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Maheshwari N, Maheshwari N, Mishra DK, Goyal A. Phytotherapeutic Potential of Natural Herbal Medicines for Management of Psoriasis: Current Status. Pharmacognosy Res 2022. [DOI: 10.5530/097484900261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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Verma P, Maheshwari N, Bairagee D. Physiochemical Characterization and in vitro Evaluation of Formulated Herbal Bioactive Loaded Transdermal Patches. Pharmacognosy Res 2022. [DOI: 10.5530/097484900244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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Maheshwari N, Karthikeyan C, Bhadada SV, Verma AK, Sahi C, Moorthy NHN, Trivedi P. Virtual Screening Based Discovery of PTP1B Inhibitors and Their Biological Evaluations. LETT DRUG DES DISCOV 2021. [DOI: 10.2174/1570180817999200826174051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background :
The discovery of novel antidiabetics for the treatment of type 2 diabetes
mellitus (T2DM) is an important task nowadays because the current treatment approaches have certain
limitations. The reported studies showed that the protein tyrosine phosphatase 1B (PTP1B) is a
valuable target, can be used to develop significant antidiabetic molecules.
Objective:
In the present investigation, computational methods and biological evaluation studies have
been applied to develop novel PTP1B inhibitors with good enzyme binding affinity and activity.
Methods:
Virtual screening (docking) analysis of SPECS database compounds on PTP1B enzyme
was performed using Schrodinger software. In vitro and in vivo biological evaluations had been
conducted with the identified hits.
Results:
The results revealed that the molecules identified through these studies have shown significant
interactions with the active site residues of the PTP1B enzyme. The compounds S1 and S2 provided
significant binding interactions with the residues (Arg221 and Gln262) and have shown considerable
in vitro PTP1B inhibitory activity and in vivo antidiabetic activity. The compounds S1 and
S2 possessed 35.44±0.12% and 33.68±0.08% inhibitory activities, respectively.
Conclusion:
These identified hits will be used as a template for design and development of novel
PTP1B inhibitors with a compatible pharmacokinetic profile.
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Affiliation(s)
- Neelesh Maheshwari
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Airport Bypass Road, Gandhi Nagar, Bhopal (MP)-462036, India
| | - Chandrabose Karthikeyan
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Airport Bypass Road, Gandhi Nagar, Bhopal (MP)-462036, India
| | - Shraddha V. Bhadada
- Department of Pharmacology, Institute of Pharmacy, Nirma University, Ahmedabad 382481, Gujarat, India
| | - Amit K. Verma
- Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, Madhya Pradesh 462066, India
| | - Chandan Sahi
- Department of Biological Sciences, Indian Institute of Science Education and Research, Bhopal, Madhya Pradesh 462066, India
| | - N.S. Hari Narayana Moorthy
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Airport Bypass Road, Gandhi Nagar, Bhopal (MP)-462036, India
| | - Piyush Trivedi
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Airport Bypass Road, Gandhi Nagar, Bhopal (MP)-462036, India
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Maheshwari N, Choudhary J, Rath A, Shinde D, Kalita K. Finite Element Analysis and Multi-criteria Decision-Making (MCDM)-Based Optimal Design Parameter Selection of Solid Ventilated Brake Disc. ACTA ACUST UNITED AC 2021. [DOI: 10.1007/s40032-020-00650-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Chowdhury AR, Maheshwari N, Soni J, Kapil M, Mehta T, Mukharya A. Quantitative X-ray fluorescence analysis: Trace level detection of toxic elemental impurities in drug product by ED-XRF spectrometer. J Pharm Biomed Anal 2020; 189:113292. [PMID: 32645616 DOI: 10.1016/j.jpba.2020.113292] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 03/24/2020] [Accepted: 03/26/2020] [Indexed: 11/17/2022]
Abstract
Inorganic impurity analysis of pharmaceutical drug products is of paramount importance at trace levels due to the availability of toxic metals. The existing techniques require extensive development and chemical treatment to evaluate the presence of class I (Pb, Cd, Hg and As) and class II (Co, V and Ni) heavy metal elements which are harmful to the environment. To overcome these issues, a cost and time effective wavelength dispersive X-ray fluorescence spectrometry (XRF) was introduced to determine the concentration of trace elements in one of the angiotensin receptor blocker (ARB) (tablet sample 300 mg) according to guidelines addressed in ICH Q3D and USP. The validation study focused on class I and class II elements are also in accordance with regulatory guidelines. Overall it includes the comprehensive characterization of analytical method which is compliant with the requirement of USP. The novelty of this work includes the application of EDXRF in routine analysis of trace elements (especially volatile Hg) present in the pharmaceutical product beyond the previously published studies for the limited number of the non-pharmaceutical regime. Apart from this it also requires minimal sample preparation and method development and is able to quantify toxic impurities which are present in the sample in less than 20 ppm concentration, with the lowest level of detection up to 0.1 ppm.
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Affiliation(s)
| | | | - Jigar Soni
- Amneal Pharmaceuticals Pvt. Ltd., Ahmedabad, 382213, India
| | - Mona Kapil
- Amneal Pharmaceuticals Pvt. Ltd., Ahmedabad, 382213, India
| | - Tushar Mehta
- Amneal Pharmaceuticals Pvt. Ltd., Ahmedabad, 382213, India
| | - Amit Mukharya
- Amneal Pharmaceuticals Pvt. Ltd., Ahmedabad, 382213, India
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Maheshwari N, Sarwar A, Weinstein J, Ahmed M, Ali A. Abstract No. 650 Percutaneous debridement of partial hepatic necrosis due to hepatic artery thrombosis after liver transplantation. J Vasc Interv Radiol 2020. [DOI: 10.1016/j.jvir.2019.12.711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Maheshwari N, Karthikeyan C, Bhadada SV, Verma AK, Sahi C, Moorthy NHN, Trivedi P. Design, synthesis and biological evaluation of some tetrazole acetamide derivatives as novel non-carboxylic PTP1B inhibitors. Bioorg Chem 2019; 92:103221. [DOI: 10.1016/j.bioorg.2019.103221] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 07/05/2019] [Accepted: 08/26/2019] [Indexed: 12/11/2022]
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Maheshwari N, Karthikeyan C, Trivedi P, Moorthy NSHN. Recent Advances in Protein Tyrosine Phosphatase 1B Targeted Drug Discovery for Type II Diabetes and Obesity. Curr Drug Targets 2019; 19:551-575. [PMID: 28228082 DOI: 10.2174/1389450118666170222143739] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 02/14/2017] [Accepted: 02/18/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND Protein tyrosine phosphatase 1B (PTP1B) is an important therapeutic target for type II diabetes and obesity because of its pivotal role as a negative modulator in both insulin and leptin signalling pathways. OBJECTIVE The discovery of PTP1B inhibitors has been the focus of researchers in both academia and pharmaceutical industry over the last two decades. RESULTS AND CONCLUSION Though, intense pharmaceutical research in this area has resulted in many potent PTP1B inhibitors, a vast majority of them possessed pTyr mimetic group such as phosphonates, carboxylic acids and sulphamic acids, which led to poor PTP1B selectivity and insufficient in vivo efficacy due to low cell permeability and bioavailability. The availability of X-ray crystallographic structures of PTP1B together with the application of molecular modelling and other innovative strategies led to the development of many potent and selective PTP1B inhibitors with desirable physicochemical properties. This review traces the development of PTP1B inhibitors over the last decade and also records novel PTP1B inhibitors developed recently with greater emphasis on their selectivity and cell permeability.
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Affiliation(s)
- Neelesh Maheshwari
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Airport Bypass Road, Gandhi Nagar, Bhopal (MP)-462036, India
| | - Chandrabose Karthikeyan
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Airport Bypass Road, Gandhi Nagar, Bhopal (MP)-462036, India
| | - Piyush Trivedi
- School of Pharmaceutical Sciences, Rajiv Gandhi Proudyogiki Vishwavidyalaya, Airport Bypass Road, Gandhi Nagar, Bhopal (MP)-462036, India
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Sahni N, Mandal AK, Maheshwari N. Secondary viral encephalitis in a patient with pyogenic liver abscess. Anaesth Intensive Care 2014; 42:528-530. [PMID: 24967776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
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Rahmani H, Maheshwari N, Srianand R. Constraining the variation in the fine-structure constant using SDSS DR7 quasi-stellar object spectra. ACTA ACUST UNITED AC 2014. [DOI: 10.1093/mnrasl/slt183] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Maheshwari N, Goyal A, Jain S. 2D-QSAR study of 1,4-benzodiazepine-2-ones as potent anti-trypanosomal agents. Med Chem Res 2013. [DOI: 10.1007/s00044-013-0592-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Maheshwari N, Goyal A, Jain S, Jain D, Moorthy NSHN. Atom based 3D-QSAR study of 1,4-benzodiazepine-2-ones as potent anti-trypanosomal agents and its validation. Med Chem Res 2013. [DOI: 10.1007/s00044-013-0675-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mittal M, Maheshwari N, Ahlawat K, Sharma V, Sultan A, Chopra R. Detection of orbicularis oris muscle defects in first degree relatives of cleft lip children using ultrasound. J Indian Soc Pedod Prev Dent 2012; 30:237-41. [PMID: 23263428 DOI: 10.4103/0970-4388.105017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVE The severity of cleft lip (CL) varies considerably from complete bilateral CL and palate at one end of the spectrum to a minimal CL at the other. In some cases of microform clefting, there may be no visible manifestation of the defect on the lip surface (i.e., the defect is occult) and no residual functional deficit. This study used high resolution ultrasonography to detect subclinical anomalies of orbicularis oris muscle (OOM) in first degree relatives of CL +- cleft palate children and compared it with controls. MATERIALS AND METHODS Thirty relatives of 25 children with non-syndromic CL or CL+ CP were identified for the study. Thirty subjects having negative family history of CL/P in three generations and absence of any minimal cleft features were taken as controls. Ultrasound scans of OOM of all the controls and relatives were taken. Statistical analysis was performed using standard χ2 tests with Yates correction. RESULTS Defects were seen in 13.3% of relatives and no defects were seen in controls, this was not statistically significant. CONCLUSION The data support the hypothesis that subclinical CL cases with subepithelial OOM defects do exist and Orbicularis oris discontinuities represent the mildest form of CL.
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Affiliation(s)
- M Mittal
- Department of Pediatric Denistry, SGT Dental College, Gurgaon, Haryana, India.
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Janipalli CS, Kumar MVK, Vinay DG, Sandeep MN, Bhaskar S, Kulkarni SR, Aruna M, Joglekar CV, Priyadharshini S, Maheshwari N, Yajnik CS, Chandak GR. Analysis of 32 common susceptibility genetic variants and their combined effect in predicting risk of Type 2 diabetes and related traits in Indians. Diabet Med 2012; 29:121-7. [PMID: 21913964 DOI: 10.1111/j.1464-5491.2011.03438.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
AIMS Recent genome-wide association studies have identified several Type 2 diabetes-related loci. We investigated the effect of susceptibility genetic variants, individually, together and in combination with conventional risk factors, on Type 2 diabetes and diabetes-related traits in Indians. METHODS We genotyped 33 variants in 1808 Indian patients and 1549 control subjects and performed association analyses with Type 2 diabetes and related traits using an additive model for individual variant and for genetic risk score based on 32 polymorphisms. The discriminatory value of genetic risk over conventional risk factors was analysed using receiver-operating characteristics curve analysis. RESULTS The allelic odds ratio ranged from 1.01 (95% CI 0.85-1.19) to 1.66 (95% CI 1.32-2.01) for single-variant analyses. Although, only 16 variants had significant odds ratios, the direction of association for others was similar to earlier reports. The odds ratio for Type 2 diabetes at each genetic risk score point was 1.11 (95% CI 1.09-1.14; P = 5.6 × 10(-17)) and individuals with extremes of genetic risk score (≥ 29.0 and ≤ 17.0) had a 7.5-fold difference in risk of Type 2 diabetes. The discrimination rate between control subjects and patients improved marginally on addition of genetic risk score to conventional risk factors (area under curve = 0.959 and 0.963, respectively; P = 0.001). Of all the quantitative traits analysed, MC4R variants showed strong association with BMI (P = 4.1 × 10(-4)), fat mass per cent (P = 2.4 × 10(-4)) and other obesity-related traits, including waist circumference and hip circumference (P = 2.0 × 10(-3) for both), as well as insulin resistance (P =0.02). CONCLUSIONS We replicated the association of well-established common variants with Type 2 diabetes in Indians and observed a similar association as reported in Western populations. Combined analysis of 32 variants aids identification of subgroups at increased risk of Type 2 diabetes, but adds only a minor advantage over conventional risk factors.
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Affiliation(s)
- C S Janipalli
- Centre for Cellular and Molecular Biology, Council of Scientific and Industrial Research, Hyderabad, India
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Manaktala C, Singh AK, Verma M, Sachdeva A, Sharma H, Roy A, Jalali RK, Gowrishankar R, Kumar A, Kumar AS, Jayaraman AM, Swarnkar B, Srinivas CR, Nayak C, Duttaroy D, Umrigar D, Jesudanam M, Maheshwari N, Shetty P, Singh RP, Ghate S, Sacchidanand S, Tolat S, Bhoira S, Marfatia Y. Efficacy and tolerability of cefditoren pivoxil in uncomplicated skin and skin structure infections in Indian patients. Indian J Dermatol 2010; 54:350-6. [PMID: 20101337 PMCID: PMC2807712 DOI: 10.4103/0019-5154.57612] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Background: Uncomplicated skin and skin structure infections (uSSSI) are commonly encountered community-acquired infections and are typically confined to the superficial layers of the skin. Hence, they seldom lead to the destruction of skin structures. Aims: To evaluate the efficacy and tolerability of cefditoren pivoxil in uSSSI in Indian patients. Methods: One hundred and seventy-eight patients diagnosed with uncomplicated SSSI were enrolled in this randomized, comparative, multicentric study. Patients received either cefditoren pivoxil or cefdinir for ten days. Efficacy was assessed both clinically and microbiologically. Safety evaluation consisted of reporting of type, frequency, severity, and causal relationship of adverse events. Results: One hundred and fifty-one patients completed the study. Clinical and bacteriological efficacy of cefditoren pivoxil was comparable to that of cefdinir in the treatment of uSSSI. One hundred and five patients were eligible for per protocol (PP) analysis of bacteriological outcome and clinical efficacy. Clinical cure or improvement was achieved in 98.00% patients treated with cefditoren pivoxil and 98.18% patients treated with cefdinir. In the modified Intent to Treat (mITT) patient population, clinical cure or improvement was recorded in 97.33% patients treated with cefditoren pivoxil and 96.20% patients treated with cefdinir. Microbiological eradication (or presumed eradication) was recorded in 88.00% patients treated with cefditoren pivoxil and 94.55% patients treated with cefdinir. The above differences in the outcome rates between the two drugs were not statistically significant. Six adverse events (AEs) (two in cefditoren group and four in cefdinir group) were reported in this study. Conclusion: Cefditoren pivoxil 200 mg b.i.d. was effective and well tolerated in the treatment of uSSSI.
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Affiliation(s)
- Charu Manaktala
- Medical Affairs and Clinical Research, Ranbaxy Laboratories Ltd, 77-B, IFFCO Road, Sector-18, Udyog Vihar Industrial Area, Gurgaon, Haryana, India.
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Maheshwari N, Zaiwalla Z, McShane MA. Management of infantile spasms in a regional centre before and after the United Kingdom infantile spasms study (UKISS). Arch Dis Child 2008; 93:448. [PMID: 18426942 DOI: 10.1136/adc.2008.137125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Mittal SR, Maheshwari N. Present status of various inotropic agents in heart failure. J Assoc Physicians India 2001; 49:1095-9. [PMID: 11868865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Affiliation(s)
- S R Mittal
- Department of Cardiology, JLN Medical College, Ajmer
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Abstract
We have been able to isolate the cyanobacterium Microcystis aeruginosa from water samples of ponds and river where patients of rhinosporidiosis were bathing. It is likely that this cyanobacterium is the causative agents of this disease. The bluish-green cells of M. aeruginosa also have a colorless small cell stage called nanocyte which has been detected in clear waters of all the pond and river samples studied. Both large cells and nanocytes of M. aeruginosa could be recognized inside the round bodies of rhinosporidiosis by light and electron microscopy. Further work on culturing this organism from excised samples and evaluation for drug therapy are in progress. It is hoped that, if therapy becomes available, no surgery would be required for this disease. It is suggested that the waters from ponds and lakes, as well as municipal and recreational waters, be checked for the nanocyte stage of M. aeruginosa. Etiological controversies of rhinosporidiosis have been reasonably solved. The new findings justify a change in the name "rhinosporidiosis" that had been associated with the fungus Rhinosporidium Seeberi.
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Affiliation(s)
- K B Ahluwalia
- Department of Biophysics, All India Institute of Medical Sciences, New Delhi, India
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Newmark HL, Lipkin M, Maheshwari N. Colonic hyperproliferation induced in rats and mice by nutritional-stress diets containing four components of a human Western-style diet (series 2). Am J Clin Nutr 1991; 54:209S-214S. [PMID: 2053564 DOI: 10.1093/ajcn/54.1.209s] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
In a previous study colonic hyperplasia and hyperproliferation were induced in mice and rats by a nutritional-stress diet, based on the AIN-76A semisynthetic diet modified to contain four suggested high-risk components of the human Western-style diet: increased fat and phosphate and decreased calcium and vitamin D contents. In this study the effect of raising calcium alone to near the median level (0.22 mg/kcal) and to a high level (1.3 mg/kcal), comparable to adult human dietary intake, was tested in mice and rats while retaining the three other high-risk components. With median calcium intake the nutritional-stress diet induced hyperproliferation of epithelial cells in colonic crypts, with increased numbers of proliferating cells in crypt columns in sigmoid colon of mice (P less than 0.001) and rats (P = 0.02) and in the ascending colon of mice (P = 0.01). With high calcium intake, hyperproliferation was reduced almost to control amounts in the presence of unchanged fat, phosphate, and vitamin D.
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Affiliation(s)
- H L Newmark
- Memorial Sloan-Kettering Cancer Center, New York, NY 10021
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Newmark HL, Lipkin M, Maheshwari N. Colonic hyperplasia and hyperproliferation induced by a nutritional stress diet with four components of Western-style diet. J Natl Cancer Inst 1990; 82:491-6. [PMID: 2313721 DOI: 10.1093/jnci/82.6.491] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
We studied the effects of specific nutritional modifications on colonic epithelial cell proliferation in mice and rats. The nutritional stress diet developed for this study was based on the AIN (American Institute of Nutrition)-76A semisynthetic diet, modified to contain four suggested risk factors of the human Western-style diet: increased fat and phosphate and decreased calcium and vitamin D content. We fed diets to mice and rats for 12 weeks beginning at 3 weeks of age. Hyperplasia developed in both sigmoid and ascending colon of mice and rats with lengthening of colonic crypts. Hyperproliferation developed in the sigmoid colon of mice and rats, and in the ascending colon of rats, with increased [3H]thymidine-labeling of epithelial cells. Thus, in colonic mucosa, the nutritional stress diet, which included risk factors of a Western-style diet, induced changes that occur in carcinogen-induced rodent models and in humans who are at increased risk for colonic neoplasia.
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Affiliation(s)
- H L Newmark
- Laboratory of Gastrointestinal Cancer Research, Memorial Sloan-Kettering Cancer Center, New York, NY 10021
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Khurana JP, Tamot BK, Maheshwari N, Maheshwari SC. Role of Catecholamines in Promotion of Flowering in a Short-Day Duckweed, Lemna paucicostata 6746. Plant Physiol 1987; 85:10-2. [PMID: 16665638 PMCID: PMC1054191 DOI: 10.1104/pp.85.1.10] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
l-Epinephrine, l-norepinephrine, and l-isoproterenol substantially promote flowering under a photoperiodic regime of 8 hours light and 16 hours darkness in Lemna paucicostata 6746 when grown on the modified Bonner-Devirian medium devoid of ethylenediaminetetraacetic acid. If catecholamines are provided to plants at 10(-4) molar level prior to transferring them to the short-day regime, they not only induce more floral primordia but also significantly improve flower development and sustain the flowers for a longer period. Propranolol (10(-4) molar), a beta-adrenergic blocking agent, partially suppresses flowering and the inhibition of flowering is relieved by catecholamines.
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Affiliation(s)
- J P Khurana
- Unit for Plant Cell and Molecular Biology and Department of Botany, University of Delhi, Delhi-110007, India
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Tyagi AK, Bharal S, Rashid A, Maheshwari N. Plant regeneration from tissue cultures initiated from immature inflorescences of a grass,Echinochloa colonum (L.) link. Plant Cell Rep 1985; 4:115-117. [PMID: 24253738 DOI: 10.1007/bf00571293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/1984] [Revised: 02/27/1985] [Indexed: 06/02/2023]
Abstract
Organised structures develop on a white and compact callus initiated from small segments of immature inflorescences ofEchinochloa colonum cultured on Murashige and Skoog's (MS) medium supplemented with 5.0 mg/l 2,4-dichlorophenoxyacetic acid (2,4-D) and 10% coconut milk. These develop into plantlets upon subculture onto MS medium containing 0 or 0.2 mg/l 2,4-D. Twelve out of 17 plantlets regenerated grew well on transfer to soil and eleven plants produced seeds.
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Affiliation(s)
- A K Tyagi
- Unit for Plant Cell and Molecular Biology and Department of Botany, University of Delhi, 110007, Delhi, India
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