targeting the brain through nasal mucosa for the treatment of attention-deficit hyperactivity disorder (ADHD). In situ gel formulations were prepared using different concentrations of the thermo-gelling poloxamer 407 and mucoadhesive polymers. Temperature-triggered ionic gelation is the mechanism involved. Taguchi L9 OA experimental design was employed for the optimization of the effect of independent variables (Poloxamer 407 and Carbopol 934P) on the response (gelation temperature). In situ gel formulation F4 having 20% poloxamer 407 and 0.3% carbopol 934P and formulation F6 having 20% poloxamer 407 and 0.2% HPMC K100 were optimized based on evaluation parameters. The gelation temperature of F4 and F6 was found to be 37°C ± 0.4 and 37°C ± 0.2, drug content 98.34 and 98.33% and drug release was 83.18, 82.4% in 4 hrs with a flux of 436.9 and 428.1 μg.cm2/hr, respectively. The release pattern of drug followed first-order kinetics with Higuchi release mechanism. The value of ‘n’ from Korsemeyer equation indicated the anomalous diffusional drug release. This study concluded that in situ gel enhanced the nasal residence time and thus may improve the bioavailability of the drug through nasal route by avoiding first pass metabolism
Dhaka Univ. J. Pharm. Sci. 18(2): 183-193, 2019 (December)
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Kumar S, Lakshmi PK, Sahi C, Pawar RS. Sida cordifolia accelerates wound healing process delayed by dexamethasone in rats: Effect on ROS and probable mechanism of action. JOURNAL OF ETHNOPHARMACOLOGY 2019; 235:279-292. [PMID: 30769040 DOI: 10.1016/j.jep.2018.07.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2017] [Revised: 05/23/2018] [Accepted: 07/03/2018] [Indexed: 06/09/2023]
Abstract
ETHNO PHARMACOLOGICAL RELEVANCE Sida cordifolia is used commonly in traditional systems of medicine (TSM) and as folk remedies for treating the wounds (both external and internal), infected area, rheumatic disorders, muscular weakness, tuberculosis, heart problems, bronchitis, neurological problems etc. Therefore, in order to authenticate the claims, a mechanism-oriented investigation of the wound healing properties of this plant is essential. AIM OF THE STUDY The overall aim of the present research is to understand the precise unknown cellular and molecular mechanism by which S. cordifolia accelerates wound healing delay caused by the steroidal drug dexamethasone. Here, we have also tried to quantify intracellular superoxide with the help of a unique fluoroprobe MitoSOX based on fluorescence measurements in yeast MATERIALS AND METHODS: Wound healing property of successive extracts (ethyl acetate, methanol and aqueous) of S. cordifolia against dexamethasone-induced retardation of wound healing in rats was studied. The various extracts of S. cordifolia were characterised by determining the various phytochemicals and quantifying the total phenolic content and flavonoidal content by High throughput assays. In order to know the probable mechanism of action of the successive fractionates, assessed the antioxidant activity both by in-vitro (DPPH-assay) and in-vivo methods in wild-type Saccharomyces cerevisiae BY 4743 (WT) and knock-out strain (Δtrx2) against H2O2-induced stress mediated damages. The cell survival was evaluated after exposure to the oxidizing reagent (4 mM H2O2) by two methods which included the ability of cells to proliferate on solid or liquid medium. The cell membrane integrity/amount of mitochondrial ROS was determined by treating the strains with extract/standard in presence of H2O2 and propidium iodide (PI)/MitoSOX Red RESULTS: During the preliminary in-vivo wound healing study, the period for complete re-epithelialization of the wound tissue was reduced significantly (pin the treatment groups as compared to the negative control group. The formulation HF3 containing aqueous extract of S. cordifolia (SCA) showed highest wound healing potential against dexamethasone-retarded wounds in rats which justifies its traditional use. In the growth curve assay, the H2O2-induced growth arrest was restored by aqueous extract of S. cordifolia (SCA) in a concentration-dependent(pmanner both in the WT and Δtrx2 strains similar to the standard (ascorbic acid), H2O2 after 24 hours incubation which was also confirmed by the findings of CFU method. We got almost similar results of cell viability when stained with PI. The lower level of mitochondrial superoxide was indicated by a significant (preduction in the amount of MitoSOX stained cells, in the extract-treated group in contrast to the H2O2-stressed group. CONCLUSION It was concluded that HF3 can be applied topically in hydrogel form in the case of delayed wound healing caused by the steroidal drug-dexamethasone, aptly justifying its traditional use. Regarding its mechanism of action, our findings report that the potent adaptive response of SCA-treated WT and Δtrx2 strains towards intracellular ROS specifically mitochondrial-ROS confirms its antioxidant potential. Moreover, as SCA was able to rescue the Δtrx2 strains from stress, it can be inferred that it might be able to induce the enzyme thioredoxin-II to restore redox homeostasis. The findings with the conditional mutant ∆trx2 are the first proof linking SCA action related to particular cellular pathways which may be because of the phenols and flavonoids and their synergistic effect.
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Zair MA, Prasanthi D, Chennuri A, Hanthal ZR, Lakshmi PK. Effect of Transcutol and Stearylamine on Ibuprofen Hydrophilic Gel for Transdermal Delivery. INTERNATIONAL JOURNAL OF DRUG DELIVERY TECHNOLOGY 2018; 8. [DOI: 10.25258/ijddt.v8i01.11901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Transdermal drug delivery system (TDDS) shows promising results when compared with oral drug delivery system mainly by eliminating the first pass metabolism and by improving the bioavailability of drug. Hydrophilic gels are networks of polymer chains that are sometimes found as colloidal gels in which water is the dispersion medium. Ibuprofen, nonsteroidal anti-inflammatory drug used to relieve pain, reduces fever and anti-inflammation. The purpose of present research is to demonstrate the influence of various enhancers (transcutol and stearylamine) in various concentrations on percutaneous permeation of ibuprofen hydrophilic gel from HPMC K4M & HPMC K100M gel formulation. Gelling agents at various concentrations were preliminary screened for gel consistency. The control and the prepared gels were evaluated for clarity, homogeneity, spreadability, extrudability, drug content, invitro diffusion, ex-vivo permeation, skin irritation, anti-inflammatory activity and stability studies. All formulations have shown better physicochemical properties. Ex-vivo skin permeation studies reveals that the (IBU29) formulated using HPMC K4M 6%, transcutol 40% and stearylamine 4% as permeation enhancers has shown maximum drug release of 86.4 % for 24hrs. Permeability parameters like flux were found to be 1940.68±0.06µg/cm²/hr, permeability coefficient was found 31 ×10-3 cm/hr and Q24 was found to be 5240.82±0.06µg/cm² and enhancement ratio of 13.06 over pure drug. Skin irritation studies showed irritation potential of “0” score thus providing to be non-irritant. The anti-inflammation studies were performed with inflammation induced by carrageenan 1% w/v solution. Optimized formulation (IBU29) showed highest reduction of inflammation comparable to marketed preparation BRUGESIC GEL®. The formulations were stable at room temperature for 1 month.Key words: Transdermal gel, Ibuprofen, HPMC K4M, HPMC K100M, Penetration- enhancer..
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Zulal NA, Lakshmi PK. Enhancement of Solubility and Bioavailability of Candesartan Cilexetil using Natural P-Glycoprotein Inhibitors. TROP J PHARM RES 2015. [DOI: 10.4314/tjpr.v14i1.4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Prasanthi D, Lakshmi PK. Statistically optimised ethosomes for transdermal delivery of tolterodine tartrate. PAKISTAN JOURNAL OF PHARMACEUTICAL SCIENCES 2013; 26:1117-1122. [PMID: 24191315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The aim of the current investigation is to optimize ethosomes statistically for enhancing transdermal potential of Tolterodine Tartrate (TT). Ethosomes bearing TT were prepared by cold method and characterized for various parameters like vesicle size, vesicle shape, surface morphology and % drug entrapment. Microscopic examinations suggest ethosomes as spherical unilamellar vesicles with a smooth surface. Optimized ethosomal vesicles were of 890±2.67nm size and showed 79.83±3.18% drug entrapment. Ex-vivo permeation studies across rat skin resulted in increased flux of 4.69±0.24μg/cm(2)/hr and decreased lag time of 0.13±0.05 hr when compared with drug solution (0.546±0.05μg/cm(2)/hr, 3±0.2 hr).This shows enhancement of transdermal delivery by 8.82 times. Anatomical changes in skin samples due to vesicle-skin interaction were observed on histological examination. Optimized formulation on storage at 4°C for 120 days showed insignificant growth in vesicular size revealing low aggregation of vesicles. The results collectively suggest ethosomes as carriers for accentuated transdermal delivery of TT.
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Prasanthi D, Lakshmi PK. Synergistic effect of iontophoresis and chemical enhancers on transdermal permeation of tolterodine tartrate for the treatment of overactive bladder. Int Braz J Urol 2013; 39:63-75; discussion 76. [PMID: 23489517 DOI: 10.1590/s1677-5538.ibju.2013.01.09] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 09/24/2012] [Indexed: 11/21/2022] Open
Abstract
PURPOSE The objective of the study was to evaluate the synergistic transdermal permeation effect of chemical enhancers and iontophoresis technique on tolterodine tartrate (TT) transdermal gel and to evaluate its pharmacokinetic properties. MATERIALS AND METHODS Taguchi robust design was used for optimization of formulations. Skin permeation rates were evaluated using the Keshary-chein type diffusion cells in order to optimize the gel formulation. In-vivo studies of the optimized formulation were performed in a rabbit model and histopathology studies of optimized formulation were performed on rats. RESULTS Transdermal gels were formulated successfully using Taguchi robust design method. The type of penetration enhancer, concentration of penetration enhancer, current density and pulse on/off ratio were chosen as independent variables. Type of penetration enhancer was found to be the significant factor for all the responses. Permeation parameters were evaluated when maximum cumulative amount permeated in 24 hours (Q24) was 145.71 ± 2.00µg/cm² by CIT4 formulation over control (91.89 ± 2.30µg/cm²). Permeation was enhanced by 1.75 fold by CIT4 formulation. Formulation CIT4 containing nerolidol (5%) and iontophoretic variables applied (0.5mA/cm² and pulse on/off ratio 3:1) was optimized. In vivo studies with optimized formulation CIT4 showed increase in AUC and T1/2 when compared to oral suspension in rabbits. The histological studies showed changes in dermis indicating the effect of penetration enhancers and as iontophoresis was continued only for two cycles in periodic fashion so it did not cause any skin damage observed in the slides. CONCLUSION Results indicated that iontophoresis in combination with chemical enhancers is an effective method for transdermal administration of TT in the treatment of overactive bladder.
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Prasanthi D, Lakshmi PK. Terpenes: Effect of lipophilicity in enhancing transdermal delivery of alfuzosin hydrochloride. J Adv Pharm Technol Res 2013; 3:216-23. [PMID: 23378942 PMCID: PMC3560127 DOI: 10.4103/2231-4040.104712] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Transdermal drug delivery has attracted much attention as an alternative to intravenous and oral methods of delivery. But the main barrier is stratum corneum. Terpenes classes of chemical enhancers are used in transdermal formulations for facilitating penetration of drugs. The aim of the study is to evaluate terpenes as skin penetration enhancers and correlate its relationship with permeation and lipophilicity. In this study, alfuzosin hydrochloride (AH) hydrogels were prepared with terpenes using Taguchi orthogonal array experimental design. The formulations contained one of eight terpenes, based on their lipophilicity (log P 2.13-5.36). The percutaneous permeation was studied in rat skin using diffusion cell technique. Flux, cumulative amount, lag time and skin content of AH were measured over 24 hours and compared with control gels. Nerolidol with highest lipophilicity (log P 5.36 ± 0.38) showed highest cumulative amount (Q24) of 647.29 ± 18.76 μg/cm2 and fluxrateof 28.16 ± 0.64 μg/cm2/hour. It showed decreased lag time of 0.76 ± 0.15 hours. Fenchone (2.5%) (log P 2.13 ± 0.30) produced the longest lag time 4.8 ± 0.20 hours. The rank order of enhancement effect was shown as nerolidol > farnesol > limonene > linalool > geraniol > carvone > fenchone > menthol. Lowest skin content was seen with carvone. Increase in lipophilicity of terpenes showed increase in flux, cumulative amount (Q24), and enhancement ratio which was significant with P < 0.000. But lag time was decreased and no correlation was found between lipophilicity and skin content. Histological studies showed changes in dermis which can be attributed to disruption of lipid packing of stratum corneum due to effect of nerolidol within lipid lamellae. It was found that small alcoholic terpenes with high degree of unsaturation enhance permeation of hydrophilic drugs, liquid terpenes enhance better than solid terpenes and terpenes with high lipophilicity are good penetration enhancers.
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Lakshmi PK, Kalpana B, Prasanthi D. Invasomes-novel Vesicular Carriers for Enhanced Skin Permeation. ACTA ACUST UNITED AC 2013. [DOI: 10.4103/0975-8453.135837] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Prasanthi D, Lakshmi PK. Effect of chemical enhancers in transdermal permeation of alfuzosin hydrochloride. ISRN PHARMACEUTICS 2012; 2012:965280. [PMID: 23316394 PMCID: PMC3539352 DOI: 10.5402/2012/965280] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 11/20/2012] [Indexed: 11/23/2022]
Abstract
The objective of the present study is to explore the efficient chemical penetration enhancer among the various enhancers available in overcoming the stratum corneum barrier in transdermal delivery of Alfuzosin hydrochloride (AH). The different enhancers were incorporated in 2% Carbopol gel which was selected as a control and evaluated by in vitro diffusion studies through dialysis membrane and permeation through the rat abdominal skin using Keshary-Chien diffusion cells. All the enhancers increased the release rate through the dialysis membrane when compared with control except oleic acid which decreased the release rate but showed maximum solubility of the drug. Among the various enhancers Transcutol 20% and tween-20 (2%) showed the highest cumulative amount (Q(24)) of 702.28 ± 6.97 μg/cm(2) and 702.74 ± 7.49 μg/cm(2), respectively. A flux rate of 31.08 ± 0.21 μg/cm(2)/hr by Transcutol 20% and 30.38 ± 0.18 μg/cm(2)/hr by tween-20 (2%) was obtained. Transcutol 20% showed decreased lag time of 0.13 ± 0.05 hr. The lowest skin content of 342.33 ± 5.30 μg/gm was seen with oleic acid 2.5%. Maximum enhancement of flux by 3.94-fold was obtained with transcutol 20%. Primary skin irritation studies were performed with rabbit. Histopathological studies of transcutol 20% showed marked changes such as degeneration and infiltration of mononuclear cells in dermis indicating the effect of transcutol on the skin. Among the different enhancers transcutol is efficient in enhancing transdermal delivery of AH.
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Prasanthi D, Lakshmi PK. Development of ethosomes with taguchi robust design-based studies for transdermal delivery of alfuzosin hydrochloride. ACTA ACUST UNITED AC 2012. [DOI: 10.3329/icpj.v1i11.12063] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In the present investigation efficiency of ethosomes as novel lipid carriers for transdermal delivery of Alfuzosin Hydrochloride (AH) has been evaluated. Taguchi robust design method was used for optimization of ethosomal formulations. Phospholipid type, concentration of phospholipid and concentration of ethanol was selected as independent variables and their effect on the dependent variables (entrapment efficiency and flux) was studied. Ethosomal formulation (EA8) with soya phosphatidylcholine (3%) and ethanol 20% were optimized. Vesicles were spherical, unilamellar with smooth surface. The optimized formulation exhibited vesicle size (6.85 ± 1.35µm), zeta potential (-8.14 ± 0.62mv), entrapment efficiency (91.86 ± 3.25%), flux (27.42 ± 0.04µg/cm2/hr), lag time (0.26±0.20hr) and skin deposition (298.01 ± 15.4µg/g). Transdermal flux was enhanced by 6.92 times over drug solution. Vesicle skin interaction studies showed fatty change in the dermis. The formulations were stable at 4°C for 120 days. Results suggested ethosomes as efficient carriers for AH transdermal delivery.DOI: http://dx.doi.org/10.3329/icpj.v1i11.12063 International Current Pharmaceutical Journal 2012, 1(11): 370-375
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Abstract
Taste is an important organoleptic property governing acceptance of products for administration through mouth. But majority of drugs available are bitter in taste. For patient acceptability and compliance, bitter taste drugs are masked by adding several flavoring agents. Thus, taste assessment is one important quality control parameter for evaluating taste-masked formulations. The primary method for the taste measurement of drug substances and formulations is by human panelists. The use of sensory panelists is very difficult and problematic in industry and this is due to the potential toxicity of drugs and subjectivity of taste panelists, problems in recruiting taste panelists, motivation and panel maintenance are significantly difficult when working with unpleasant products. Furthermore, Food and Drug Administration (FDA)-unapproved molecules cannot be tested. Therefore, analytical taste-sensing multichannel sensory system called as electronic tongue (e-tongue or artificial tongue) which can assess taste have been replacing the sensory panelists. Thus, e-tongue includes benefits like reducing reliance on human panel. The present review focuses on the electrochemical concepts in instrumentation, performance qualification of E-tongue, and applications in various fields.
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Abstract
P-glycoprotein (P-gp), a transmembrane permeability glycoprotein, is a member of ATP binding cassette (ABC) super family that functions specifically as a carrier mediated primary active efflux transporter. It is widely distributed throughout the body and has a diverse range of substrates. Several vital therapeutic agents are substrates to P-gp and their bioavailability is lowered or a resistance is induced because of the protein efflux. Hence P-gp inhibitors were explored for overcoming multidrug resistance and poor bioavailability problems of the therapeutic P-gp substrates. The sensitivity of drug moieties to P-gp and vice versa can be established by various experimental models in silico, in vitro and in vivo. Ever since the discovery of P-gp, the research plethora identified several chemical structures as P-gp inhibitors. The aim of this review was to emphasize on the discovery and development of newer, inert, non-toxic, and more efficient, specifically targeting P-gp inhibitors, like those among the natural herb extracts, pharmaceutical excipients and formulations, and other rational drug moieties. The applications of cellular and molecular biology knowledge, in silico designed structural databases, molecular modeling studies and quantitative structure-activity relationship (QSAR) analyses in the development of novel rational P-gp inhibitors have also been mentioned.
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Mohana Raghava Srivalli K, Lakshmi PK, Balasubramaniam J. Design of a novel bilayered gastric mucoadhesive system for localized and unidirectional release of lamotrigine. Saudi Pharm J 2012; 21:45-52. [PMID: 24109205 DOI: 10.1016/j.jsps.2012.01.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Accepted: 01/13/2012] [Indexed: 11/19/2022] Open
Abstract
Lamotrigine is a BCS class II drug with pH dependent solubility. The bilayered gastric mucoadhesive tablets of lamotrigine were designed such that the drug and controlled release polymers were incorporated in the upper layer and the lower layer had the mucoadhesive polymers. The major ingredients selected for the upper layer were the drug and control release polymer (either HPMC K15M or polyox) while the lower MA layer predominantly comprised of Carbopol 974P. A 2(3) full factorial design was constructed for this study and the tablets were optimized for parameters like tablet size, shape, ex vivo mucoadhesive properties and unidirectional drug release. Oval tablets with an average size of 14 mm diameter were set optimum. Maximum mucoadhesive bond strength of 79.3 ± 0.91 * 10(3) dyn/cm(2) was achieved with carbopol when used in combination with a synergistic resin polymer. All the tested formulations presented a mucoadhesion time of greater than 12 h. The incorporation of methacrylic polymers in the lower layer ensured unidirectional drug release from the bilayered tablets. The unidirectional drug release was confirmed after comparing the dissolution results of paddle method with those of a modified basket method. Model independent similarity and dissimilarity factor methods were used for the comparison of dissolution results. Controlled drug release profiles with zero order kinetics were obtained with polyox and HPMC K15M which reported t 90% at 6th and 12th hours, respectively. The "n" value with polyox was 0.992 and that with HPMC K15M was 0.946 indicating an approximate case II transport. These two formulations showed the potential for oral administration of lamotrigine as bilayered gastric mucoadhesive tablets by yielding highest similarity factor values, 96.06 and 92.47, respectively, between the paddle and modified basket method dissolution release profiles apart from reporting the best tablet physical properties and maximum mucoadhesive strength.
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Key Words
- #, sieve number
- %, percentage
- 23 full factorial design
- API, active pharmaceutical ingredient
- BCS, biopharmaceutical classification system
- BGMT, bilayered gastric mucoadhesive tablets
- Bilayered gastric mucoadhesive tablets
- CR layer, control release layer
- G, grams
- HCl, hydrochloric acid
- Lamotrigine
- MA layer, mucoadhesive layer
- MDT, mean dissolution time
- Methacrylic polymers
- Mg, milligrams
- Modified basket dissolution model
- USP, United States pharmacopoeia
- UV, ultra violet
- Unidirectional drug release
- Zero order release
- cms, centimetres
- f1, difference factor
- f2, similarity factor
- h, hours
- mL, millilitre
- min, minute
- mm, millimetre
- n, release exponent (power law Korsmeyer Peppas equation)
- nm, nanometre
- r2, correlation coefficient
- rpm, revolution per minute
- sec, seconds
- °C, degrees centigrade
- ≈, approximately equivalent to
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Lakshmi PK, Sridharan A, Sreekanth J. Formulation development of fast releasing oral thin films of levocetrizine dihydrochloride with Eudragit®Epo and optimization through Taguchi orthogonal experimental design. ASIAN JOURNAL OF PHARMACEUTICS 2011. [DOI: 10.4103/0973-8398.84548] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Remya KS, Joseph S, Lakshmi PK, Akhila S. Microsatellites in varied arenas of research. JOURNAL OF PHARMACY AND BIOALLIED SCIENCES 2010; 2:141-3. [PMID: 21814449 PMCID: PMC3147099 DOI: 10.4103/0975-7406.67004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 03/23/2010] [Accepted: 05/15/2010] [Indexed: 11/21/2022] Open
Abstract
Microsatellites known as simple-sequence repeats (SSRs) or short-tandem repeats (STRs), represent specific sequences of DNA consisting of tandemly repeated units of one to six nucleotides. The repetitive nature of microsatellites makes them particularly prone to grow or shrink in length and these changes can have both good and bad consequences for the organisms that possess them. They are responsible for various neurological diseases and hence the same cause is now utilized for the early detection of various diseases, such as, Schizophrenia and Bipolar Disorder, Congenital generalized Hypertrichosis, Asthma, and Bronchial Hyperresponsiveness. These agents are widely used for forensic identification and relatedness testing, and are predominant genetic markers in this area of application. The application of microsatellites is an extending web and covers the varied scenarios of science, such as, conservation biology, plant genetics, and population studies. At present, researches are progressing round the globe to extend the use of these genetic repeaters to unmask the hidden genetic secrets behind the creation of the world.
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Kotwani A, Ewen M, Dey D, Iyer S, Lakshmi PK, Patel A, Raman K, Singhal GL, Thawani V, Tripathi S, Laing R. Prices & availability of common medicines at six sites in India using a standard methodology. Indian J Med Res 2007; 125:645-54. [PMID: 17642500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023] Open
Abstract
BACKGROUND & OBJECTIVE The price and availability of medicines are key components in determining access to effective treatment. Data on prices and availability of common medicines in public and private sector in different States of India are scarce. Hence, surveys were undertaken in different States of India to evaluate these metrics. METHODS During October 2004 to January 2005, six surveys were undertaken simultaneously in five States of India to assess medicine prices and availability of essential medicines (n = 21-28) using the World Health Organization and Health Action International methodology. Surveys were conducted at Chennai, Haryana, Karnataka, West Bengal, and at two sites in Maharashtra. For each medicine, data were collected for the Innovator Brand (IB), Most Sold Generic (MSG), and Lowest Priced Generic (LPG) at randomly selected public and private facilities in each site surveyed. Prices were compared to an international reference benchmark (expressed as median price ratio - MPR). RESULTS The procurement price of medicines in the public sector was 0.27 to 0.48 times the international reference price. However, these medicines were inadequately available and the median availability in the public sector ranged from 0 to 30 per cent. The median prices of medicines in the private sector were less than twice the IRP, although a few innovator brands were more expensive. No difference was observed between the prices of the most sold generic (MSG) and the lowest priced generic (LPG) available at the facilities. Interestingly, price variation was observed among different generic equivalents of ciprofloxacin in each region. The price of LPG diazepam in the private sector was thirty three times its procurement price in the public sector. INTERPRETATION & CONCLUSION The survey revealed low procurement prices and poor availability in the public sector. Thus, the majority of the population purchased medicines from private pharmacies, where generics were usually available although prices of certain medicines were high. Various policy measures could increase the availability and accessibility of medicines for the population.
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Lakshmi PK, Devi GS, Bhaskaran S, Sacchidanand S. Niosomal methotrexate gel in the treatment of localized psoriasis: Phase I and phase II studies. Indian J Dermatol Venereol Leprol 2007; 73:157-61. [PMID: 17558046 DOI: 10.4103/0378-6323.32709] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Efficacy of topical methotrexate in psoriasis is limited by its penetration. AIMS The study involved the preparation of niosomal methotrexate in chitosan gel and to test the same for irritation and sensitization on healthy human volunteers followed by assessing the efficacy of the gel through double-blind placebo-controlled study on psoriasis patients and also comparing its efficacy with a marketed methotrexate gel. METHODS The methotrexate niosomes were prepared by lipid layer hydration method. The characterized niosomes were incorporated in chitosan gel. The gels were tested on 10 human volunteers to check for irritation and skin sensitivity by human repeated insult patch test (HRIPT). The formulations were assessed for efficacy by double-blind placebo-controlled study in 10 psoriasis patients for each formulation. The efficacy was calculated by psoriasis area and severity index scoring method. The global score was used to assess the progress of the disease. RESULTS The HRIPT test did not produce any significant irritation or sensitization on healthy human volunteers. The placebo and marketed gels were compared with niosomal methotrexate gel. At Week 12, with niosomal methotrexate gel, there was reduction in total score from 6.2378+/-1.4857 to 2.0023+/-0.1371. CONCLUSION These results suggest that niosomal methotrexate gel is more efficacious than placebo and marketed methotrexate gel.
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