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Sanabria A, Pinillos P, Chiesa-Estomba C, Guntinas-Lichius O, Kowalski LP, Mäkitie AA, Rao KN, Ferlito A. Comparing Mohs micrographic surgery and wide local excision in the management of head and neck dermatofibrosarcoma protuberans: a scoping review. J DERMATOL TREAT 2024; 35:2295816. [PMID: 38146660 DOI: 10.1080/09546634.2023.2295816] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 12/11/2023] [Indexed: 12/27/2023]
Abstract
Dermatofibrosarcoma protuberans (DFSP) is a rare, locally aggressive cutaneous sarcoma with a propensity for recurrence. Its management, particularly in the head and neck (H&N) region, presents unique challenges. This study aimed to evaluate the effectiveness of Mohs micrographic surgery (MMS) compared to wide local excision (WLE) in treating H&N DFSP and its impact on recurrence rates and tissue preservation. A comprehensive search was conducted in PubMed/MEDLINE, yielding 29 relevant studies. We included studies comparing MMS and WLE in adult patients with H&N DFSP and reporting local recurrence outcomes. Data were analyzed using random effects analysis, with a meta-analysis performed for comparative studies. Analysis of studies demonstrated a lower recurrence for MMS. Comparative analysis of five studies involving 117 patients showed a significantly lower recurrence rate in the MMS group (2%) compared to the WLE group (19%). Margin status varied between studies, with some achieving negative margins at shorter distances. In the management of H&N DFSP, MMS has emerged as a superior surgical technique, consistently associated with reduced recurrence rates and the potential for tissue preservation. The adoption of MMS should be considered for its capacity to achieve negative margins with fewer processing steps, particularly in anatomically complex regions like the H&N.
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Affiliation(s)
- Alvaro Sanabria
- Department of Surgery, School of Medicine, Universidad de Antioquia, Medellin, Colombia
- CEXCA Centro de Excelencia en Enfermedades de Cabeza y Cuello, Medellin, Colombia
| | - Pilar Pinillos
- Department of Surgery, School of Medicine, Universidad de Antioquia, Medellin, Colombia
| | - Carlos Chiesa-Estomba
- Department of Otorhinolaryngology-Head & Neck Surgery, Hospital Universitario Donostia-Biodonostia Research Institute, San Sebastian, Spain
| | | | - Luiz P Kowalski
- Head and Neck Surgery and Otorhinolaryngology Department, A C Camargo Cancer Center, Sao Paulo, Brazil
- Head and Neck Surgery Department, University of Sao Paulo Medical School, Sao Paulo, Brazil
| | - Antti A Mäkitie
- Department of Otorhinolaryngology-Head and Neck Surgery, Faculty of Medicine, Helsinki University Hospital, University of Helsinki, Helsinki, Finland
- Research Program in Systems Oncology, University of Helsinki, Helsinki, Finland
| | - Karthik N Rao
- Department of Head Neck Surgical Oncology, All India Institute of Medical Sciences, Raipur, India
| | - Alfio Ferlito
- Coordinator of the International Head and Neck Scientific Group, Padua, Italy
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Asarkar AA, Chang BA, de Bree R, Kowalski LP, Guntinas-Lichius O, Bradley PJ, de Graaf P, Strojan P, Rao KN, Mäkitie AA, López F, Rinaldo A, Palme C, Genden EM, Sanabria A, Rodrigo JP, Ferlito A. Primary Management of Operable Locally Advanced Oral Cavity Squamous Cell Carcinoma: Current Concepts and Strategies. Adv Ther 2024:10.1007/s12325-024-02861-6. [PMID: 38642199 DOI: 10.1007/s12325-024-02861-6] [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] [Received: 02/28/2024] [Accepted: 03/25/2024] [Indexed: 04/22/2024]
Abstract
INTRODUCTION Locally advanced oral cavity carcinoma (LAOCSCC) is primarily treated with surgery followed by radiotherapy with or without chemotherapy. METHODS A review of literature using PubMED was performed for studies reporting the management of LAOCSCC. Based on the reviewed literature and opinions of experts in the field, recommendations were made. RESULTS Studies have shown that outcomes following resection of T4a and infranotch (inferior to mandibular notch) T4b are comparable. We discuss the concept of compartmental resection of LAOCSCC and issues concerning the management of the neck. Further, patients who refuse or are unable to undergo surgery can be treated with chemoradiotherapy with uncertain outcomes. The role of neoadjuvant chemotherapy has shown promise for organ (mandibular) preservation in a select subset of patients. CONCLUSION The management strategy for LAOCSCC should be determined in a multidisciplinary setting with emphasis on tumor control, functional preservation, and quality of life of the patient.
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Affiliation(s)
- Ameya A Asarkar
- Department of Otolaryngology/Head and Neck Surgery, Louisiana Health Sciences Center, Shreveport, LA, 71103, USA.
| | - Brent A Chang
- Department of Otolaryngology/Head and Neck Surgery, Mayo Clinic Arizona, Phoenix, AZ, USA
| | - Remco de Bree
- Department of Head and Neck Surgical Oncology, UMC Utrecht Cancer Center, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Luiz P Kowalski
- Head and Neck Surgery Department, University of Sao Paulo Medical School, Sao Paulo, Brazil
- Department of Head and Neck Surgery and Otorhinolaryngology, A C Camargo Cancer Center, São Paulo, Brazil
| | - Orlando Guntinas-Lichius
- Department of Otorhinolaryngology, Institute of Phoniatry/Pedaudiology, Jena University Hospital, Jena, Germany
| | - Patrick J Bradley
- Department of ORLHNS, Queens Medical Centre Campus, Nottingham University Hospitals, Derby Road, Nottingham, NG7 2UH, UK
| | - Pim de Graaf
- Amsterdam UMC Location Vrije Universiteit, Radiology and Nuclear Medicine, de Boelelaan 1117, Amsterdam, The Netherlands
- Cancer Center Amsterdam, Imaging and Biomarkers, Amsterdam, The Netherlands
| | - Primož Strojan
- Department of Radiation Oncology, Institute of Oncology, 1000, Ljubljana, Slovenia
| | - Karthik N Rao
- Department of Head and Neck Oncology, Sri Shankara Cancer Hospital and Research Center, Bangalore, India
| | - Antti A Mäkitie
- Department of Otorhinolaryngology, Head and Neck Surgery, Research Program in Systems Oncology, Faculty of Medicine, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Fernando López
- ENT and Head and Neck Department, Hospital Universitario Central de Asturias, Oviedo, Spain
| | | | - Carsten Palme
- Sydney Head and Neck Cancer Institute, Chris O'Brien Lifehouse, Sydney, NSW, Australia
- Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
| | - Eric M Genden
- Department of Otolaryngology-Head and Neck Surgery, Mount Sinai Medical Center, New York, NY, 10029, USA
| | - Alvaro Sanabria
- Department of Surgery, School of Medicine, Centro de Excelencia en Cirugia de Cabeza y Cuello-CEXCA, Universidad de Antioquia, Medellin, Colombia
| | - Juan P Rodrigo
- Department of Otolaryngology, Hospital Universitario Central de Asturias, IUOPA, University of Oviedo, CIBERONC, 33011, Oviedo, Spain
| | - Alfio Ferlito
- Coordinator of the International Head and Neck Scientific Group, 35030, Padua, Italy
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Rao KN, Rajguru R, Dange P, Vetter D, Triponez F, Nixon IJ, Randolph GW, Mäkitie AA, Zafereo M, Ferlito A. Lower Rates of Hypocalcemia Following Near-Infrared Autofluorescence Use in Thyroidectomy: A Meta-Analysis of RCTs. Diagnostics (Basel) 2024; 14:505. [PMID: 38472977 DOI: 10.3390/diagnostics14050505] [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] [Received: 12/20/2023] [Revised: 01/18/2024] [Accepted: 02/22/2024] [Indexed: 03/14/2024] Open
Abstract
BACKGROUND Iatrogenic injury of the parathyroid glands is the most frequent complication after total thyroidectomy. OBJECTIVE To determine the effectiveness of near-infrared autofluorescence (NIRAF) in reducing postoperative hypocalcemia following total thyroidectomy. METHODS PubMed, Scopus, and Google Scholar databases were searched. Randomised trials reporting at least one hypocalcemia outcome following total thyroidectomy using NIRAF were included. RESULTS The qualitative data synthesis comprised 1363 patients from nine randomised studies, NIRAF arm = 636 cases and non-NIRAF arm = 637 cases. There was a statistically significant difference in the overall rate of hypocalcemia log(OR) = -0.7 [(-1.01, -0.40), M-H, REM, CI = 95%] and temporary hypocalcemia log(OR) = -0.8 [(-1.01, -0.59), M-H, REM, CI = 95%] favouring the NIRAF. The difference in the rate of permanent hypocalcemia log(OR) = -1.09 [(-2.34, 0.17), M-H, REM, CI = 95%] between the two arms was lower in the NIRAF arm but was not statistically significant. CONCLUSIONS NIRAF during total thyroidectomy helps in reducing postoperative hypocalcemia. Level of evidence-1.
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Affiliation(s)
- Karthik N Rao
- Department of Head and Neck Oncology, All India Institute of Medical Sciences, Raipur 492099, India
- Sri Shankara Cancer Hospital and Research Center, Bangalore 560004, India
| | - Renu Rajguru
- Department of Otorhinolaryngology and Head Neck Surgery, All India Institute of Medical Sciences, Raipur 492099, India
| | - Prajwal Dange
- Department of Head and Neck Oncology, All India Institute of Medical Sciences, Raipur 492099, India
| | - Diana Vetter
- Department of Visceral and Transplant Surgery, University Hospital Zurich, 8032 Zurich, Switzerland
| | - Frederic Triponez
- Department of Thoracic and Endocrine Surgery, University Hospitals of Geneva, 1205 Geneva, Switzerland
| | - Iain J Nixon
- Department of Surgery and Otolaryngology, Head and Neck Surgery, Edinburgh University, Edinburgh EH3 9YL, UK
| | - Gregory W Randolph
- Division of Thyroid and Parathyroid Endocrine Surgery, Department of Otolaryngology-Head and Neck Surgery, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA 02114, USA
- Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Antti A Mäkitie
- Department of Otorhinolaryngology, Head and Neck Surgery, Research Program in Systems Oncology, Faculty of Medicine, University of Helsinki, Helsinki University Hospital, 00014 Helsinki, Finland
| | - Mark Zafereo
- Department of Head & Neck Surgery, MD Anderson Cancer Center, Houston, TX 77005, USA
| | - Alfio Ferlito
- Coordinator of the International Head and Neck Scientific Group, 35100 Padua, Italy
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Rao KN, Gangiti KK. Transoral Robotic Surgery. Indian J Surg Oncol 2021; 12:847-853. [PMID: 35110913 PMCID: PMC8764010 DOI: 10.1007/s13193-021-01443-0] [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] [Received: 12/19/2020] [Accepted: 09/01/2021] [Indexed: 11/21/2022] Open
Abstract
Transoral robotic surgery (TORS) became a valuable new head and neck surgery approach from the past decade since its approval. TORS was initially conceived for oropharyngeal squamous cell carcinoma (OPSCC); now, the indications are gradually extrapolated into other subsites. There have been numerous studies comparing the outcomes following surgical and non-surgical treatment, especially for oropharyngeal cancers. TORS for laryngeal cancers is in its infancy, and only a few reports are describing it. Many report suggestive of better functional outcomes following TORS, but level 1 evidence is still lacking. With the further development of novel, flexible, miniaturized robots, it is highly likely to expand TORS indications further. This article provides an overview of TORS in head and neck cancers.
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Affiliation(s)
- Karthik N. Rao
- Department of Head Neck Surgical Oncology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - Kranthi Kumar Gangiti
- Department of Head Neck Surgical Oncology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
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D B, Y KR, V V, Rao KN. Studies on production of low calorie lassi. IJDS 2020. [DOI: 10.33785/ijds.2020.v73i05.015] [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: 11/23/2022]
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Rao KN, Jagade M, Kale VD, Rengaraja D, Hekare A. Margin Status and Duration of Surgery in Resection of Tongue Carcinoma with Ultrasound Coagulation Device: a Comparative Study. Indian J Surg Oncol 2018; 9:501-504. [PMID: 30538379 DOI: 10.1007/s13193-018-0785-z] [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] [Received: 07/27/2017] [Accepted: 07/13/2018] [Indexed: 10/28/2022] Open
Abstract
Tongue is one of the most common subsites involved by oral cancer. Improved surgical care and adjuvant therapy, along with better rehabilitation has significantly improved long-term survival and quality of life in patients with oral cancer. Primary surgical treatment is the preferred modality of treatment in cancers of the oral tongue. Although the surgical techniques have remained unchanged, various devices have been used to aid primary tumour resection, with a view to reduce bleeding and scarring. The purpose of this study is to compare resection of oral tongue tumours using ultrasonic coagulation device with conventional electrodiathermy. This study was conducted to compare histological margins and duration of surgery between ultrasonic coagulation device and electrodiathermy in the resection of oral tongue tumours. A retrospective analysis was performed comprising patients undergoing wide excision for squamous cell carcinoma of the lateral tongue, with either ultrasonic coagulation device or conventional electrodiathermy at Our Institute in Mumbai, India, from October 2015 to December 2016. Single factor ANOVA with the level of significance set at 95% and alpha value of 0.05. Patients who underwent excision with ultrasonic coagulation device better histologically tumour-free margins (except posterior margin) (p values-anterior margin, posterior margin, lateral margin and deep margin 0.0045, 0.59, 0.011 and 0.00013 respectively) and lesser operative time when compared with conventional electrodiathermy. Ultrasonic coagulation device was effective in providing adequate oncologically safe margins in carcinoma tongue.
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Affiliation(s)
- Karthik N Rao
- Department of Otolaryngology and Head Neck Surgery, Grant Medical College and Sir JJ Group of Hospitals, Mumbai, India
| | - Mohan Jagade
- Department of Otolaryngology and Head Neck Surgery, Grant Medical College and Sir JJ Group of Hospitals, Mumbai, India
| | - Vitthal D Kale
- Department of Otolaryngology and Head Neck Surgery, Grant Medical College and Sir JJ Group of Hospitals, Mumbai, India
| | - Devkumar Rengaraja
- Department of Otolaryngology and Head Neck Surgery, Grant Medical College and Sir JJ Group of Hospitals, Mumbai, India
| | - Amol Hekare
- Department of Otolaryngology and Head Neck Surgery, Grant Medical College and Sir JJ Group of Hospitals, Mumbai, India
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Chavan SS, Kale VD, Rao KN, Rengaraja D, Hekare A. Comparison of Application of Mitomycin C Vs Silicon Stenting Vs Conventional Method in Endonasal Dacrocystorhinostomy: A Randomized Controlled Trial of 150 Patients. Iran J Otorhinolaryngol 2018; 30:11-18. [PMID: 29387659 PMCID: PMC5787650] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 09/19/2017] [Indexed: 12/01/2022]
Abstract
INTRODUCTION Since the days of Hippocrates, many modifications have been proposed in endonasal dacrocystorhinostomy (DCR), with the use of new drugs and implants showing variable results. The objective of this study was to analyze whether the use of silicon tubing or mitomycin C administration has an added advantage over conventional endonasal DCR. MATERIALS AND METHODS A randomized controlled trial of 150 patients between the ages of 6 and 70 years presenting with epiphora was performed. Patients were randomly divided into three groups: endonasal DCR with mitomycin C administration, endonasal DCR with silicon stenting, or conventional endonasal DCR. Patients were followed up on Days 15, 30, 60 and 90 postoperatively for sac syringing to confirm patency. RESULTS The majority of patients (28.7%) were in the fourth decade of life, with a female predominance (65.3%). Dacrocystitis was most commonly seen in the left eye (58.7%). An intergroup comparison was performed using the Kruskal-Wallis test at the end of 3 and 5 months. The results suggest that the success rate was significantly higher in patients with a silicone stent (P=0.04) as compared with the other two groups, although no significant difference in failure rate was seen between patients on mitomycin C and conventional therapy (P=0.132 at Month 3 and P=0.481 at Month 5, Mann-Whitney U-test). CONCLUSION Our study shows that silicone tube stenting had a better success rate compared with the other two groups, with no significant statistical difference between the use of mitomycin C and the conventional technique.
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Affiliation(s)
| | - Vitthal D Kale
- Department of Otorhinolaryngology, Grant Medical College And Sir Jj Group Of Hospitals, Byculla, Mumbai, India.
| | - Karthik N Rao
- Department of Otorhinolaryngology, Grant Medical College And Sir Jj Group Of Hospitals, Byculla, Mumbai, India.
| | - Devkumar Rengaraja
- Department of Otorhinolaryngology, Grant Medical College And Sir Jj Group Of Hospitals, Byculla, Mumbai, India.
| | - Amol Hekare
- Department of Otorhinolaryngology, Grant Medical College And Sir Jj Group Of Hospitals, Byculla, Mumbai, India.
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Takkar N, Takkar JP, Padmakumar R, Patil NA, Rao KN, Bhattacharje D. Assessment of Cardiac Autonomic Function by Post Exercise Heart Rate Recovery in Diabetics. Romanian Journal of Diabetes Nutrition and Metabolic Diseases 2017. [DOI: 10.1515/rjdnmd-2017-0034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Background and Aims: Autonomic dysfunction in type 2 diabetes mellitus (DM) patients may translate into an increased cardiovascular morbidity and mortality. Autonomic system regulates ‘heart rate recovery’ (HRR), an important predictor of cardiovascular mortality, which can be assessed using the exercise electrocardiogram (ECG). Hence, utilizing HRR, this study assessed the autonomic function of the cardiovascular system after one minute of exercise stress test in both, patients with and without type 2 DM.
Materials and Methods: A prospective case control study involving 50 patients with type 2 DM and 50 without type 2 DM, matched for age and sex, was carried out. Each subject underwent an exercise stress test by treadmill using the Bruce protocol. Cardiovascular parameters like heart rate was recorded using a 12 lead ECG along with blood pressure.
Results: Patients with T2DM had lesser HRR after exercise (p < 0.001). Exercise capacity was significantly reduced among patients with T2DM when compared to controls (p = 0.01). A multiple linear regression analysis (R2=0.26) revealed that duration of diabetes (β=−0.02, p=0.048) and resting systolic blood pressure (SBP) (β=−010, p=0.048) are independent predictors of HRR.
Conclusion: The study revealed HRR to be significantly reduced among patients with type 2 DM. HRR may hint at the presence of cardiac autonomic dysfunction and predict the cardiovascular mortality.
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Affiliation(s)
| | | | - R Padmakumar
- Department of Cardiology , Kasturba Medical College , Manipal Campus, Manipal University , Karnataka, India
| | - Navin A Patil
- Department of Pharmacology , Kasturba Medical College , Manipal Campus, Manipal University , Karnataka, India
| | - Karthik N Rao
- Department of Medicine , Kasturba Medical College , Manipal Campus, Manipal University , Karnataka, India
| | - Dipanjan Bhattacharje
- Department of Pharmacology , Kasturba Medical College , Manipal Campus, Manipal University , Karnataka, India
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Chaudhuri S, Rao KN, Patil N, Ommurugan B, Varghese G. Addison's Disease Mimicking as Acute Pancreatitis: A Case Report. J Clin Diagn Res 2017; 11:OD12-OD13. [PMID: 28571196 PMCID: PMC5449842 DOI: 10.7860/jcdr/2017/26338.9638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 12/27/2016] [Accepted: 01/30/2017] [Indexed: 11/24/2022]
Abstract
Over past two decades there has been significant improvement in medical field in elucidating the underlying pathophysiology and genetics of Addison's disease. Adrenal insufficiency (Addison's disease) is a rare disease with an incidence of 0.8/100,000 cases. The diagnosis may be delayed if the clinical presentation mimics a gastrointestinal disorder or psychiatric illness. We report a case of Addison's disease presenting as acute pain in abdomen mimicking clinical presentation of acute pancreatitis.
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Affiliation(s)
- Sayani Chaudhuri
- Resident, Department of Biochemistry, IPGMER, SSKM Hospital, Kolkata, West Bengal, India
| | - Karthik N Rao
- Assistant Professor, Department of Medicine, KMC Manipal/Manipal University, Manipal, Karnataka, India
| | - Navin Patil
- Assistant Professor, Department of Pharmacology, KMC Manipal/Manipal University, Manipal, Karnataka, India
| | - Balaji Ommurugan
- Postgraduate Student, Department of Pharmacology, KMC Manipal/Manipal University, Manipal, Karnataka, India
| | - George Varghese
- Undergraduate Student, Department of Medicine, KMC Manipal/Manipal University, Manipal, Karnataka, India
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Rao KN, Jagade MV. Summer school in oncology - setting a benchmark in inspiring the future oncologists - a surgical postgraduate's perspective. Indian J Cancer 2017; 54:488. [DOI: 10.4103/ijc.ijc_254_17] [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: 11/04/2022]
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Jayaprakash B, Rao KN, Patil N, Bhattacharjee D, Maden M, Rau NR. Wernicke's Encephalopathy - 'Pushing the Envelope' of Patient's Profile: A Case Report. Ann Neurosci 2016; 23:188-193. [PMID: 27721589 DOI: 10.1159/000449186] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 04/17/2016] [Accepted: 05/13/2016] [Indexed: 11/19/2022] Open
Abstract
Wernicke's encephalopathy (WE), an acute neuropsychiatric condition, is caused by thiamine deficiency. Traditionally, it has been associated with patients with a background of alcoholism. However, in the past few decades, with increasing trends in the incidence of WE among patients without a history of alcohol consumption, a pressing need was felt to examine the existing guidelines for the management of WE and its sequelae. The need for a revision was felt as the guidelines for the management of WE were developed around the premise that this affliction is observed mainly among alcoholics. In light of the opportunity presented to us by one of our patients who did not 'fit the bill' of a traditional case of WE, we decided to compare and contrast the management of WE among patients with and without a background of alcoholism. After analyzing the available data on WE among alcoholics and non-alcoholics, we concluded that a high degree of suspicion should be kept in mind if any of the classical features are observed, with a special emphasis on eliciting the underlying causes through a detailed history. Furthermore, thiamine supplementation at a lower dose of 100-200 mg should be initiated first, followed by laboratory and radiological investigations.
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Affiliation(s)
- B Jayaprakash
- Department of Medicine, Kasturba Medical College, Manipal Campus, Manipal University, Mangalore, Karnataka, India
| | - Karthik N Rao
- Department of Medicine, Kasturba Medical College, Manipal Campus, Manipal University, Mangalore, Karnataka, India
| | - Navin Patil
- Department of Pharmacology, Kasturba Medical College, Manipal Campus, Manipal University, Mangalore, Karnataka, India
| | - Dipanjan Bhattacharjee
- Department of Pharmacology, Kasturba Medical College, Manipal Campus, Manipal University, Mangalore, Karnataka, India
| | - Mohit Maden
- Department of Pharmacology, Kasturba Medical College, Manipal Campus, Manipal University, Mangalore, Karnataka, India
| | - N R Rau
- Department of Medicine, Yenepoya Medical College, Mangalore, Karnataka, India
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Vallabhajosyula S, Vallabhajosyula S, Vallabhajosyula S, Nair S, Kamath A, Rao KN. Development of vascular complications and bladder carcinoma in diabetics using pioglitazone: A five-year Indian review. Med J Armed Forces India 2016; 72:253-7. [PMID: 27546965 DOI: 10.1016/j.mjafi.2016.06.004] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 06/13/2016] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Pioglitazone has better cardiovascular outcomes and a questionable relationship with bladder carcinoma in diabetes mellitus, type II (DM-2). We sought to evaluate the role of pioglitazone in the Indian population. METHODS This is a retrospective study at an academic medical center in India. All DM-2 patients in 2008 with a new prescription of pioglitazone were age- and gender-matched with non-users. We excluded patients with gestational DM or DM type I. They were followed forward for five years and demographic data, micro- and macro-vascular complications, mortality, and bladder carcinoma were recorded. Two-tailed p ≤ 0.05 was considered statistically significant. RESULTS Two cohorts of 260 patients, with mean age of 58 ± 11 years with 413 (79.4%) males, were followed for five years. Pioglitazone users had higher hypertension, obesity, DM-2 family history (all p < 0.003), and use of insulin and oral hypoglycemics (all p < 0.0001) in comparison to non-users. HbA1c was not different between groups. Over five years, pioglitazone users had lesser retinopathy and myocardial infarctions (all p < 0.01). Five cases of bladder carcinoma were noted, all in the pioglitazone group, however without statistical significance. Baseline variables, including mean daily pioglitazone dose, were not statistically different between patients with and without bladder carcinoma. Nephropathy and MI were independent predictors for development of bladder carcinoma within pioglitazone users. CONCLUSIONS Pioglitazone users had significantly lesser myocardial infarctions and retinopathy despite more difficult to control DM 2. In an age- and gender-matched cohort of users and non-users, pioglitazone did not contribute to development of bladder cancer in the Indian population.
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Affiliation(s)
| | | | - Saraschandra Vallabhajosyula
- Assistant Professor (Medicine), Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN, USA
| | - Suma Nair
- Associate Professor (Medicine), Kasturba Medical College, Manipal University, Manipal, India
| | - Asha Kamath
- Associate Professor (Medicine), Kasturba Medical College, Manipal University, Manipal, India
| | - Karthik N Rao
- Assistant Professor (Medicine), Kasturba Medical College, Manipal University, Manipal, India
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Prasad RGSV, Phani AR, Rao KN, Kumar RR, Prasad S, Prabhakara G, Sheeja MS, Salins CP, Endrino JL, Raju DB. Biocompatible and Antibacterial SnO2 Nanowire Films Synthesized by E-Beam Evaporation Method. J Biomed Nanotechnol 2015; 11:942-50. [PMID: 26353584 DOI: 10.1166/jbn.2015.2025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this work, the biocompatibility and antibacterial activities of novel SnO2 nanowire coatings prepared by electron-beam (E-Beam) evaporation process at low temperatures were studied. The nanowire coatings were characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and X-ray diffraction (XRD) methods. The results of in vitro cytotoxicity and cell proliferation assays suggested that the SnO2 nanowire coatings were nontoxic and promoted the proliferation of C2C12 and L929 cells (> 90% viability). Cellular activities, cell adhesion, and lactate dehydrogenase activities were consistent with the superior biocompatibility of the nanowire materials. Notably, the nanowire coating showed potent antibacterial activity against six different bacterial strains. The antibacterial activity of the SnO2 material was attributed to the photocatalytic nature of SnO2. The antibacterial activity and biocompatibility of the newly developed SnO2 nanowire coatings may enable their use as coating materials for biomedical implants.
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Rau NR, Rao KN. Management of Hypertension: An Overview of Practice Trends in India. J Assoc Physicians India 2015; 63:11-12. [PMID: 26591138] [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: 06/05/2023]
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Rao KN, Suresh CG. Bowman–Birk protease inhibitor from the seeds of Vigna unguiculata forms a highly stable dimeric structure. Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics 2007; 1774:1264-73. [PMID: 17869196 DOI: 10.1016/j.bbapap.2007.07.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2007] [Revised: 07/02/2007] [Accepted: 07/16/2007] [Indexed: 10/23/2022]
Abstract
Different protease inhibitors including Bowman-Birk type (BBI) have been reported from the seeds of Vigna unguiculata. Protease isoinhibitors of double-headed Bowman-Birk type from the seeds of Vigna unguiculata have been purified and characterized. The BBI from Vigna unguiculata (Vu-BBI) has been found to undergo self-association to form very stable dimers and more complex oligomers, by size-exclusion chromatography and SDS-PAGE in the presence of urea. Many BBIs have been reported to undergo self-association to form homodimers or more complex oligomers in solution. Only one dimeric crystal structure of a BBI (pea-BBI) is reported to date. We report the three-dimensional structure of a Vu-BBI determined at 2.5 A resolution. Although, the inhibitor has a monomer fold similar to that found in other known structures of Bowman-Birk protease inhibitors, its quaternary structure is different from that commonly observed in this family. The structural elements responsible for the stability of monomer molecule and dimeric association are discussed. The Vu-BBI may use dimeric or higher quaternary association to maintain the physiological state and to execute its biological function.
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Affiliation(s)
- K N Rao
- Division of Biochemical Sciences, National Chemical Laboratory, Pune-411008, India
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Savithramma N, Sulochana C, Rao KN. Ethnobotanical survey of plants used to treat asthma in Andhra Pradesh, India. J Ethnopharmacol 2007; 113:54-61. [PMID: 17606346 DOI: 10.1016/j.jep.2007.04.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2007] [Accepted: 04/09/2007] [Indexed: 05/16/2023]
Abstract
Tribal and non-tribal inhabitants of Andhra Pradesh used nearly 80 medicinal plants for treating asthma. The tribal people have a strong faith and belief in the traditional health care system, through herbal treatment. Plant species are generally used along with other materials and plant products in different combinations to effective cure. Herbalists reported that plant ingredients are used in the form of dry powder, decoction and juice in the treatment of asthma. The knowledge of most asthma drug plants used in herbal treatment and their method of using them are confined to some of the local healers. Some of the plants mentioned by local healers however, are extensively used nationally in the preparation of Ayurvedic medicines including those to treat asthma. Clinical and pharmacological data are available for these plants. Most of the plants used for treating asthma by local herbalists appear not to have been recorded hitherto.
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Affiliation(s)
- N Savithramma
- Department of Botany, S.V. University, Tirupati 517502, Andhra Pradesh, India.
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Affiliation(s)
- S Chakraborty
- Depts of Paediatrics, Leicester Royal Infirmary, Leicester, UK
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Rao KN, Suresh CG, Katre UV, Gaikwad SM, Khan MI. Two orthorhombic crystal structures of a galactose-specific lectin from Artocarpus hirsuta in complex with methyl-alpha-D-galactose. Acta Crystallogr D Biol Crystallogr 2004; 60:1404-12. [PMID: 15272163 DOI: 10.1107/s090744490401354x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2003] [Accepted: 06/04/2004] [Indexed: 11/11/2022]
Abstract
Based on their carbohydrate specificity, the jacalin family of lectins can be divided into two groups: galactose-specific and mannose-specific. The former are cytoplasmic proteins, whereas the latter are localized in the storage vacuoles of cells. It has been proposed that the post-translational modification in some of the lectins that splits their polypeptide chains into two may be crucial for galactose specificity. The mannose-specific members of the family are single-chain proteins that lack the above modification. Although the galactose-specific and the mannose-specific jacalin-type lectins differ in their sequences, they share a common fold: the beta-prism I fold, which is characteristic of Moraceae plant lectins. Here, two crystal structures of a jacalin-related lectin from Artocarpus hirsuta, which is specific for galactose, in complex with methyl-alpha-D-galactose are reported. The lectin crystallized in two orthorhombic forms and one hexagonal form under similar conditions. The crystals had an unusually high solvent content. The structure was solved using the molecular-replacement method using the jacalin structure as a search model. The two orthorhombic forms were refined using data to 2.5 and 3.0 A resolution, respectively. The structures of the A. hirsuta lectin and jacalin are identical. In orthorhombic form I the crystal packing provides three different micro-environments for sugar binding in the same crystal. The observed difference in the specificity for oligosaccharides between the A. hirsuta lectin and jacalin could only be explained based on differences in the molecular associations in the packing and variation of the C-terminal length of the beta-chain. The observed insecticidal activity of A. hirsuta lectin may arise from its similar fold to domain II of the unrelated delta-endotoxin from Bacillus thuringiensis.
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Affiliation(s)
- K N Rao
- Division of Biochemical Sciences, National Chemical Laboratory, Pune-8, India
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Fridell JA, Jain AKB, Patel K, Virji M, Rao KN, Fung JJ, Venkataramanan R. Phenytoin decreases the blood concentrations of sirolimus in a liver transplant recipient: a case report. Ther Drug Monit 2003; 25:117-9. [PMID: 12548156 DOI: 10.1097/00007691-200302000-00019] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
This report documents that coadministration of phenytoin leads to decreased blood concentrations and area under the blood concentration-time curve of sirolimus in a liver transplant patient. It is essential to monitor the blood concentrations of sirolimus and adjust the sirolimus dosage when phenytoin administration begins or ends.
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Affiliation(s)
- Jonathan A Fridell
- Department of Surgery, Indiana University School of Medicine, Indianapolis, USA
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Rao KN, Gopinath R, Kumar MS, Suryanarayana I, Prasad PS. Interaction-induced enhancement in the activity and selectivity of a titania-supported ammonium salt of a 12-molybdophosphoric acid catalyst during ammoxidation of 2-methylpyrazine. Chem Commun (Camb) 2001:2088-9. [PMID: 12240176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
A titania-supported ammonium salt of 12-molybdophosphoric acid has been synthesized, and the salt-support interaction, which enhanced the reaction rate, has been correlated with the activity of the catalyst in the ammoxidation of 2-methylpyrazine.
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Affiliation(s)
- K N Rao
- Catalysis & Physical Chemistry Division, Indian Institute of Chemical Technology, Hyderabad-500 007, India
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Abstract
OBJECTIVE Children of alcoholics are at higher risk for physical injuries and malnutrition. In this study nutritional neglect and physical abuse in children of alcoholics has been compared with children of non-alcoholics in a General Hospital attached to a Medical College. METHODS 72 children of alcoholics were compared with 81 normal controls. 86.1% in case group and 49.4% in control group had malnourishment of various grades. RESULTS 45% of the children of alcoholics had physical injuries in contrast to 23.4% of children of non-alcoholics. Malnutrition co-existed in almost all injured children of alcoholics. CONCLUSION Alcoholism in parents of malnourished and injured children are frequently ignored in routine clinical evaluation. If the risk children are identified early some of the morbidity can be avoided.
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Affiliation(s)
- K N Rao
- Department of Psychiatry, JJM Medical College, Davangere, Karnataka-577 004
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Abstract
Lead nitrate when injected intravenously as a single dose to male Wistar rats causes a strong hepatic proliferative response followed by reabsorption of excess tissue within 10-14 days. The rate of cell proliferation in this hyperplastic model was positively correlated with hepatic de novo synthesis of cholesterol, stimulation of the hexose monophosphate shunt pathway of glucose metabolism and with alterations in serum lipoproteins.
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Affiliation(s)
- P Pani
- Istituto di Farmacologia e Patologia Biochimica, Università di Cagliari, Italy
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Rao KN, Joseph B. Value of measurement of hip movements in childhood hip disorders. J Pediatr Orthop 2001; 21:495-501. [PMID: 11433163] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
SUMMARY After the reproducibility of measurement of hip joint motion by different techniques was ascertained, the ranges of motion of hips of 325 normal schoolchildren ages 5 to 14 years were measured with a fluid level goniometer. All movements of the hip decreased in a nonlinear fashion with increasing age. The regression line with the closest fit to the mean values of each hip movement was that obtained by applying the sixth-order equation. A grid was designed to record the ranges of movement of the hip. The ranges of movement of 93 children with pathology in one or both hips were measured by the same technique and marked on the grid. Characteristic abnormal grid patterns were noted for each condition. Careful documentation of alterations in hip joint movement in children with symptoms related to the hip can be of value in establishing the diagnosis of the underlying pathology.
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Affiliation(s)
- K N Rao
- Orthopaedic Unit II (Paediatric Orthopaedic Service), Kasturba Medical College, Manipal, Karnataka, India
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Rao KN, Bhattacharya RK, Venkatachalam SR. Thymidylate synthase activity and the cell growth are inhibited by the beta-carboline-benzoquinolizidine alkaloid deoxytubulosine. J Biochem Mol Toxicol 2000; 12:167-73. [PMID: 9522276 DOI: 10.1002/(sici)1099-0461(1998)12:3<167::aid-jbt5>3.0.co;2-j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 02/06/2023]
Abstract
Employing thymidylate synthase (TS) (5, 10-CH2-H4PteGlu: dUMP C-methyltransferase, EC 2.1.1.45), a key target enzyme in chemotherapy, the biological activity of the beta-carboline-benzoquinolizidine alkaloid deoxytubulosine (DTB) isolated from the Indian medicinal plant Alangium lamarckii has been evaluated and assessed for the first time. The TS employed in the present studies was purified from Lactobacillus leichmannii. The DTB was demonstrated to exhibit potent cytotoxicity and inhibited the cell growth of L. leichmannii, and DTB potently inhibited TS activity (IC50 = 40 microM). The DTB concentrations > 80 microM resulted in a total loss of the TS activity, thus suggesting that the beta-carboline-benzoquinolizidine alkaloid is a promising potential antitumor agent. The DTB binding to TS appears to be irreversible and tight through a possible covalent linkage. Although DTB strongly binds to DNA, it is not known whether DTB binds to RNA associated with TS. Inhibition kinetics showed that TS has a Ki value of 7 x 10(-6) M for DTB and that the inhibition is a simple linear "noncompetitive" type.
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Affiliation(s)
- K N Rao
- Radiation Biology and Biochemistry Division, Bhabha Atomic Research Centre, Bombay, India.
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Rao KN. Purification and characterization of dihydrofolate reductase from Lactobacillus leichmannii. Indian J Biochem Biophys 2000; 37:121-9. [PMID: 10983423] [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: 02/17/2023]
Abstract
Dihydrofolate reductase (DHFR) (5,6,7,8-THF: NADDP+ oxidoreductase, EC 1.5.1.3) was purified 205-fold to apparent homogeneity from the crude extracts of Lactobacillus leichmannii. It has UV absorption maxima at 280 nm, M(r) of 20,000, Stokes radius of 0.34 nm and a S20.w value of 0.12 S. The preparation showed the presence of 168 amino acid residues with threonine and lysine as the NH2- and COOH- terminal end-groups respectively and a single reactive sulfhydryl group. pCMB inhibited the enzyme activity (IC50 = 2 microM). The enzyme has a pH optimum of 7.4 and is thermally inactivated at > 35 degrees C. It is activated by 0.1 M KCl and KI and 2 M urea. 3-4 M urea completely inactivated the enzyme. Enzyme has Km values of 3.5 microM and 6.2 microM for NADPH and DHF respectively, and a Ki value of 7 nM for MTX, the inhibition being competitive.
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Affiliation(s)
- K N Rao
- Radiation Biology & Biochemistry Division, Bhabha Atomic Research Centre, Mumbai, India.
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Rao KN, Venkatachalam SR. Inhibition of dihydrofolate reductase and cell growth activity by the phenanthroindolizidine alkaloids pergularinine and tylophorinidine: the in vitro cytotoxicity of these plant alkaloids and their potential as antimicrobial and anticancer agents. Toxicol In Vitro 2000; 14:53-9. [PMID: 10699361 DOI: 10.1016/s0887-2333(99)00092-2] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.9] [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: 11/18/2022]
Abstract
The phenanthroindolizidine plant alkaloids pergularinine (PGL) and tylophorinidine (TPD) isolated from the Indian medicinal herb Pergularia pallida have been evaluated for their biological activity and assessed for the first time employing dihydrofolate reductase (DHFR) (5,6,7,8-THF: NADP(+) oxidoreductase, EC 1.5.1.3) as the probe in the present investigations. The enzyme is a key target in cancer chemotherapy and has been purified from Lactobacillus leichmannii. Cytotoxicity studies showed that both PGL and TPD are potently toxic and inhibited the growth of L. leichmannii cells (IC(50)=45 and 40 microM, respectively). Both the alkaloids significantly inhibited DHFR activity (IC(50)=40 and 32 microM for PGL and TPD, respectively). Alkaloid concentrations greater than 75-95 microM resulted in a complete loss of DHFR activity. Our results are suggestive of the alkaloids as potential antimicrobial and antitumour compounds. Alkaloid binding to DHFR is slow and reversible. Inhibition kinetics revealed K(i) values of 9x10(-6) M and 7x10(-6) M for PGL and TPD, respectively for the enzyme and inhibition in both the cases was a simple linear 'non-competitive' type.
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Affiliation(s)
- K N Rao
- Radiation Biology and Biochemistry Division, Bhabha Atomic Research Centre, Trombay, India.
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Rao KN, Bhattacharya RK, Veankatachalam SR. Inhibition of thymidylate synthase by pergularinine, tylophorinidine and deoxytubulosine. Indian J Biochem Biophys 1999; 36:442-8. [PMID: 10844999] [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: 02/16/2023]
Abstract
The activity of thymidylate synthase (TS) purified in our laboratory from Lactobacillus leichmannii was inhibited by pergularinine (PGL) and tylophorinidine (TPD) and deoxytubulosine (DTB) isolated from the Indian medicinal plants Pergularia pallida and Alangium lamarckii respectively. Cytotoxicity studies showed that cell growth of L. leichmannii was inhibited (IC50 = 40-45 microM) by all the three alkaloids, the concentrations > 80-90 microM resulting in complete loss of the enzyme activity. Ki values of the enzyme calculated from Lineweaver-Burk and Dixon plots for PGL, TPD and DTB were 10 x 10(-6) M, 9 x 10(-6) M and 7 x 10(-6) M respectively. These are typed as 'non-competitive' inhibitors of TS. All the three alkaloids inhibited (IC50 = 50 microM) the elevated TS activity of leukocytes in cancer patients with clinically diagnosed chronic myelocytic leukemia (n = 10), acute lymphocytic leukemia (n = 8) and metastatic solid tumours (n = 3).
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Affiliation(s)
- K N Rao
- Radiation Biology and Biochemistry Division, Bhabha Atomic Research Centre, Mumbai, India.
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Rao KN, Hegde SS, Lewis RJ, Suresh CG. Crystallization and preliminary x-ray diffraction studies of a Bowman-Birk inhibitor from Vigna unguiculata seeds. Acta Crystallogr D Biol Crystallogr 1999; 55:1920-2. [PMID: 10531495 DOI: 10.1107/s0907444999010021] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A Bowman-Birk type trypsin/chymotrypsin inhibitor isolated from Vigna unguiculata seeds has been crystallized. Crystals were grown using the vapour-diffusion method at pH 4.0 using citrate/phosphate as a buffer and 30% saturated ammonium sulfate as precipitant. The crystals belonged to the monoclinic space group P2(1), with unit-cell parameters a = 32.4, b = 61.8, c = 32.9 A, beta = 114.5 degrees. The Matthews coefficient calculated assuming two molecules in the asymmetric unit was 1.95 A(3) Da(-1), which corresponds to a 37% solvent content. X-ray data were collected to 2.5 A resolution from a flash-frozen crystal. The structure was solved using the molecular-replacement method using tracy soybean inhibitor structure (PDB entry 1pi2) as a model.
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Affiliation(s)
- K N Rao
- Division of Biochemical Sciences, National Chemical Laboratory, Pune 411008, India
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Horn KD, Wax P, Schneider SM, Martin TG, Nine JS, Moraca MA, Virji MA, Aronica PA, Rao KN. Biomarkers of liver regeneration allow early prediction of hepatic recovery after acute necrosis. Am J Clin Pathol 1999; 112:351-7. [PMID: 10478140 DOI: 10.1093/ajcp/112.3.351] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.4] [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: 11/13/2022] Open
Abstract
Acute toxic hepatic necrosis is common and may be fatal. Predicting clinical outcome may be aided by following serum markers that could indicate recovery or may signify massive (substantial) destruction of functional liver mass. Previously, in a published case of chloroform poisoning, we serially assayed serum biomarkers of hepatocellular necrosis (aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, lactate dehydrogenase) and markers of hepatocellular regeneration (alpha-fetoprotein, retinol-binding protein, gamma-glutamyl transferase, and des-gamma-carboxyprothrombin). We noted a decline in necrotic markers and a synchronous elevation in regenerative markers, which could be suggestive of a favorable outcome in similar cases. We now report 6 Amanita mushroom poisonings with favorable outcome and 2 fatal acetaminophen poisonings in which the same markers were observed. Our results further support our hypothesis that a sustained decline in serum markers of hepatocyte necrosis with a concurrent elevation in regenerative markers could aid in prediction of favorable outcome in patients with acute liver injury.
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Affiliation(s)
- K D Horn
- Department of Pathology, University of Pittsburgh Medical Center, PA 15213, USA
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Abstract
There have been arguments both for and against a periodicity of 26-33 million years (Myr) in terrestrial and extraterrestrial records. The best way to identify such periodicity is the analysis of geomarine evolutionary records. We have analysed the marine sedimentary phosphorus burial rate (PBR), as fluctuations in this rate are strong indicators of the coupling of climate, continental weathering and ocean primary productivity. We find a statistically significant harmonic component of 33 +/- 3 Myr against the estimated robust background noise spectrum, supporting the idea that geomarine processes are cyclic.
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Affiliation(s)
- R K Tiwari
- Theoretical Geophysics Group, National Geophysical Research Institute, Hyderabad, India.
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Rao KN, Gurjar MM, Gaikwad SM, Khan MI, Suresh CG. Crystallization and preliminary X-ray studies of the basic lectin from the seeds of Artocarpus hirsuta. Acta Crystallogr D Biol Crystallogr 1999; 55:1204-5. [PMID: 10329786 DOI: 10.1107/s0907444999003571] [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: 11/10/2022]
Abstract
The basic lectin from Artocarpus hirsuta specific towards methyl alpha-galactose has been purified and crystallized using the hanging-drop vapour-diffusion method with ammonium sulfate as precipitant. Three different crystal forms, orthorhombic I, orthorhombic II and hexagonal, were grown under the same crystallization conditions. The orthorhombic forms belonged to space group P212121 with unit-cell dimensions a = 92.9, b = 99.8, c = 166. 2 A and a = 89.9, b = 121.9, c = 131.6 A, respectively. The unit-cell dimensions of the hexagonal form were a = b = 84.1 and c = 271.7 A and the space group was P6122.
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Affiliation(s)
- K N Rao
- Division of Biochemical Sciences, National Chemical Laboratory, Pune 411008, India
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Eagon PK, Teepe AG, Elm MS, Tadic SD, Epley MJ, Beiler BE, Shinozuka H, Rao KN. Hepatic hyperplasia and cancer in rats: alterations in copper metabolism. Carcinogenesis 1999; 20:1091-6. [PMID: 10357793 DOI: 10.1093/carcin/20.6.1091] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [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: 11/13/2022] Open
Abstract
We previously demonstrated that rats exposed to the peroxisome proliferator (PP) diethylhexylphthalate (DEHP) had reduced serum ceruloplasmin (CP) oxidase activity, which suggests tissue copper deposition. Copper is highly toxic in excess, and results in cellular damage and hepatocellular carcinomas (HCC). This study addresses changes in expression of copper-related genes and metal accumulation in hyperplastic liver and tumors induced by PP. Male rats were fed diets containing DEHP or clofibrate (CLF) for 3-60 days (hyperplasia) and 4-chloro-6-(2,3 xylidino)-2-pyrimidinyl-thio(N-beta-hydroxyethyl) acetamide for 10 months (HCC). During hyperplasia, an immediate and progressive decrease in serum CP activity was observed (P < 0.05), as were reductions in mRNA levels for both CP and Wilson's disease gene (WD gene, a P-type ATPase) (P < 0.05). Tumor-bearing rats had lower serum CP activity (P < 0.05), and CP and WD gene mRNA levels were reduced in tumors (P < 0.05), and in liver surrounding tumors (SL) (P < 0.05). Metallothionein mRNA showed no consistent changes during hyperplasia. Tumors showed a 2.5-fold induction of metallothionein mRNA (P < 0.05), and a 1.2-fold increase in SL. Temporal increases in liver copper content occurred during hyperplasia, with increases of 2-fold (DEHP) and 3.3-fold (CLF) at 60 days (P < 0.05). Copper content was 2.2-fold higher in tumors (P < 0.05) and 1.7-fold higher in SL; iron did not increase and zinc decreased temporally. Thus, copper accumulation and changes in copper-related gene expression may be contributing factors in liver neoplasia in PP-treated rats. Loss of CP results in decreased free radical scavenger capacity and thus may enhance oxidative damage induced by PPs.
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Affiliation(s)
- P K Eagon
- VA Medical Center, Pittsburgh, PA 15240, USA
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Abstract
With the availability of non-alcoholic beer, many patients are substituting non-alcoholic beer for regular beer. Moreover, several clinicians advocate the use of non-alcoholic beer by alcoholics when there is a possibility of relapse. However, patients with alcoholic end-stage liver disease can accumulate substantial circulating ethanol levels even when they consume non-alcoholic beer. We present a case of a patient with end-stage liver disease who achieved a blood alcohol level of 57 mg/dL after drinking non-alcoholic beer.
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Affiliation(s)
- A F DiMartini
- Western Psychiatric Institute and Clinic, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA.
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Rao KN, Venkatachalam SR. Dihydrofolate reductase and cell growth activity inhibition by the beta-carboline-benzoquinolizidine plant alkaloid deoxytubulosine from Alangium lamarckii: its potential as an antimicrobial and anticancer agent. Bioorg Med Chem 1999; 7:1105-10. [PMID: 10428380 DOI: 10.1016/s0968-0896(98)00262-4] [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] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Beta-carboline-benzoquinolizidine plant alkaloid deoxytubulosine (DTB) was evaluated and assessed for the first time for its biochemical and biological activity employing the biomarker dihydrofolate reductase (DHFR) (5,6,7,8-tetrahydrofolate: NADP+ oxidoreductase, EC 1.5.1.3) as the probe enzyme, a key target in cancer chemotherapy. DHFR, employed in the present investigations was purified from Lactobacillus leichmannii. DTB, isolated from the Indian medicinal plant Alangium lamarckii was demonstrated to exhibit potent cytotoxicity. The alkaloid potently inhibited the cell growth of L. leichmannii and the cellular enzyme activity of DHFR (IC50=40 and 30 microM for the cell growth and enzyme inhibitions, respectively). DTB concentrations >75 microM resulted in a total loss of the DHFR activity, thus suggesting that the beta-carboline-benzoquinolizidine plant alkaloid is a promising potential antitumor agent. Our results are also suggestive of its potential antimicrobial activity. DTB binding to DHFR appears to be slow and reversible. Inhibition kinetics revealed that DHFR has a Ki value of 5x10(-6) M for DTB and that the enzyme inhibition is a simple linear 'non-competitive' type.
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Affiliation(s)
- K N Rao
- Radiation Biology & Biochemistry Division, Bhabha Atomic Research Centre, Bombay, India.
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Suresh CG, Pundle AV, SivaRaman H, Rao KN, Brannigan JA, McVey CE, Verma CS, Dauter Z, Dodson EJ, Dodson GG. Penicillin V acylase crystal structure reveals new Ntn-hydrolase family members. Nat Struct Biol 1999; 6:414-6. [PMID: 10331865 DOI: 10.1038/8213] [Citation(s) in RCA: 99] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- C G Suresh
- Division of Biochemical Sciences, National Chemical Laboratory, Pune, India.
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Rao KN, Bhattacharya RK, Venkatachalam SR. beta-Carboline-benzoquinolizidine alkaloid deoxytubulosine inhibits thymidylate synthase activity in leukemic leukocytes from patients with chronic myeloblastic leukemia and acute lymphoblastic leukemia. Anticancer Drugs 1998; 9:727-32. [PMID: 9823431 DOI: 10.1097/00001813-199809000-00008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 11/26/2022]
Abstract
Precursor 2'-deoxythymidine 5'-monophosphate for DNA biosynthesis is supplied by thymidylate synthase (TS) (EC 2.1.1.45) through a de novo pathway and the enzyme levels are elevated in malignancy. TS is therefore a key target for cancer chemotherapy. Human leukocyte TS levels in patients with chronic myeloblastic leukemia (CML) and acute lymphoblastic leukemia (ALL) are highly elevated (66- and 33-fold, respectively) compared to the low baseline activity of normal healthy controls. Preliminary screening tests for the antitumor activity of the beta-carboline-benzoquinolizidine alkaloid deoxytubulosine (DTB) (isolated from the Indian medicinal plant Alanguim lamarckii) were performed employing in vitro inhibition studies on the leukemic leukocyte TS as the probe enzyme. Enzyme activity of the leukemic leukocytes was potently inhibited by DTB (IC50 = 50 microM) in both CML and ALL. The emetine alkaloid DTB was assessed for its biochemical and biological evaluation for the first time as a potential antileukemic agent.
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Affiliation(s)
- K N Rao
- Radiation Biology and Biochemistry Division, Bhabha Atomic Research Centre, Bombay, India
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Rao KN. Reversible inhibition by pyridoxal 5'-phosphate and irreversible inactivation by urea and guanidine hydrochloride of thymidylate synthase from Lactobacillus leichmannii. Indian J Biochem Biophys 1998; 35:229-35. [PMID: 9854903] [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: 02/09/2023]
Abstract
Pyridoxal 5'-phosphate reversibly inhibited thymidylate synthase from Lactobacillus leichmannii. The inhibition was competitive with dUMP (Ki = 1 microM) and non-competitive with 5,10-CH2-THF (Ki = 0.08 microM). Treatment of native or pCMB-treated enzyme with urea (5 M) or guanidine hydrochloride (4 M) resulted in inactivation and dissociation of the homodimer (74 kDa) into monomer (37 kDa).
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Affiliation(s)
- K N Rao
- Radiation Biology and Biochemistry Division, Bhabha Atomic Research Centre, Mumbai, India.
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Lohray BB, Bhushan V, Rao BP, Madhavan GR, Murali N, Rao KN, Reddy AK, Rajesh BM, Reddy PG, Chakrabarti R, Vikramadithyan RK, Rajagopalan R, Mamidi RN, Jajoo HK, Subramaniam S. Novel euglycemic and hypolipidemic agents. 1. J Med Chem 1998; 41:1619-30. [PMID: 9572887 DOI: 10.1021/jm970444e] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.3] [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: 02/07/2023]
Abstract
A series of [[(heterocyclyl)ethoxy]benzyl]-2,4-thiazolidinediones have been synthesized by the condensation of corresponding aldehyde 1 and 2,4-thiazolidinedione followed by hydrogenation. Both unsaturated thiazolidinedione 2 and its saturated counterpart 3 have shown antihyperglycemic activity. Many of these compounds have shown superior euglycemic and hypolipidemic activity compared to troglitazone (CS 045). The indole analogue DRF-2189 (3g) was found to be a very potent insulin sensitizer, comparable to BRL-49653 in genetically obese C57BL/6J-ob/ob and 57BL/KsJ-db/db mice. Pharmacokinetic and tissue distribution studies conducted on BRL-49653 and DRF-2189 (3g) indicate that these drugs are well-distributed in target tissues. On the basis of euglycemic activity as well as enhanced selectivity against reduction of triglycerides in plasma, DRF-2189 (3g) has been selected for further evaluation.
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Affiliation(s)
- B B Lohray
- Medicinal and Organic Chemistry, Pharmacology, and Clinical Research, Dr. Reddy's Research Foundation, Bollaram Road, Miyapur Hyderabad 500 050, India
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41
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Rao KN, Bhattacharya RK, Venkatachalam SR. Inhibition of thymidylate synthase and cell growth by the phenanthroindolizidine alkaloids pergularinine and tylophorinidine. Chem Biol Interact 1997; 106:201-12. [PMID: 9413547 DOI: 10.1016/s0009-2797(97)00065-3] [Citation(s) in RCA: 30] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Biological activity of the phenanthroindolizidine alkaloids pergularinine (PGL) and tylophorinidine (TPD) isolated from the Indian medicinal herb Pergularia pallida has been evaluated and assessed for the first time employing thymidylate synthase (TS) (5,10-CH2H4 PteGlu: dUMP-C-methyltransferase, EC 2.1.1.45), a key target enzyme in cancer chemotherapy. TS used in the present investigations was purified from Lactobacillus leichmannii. Toxicity studies showed that PGL and TPD were potently toxic and inhibited growth of L.leichmannii cells. Both PGL and TPD significantly inhibited TS activity (IC50 = 40 and 45 microM, respectively). PGL concentrations > 80 microM and TPD concentrations > 90 microM resulted in a complete loss of the TS activity, thus suggesting that both these phenanthroindolizidine alkaloids are promising potential antitumor agents. Our results show that the alkaloid-binding to TS is irreversibly tight through a probable covalent linkage. Inhibition kinetics reveal that the enzyme has Ki values of 10 x 10(-6) and 9 x 10(-6) M for PGL and TPD, respectively and that the inhibition in both the cases is a simple linear 'noncompetitive' type.
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Affiliation(s)
- K N Rao
- Radiation Biology and Biochemistry Division, Bhabha Atomic Research Centre, Bombay, India
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Rao KN, Elm MS, Kelly RH, Chandar N, Brady EP, Rao B, Shinozuka H, Eagon PK. Hepatic hyperplasia and cancer in rats: metabolic alterations associated with cell growth. Gastroenterology 1997; 113:238-48. [PMID: 9207284 DOI: 10.1016/s0016-5085(97)70101-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND & AIMS We showed previously that the peroxisome proliferators di(2-ethylhexyl)phthalate (DEHP), clofibrate, and 4-chloro-6-(2,3 xylidino)-2-pyrimidinylthio (N-beta-hydroxyl)acetamide (BR931) alter hepatic sex steroid metabolism and receptor expression during induction of hepatic hyperplasia and hepatocellular carcinoma (HCC) in rats. The aim of this study was to identify metabolic changes associated with cell growth during hyperplasia and HCC. METHODS Hepatic hyperplasia was induced in male rats by a diet containing DEHP and clofibrate for 3-60 days. HCC was induced by feeding a diet containing BR931, a more potent hepatocarcinogen, for 10 months. RESULTS Cholesterol biosynthesis was depressed in hyperplastic livers but increased in HCC. Glucose-6-phosphate dehydrogenase (G6PD) activity was inhibited in hyperplastic liver as well as in HCC, whereas malic enzyme activity increased severalfold. Protein and messenger RNA (mRNA) levels for both G6PD and malic enzyme increased in hyperplastic livers and HCC. mRNA levels for 3-hydroxy-3-methylglutaryl-coenzyme A reductase decreased in hyperplasia and increased in HCC, whereas low-density lipoprotein receptor mRNA increased in hyperplasia and decreased in HCC. CONCLUSIONS Neoplastic cells acquire a growth advantage by their capacity to synthesize cholesterol and obtain reduced nicotinamide adenine dinucleotide phosphate by the malic enzyme pathway when G6PD activity is inhibited by peroxisome proliferators.
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Affiliation(s)
- K N Rao
- Department of Pathology, University of Pittsburgh Medical Center, Pennsylvania 15213-2582, USA.
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Rao KN, Begum S. Self-enucleation in depression: a case report. Indian J Psychiatry 1996; 38:269-70. [PMID: 21584146 PMCID: PMC2970886] [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] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Self- enucleation is a rare and an extreme form of self - mutilation, most commonly reported in schizophrenia. Many forms of self - injuries have been described in depression. However severe form of self- mutilation without suicidal intention, especially self- enucleation is rarely reported. In the present case self- enucleation is described as an expression of aggression in a depressive patient threatened with inter-personal loss. Aggression turned inwards is one of the major psychodynamic explanations in depression. In depressive syndrome self- mutilation, whether mild or severe is an expression of loss of affective (aggression) control.
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Affiliation(s)
- K N Rao
- K.N. RAO MD., Professor of Psychiatry, J.J.M. Medical College, Davangere - 577 004
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Abstract
BACKGROUND & AIMS Both androgenic and estrogenic steroids have been implicated in the development and course of several liver diseases, including hepatocellular carcinoma. The aim of this study was to investigate temporal changes in hepatic estrogen and androgen receptors and hormone metabolism in a rat model of liver hyperplasia and carcinogenesis. METHODS Rats were fed hepatocarcinogenic peroxisome proliferator agents for 3 days to 10 months. Livers were examined for proliferation markers, activity and cellular distribution of sex steroid receptors, and key enzymes in sex hormone homeostasis. RESULTS At all times, liver weight and proliferation markers in treated rats were increased. Early exposure resulted in increased nuclear estrogen and androgen receptor activity in treated rats. Tumors that developed after 9-10 months showed a marked decrease in estrogen receptor activity and, in contrast, an increase in androgen receptor activity, as did liver surrounding the tumors. Both short-term and long-term exposure to the carcinogens resulted in dramatic reductions in steroid metabolism. CONCLUSIONS This study supports the thesis that, in preneoplastic stages such as hyperplasia, there is an elevation of both receptor activities and that the progression from hyperplasia to cancer results in suppression of estrogen receptor expression but maintenance of androgen receptor.
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Affiliation(s)
- P K Eagon
- Veterans Affairs Medical Center, Pittsburgh, Pennsylvania, USA
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Simile M, Pascale RM, De Miglio MR, Nufris A, Daino L, Seddaiu MA, Muroni MR, Rao KN, Feo F. Inhibition by dehydroepiandrosterone of growth and progression of persistent liver nodules in experimental rat liver carcinogenesis. Int J Cancer 1995; 62:210-5. [PMID: 7622298 DOI: 10.1002/ijc.2910620217] [Citation(s) in RCA: 22] [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] [Indexed: 01/26/2023]
Abstract
Dehydroepiandrosterone (DHEA) inhibits the development of early pre-neoplastic lesions and prevents tumor development in various tissues when given to animals during the initiation/promotion stages of carcinogenesis. Our purpose was to evaluate whether DHEA can also arrest the growth and progression of late lesions, such as persistent nodules (PNs) of rat liver. Male F344 rats were subjected to initiation by diethylnitrosamine followed by selection according to the "resistant hepatocyte" (RH) protocol. Fifteen weeks after initiation, when PNs were present in the liver, the rats were fed a diet with/without 0.6% DHEA for a maximum of 15 weeks. Glucose-6-phosphate dehydrogenase (G6PD) activity was 17- to 20-fold higher in PNs than in normal liver 15-30 weeks after initiation. It significantly decreased, in both liver and PNs, 16 hr after starting DHEA feeding. Further DHEA feeding for 3-15 weeks decreased G6PD activity by 55-58% in both tissues. Eight weeks after starting DHEA, a fall in the proportion of labeled cells, after continuous contact with 3H thymidine for 7 days, was found in nodules. Treatment for 15 weeks with DHEA caused a marked decrease in the number of nodules per liver, as well as in the incidence of PNs with diameters of 3-6 and > 6 mm, respectively, while it did not affect PNs with diameters < 3 mm. Nodules showing patterns of malignant transformation were present in 40% of rats not treated with DHEA, but not in DHEA-treated rats. All of 8 surviving rats not treated with DHEA had carcinomas at the 56th week, while only 1 out of 4 surviving rats treated with DHEA had carcinoma. These data indicate that DHEA inhibits G6PD activity in rat liver and in PNs in vivo. This is associated with growth restraint of PNs and results in inhibition of their progression to malignancy.
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Affiliation(s)
- M Simile
- Istituto di Patologia Generale, Università di Sassari, Italy
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46
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Pascale RM, Simile MM, De Miglio MR, Nufris A, Seddaiu MA, Muroni MR, Danni O, Rao KN, Feo F. Inhibition of 3-hydroxy-3-methylglutaryl-CoA reductase activity and gene expression by dehydroepiandrosterone in preneoplastic liver nodules. Carcinogenesis 1995; 16:1537-42. [PMID: 7614686 DOI: 10.1093/carcin/16.7.1537] [Citation(s) in RCA: 22] [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] [Indexed: 01/26/2023] Open
Abstract
Previous work has demonstrated that dehydroepiandrosterone (DHEA) strongly inhibits growth and de novo cholesterol (CH) biosynthesis in preneoplastic rat liver. Administration of a mixture of 4 ribo- or deoxyribonucleosides of adenine, guanine, cytosine and uracil/thymine, prevents growth inhibition but not inhibition of CH synthesis. The purpose of this paper was to identify the site of inhibition of CH synthesis by DHEA. Persistent nodules (PNs) were induced, in diethylnitrosamine-initiated male F344 rats, by 'resistant hepatocyte' protocol. Fifteen weeks after initiation, nodule bearing rats and normal controls received a diet containing 0.6% DHEA for 3 weeks. They were then killed. 3-Hydroxy-3-methylglutaryl-CoA reductase (HMGR) activity and mRNA levels were 18- and 14-fold higher, respectively in nodules than in normal liver. DHEA strongly inhibited HMGR activity in both tissues in vivo, but had a slight effect on HMGR activity, when added in vitro to the reaction mixture for determination of this activity. In vivo DHEA treatment caused a 65% decrease in the level of HMGR mRNA in PNs, which, however, does not seem to completely account for the decrease in HMGR activity (83%). Low density lipoprotein receptor (LDL-R) mRNA level underwent a slight decrease in PNs, with respect to control liver, which did not lead to a significant decrease in 125I-LDL binding to LDL-R. DHEA treatment caused 30% and 24% increases in LDL-R expression and 125I-LDL binding, respectively, in nodules. These observations indicate that in addition to HMGR gene expression, increased influx of LDL into preneoplastic cells may contribute to the deregulation of mevalonate synthesis by DHEA. The observation that HMGR activity and gene expression were still 3- to 5-fold higher in PNs of DHEA-treated rats than in control liver, and previous findings of preneoplastic liver cell growth in the presence of relatively low CH synthesis, suggest that even relatively low levels of mevalonate are sufficient for the growth of preneoplastic liver cells.
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Affiliation(s)
- R M Pascale
- Istituto di Patologia Generale, Universtà di Sassari, Italy
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Nine JS, Moraca M, Virji MA, Rao KN. Serum-ethanol determination: comparison of lactate and lactate dehydrogenase interference in three enzymatic assays. J Anal Toxicol 1995; 19:192-6. [PMID: 7564299 DOI: 10.1093/jat/19.3.192] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Gas chromatography is considered to be the reference method for ethyl alcohol determination. However, enzymatic ethanol assays have been developed for use in the clinical laboratory by several commercial vendors. Essentially, these assays utilize the oxidation of ethyl alcohol to acetaldehyde with concurrent reduction of nicotinamide adenine dinucleotide (NAD) to NADH while monitoring the increase in absorbance at 340 nm. The increase in absorbance is theoretically proportional to the ethanol concentration in the sample. Previously, several authors reported that increased concentrations of lactate and lactate dehydrogenase (LDH) can cause false-positive results with certain enzymatic ethyl alcohol assays. In the present investigation, we further studied the interference of lactate and LDH in three enzymatic assays. Apparent ethyl alcohol concentrations in serum spiked with lactate and LDH, as well as patient and autopsy samples, were determined by the Syva, Abbott, and Roche enzymatic assays and by gas chromatography. The effect of coenzyme depletion on the rate of reaction and the interference of hemolysis were also investigated. Based on our results we suggest that coenzyme depletion plays a major role in the severity of the false-positive ethyl alcohol result, and the interference from hemolysis has a negligible effect on these results. We also confirm the previous studies in showing that elevated serum-lactate and LDH concentrations can result in varying degrees of false-positive ethyl alcohol concentrations in the three enzymatic assays. This should be taken into consideration in the management of patients in a tertiary care medical center.
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Affiliation(s)
- J S Nine
- Department of Pathology, University of Pittsburgh Medical Center, Pennsylvania, USA
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Rao KN. The significance of the cholesterol biosynthetic pathway in cell growth and carcinogenesis (review). Anticancer Res 1995; 15:309-14. [PMID: 7762999] [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: 01/27/2023]
Abstract
Cholesterol is widely distributed in the animal kingdom and occurs in all cell membranes. Even though the majority of body cholesterol is synthesized by the liver and secreted as circulating lipoproteins, all cells in the body have genomic information for cholesterol biosynthesis. Cholesterol biosynthesis is under feedback regulation, and the cellular and circulating cholesterol levels are tightly regulated at several points, such as the rate limiting enzyme 3-hydroxy-3-methyl-glutaryl coenzyme A (HMG-CoA) reductase and farnesyl pyrophosphate synthetase and at the low density lipoprotein (LDL) receptor. The cholesterol content and the rate of cholesterol biosynthesis are elevated in proliferating normal tissues and tumors. Cholesterol biosynthesis happens much before DNA synthesis, and inhibiting cholesterol biosynthesis inhibits cell growth, suggesting a linkage between the cholesterol and DNA synthetic pathways. The exact nature of this linkage is not known. However, recent evidence that the farnesyl moiety in the cholesterol biosynthetic pathway is necessary for the activation of G-proteins, and of the ras oncoprotein P21 has provided a probable basis for understanding this linkage, through signal transduction pathways. Thus, farnesylation of G proteins and ras oncoprotein P21 underscores the importance of the cholesterol biosynthetic pathway in cell growth and carcinogenesis. During normal cell growth and differentiation, LDL acts as a negative growth regulator and growth factors as positive signals, the neoplastic cell achieving autocrine growth due to the activation of protooncogens. It is interesting to note that in several types of cancer, the ras gene is mutated; these mutations could increase GTP binding, and lead to an activated p21. The activation of p21 would then be aided by continuous farnesylation due to stimulation of the cholesterol biosynthetic pathway in tumors. The cholesterol biosynthetic pathway, and ras p21 could therefore be used as targets for chemoprevention of cancer.
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Affiliation(s)
- K N Rao
- Department of Pathology, University of Pittsburgh School of Medicine, PA 15261, USA
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Rao KN. Denaturation of pteroylpoly-gamma-glutamyl hydrolase from chicken liver by urea, thiourea and guanidine hydrochloride: altered catalytic properties of the enzyme activated by urea. Indian J Biochem Biophys 1995; 32:11-20. [PMID: 7665190] [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: 01/26/2023]
Abstract
The effects of varying concentrations of urea, thiourea and guanidine hydrochloride on the enzyme activity and the isoenzymic polypeptide association of pteroylpoly-gamma-glutamyl hydrolase (EC 3.4.22.12) from chicken liver were studied. Incubation of the enzyme at 4 degrees C with low concentrations of the buffered (100 mM sodium acetate containing 1% ascorbate, pH 4.1) solutions of urea (0.55 M) and guanidine hydrochloride (0.05 M) resulted in stimulation (5- and 2-fold respectively) of the activity of the enzyme whereas at higher concentrations of the denaturants (6 M urea, 1 M thiourea or 2 M guanidine hydrochloride) the enzyme was completely inactivated. However, there was no enzyme activation in response to thiorea treatment. Under specific denaturing conditions the association of two isoenzymic polypeptides was studied. The 0.55 M urea- and 0.05 M guanidine hydrochloride-activated enzyme displayed its disaggregated nonidentical polypeptides I and II (M(r) = 41,000 and 17,300 respectively) on Sephadex G-100 gel filtration, SDS-PAGE and sedimentation analyses. The 8 M urea- and 3 M guanidine hydrochloride-inactivated enzyme on the other hand exhibited a single protein aggregate species of an M(r), 57,000 like the native enzyme. Both unmodified native enzyme and the pCMB-modified PtepolyGlu hydrolase responded similarly to these denaturants. The two constituent active polypeptides polyp-I and polyp-II of the heterodimeric gamma-glutamyl glutamyl hydrolase are dissociated in the presence of 0.55 M urea as evident from the PAGE analyses. Some catalytic properties of the activated enzyme were studied and compared with those of the native enzyme. The urea-activated enzyme displayed a shift in the second pH optimum of the double pH-activity profile (optima at pH 4.1 and pH 5.2) from pH 5.2 to pH 6.0. The activated enzyme has a Km value of 0.59 x 10(-6) M (Vmax, 0.10) for 5-CH3-H4PteGlu4 while the native enzyme has the Km of 0.83 x 10(-6) M (Vmax, 0.03) for this substrate. When the reaction mixtures were incubated with the urea-activated gamma-glutamyl hydrolase, a maximum stimulatory effect on the enzyme activity was observed with the bivalent metal ion Ca2+ whereas the most potent inhibitory effect was observed with the trivalent anion citrate.
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Affiliation(s)
- K N Rao
- Radiation Biology and Biochemistry Division, Bhabha Atomic Research Centre, Bombay, India
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Abstract
Exposure to a common phthalate, di(2-ethylhexyl)phthalate (DEHP), is associated with liver hyperplasia prior to the development of hepatocellular carcinoma in rodents. The exact mechanism of liver hyperplasia as well as tumorigenesis by this agent is not known. Since other lines of evidence point to estrogens as mediators of liver hyperplastic changes, we investigated whether DEHP exposure might alter hepatic estrogen metabolism and induce hyperplasia. Male Fischer 344 rats were fed either control or 1.2% DEHP-containing diets and sacrificed after 4, 8 and 16 weeks of exposure; activities of several sex hormone-responsive markers were measured. Rats fed DEHP had significantly increased serum estradiol levels, but hepatic activity of both cytosolic and nuclear estrogen receptor (ER) was significantly reduced. The serum content of ceruloplasmin, an estrogen-responsive protein synthesized by the liver, was also reduced, perhaps as a consequence of loss of ER activity. The rise in serum estradiol in DEHP-treated rats may be explained by the observation that these rats showed significant losses in hepatic activity of both a major male estrogen-metabolizing enzyme, estrogen 2-hydroxylase, and a male-specific estrogen-sequestering protein. In contrast to reductions in these activities, the expression of proliferating cell nuclear antigen and mRNAs for both ER and fos increased significantly as a result of exposure to DEHP. Our results suggest that changes in estrogen metabolism, receptor activity and activation of genes for cell proliferation are among the earliest metabolic alterations induced by DEHP. These changes together with the induced hyperplasia could play a crucial role in hepatocellular carcinoma development as a result of continuous exposure to DEHP.
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Affiliation(s)
- P K Eagon
- Veterans Affairs Medical Center, Pittsburgh, PA 15240
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