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Harish G, Shetty U, Varamballi P, Mukhopadhyay C, Jagadesh A. Optimization of an allelic discrimination real-time RT-PCR assay for detection of H275Y oseltamivir resistance gene mutation among influenza A(H1N1)pdm09 patients from 2020 to 2022. J Med Virol 2024; 96:e29427. [PMID: 38288882 DOI: 10.1002/jmv.29427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 01/06/2024] [Accepted: 01/14/2024] [Indexed: 02/01/2024]
Abstract
Influenza virus is known to cause mild to severe respiratory infections and is also prone to genetic mutations. Of all the mutations, neuraminidase (NA) gene mutations are a matter of concern, as most approved antivirals target this protein. During the 2020 influenza season, an emergence of mutation in the NA gene, affecting the binding of the World Health Organization (WHO)-recommended probes to the specific site of the NA gene, was reported by our group. As a result of this mutation, the WHO-recommended allelic discrimination real-time reverse transcriptase polymerase chain reaction (RT-PCR) assay was unable to detect wild-type (H275) or mutant oseltamivir-resistant (Y275) strains of influenza A(H1N1)pmd09 viruses. In the current study, the WHO-recommended probes were redesigned according to the mutation in the probe binding site. Fifty undetermined samples (2020-2021) from the previous study were retested with the newly designed probes and found to be positive for H275 and/or Y275. The results obtained were similar to the Sanger sequencing results from the previous study, suggesting that the redesigned probes were efficient in discriminating between wild-type and mutant-type viruses. Furthermore, 133 samples from 2022, making a total of 183 samples (2020-2022), were tested using improved allelic discrimination real-time RT-PCR, and the overall prevalence rate of oseltamivir resistance in 2020-2022 was found to be 0.54%.
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Affiliation(s)
- Gandhapu Harish
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, India
| | - Ujwal Shetty
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, India
| | - Prasad Varamballi
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, India
| | | | - Anitha Jagadesh
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, India
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Babu NN, Jayaram A, Auti AM, Bhandari Y, Shetty U, Arunkumar G. Rickettsia africae and other unclassified Rickettsia species of the spotted fever group in ticks of the Western Ghats, India. Exp Appl Acarol 2023; 90:429-440. [PMID: 37347433 PMCID: PMC10406665 DOI: 10.1007/s10493-023-00814-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Accepted: 06/19/2023] [Indexed: 06/23/2023]
Abstract
The spotted fever group (SFG) of Rickettsia are zoonotic disease-causing pathogens, commonly transmitted by hard ticks to a wide range of hosts, including humans. Rickettsia conorii is the common SFG recognised in India, whereas most of the infections due to other group species go undifferentiated at the species level. Hence, this study was conducted to screen host-seeking ticks in the Western Ghats region, India, for the DNA of SFG Rickettsia. The ticks were collected from Kerala, Goa, and Maharashtra states of India during a survey conducted between November 2017 and January 2018. In total, 288 tick pools were screened for Rickettsia spp. DNA using pan-Rickettsia real-time PCR, and conventional PCR targeting the gltA, OmpA and 17-kDa protein-coding genes. Nucleotide sequences were subjected to phylogenetic analysis using the NCBI BLAST tool to identify submitted sequences with higher homology. Neighbour-joining trees were constructed using the reference sequences of the GenBank database. Overall, Rickettsia spp. DNA was detected in 27.2% (62/228 pools) of host-seeking ticks across the Western Ghats region, with an estimated minimum infection rate of 0.057. Upon phylogenetic analysis, it was identified that the detected sequences were highly similar (> 99% sequence homology) to R. africae, Candidatus R. laoensis and an un-categorised Rickettsia species, and they were widely carried by Haemaphysalis ticks. The current study is the first report of R. africae and Candidatus R. laoensis in ticks in India. Although the pathogenicity of these species is not well documented, they may pose a potential threat to both animal and the human population in this geographical region.
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Affiliation(s)
- N Naren Babu
- Manipal Institute of Virology, Manipal Academy of Higher Education (Institution of Eminence Deemed to be University), Manipal, India.
| | - Anup Jayaram
- Manipal Institute of Virology, Manipal Academy of Higher Education (Institution of Eminence Deemed to be University), Manipal, India
| | - Amogh Milind Auti
- Manipal Institute of Virology, Manipal Academy of Higher Education (Institution of Eminence Deemed to be University), Manipal, India
- Department of Precision Medicine, University of Campania 'Luigi vanvitelli', Naples, Italy
| | - Yuvraj Bhandari
- Manipal Institute of Virology, Manipal Academy of Higher Education (Institution of Eminence Deemed to be University), Manipal, India
| | - Ujwal Shetty
- Manipal Institute of Virology, Manipal Academy of Higher Education (Institution of Eminence Deemed to be University), Manipal, India
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Krishna S, Jayaram A, Shetty U, Varamballi P, Mukhopadhyay C, Jagadesh A. Detection of H275Y oseltamivir resistance gene mutation among Influenza A(H1N1)pdm09 patients by allelic discrimination real-time RT-PCR. J Med Virol 2023; 95:e28764. [PMID: 37212286 DOI: 10.1002/jmv.28764] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 03/23/2023] [Accepted: 04/10/2023] [Indexed: 05/23/2023]
Abstract
Influenza viruses can mutate genetically and cause a range of respiratory ailments. The H275Y mutation in the neuraminidase (NA) gene reduces the effectiveness of oseltamivir, a widely used drug for the treatment of Influenza A and B virus infection. The World Health Organization (WHO) recommends single-nucleotide polymorphism assays to detect this mutation. The present study aims to estimate the prevalence of H275Y mutation conferring oseltamivir resistance in Influenza A(H1N1)pdm09 virus among hospitalized patients from June 2014 to December 2021. Following the WHO protocol, allelic discrimination real-time RT-PCR was performed for 752 samples. Out of the 752 samples, 1 tested positive for Y275 gene mutation by allelic discrimination real-time RT-PCR. In samples of years 2020 and 2021, neither the H275 nor Y275 genotype was detected. Sequencing of the NA gene of all negative samples showed a mismatch between the NA sequence and the probes used in the allelic discrimination assay. Also, Y275 mutation was detected in only 1 sample from 2020. The prevalence of oseltamivir resistance was estimated as 0.27% among the Influenza A(H1N1)pdm09 patients during 2014-2021. The study highlights that the WHO-recommended probes for detecting H275Y mutation may not be useful to detect 2020 and 2021 circulating strains of Influenza A(H1N1)pdm09, emphasizing the need for continuous monitoring of mutations in the influenza virus.
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Affiliation(s)
- Smriti Krishna
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Anup Jayaram
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Ujwal Shetty
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Prasad Varamballi
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Chiranjay Mukhopadhyay
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Anitha Jagadesh
- Manipal Institute of Virology, Manipal Academy of Higher Education, Manipal, Karnataka, India
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Hegde P, Gunishetty V, Shetty V, Shetty U, Abraham S, Bajjuri S. Intraoperative evaluation of the resected bone margin in mandibular cancers using a trephine drill and frozen section analysis. Int J Oral Maxillofac Surg 2023; 52:409-412. [PMID: 35981925 DOI: 10.1016/j.ijom.2022.07.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 10/11/2021] [Revised: 07/23/2022] [Accepted: 07/26/2022] [Indexed: 11/25/2022]
Abstract
The objective of this study was to evaluate the accuracy and feasibility of intraoperative frozen section analysis of samples harvested with a trephine drill from the bone resection margins to identify malignancy. Thirty-five patients who were diagnosed with locally advanced oral squamous cell carcinoma involving the mandible were included in this study. After tumour resection, bone samples were collected from the resection margin of the specimen using a trephine drill. Sampling yielded a cylindrical specimen of bony tissue that included both cortical and cancellous areas. A second sample was obtained from the area where bone invasion was evident; this was used as a positive control. Frozen section analysis was performed intraoperatively to check for malignancy. The sensitivity of this technique was found to be 81.8%, with specificity of 87.5%, a positive predictive value of 75%, negative predictive value of 91.3%, and accuracy of 85.7% when compared to standard histopathology as the gold standard. In conclusion, the evaluation of bone margins using the trephine drill technique and frozen section analysis proved to be fast and reliable.
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Affiliation(s)
- P Hegde
- Department of Oral and Maxillofacial Surgery, A.B. Shetty Memorial Institute of Dental Sciences, Nitte Deemed to be University, Mangaluru, Karnataka, India
| | - V Gunishetty
- Department of Oral and Maxillofacial Surgery, A.B. Shetty Memorial Institute of Dental Sciences, Nitte Deemed to be University, Mangaluru, Karnataka, India.
| | - V Shetty
- Department of Oral and Maxillofacial Surgery, A.B. Shetty Memorial Institute of Dental Sciences, Nitte Deemed to be University, Mangaluru, Karnataka, India
| | - U Shetty
- Department of Oral and Maxillofacial Surgery, A.B. Shetty Memorial Institute of Dental Sciences, Nitte Deemed to be University, Mangaluru, Karnataka, India
| | - S Abraham
- Department of Oral and Maxillofacial Surgery, A.B. Shetty Memorial Institute of Dental Sciences, Nitte Deemed to be University, Mangaluru, Karnataka, India
| | - S Bajjuri
- Kamineni Institute of Dental Sciences, Dr. NTR University of Health Sciences, Vijayawada, Andhra Pradesh, India
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Vikas R, Prabhu SG, Mudgal PP, Shetty U, Karunakaran K, Jagadesh A, Auti A, Stansilaus RP, Nair S, Arunkumar G. HSV susceptibility to acyclovir - genotypic and phenotypic characterization. Antivir Ther 2018; 24:141-145. [PMID: 30507553 DOI: 10.3851/imp3279] [Citation(s) in RCA: 2] [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] [Accepted: 11/14/2018] [Indexed: 10/27/2022]
Abstract
BACKGROUND Infections due to drug-resistant herpes simplex viruses (HSV) represent an important clinical concern, especially in immunocompromised patients. The present study was aimed at detecting acyclovir (ACV) susceptibility in HSV clinical samples. METHODS A total of 13 HSV-positive clinical samples (5 HSV-1 and 8 HSV-2) recovered from patients (1 immunocompromised and 12 of unknown immune status) were included in the study. The genotypic analysis involved an initial UL23 (thymidine kinase) gene sequencing, followed by a confirmatory phenotypic assay using plaque reduction technique. RESULTS Two novel amino acid changes, A37V and H283N, were detected in HSV-1 positive clinical samples, which were found to be susceptible to acyclovir (half maximal effective concentration = 1.5 µM) by plaque reduction assay. CONCLUSIONS These two novel amino acid changes could be therefore considered as natural polymorphisms, a phenomenon widely associated with the HSV-UL23 gene.
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Affiliation(s)
- Raksha Vikas
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Suresha G Prabhu
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Piya P Mudgal
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Ujwal Shetty
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Kavitha Karunakaran
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Anitha Jagadesh
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Amogh Auti
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Rithu P Stansilaus
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Sudheesh Nair
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
| | - Govindakarnavar Arunkumar
- Manipal Centre for Virus Research, Manipal Academy of Higher Education (deemed to be University), Manipal, Karnataka, India
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Sreeramareddy C, Suri S, Menezes RG, Kumar HNH, Rehman M, Islam R, Shah M, Sathian B, Pereira XV, Shetty U, Vaswani VR. SP4-24 Self-reported tobacco smoking practices among medical students and their perceptions towards training about tobacco smoking in medical curricula: a cross-sectional, questionnaire survey in Malaysia, India, Pakistan, Nepal, and Bangladesh. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976p.18] [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: 11/03/2022]
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Chandrasekaran K, Liu LI, Hatanpää K, Shetty U, Mehrabian Z, Murray PD, Fiskum G, Rapoport SI. Chronic exposure of neural cells to elevated intracellular sodium decreases mitochondrial mRNA expression. Mitochondrion 2005; 1:141-50. [PMID: 16120274 DOI: 10.1016/s1567-7249(01)00010-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2000] [Revised: 03/21/2001] [Accepted: 03/29/2001] [Indexed: 12/30/2022]
Abstract
Regulation of expression of mitochondrial DNA- (mtDNA-) encoded genes of oxidative phosphorylation can occur rapidly in neural cells subjected to a variety of physiological and pathological conditions. However, the intracellular signal(s) involved in regulating these processes remain unknown. Using mtDNA-encoded cytochrome oxidase subunit III (COX III), we show that its mRNA expression in a differentiated rat pheochromocytoma cell line PC12S is decreased by chronic exposure to agents that increase intracellular sodium. Treatment of differentiated PC12S cells either with ouabain, an inhibitor of Na/K-ATPase, or with monensin, a sodium ionophore, decreased the steady-state levels of COX III mRNA by 50%, 3-4 h after addition of the drugs. No significant reduction in mtDNA-encoded 12S rRNA or nuclear DNA-encoded beta-actin mRNA were observed. Removal of the drugs restored the normal levels of COX III mRNA. Determination of half-lives of COX III mRNA, 12S rRNA, and beta-actin mRNA revealed a selective decrease in the half-life of COX III mRNA from 3.3 h in control cells to 1.6 h in ouabain-treated cells, and to 1 h in monensin-treated cells. These results suggest the existence of a mechanism of posttranscriptional regulation of mitochondrial gene expression that is independent of the energetic status of the cell and may operate under pathological conditions.
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Affiliation(s)
- K Chandrasekaran
- Department of Anesthesiology, University of Maryland School of Medicine, MSTF 5-34, 685 West Baltimore Street, Baltimore, MD 21201, USA.
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Furey ML, Pietrini P, Alexander GE, Mentis MJ, Szczepanik J, Shetty U, Greig NH, Holloway HW, Schapiro MB, Freo U. Time course of pharmacodynamic and pharmacokinetic effects of physostigmine assessed by functional brain imaging in humans. Pharmacol Biochem Behav 2000; 66:475-81. [PMID: 10899358 DOI: 10.1016/s0091-3057(00)00186-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [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: 10/18/2022]
Abstract
In imaging studies of brain functions using pharmacological probes, identification of the time point at which central effects of intravenously infused drugs become stable is crucial to separate the effects of experimental variables from the concomitant changes in drug effects over time. We evaluated the time courses of the pharmacokinetics and pharmacodynamics, including butyrylcholinesterase inhibition and central neural responses, of physostigmine in healthy young subjects. Ten positron emission tomography (PET) scans that alternated between a rest condition (eyes open, ears unplugged) and a working memory for faces (WM) task were acquired in healthy subjects. Subjects in the drug group received a saline infusion for the first two scans, providing a baseline measure, then received an infusion of physostigmine for all subsequent scans. Subjects in the control group received a placebo infusion of saline for all scans. Physostigmine plasma levels and percent butyrylcholinesterase inhibition increased over time (p < 0. 0001), and both became stable by 40 min. Physostigmine decreased reaction time (RT) (p = 0.0005), and this effect was detected after 20 min of infusion and stable thereafter. Physostigmine also decreased regional cerebral blood flow (rCBF) in right prefrontal cortex during task (p = 0.0002), and this effect was detected after 40 min of infusion and stable thereafter. No change in RT or rCBF was observed in the control group. These results indicate that a 40-min infusion of physostigmine was necessary to obtain stable central effects. More generally, we have demonstrated that experimental effects can vary with time, especially during the initial phases of a drug infusion, indicating that it is critical that these changes are controlled.
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Affiliation(s)
- M L Furey
- Laboratory of Neurosciences, National Institute on Aging, NIH, Bethesda, MD 20892, USA.
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Furey ML, Pietrini P, Haxby JV, Alexander GE, Lee HC, VanMeter J, Grady CL, Shetty U, Rapoport SI, Schapiro MB, Freo U. Cholinergic stimulation alters performance and task-specific regional cerebral blood flow during working memory. Proc Natl Acad Sci U S A 1997; 94:6512-6. [PMID: 9177249 PMCID: PMC21081 DOI: 10.1073/pnas.94.12.6512] [Citation(s) in RCA: 111] [Impact Index Per Article: 4.1] [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] [Indexed: 02/04/2023] Open
Abstract
Modulation of the cholinergic neurotransmitter system results in changes in memory performance, including working memory (WM), in animals and in patients with Alzheimer disease. To identify associated changes in the functional brain response, we studied performance measures and regional cerebral blood flow (rCBF) using positron emission tomography (PET) in healthy subjects during performance of a WM task. Eight control subjects received an infusion of saline throughout the study and 13 experimental subjects received a saline infusion for the first 2 scans followed by a continuous infusion of physostigmine, an acetylcholinesterase inhibitor, for the subsequent 8 scans. rCBF was measured using H215O and PET in a sequence of 10 PET scans that alternated between rest and task scans. During task scans, subjects performed the WM task for faces. Physostigmine both improved WM efficiency, as indicated by faster reaction times, and reduced WM task-related activity in anterior and posterior regions of right midfrontal gyrus, a region shown previously to be associated with WM. Furthermore, the magnitudes of physostigmine-induced change in reaction time and right midfrontal rCBF correlated. These results suggest that enhancement of cholinergic function can improve processing efficiency and thus reduce the effort required to perform a WM task, and that activation of right prefrontal cortex is associated with task effort.
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Affiliation(s)
- M L Furey
- Laboratory of Neurosciences, National Institute on Aging, National Institutes of Health, Bethesda, MD 20892, USA.
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Begeot M, Shetty U, Kilgore M, Waterman M, Simpson E. Regulation of expression of the CYP11A (P450scc) gene in bovine ovarian luteal cells by forskolin and phorbol esters. J Biol Chem 1993; 268:17317-25. [PMID: 8394339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
This study examines the transcriptional regulation of the bovine CYP11A (P450scc) gene by activators of protein kinase A and protein kinase C in bovine ovarian luteal cells. Cells were transfected with reporter gene constructs containing deletion mutations of the 5'-flanking region of the bovine CYP11A gene linked to the minimal beta-globin gene. A construct containing -118/-101 base pairs of CYP11A sequence retains the same degree of stimulation by forskolin and inhibition by co-treatment with phorbol 12-myristate 13-acetate as larger constructs. This sequence contains two putative binding sites for nuclear proteins, an AP1-like sequence and an overlapping GA box element. Gel shift analysis using nuclear extracts of bovine ovarian luteal cells demonstrated that both the wild-type -118/-101-base pair sequence and a consensus GC box bound Sp1 or Sp1-like proteins. Mutation of the GA box element completely suppressed stimulation by forskolin. Absence of binding using the same mutated sequence correlated with the reporter gene transcription results. Mutation of the AP1-like site had little effect on forskolin induction of phorbol 12-myristate 13-acetate inhibition. These results indicate that both stimulation by forskolin and inhibition by phorbol esters are mediated by the same GA box element, which binds Sp1 or an Sp1-like protein.
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Affiliation(s)
- M Begeot
- Cecil H. and Ida Green Center for Reproductive Biology Sciences, University of Texas Southwestern Medical Center, Dallas 75235
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Abstract
The electrocardiographic abnormalities found in 100 patients with acute cerebrovascular disease and previously normal hearts are described. The abnormalities were more often seen in patients with intracerebral and subarachnoid hemorrhages. The most common changes were Q-Tc Prolongation and ST segment and T wave abnormalities. The mechanisms of these electrocardiographic abnormalities appear to be multiple.
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Affiliation(s)
- A Ramani
- Department of Medicine, Kasturba Medical College, Manipal, India
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Mehta H, Shetty U, Parekh JG. Succinic dehydrogenase activity in leukocytes. INDIAN J PATHOL MICR 1976; 19:205-10. [PMID: 1022693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Mehta H, Shetty U, Parekh JG. Leucocyte alkaline phosphatase activity--its utility in diagnosis. Indian J Med Sci 1974; 28:12-8. [PMID: 4824269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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