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Gautam M, Yadav SK, Agarwal P, Sharma D. Low cost smart phone based laryngoscopy for the assessment of vocal cords in patients undergoing thyroid surgery: A pilot study. Trop Doct 2024:494755241246823. [PMID: 38654398 DOI: 10.1177/00494755241246823] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Can a smart phone application be reliably used for laryngoscopy? This thesis was tested for peri-operative evaluation of vocal cords in patients undergoing thyroid and parathyroid surgery.
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Affiliation(s)
- Maithily Gautam
- Junior Resident, Department of Surgery, NSCB Medical College, Jabalpur, MP, India
| | - Sanjay Kumar Yadav
- Assistant Professor, Department of Surgery, NSCB Medical College, Jabalpur, MP, India
| | - Pawan Agarwal
- Professor, Department of Surgery, NSCB Medical College, Jabalpur, (MP) India
| | - Dhananjaya Sharma
- Professor and Head, Department of Surgery, NSCB Medical College, Jabalpur, MP, India
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Affiliation(s)
- M Gautam
- Mayo Clinic, Rochester, Minnesota
| | - A Sharma
- Medical College of Georgia, Augusta, Georgia.
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Lorello GR, Gautam M, Barned C, Peer M. Impact of the intersection of anaesthesia and gender on burnout and mental health, illustrated by the COVID-19 pandemic. Anaesthesia 2021; 76 Suppl 4:24-31. [PMID: 33682104 PMCID: PMC8251311 DOI: 10.1111/anae.15360] [Citation(s) in RCA: 7] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/16/2020] [Indexed: 12/15/2022]
Abstract
Physician burnout and poor mental health are prevalent and often stigmatised. Anaesthetists may be at particular risk and this is further increased for women anaesthetists due to biases and inequities within the specialty. However, gender-related risk factors for and experiences of burnout and poor mental health remain under-researched and under-reported. This negatively impacts individual practitioners, the anaesthesia workforce and patients and carries significant financial implications. We discuss the impact of anaesthesia and gender on burnout and mental health using the COVID-19 pandemic as an example illustrating how women and men differentially experience stressors and burnout. COVID-19 has further accentuated the gendered effects of burnout and poor mental health on anaesthetists and brought further urgency to the need to address these issues. While both personal and organisational factors contribute to burnout and poor mental health, organisational changes that recognise and acknowledge inequities are pivotal to bolster physician mental health.
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Affiliation(s)
- G. R. Lorello
- Department of Anesthesiology and Pain MedicineUniversity of TorontoTorontoONCanada
- Department of Anesthesiology and Pain MedicineUniversity Health NetworkToronto Western HospitalTorontoONCanada
| | - M. Gautam
- Department of PsychiatryUniversity of OttawaOttawaONCanada
| | - C. Barned
- University Health NetworkToronto Western HospitalTorontoONCanada
- Pragmatic Health Ethics Research UnitInstitut de recherches cliniques de MontrealMontrealQCCanada
| | - M. Peer
- Department of Anesthesiology and Pain MedicineUniversity Health NetworkToronto Western HospitalTorontoONCanada
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Gautam M, Shukla K, Sawal N. Impulse-control and related behavioural disorder (ICD-RB) due to maladaptive-use of pramipexole in patients of advanced Parkinson's Disease (PD). Parkinsonism Relat Disord 2020. [DOI: 10.1016/j.parkreldis.2020.06.097] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Adhikari SP, Gautam M. The Effectiveness of Accelerated Skill Acquisition Program for Upper Extremity Motor Training in Bilateral Stroke. Kathmandu Univ Med J (KUMJ) 2019; 17:341-343. [PMID: 33311046] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The bilateral stroke is an added challenge for functional recovery. The evidence of effective therapy intervention for bilateral stroke is rare. A protocol of 30 hours (5 hours/week for 6 weeks) of accelerated skill acquisition program (ASAP) has been administered to a patient with bilateral ischemic middle cerebral artery syndrome at sub-acute stage. Two sessions per day (separately for right and left) were administered. Nepali Wolf Motor Function Test (WMFT) was used to evaluate performance time before and after the treatment. The performance time on Wolf Motor Function Test got largely and consistently reduced on all items of both extremities. There was improvement in grip strength and weight lifting items. Bilateral hand items and turn key in lock were successfully completed after the treatment. Thus, the accelerated skill acquisition program yielded large reduction in performance time, improved hand skills and demonstrated functional improvement of both upper extremities in individual with bilateral stroke.
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Affiliation(s)
- S P Adhikari
- Department of Physiotherapy, Kathmandu University School of Medical Sciences, Dhulikhel, Kavre, Nepal
| | - M Gautam
- Department of Physiotherapy, Nepal Army Hospital, Kathmandu, Nepal
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Singhi L, Sagili KD, Sharath BN, Bhandari K, Dadul PK, Gautam M, Ravichandra C, Chadha S, Satyanarayana S. Non-response to first-line anti-tuberculosis treatment in Sikkim, India: a risk-factor analysis study. Public Health Action 2018; 8:162-168. [PMID: 30775275 DOI: 10.5588/pha.18.0026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 04/23/2018] [Accepted: 09/06/2018] [Indexed: 02/06/2023] Open
Abstract
Setting: Sikkim, India, has the highest proportion of tuberculosis (TB) patients on first-line anti-tuberculosis regimens with the outcome 'failure' or 'shifted to regimen for multidrug-resistant TB (MDR-TB)'. Objective: To assess the factors associated with non-response to treatment, i.e., 'failure' or 'shifted to MDR-TB regimen'. Methods: We conducted a retrospective cohort study using Revised National Tuberculosis Control Programme data of all TB patients registered in 2015 for first-line TB treatment. In addition, we interviewed 42 patients who had not responded to treatment to ascertain their current status. Results: Of 1508 patients enrolled for treatment, about 9% were classified as non-response to treatment. Patient factors associated with non-response were urban setting (adjusted odds ratio [aOR] 2.39, 95%CI 1.22-4.67), ethnicity (being an Indian tribal, aOR 1.73, 95%CI 1.17-2.57, Indian [other] aOR 1.83, 95%CI 1.29-2.60 compared to patients of Nepali origin) and those on retreatment (aOR 2.40, 95%CI 1.99-2.91). Of the patients interviewed, 28 (67%) had received treatment for drug-resistant TB. Conclusion: In Sikkim, one in 11 patients had not responded to first-line anti-tuberculosis treatment. Host-pathogen genetics and socio-behavioural studies may be required to understand the reasons for the differences in non-response, particularly among ethnic groups.
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Affiliation(s)
| | - K D Sagili
- International Union Against Tuberculosis and Lung Disease South-East Asia Office, New Delhi, India
| | - B N Sharath
- ESIC (Employees' State Insurance Act) Medical College and Post Graduate Institute of Medical Science and Research, Bangalore, India
| | | | | | | | | | - S Chadha
- International Union Against Tuberculosis and Lung Disease South-East Asia Office, New Delhi, India
| | - S Satyanarayana
- International Union Against Tuberculosis and Lung Disease South-East Asia Office, New Delhi, India
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Gurung B, Shrestha R, Shrestha S, Singh M, Koirala A, Chataut S, Tuladhar S, Shrestha S, Ghimire B, Shrestha M, Gautam M, Dhakal H. P3.09-09 “Prevalence of Epidermal Growth Factor Receptor Mutation in Non-Small Cell Carcinoma Lungs at a Cancer Center in Nepal”. J Thorac Oncol 2018. [DOI: 10.1016/j.jtho.2018.08.1778] [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: 10/28/2022]
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Ray S, Gautam M, Prasoon P. Postoperative pain in rats and its alleviation with neuropeptide Y. J ANAT SOC INDIA 2018. [DOI: 10.1016/j.jasi.2018.06.032] [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: 11/30/2022]
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Affiliation(s)
- M Gautam
- Institute of Veterinary, Animal and Biomedical Sciences (IVABS), EpiCentre, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand
| | - A Ridler
- International Sheep Research Centre, IVABS, Massey University, Private Bag 11 222, Palmerston North, New Zealand
| | - PR Wilson
- Institute of Veterinary, Animal and Biomedical Sciences (IVABS), EpiCentre, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand
| | - C Heuer
- Institute of Veterinary, Animal and Biomedical Sciences (IVABS), EpiCentre, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand
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Brockbank L, Pinto R, Gautam M. P5 Bloody effusions: do the patient’s clotting results or antithrombotic medications matter? Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.148] [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: 11/04/2022]
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Brockelsby C, Wells A, Deegan P, Kent W, Houghton C, Gautam M. P13 The rationale for setting up a dedicated pleural procedure list: benefits for patients and trusts. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.156] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Gautam M, Bhattacharya I, Devi YS, Arya SP, Majumdar SS. Hormone responsiveness of cultured Sertoli cells obtained from adult rats after their rapid isolation under less harsh conditions. Andrology 2016; 4:509-19. [PMID: 26991307 DOI: 10.1111/andr.12161] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 12/02/2015] [Accepted: 12/20/2015] [Indexed: 01/16/2023]
Abstract
During adulthood, testicular Sertoli cells (Sc) coordinate all stages of germ cell (Gc) development involved in sperm production. However, our understanding about the functions of adult Sc is limited because of the difficulties involved in the process of isolating these cells from the adult testis, mainly because of the presence of large number of advanced Gc which interfere with Sc isolation at this age. Most of our knowledge about Sc function are derived from studies which used pre-pubertal rat Sc (18 ± 2-day old) as it is easy to isolate and culture Sc at this age. To this end, we established a less time consuming and less harsh procedure of isolating Sc from adult (60 days of age) rat testis for facilitating research on Sc-mediated regulation of spermatogenesis during adulthood. The cells were isolated using collagenase digestion at higher temperature, reducing the exposure time of cells to the enzyme. Step-wise digestion with intermittent removal of small clusters of tissue helped in increasing the yield of Sc. Isolated Sc were cultured and treated with FSH and testosterone (T) to evaluate their hormone responsiveness in terms of lactate, E2 , cAMP production. Adult Sc were found to be active and produced high amounts of lactate in a FSH-independent manner. FSH-mediated augmentation of cAMP and E2 production by adult Sc was less as compared with that by pre-pubertal Sc obtained from 18-day-old rats. Androgen-binding ability of adult Sc was significantly higher than pre-pubertal Sc. Although T treatment remarkably augmented expression of Claudin 11, it failed to augment lactate production by adult Sc. This efficient and rapid procedure for isolation and culture of functionally viable adult rat Sertoli cells may pave the way for determining their role in regulation and maintenance of spermatogenesis.
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Affiliation(s)
- M Gautam
- Cellular Endocrinology Laboratory, National Institute of Immunology, New Delhi, India
| | - I Bhattacharya
- Cellular Endocrinology Laboratory, National Institute of Immunology, New Delhi, India
| | - Y S Devi
- Cellular Endocrinology Laboratory, National Institute of Immunology, New Delhi, India
| | - S P Arya
- Cellular Endocrinology Laboratory, National Institute of Immunology, New Delhi, India
| | - S S Majumdar
- Cellular Endocrinology Laboratory, National Institute of Immunology, New Delhi, India
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Gautam M, Bhattarai J. Study on the Soil Corrosivity towards the Buried-Structures in Soil Environment of Tanglaphant-Tribhuvan University Campus-Balkhu Areas of Kirtipur. ACTA ACUST UNITED AC 2014. [DOI: 10.3126/njst.v14i2.10417] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Soil parameters such as moisture, pH, resistivity, oxidation-reduction potential, chloride and sulfate ions were investigated, because these parameters affect the corrosive nature of soils toward the buried-galvanized steels and cast-iron pipelines used to supply drinking water in Tanglaphant-Tribhuvan University Campus-Balkhu areas of Kirtipur. The soil parameters examined in the study areas are found as: moisture (7-48%), pH (7.0-7.9), resistivity (6,300-37,000 ohm.cm), oxidation-reduction potential (307-490 mV vs SHE), chloride (13-92 ppm) and sulfate (62-309 ppm) contents. The results gave an indication of mildly corrosive to non-corrosive nature of soils on the buried galvanized steels and cast-iron pipes used to supply drinking water in the study areas of Kirtipur. DOI: http://dx.doi.org/10.3126/njst.v14i2.10417 Nepal Journal of Science and Technology Vol. 14, No. 2 (2013) 65-72
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Jadhav S, Gautam M, Gairola S. Role of vaccine manufacturers in developing countries towards global healthcare by providing quality vaccines at affordable prices. Clin Microbiol Infect 2014; 20 Suppl 5:37-44. [PMID: 24476201 DOI: 10.1111/1469-0691.12568] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Vaccines represent one of the greatest achievements of science and medicine in the fight against infectious diseases. Vaccination is one of the most cost-effective public health tools to prevent infectious diseases. Significant progress has been made in expanding the coverage of vaccines globally, resulting in the prevention of more than two million deaths annually. In 2010, nearly 200 countries endorsed a shared vision to extend the benefits of vaccines to every person by 2020, known as the Decade of Vaccine Initiative (DoV). Vaccine manufacturers in developing countries, as represented by the Developing Countries Vaccine Manufacturers Network (DCVMN), make a significant contribution to DoV by supplying quality vaccines at affordable prices to the people who need them most. About 70% of the global Expanded Program on Immunization (EPI) vaccine supplies are met by DCVMN. Besides EPI vaccine supplies, DCVMN is also targeting vaccines against rotavirus, Japanese encephalitis, pneumonia, human papillomavirus, meningitis and neglected tropical diseases. This article reviews the roles and contributions of DCVMN in making the vaccines accessible and affordable to all.
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Affiliation(s)
- S Jadhav
- Serum Institute of India Limited, Pune, India
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Connor JL, Griffiths P, Gautam M, Youzguin A. P72 In the Post Ultrasound Era, are Core Medical Trainees Struggling to get Experience in Chest Drain Insertion? Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.222] [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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Affiliation(s)
- S Patil
- Department of Dermatology, Dr. D Y Patil Medical College and Research Centre, Nerul, Navi Mumbai, India
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Koirala E, Chapagain A, Thapa L, Gautam M, Paudel R, Pokhrel BR, Rana PVS. Tired heart and mute brain: handle with care. J Coll Med Sci-Nepal 2012. [DOI: 10.3126/jcmsn.v7i3.6714] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Managing a case of stroke is complex. Presence of variable sized brain infarct and heart failure is even more complex to manage. On top of this, presence of clot in the heart adds to confusion in medical management of stroke patients because of limited scientific evidences. With increasing number of stroke patients and improving diagnostic facility, it is interesting to find thrombus in ventricles of few of these patient, which otherwise were uncommon previously in our set up. We present a 64-year-old man, a case of ischemic stroke caused by left ventricular thrombus secondary to dilated cardiomyopathy and highlight the present recommendation to manage the condition. DOI: http://dx.doi.org/10.3126/jcmsn.v7i3.6714 Journal of College of Medical Sciences-Nepal, 2011, Vol-7, No-3, 68-70
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Gautam M, Darroch J, Davies P. P16 TB Infection in the UK indigenous white elderly population: a retrospective study of interferon gamma release assays (IGRAs). Thorax 2011. [DOI: 10.1136/thoraxjnl-2011-201054c.16] [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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Gautam M, Menon R, Huq S, Pandya S, Greenwood J, Walshaw M. 303 The effect of sunshine on vitamin D levels (25-OHD) in cystic fibrosis (CF) patients – a UK experience. J Cyst Fibros 2011. [DOI: 10.1016/s1569-1993(11)60316-0] [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: 11/30/2022]
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Bendre V, Gautam M, Carr R, Smith J, Malloy A. Characterisation of Nanoparticle Size and Concentration for Toxicological Studies. J Biomed Nanotechnol 2011; 7:195-6. [DOI: 10.1166/jbn.2011.1265] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Gautam M, Haris M, Huq S, Shaw M, Ledson M, Walshaw M. P218 Is there any value in obtaining a tissue diagnosis in suspected lung cancer patients with a performance status 3-4? Thorax 2010. [DOI: 10.1136/thx.2010.151068.19] [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: 11/04/2022]
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Huq S, Gautam M, Haris M, Ashish A, Ledson M, Walshaw M. P230 Inappropriate referrals to the rapid access lung clinic (RALC). Thorax 2010. [DOI: 10.1136/thx.2010.151068.31] [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: 11/04/2022]
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Huq S, Haris M, Gautam M, Davies PDO. P59 Why do we often fail to meet the gold standard for the diagnosis of active tuberculosis? Thorax 2010. [DOI: 10.1136/thx.2010.150979.10] [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: 11/04/2022]
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Gautam M, Mohan K, Giles T, Forrest S, Smyth C, Walshaw M, Sukumaran B. S39 Sub typing of non small cell carcinoma in EBUS-TBNA samples. Thorax 2010. [DOI: 10.1136/thx.2010.150912.39] [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: 11/04/2022]
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Ashish A, Fothergill J, Mowat E, Gautam M, Winstanley C, Walshaw M. P108 Phenotypic changes in Pseudomonas aeruginosa (Psa) populations during exacerbations in adult Cystic Fibrosis patients infected with non-epidemic strains. Thorax 2010. [DOI: 10.1136/thx.2010.150987.9] [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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Maharjan BR, Bhandary S, Risal P, Sedhain A, Shakya PR, Gautam M. Microalbuminuria and macroalbuminuria in type 2 diabetes. J Nepal Health Res Counc 2010; 8:110-115. [PMID: 21876575] [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] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
BACKGROUND Type 2 diabetes is the leading cause of end stage renal disease worldwide. Prevalence of diabetic nephropathy (DN) varies in the different ethnic groups. Nepal is country with great ethnic diversity. This study has been done to find the prevalence of microalbuminuria and macroalbuminuria in the two ethnic groups Jyapu and Brahmin. METHODS In our study we have included two ethnic groups Jyapu and Brahmin type 2 diabetic patients. INCLUSION CRITERIA Age ≥ 30 years, clinically diagnosed type 2 diabetic patients. EXCLUSION CRITERIA Patients with a history of urinary tract infection, hematuria, renal failure, intercaste marriage and women with menstruation at the time of sample collection. RESULTS The overall prevalence of albuminuria was 49.05%. The prevalence of microalbuminuria was 35.89% in Jyapu and 37.73% in Brahmin which was comparable. There was significantly higher prevalence of macroalbuminuria in Jyapu 20.75% and Brahmin 3.77%. Association of dietary habit was seen with microalbuminuria and macroalbuminuria in both ethnic groups. CONCLUSIONS The overall prevalence of albuminuria in type 2 diabetes of our study was high and there was significantly higher macroalbuminuria in Jyapu compared with Brahmin. It, therefore, predicts a higher risk of having kidney disease in Jyapu population.
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Affiliation(s)
- B R Maharjan
- Department of Biochemistry, Patan Academy of Health Sciences, Kathmandu, Nepal.
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Gautam M, Benson CJ, Sluka KA. Increased response of muscle sensory neurons to decreases in pH after muscle inflammation. Neuroscience 2010; 170:893-900. [PMID: 20691768 DOI: 10.1016/j.neuroscience.2010.08.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 07/27/2010] [Accepted: 08/02/2010] [Indexed: 12/28/2022]
Abstract
Acid sensing ion channels (ASIC) are found in sensory neurons, including those that innervate muscle tissue. After peripheral inflammation there is an increase in proton concentration in the inflamed tissue, which likely activates ASICs. Previous studies from our laboratory in an animal model of muscle inflammation show that hyperalgesia does not occur in ASIC3 and ASIC1 knockout mice. Therefore, in the present study we investigated if pH activated currents in sensory neurons innervating muscle are altered after induction of muscle inflammation. Sensory neurons innervating mouse (C57/Bl6) muscle were retrogradely labeled with 1,1-dioctadecyl-3,3,3,3 tetramethylindocarbocyanine perchlorate (DiI). Two weeks after injection of DiI, mice were injected with 3% carrageenan to induce inflammation (n=8; 74 neurons) or pH 7.2 saline (n=5; 40 neurons, control) into the gastrocnemius muscle. 24 h later sensory neurons from L4-L6 dorsal root ganglia (DRG) were isolated and cultured. The following day the DRG neuron cultures were tested for responses to pH by whole-cell patch-clamp technique. Approximately 40% of neurons responded to pH 5 with an inward rapidly desensitizing current consistent with ASIC channels in both groups. The mean pH-evoked current amplitudes were significantly increased in muscle sensory neurons from inflamed mice (pH 5.0, 3602 ± 470 pA) in comparison to the controls (pH 7.4, 1964 ± 370 pA). In addition, the biophysical properties of ASIC-like currents were altered after inflammation. Changes in ASIC channels result in enhanced responsiveness to decreases in pH, and likely contribute to the increased hyperalgesia observed after muscle inflammation.
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Affiliation(s)
- M Gautam
- Graduate Program in Physical Therapy and Rehabilitation Science, 1-242 Medical Education Building, University of Iowa, Iowa City, IA 52242, USA
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Risal P, Maharjan BR, Koju R, Makaju RK, Gautam M. Variation of total serum cholesterol among the patient with thyroid dysfunction. Kathmandu Univ Med J (KUMJ) 2010; 8:265-268. [PMID: 21209550 DOI: 10.3126/kumj.v8i2.3573] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND Thyroid hormone has its effect in the lipid metabolism. Thus, thyroid disorder is usually associated with the dyslipidaemia. Hypercholesterolemia is an established risk factor for the cardiovascular disease (CVD) and therefore in case of overt hypothyroidism which is associated with hypercholesterolemia, CVD is most likely to occur. OBJECTIVES controversies still persist about the hypercholesterolemia and sub clinical hypothyroidism. Hence, we conducted our study to elucidate the relation of thyroid hormone with cholesterol in different thyroid disorder. MATERIAL AND METHOD All patients suspected of thyroid disorder within a period of one year were included in the study and free thyroxine-3 (fT3), free thyroxine-4 fT4, Thyroid Stimulating Hormone (TSH) and total cholesterol (TC) in the serum were estimated. Statistical analysis was carried out by using SPSS. 13. RESULTS Among the 169 cases, 32.5% of the patients were having thyroid disorder. In which 8.3% were of hypothyroid, 7.1% were of sub clinical hypothyroid, 8.3% were of hyperthyroid, 7.7% were of sub clinical hyperthyroid and 1.2% cases were of pan hypothyroid. We observed significant negative correlation between TC & fT3(r = -0.226, p = 0.003), significant negative correlation between total cholesterol & fT4(r = -0.197, p = 0.010) and significant positive correlation between TC & TSH(r = 0.365, p = 0.000). Total cholesterol was significantly raised in hypothyroidism (Mean ±SD 283 ± 53, p = 0.000) in comparison to euthyroid population (mean ±SD, 195 ± 58). But cholesterol was not significantly increased in sub clinical hypothyroidism (mean ±SD, 240 ± 46) CONCLUSION Our results show that total cholesterol level in serum is affected by the blood thyroid hormone level. Therefore, screening for hypercholesterolemia could be useful in patients with hypothyroidism to reduce associated disease.
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Affiliation(s)
- P Risal
- Department of Biochemistry, Kathmandu University School of Medical Sciences, Dhulikhel, Nepal.
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Thomas LM, Lappin S, Gautam M, Newman N, Shah C, Gajra A. Predictors for emergency room visits (ERV) and inpatient hospital stay (IH) utilization in elderly veterans with advanced non-small cell lung cancer (NSCLC). J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.20572] [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: 11/20/2022] Open
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Gautam M, Shen Y, Thirkill T, Douglas G, Barakat A. Flow-activated chloride channels in aortic endothelium: sensitivity and functional implications. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)84220-x] [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: 11/17/2022]
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Chang A, Skole K, Gautam M, Schmutz J, Black M, Thomas R, Horwitz B, Friedenberg FK. The impact of past alcohol use on treatment response rates in patients with chronic hepatitis C. Aliment Pharmacol Ther 2005; 22:701-6. [PMID: 16197490 DOI: 10.1111/j.1365-2036.2005.02631.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [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: 01/12/2023]
Abstract
BACKGROUND Studies have shown that past alcohol consumption reduces response rates in patients with chronic hepatitis C treated with interferon monotherapy. AIM To clarify the importance of alcohol consumption on response rates in patients undergoing treatment with pegylated interferon and ribavirin. METHODS In a single centre, prospective study, median daily alcohol consumption (determined by previously validated method) and quartiles of alcohol consumption were calculated. Univariate and binary logistic regression analyses were performed using treatment response status as the dependent variable. RESULTS Overall, in an intention-to-treat analysis, 34 of 115 patients (30%) responded to treatment. In univariate analysis, black patients, especially those with hepatitis C virus genotype 1, high viral load and low alanine aminotransferase were significantly less likely to respond. Predictors of response by regression analysis included alcohol <30 g/day (OR=3.02, 95% CI: 1.02-8.93; P=0.04), non-genotype 1 status (OR=1.98, 95% CI: 1.03-3.80; P=0.04) and non-black race (OR=2.79, 95% CI: 1.33-5.85; P=0.006). CONCLUSIONS Median daily alcohol use >30 g/day is associated with failure to respond to pegylated interferon and ribavirin for treatment of hepatitis C. Past alcohol use should be evaluated when considering treatment for hepatitis C.
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Affiliation(s)
- A Chang
- Department of Medicine, Temple University Hospital, Philadelphia, PA 19140, USA
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Eckler SA, Kuehn R, Gautam M. Deletion of N-terminal rapsyn domains disrupts clustering and has dominant negative effects on clustering of full-length rapsyn. Neuroscience 2005; 131:661-70. [PMID: 15730871 DOI: 10.1016/j.neuroscience.2004.11.035] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/15/2004] [Indexed: 11/16/2022]
Abstract
The peripheral muscle membrane protein rapsyn is essential for the formation and maintenance of high density acetylcholine receptor aggregates at the neuromuscular synapse. Rapsyn is concentrated at synaptic sites and is colocalized with acetylcholine receptors from the earliest stages of synaptogenesis. Previous studies have shown that recombinant rapsyn expressed in heterologous cells forms clusters, and acetylcholine receptors coexpressed with rapsyn are colocalized with rapsyn clusters. However, the molecular interactions involved in clustering of rapsyn are not well defined. To analyze the process of cluster formation by rapsyn we examined the formation of rapsyn clusters and complexes using mutant constructs specifically deleted for individual domains of rapsyn in the presence and absence of tagged, full-length rapsyn. Specific deletions of the tetratricopeptide repeat (TPR) domains 1 and 3 of rapsyn abrogated not only clustering of mutant rapsyns, but also, in a dominant negative fashion, the clustering of tagged, full-length rapsyn. We also analyzed rapsyn protein complexes isolated from cells transfected with tagged and untagged rapsyn. Our results show that both tagged and untagged rapsyn are present in immunoprecipitates of rapsyn from cotransfected cells, demonstrating that rapsyn molecules interact directly or indirectly to form oligomers. Mutants that were dominant negatives were also present in complexes containing tagged, full-length rapsyn. Together these results indicate that rapsyn forms clusters at the synapse by oligomerization, and suggest models for the mechanistic bases of this oligomerization via interactions mediated by TPRs 1 and 3.
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Affiliation(s)
- S A Eckler
- Department of Pharmacological and Physiological Science, St. Louis University School of Medicine, 1402 South Grand Boulevard, St. Louis, MO 63104, USA
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Gautam M, Diwanay SS, Gairola S, Shinde YS, Jadhav SS, Patwardhan BK. Immune response modulation to DPT vaccine by aqueous extract of Withania somnifera in experimental system. Int Immunopharmacol 2004; 4:841-9. [PMID: 15135324 DOI: 10.1016/j.intimp.2004.03.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2003] [Revised: 01/30/2004] [Accepted: 03/08/2004] [Indexed: 11/20/2022]
Abstract
Immunopotentiation on oral feeding of standardized aqueous extract of Withania somnifera (Linn. Dunal, Family Solanaceae) was evaluated in laboratory animals immunized with DPT (Diphtheria, Pertussis, Tetanus) vaccine. The immunostimulation was evaluated using serological and hematological parameters. Treatment of immunized animals with test material (100 mg/kg/day) for 15 days resulted in significant increase of antibody titers to B. pertussis (P=0.000007). Immunized animals (treated and untreated) were challenged with B. pertussis 18,323 strain and the animals were observed for 14 days. Results indicate that the treated animals did show significant increase in antibody titers as compared to untreated animals after challenge (P=0.000003). Immunoprotection against intracerebral challenge of live B. pertussis cells was evaluated based on degree of sickness, paralysis and subsequent death. Reduced mortality accompanied with overall improved health status was observed in treated animals after intracerebral challenge of B. pertussis indicating development of protective immune response. Present study indicates application of the test material as potential immunopotentiating agent possible applications in immunochemical industry. The test material also offers direct therapeutic benefits resulting in reduced morbidity and mortality of experimental animals.
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Affiliation(s)
- M Gautam
- Bioprospecting Laboratory, Interdisciplinary School of Health Sciences, University of Pune, Pune 411007, Maharastra, India.
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Affiliation(s)
- M Gautam
- Faculty Wellness Program, University of Ottawa, Faculty of Medicine, 11 Holland Ave, Ste 512, Ottawa, ON, Canada K1G 5K1.
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Abstract
Iron supplementation is required for optimal response to erythropoietin (EPO) in hemodialysis patients. This is due to blood lost in the dialysis tubing after dialysis and the increased demand for iron by EPO therapy. Maintenance intravenous (IV) iron was administered according to a standardized protocol to pediatric patients on hemodialysis in our institution. The effect of this protocol on EPO dose, iron indices, anemia, and medication costs was evaluated. Data on two groups of patients were retrieved from the health records. Group 1 (n=14) consisted of patients treated in the 18 months prior to the protocol. These patients received oral iron supplements and occasional IV iron. Group 2 (n=5) consisted of all patients treated with the IV iron protocol. There was no difference in clinical characteristics and mean values for monthly hemoglobin, serum iron, ferritin, and transferrin saturation between groups. The dose of EPO was significantly reduced in group 2 compared with group 1 (193.9 +/- 121.4 vs. 73.9 +/- 39.0 units/kg per week, P<0.05). Medication costs were reduced by 26% in group 2. No significant adverse events were seen. Maintenance IV iron reduced the dose of EPO required to maintain blood hemoglobin levels. Our results also suggest that maintenance IV iron is a more-economic method of iron supplementation for pediatric hemodialysis patients.
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Affiliation(s)
- H E Morgan
- Department of Pediatrics, Hospital for Sick Children, Toronto, Canada
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39
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Prucz JC, Clark NN, Gautam M, Lyons DW. Exhaust emissions from engines of the Detroit Diesel Corporation in transit buses: a decade of trends. Environ Sci Technol 2001; 35:1755-1764. [PMID: 11355189 DOI: 10.1021/es001416f] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In the U.S.A., exhaust emissions from city buses fueled by diesel are not characterized well because current emission standards require engine tests rather than tests of whole vehicles. Two transportable chassis dynamometer laboratories developed and operated by West Virginia University (WVU) have been used extensively to gather realistic emission data from heavy-duty vehicles, including buses, tested in simulated driving conditions. A subset of these data has been utilized for a comprehensive introspection into the trends of regulated emissions from transit buses over the last 7 years, which has been prompted by continuously tightening restrictions on one hand, along with remarkable technological progress, on the other hand. Two widely used models of diesel engines manufactured by the Detroit Diesel Corporation (DDC) have been selected as a case-study for such an overview, based on full-scale, on-site testing of actual city buses, driven in accordance with the SAE J1376 standard of a Commercial Business District (CBD) cycle. The results provide solid, quantitative evidence that most regulated emissions from engines produced by DDC have declined over the years, especially with the transition from the 6V-92TA to the Series 50 models. This improvement is remarkable mainly for the emissions of particulate matter (PM), that are lower by over 70%, on average, for the Series 50 engines, though the emissions of nitrogen oxides (NOx) exhibit a reversed trend, showing a degradation of about 6%, on average, with the transition from 6V-92TA to the Series 50 engines. The expected trend of decreasing emission levels with the model year of the engine is clear and consistent for particulate matter (PM), hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx), starting with the 1990 models, although it is not conclusive for carbon dioxide (CO2) emissions.
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Affiliation(s)
- J C Prucz
- Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, West Virginia 26506-6106, USA.
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40
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Affiliation(s)
- M Gautam
- Faculty Wellness Program University of Ottawa Faculty of Medicine Ottawa, Ontario, Canada
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Gautam M, Tewari A, Singh S, Dixit C, Raghu KG, Prakash P, Tripathi O. Frequency- and time-dependent effects of fendiline on action potentials of guinea pig papillary muscle. Jpn J Pharmacol 2000; 83:175-81. [PMID: 10952065 DOI: 10.1254/jjp.83.175] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
The action of fendiline on cardiac electrical activity was investigated in guinea pig papillary muscle by monitoring frequency- and time-dependent changes in membrane potential, action potential (AP) configuration and conduction velocity. Isolated guinea pig papillary muscles driven at 0.1 to 3 Hz showed a concentration-dependent reduction of +Vmax, overshoot, and AP duration at -20mV (APD20) in the presence of fendiline (1-320 microM), reflecting inhibition of Na+ and L-type Ca2+ channels, respectively. No significant change in resting potential and AP duration at 90% repolarization (APD90) were observed. Inhibition of +Vmax and APD20 was more prominent at higher frequency of stimulation (2 Hz) than at lower ones (0.2 Hz), demonstrating frequency-dependent block of Na+ and Ca2+ channels including an open channel block. A good relationship between changes in +Vmax and APD20 suggested some commonality in the mechanism of inhibition of Na+ and Ca2+ channels by fendiline. Time-dependence of effects of fendiline, observed in presence of bolus dose (200 microM), showed an earlier onset of inhibition of +Vmax and APD20, particularly at higher frequencies. Missed beats and conduction block also appeared earlier in preparations driven at higher frequency. These findings suggest a frequency-dependent (and open channel) block of Na+ and Ca2+ channels by fendiline, leading to inhibition of fast and slow conduction in addition to its reported inactivated Ca2+ channel block.
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Affiliation(s)
- M Gautam
- Physiology Division, Central Drug Research Institute, Chhattar Manzil Palace, Lucknow, India
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Fuhrer C, Gautam M, Sugiyama JE, Hall ZW. Roles of rapsyn and agrin in interaction of postsynaptic proteins with acetylcholine receptors. J Neurosci 1999; 19:6405-16. [PMID: 10414969 PMCID: PMC6782834] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023] Open
Abstract
At the neuromuscular junction, aggregates of acetylcholine receptors (AChRs) are anchored in the muscle membrane by association with rapsyn and other postsynaptic proteins. We have investigated the interactions between the AChR and these proteins in cultured C2 myotubes before and after treatment with agrin, a nerve-derived protein that induces AChRs to cluster. When AChRs were isolated from detergent extracts of untreated C2 myotubes, they were associated with rapsyn and, to a lesser degree, with utrophin, beta-dystroglycan, MuSK, and src-related kinases, but not with syntrophin. Treatment with agrin increased the association of AChRs with MuSK, a receptor tyrosine kinase that forms part of the agrin receptor complex, without affecting other interactions. Analysis of rapsyn-deficient myotubes, which do not form protein clusters in response to agrin, revealed that rapsyn is required for association of the AChR with utrophin and beta-dystroglycan, and for the agrin-induced increase in association with MuSK, but not for constitutive interactions with MuSK and src-related kinases. In rapsyn -/- myotubes, agrin caused normal tyrosine phosphorylation of AChR-associated and total MuSK, whereas phosphorylation of the AChR beta subunit, both constitutive and agrin-induced, was strongly reduced. These results show first that aneural myotubes contain preassembled AChR protein complexes that may function in the assembly of the postsynaptic apparatus, and second that rapsyn, in addition to its role in AChR phosphorylation, mediates selected protein interactions with the AChR and serves as a link between the AChR and the dystrophin/utrophin glycoprotein complex.
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Affiliation(s)
- C Fuhrer
- Section on Synaptic Mechanisms, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland 20892, USA
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Abstract
Differentiation of the postsynaptic membrane at the neuromuscular junction requires agrin, a nerve-derived signal; MuSK, a critical component of the agrin receptor in muscle; and rapsyn, a protein that interacts with acetylcholine receptors (AChRs). We showed previously that nerve-induced AChR aggregation is dramatically impaired in knockout mice lacking agrin, MuSK, or rapsyn. However, the phenotypes of these mutants differed in several respects, suggesting that the pathway from agrin to MuSK to rapsyn is complex. Here, we compared the effects of these mutations on two aspects of synaptic differentiation: AChR clustering and transcriptional specialization of synapse-associated myonuclei. First, we show that a plant lectin, VVA-B4, previously shown to act downstream of agrin, can induce AChR clusters on MuSK-deficient but not rapsyn-deficient myotubes in culture. Thus, although both MuSK and rapsyn are required for AChR clustering in vivo, only rapsyn is essential for cluster formation per se. Second, we show that neuregulin, a nerve-derived inducer of AChR gene expression, activates AChR gene expression in cultured agrin- and MuSK-deficient myotubes, even though synapse-specific transcriptional specialization is disrupted in agrin and MuSK mutants in vivo. We propose that agrin works through MuSK to determine a synaptogenic region within which synaptic differentiation occurs.
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MESH Headings
- Agrin/deficiency
- Agrin/genetics
- Agrin/physiology
- Animals
- Cells, Cultured
- Crosses, Genetic
- Heterozygote
- Mice
- Mice, Inbred C57BL
- Mice, Inbred CBA
- Mice, Inbred Strains
- Mice, Knockout
- Mice, Transgenic
- Muscle Fibers, Skeletal/cytology
- Muscle Fibers, Skeletal/physiology
- Muscle Proteins/deficiency
- Muscle Proteins/genetics
- Muscle Proteins/physiology
- Muscle, Skeletal/cytology
- Muscle, Skeletal/physiology
- Mutagenesis
- Phenotype
- Receptors, Cholinergic/genetics
- Receptors, Cholinergic/physiology
- Receptors, Growth Factor/deficiency
- Receptors, Growth Factor/genetics
- Receptors, Growth Factor/physiology
- Receptors, Nicotinic/deficiency
- Receptors, Nicotinic/genetics
- Receptors, Nicotinic/physiology
- beta-Galactosidase/genetics
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Affiliation(s)
- M Gautam
- Department of Molecular Biology and Pharmacology, Washington University School of Medicine, 660 S. Euclid Avenue, St. Louis, MO 63110, USA.
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Abstract
OBJECTIVE To review the literature and describe the incidence and nature of psychotropic drug-related alopecia to assist clinicians in their therapeutic decisions when this adverse event occurs. DATA SOURCES A MEDLINE search (December 1966-March 1998), using each drug name and the keywords alopecia or hair loss, was conducted. A database from the Clarke Institute of Psychiatry in Toronto was also searched. Additional English-language articles were identified through the bibliography of the reviewed literature. Certain pharmaceutical companies were also consulted. STUDY SELECTION All published case reports and review articles were considered for study evaluation. DATA EXTRACTION When possible, details regarding psychotropic drug therapy, development of alopecia, and clinical outcomes were collected for each case. DATA SYNTHESIS Hair loss from the scalp, eyebrows, and pubic area was identified as a possible, yet uncommon, adverse effect of most psychotropic medications. There are few effective management options for alopecia; however, resolution was achieved on discontinuation of the offending drug in almost all of the cases reported. Alopecia was perceived to be an undesirable effect by most patients, often resulting in poor compliance and hence therapeutic failures. CONCLUSIONS Due to the self-limiting nature of mild to moderate hair loss with psychotropic medications, clinicians should consider continuing therapy if there is a good clinical response and the patient agrees with this decision. If severe alopecia occurs, it is recommended to discontinue the medication and pursue therapy with another agent. This is to ensure positive therapeutic outcomes and improved patient compliance.
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Affiliation(s)
- M Gautam
- The Clarke Institute of Psychiatry, University of Toronto, Ontario, Canada.
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Wang ZZ, Mathias A, Gautam M, Hall ZW. Metabolic stabilization of muscle nicotinic acetylcholine receptor by rapsyn. J Neurosci 1999; 19:1998-2007. [PMID: 10066253 PMCID: PMC6782578] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023] Open
Abstract
Although the metabolic half-life of muscle endplate acetylcholine receptor (AChR) changes during development and after denervation in the adult, little is known about the molecular mechanisms that influence receptor stability. We have investigated the effect on AChR turnover of its interaction with rapsyn, a 43 kDa peripheral membrane protein that is closely associated with the AChR in muscle cells and is required for its clustering at endplates. Both in transfected COS cells and in cultured myotubes from rapsyn-negative and rapsyn-positive mice, we have found that the presence of rapsyn slows the turnover of AChRs by as much as twofold. The effect was similar for both embryonic (alpha2betadeltagamma) and adult (alpha2betadeltaepsilon) AChRs and for AChRs whose beta subunit lacked a putative tyrosine phosphorylation site. Neither colchicine nor cytochalasin D altered AChR turnover or prevented the rapsyn effect. Mutant rapsyn proteins whose N-terminal myristoylation signal was eliminated, or whose C terminus or zinc-finger domains were deleted, failed to change the rate of receptor turnover. Each of these mutations affects the association of the AChR with rapsyn, suggesting that AChR stability is altered by interaction between the two proteins. Our results suggest that, in addition to its role in AChR clustering, rapsyn also functions to metabolically stabilize the AChR.
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Affiliation(s)
- Z Z Wang
- Laboratory of Cell Biology, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland 20892, USA
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46
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Gautam M, Por CP, Evans MF. Omeprazole or misoprostol. Which works best for NSAID-induced ulcers? Can Fam Physician 1998; 44:1629-31. [PMID: 9721418 PMCID: PMC2277746] [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: 02/08/2023]
Affiliation(s)
- M Gautam
- Toronto Hospital Family and Community Medicine
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Sanes JR, Apel ED, Burgess RW, Emerson RB, Feng G, Gautam M, Glass D, Grady RM, Krejci E, Lichtman JW, Lu JT, Massoulié J, Miner JH, Moscoso LM, Nguyen Q, Nichol M, Noakes PG, Patton BL, Son YJ, Yancopoulos GD, Zhou H. Development of the neuromuscular junction: genetic analysis in mice. J Physiol Paris 1998; 92:167-72. [PMID: 9789802 DOI: 10.1016/s0928-4257(98)80004-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Formation of the skeletal neuromuscular junction is a multi-step process that requires communication between the nerve and muscle. Studies in many laboratories have led to identification of factors that seem likely to mediate these interactions. 'Knock-out' mice have now been generated with mutations in several genes that encode candidate transsynaptic messengers and components of their effector mechanisms. Using these mice, it is possible to test hypotheses about the control of synaptogenesis. Here, we review our studies on neuromuscular development in mutant mice lacking agrin alpha CGRP, rapsyn, MuSK, dystrophin, dystrobrevin, utrophin, laminin alpha 5, laminin beta 2, collagen alpha 3 (IV), the acetylcholine receptor epsilon subunit, the collagenous tail of acetylcholinesterase, fibroblast growth factor-5, the neural cell adhesion molecule, and tenascin-C.
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Affiliation(s)
- J R Sanes
- Department of Anatomy, Washington University School of Medicine, St. Louis, MO 63110, USA
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Affiliation(s)
- J R Sanes
- Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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50
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Anderson K, Catterson A, Gaudet M, Gautam M, Kerr PJ, Pecher M, Waiser D, Kaji J, Fava M. A cross-sectional study of private psychiatric practices under a single-payer health care system. Can J Psychiatry 1997; 42:395-401. [PMID: 9161764 DOI: 10.1177/070674379704200406] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVES To examine current concerns that in the Canadian single-payer mental health care system, the "rich worried well" (that is, wealthy individuals who are worried yet mentally well) may overuse psychiatric services, while low-income, uninsured mentally ill individuals may remain undertreated. The current study focuses on the mental health care in the Canadian region of Ottawa-Carleton, where a single-payer system provides universal access to mental health services, to assess how psychiatric services are provided by psychiatrists in private practice. METHOD One hundred and seven private psychiatrists working in the region of Ottawa-Carleton completed a questionnaire which contained questions about the sociodemographic characteristics and background of the psychiatrists themselves and which asked the psychiatrists specific questions about the sociodemographic status, diagnosis, and treatment of each patient seen on November 10, 1994. RESULTS Approximately 93% of the patients seen met criteria for one or more Axis I disorders, of which mood and anxiety disorders were the most common. Wealthier patients were relatively underrepresented among the patients treated by the private psychiatrists. In addition, we found no significant differences in the distribution of Axis I, Axis II, and Axis III disorders between patients earning below $30,000 per year compared with patients earning above $60,000 per year. CONCLUSIONS Our results suggest that outpatient psychiatric care delivered by private psychiatrists in a Canadian single-payer system targets primarily individuals with major psychiatric disorders and does not seem to favour "the worried well." Larger epidemiological studies with independent assessments of psychiatric populations are necessary to confirm our findings.
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