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Kim M, Vergara E, Tran A, Paul MJ, Kwon T, Ma JK, Jang Y, Reljic R. Marked enhancement of the immunogenicity of plant-expressed IgG-Fc fusion proteins by inclusion of cholera toxin non-toxic B subunit within the single polypeptide. Plant Biotechnol J 2024; 22:1402-1416. [PMID: 38163285 PMCID: PMC11022806 DOI: 10.1111/pbi.14275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 11/23/2023] [Accepted: 12/09/2023] [Indexed: 01/03/2024]
Abstract
Immunoglobulin G (IgG)-based fusion proteins have been widely exploited as a potential vaccine delivery platform but in the absence of exogenous adjuvants, the lack of robust immunity remains an obstacle. Here, we report on a key modification that overcomes that obstacle. Thus, we constructed an IgG-Fc vaccine platform for dengue, termed D-PCF, which in addition to a dengue antigen incorporates the cholera toxin non-toxic B subunit (CTB) as a molecular adjuvant, with all three proteins expressed as a single polypeptide. Following expression in Nicotiana benthamiana plants, the D-PCF assembled as polymeric structures of similar size to human IgM, a process driven by the pentamerization of CTB. A marked improvement of functional properties in vitro and immunogenicity in vivo over a previous iteration of the Fc-fusion protein without CTB [1] was demonstrated. These include enhanced antigen presenting cell binding, internalization and activation, complement activation, epithelial cell interactions and ganglioside binding, as well as more efficient polymerization within the expression host. Following immunization of mice with D-PCF by a combination of systemic and mucosal (intranasal) routes, we observed robust systemic and mucosal immune responses, as well as systemic T cell responses, significantly higher than those induced by a related Fc-fusion protein but without CTB. The induced antibodies could bind to the domain III of the dengue virus envelope protein from all four dengue serotypes. Finally, we also demonstrated feasibility of aerosolization of D-PCF as a prerequisite for vaccine delivery by the respiratory route.
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Affiliation(s)
- Mi‐Young Kim
- Department of Molecular BiologyJeonbuk National UniversityJeonjuRepublic of Korea
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Emil Vergara
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Andy Tran
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Matthew John Paul
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | | | - Julian K.C. Ma
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Yong‐Suk Jang
- Department of Molecular BiologyJeonbuk National UniversityJeonjuRepublic of Korea
| | - Rajko Reljic
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
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2
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Morales-Herrera S, Paul MJ, Van Dijck P, Beeckman T. SnRK1/TOR/T6P: three musketeers guarding energy for root growth. Trends Plant Sci 2024:S1360-1385(24)00062-1. [PMID: 38580543 DOI: 10.1016/j.tplants.2024.03.006] [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] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/28/2024] [Accepted: 03/08/2024] [Indexed: 04/07/2024]
Abstract
Sugars derived from photosynthesis, specifically sucrose, are the primary source of plant energy. Sucrose is produced in leaves and transported to the roots through the phloem, serving as a vital energy source. Environmental conditions can result in higher or lower photosynthesis, promoting anabolism or catabolism, respectively, thereby influencing the sucrose budget available for roots. Plants can adjust their root system to optimize the search for soil resources and to ensure the plant's adaptability to diverse environmental conditions. Recently, emerging research indicates that SNF1-RELATED PROTEIN KINASE 1 (SnRK1), trehalose 6-phosphate (T6P), and TARGET OF RAPAMYCIN (TOR) collectively serve as fundamental regulators of root development, together forming a signaling module to interpret the nutritional status of the plant and translate this to growth adjustments in the below ground parts.
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Affiliation(s)
- S Morales-Herrera
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium; VIB Center for Plant Systems Biology, Ghent, Belgium; Laboratory of Molecular Cell Biology, KU Leuven, Kasteelpark Arenberg, Leuven, Belgium
| | - M J Paul
- Sustainable Soils and Crops, Rothamsted Research, Harpenden, UK
| | - P Van Dijck
- Laboratory of Molecular Cell Biology, KU Leuven, Kasteelpark Arenberg, Leuven, Belgium; KU Leuven Plant Institute (LPI), Leuven, Belgium
| | - T Beeckman
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium; VIB Center for Plant Systems Biology, Ghent, Belgium.
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3
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Georgy JT, Singh A, John AO, Joel A, Andrews AG, Thumaty DB, Rebekah G, Sigamani E, Chandramohan J, Manipadam MT, Cherian AJ, Abraham DT, Paul MJ, Balakrishnan R, Backianathan S, Chacko RT. Pathological response and clinical outcomes in operable triple-negative breast cancer with cisplatin added to standard neoadjuvant chemotherapy. Klin Onkol 2021; 34:49-55. [PMID: 33657819 DOI: 10.48095/ccko202149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND Response to neoadjuvant chemotherapy is associated with improved outcomes for patients with triple negative breast cancer (TNBC). Patients with residual disease are at increased risk of relapse and death from breast cancer. In this retrospective study, we aimed to evaluate the efficacy and safety of cisplatin added to standard neoadjuvant chemotherapy for locally advanced TNBC. MATERIALS AND METHODS All TNBC treated with neoadjuvant cisplatin 60mg/m2 once in 3 weeks with weekly paclitaxel for 12 weeks, following 8 weeks of dose-dense epirubicin 90mg/m2 or doxorubicin 60mg/m2 with cyclophosphamide 600mg/m2 were analyzed retrospectively. The data related to pathological complete response, adherence to planned therapy, disease-free survival and overall survival were collected. RESULTS Eighty-three patients were included, of whom 80% had stage III disease. Pathological complete response in both breast (T0/Tis) and axilla (N0) was observed in 48.1% of patients. Miller Payne grade 5 pathological response in the breast was seen in 61% of patients. Good partial responses (Miller Payne grades 3,4) were observed in 32.5% of patients. The remaining 6.5% were poor responders. Seventy-seven patients underwent surgery. The disease-free survival at 1 and 3 years for those who had a pathological complete response was 96.7% and 77.6%, respectively, and 92.3% and 62.7% for those who did not, respectively. The predominant adverse events were hematological, with anemia being the most common one. CONCLUSION The addition of cisplatin to neoadjuvant chemotherapy with anthracycline and taxane in TNBC was tolerable and produced a high rate of pathological complete response. Cisplatin added to standard chemotherapy in patients with locally advanced TNBC could improve clinical outcomes.
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4
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Thomas JK, Kurian JJ, Cherian AJ, Hephzibah J, Paul MJ, Abraham DT. Papillary Thyroid Carcinoma in Children: Clinicopathological Profile and Outcomes of Management. World J Surg 2020; 45:496-506. [PMID: 33078217 DOI: 10.1007/s00268-020-05817-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/05/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND We aim to analyze the clinicopathological profile and outcomes of management for children with papillary thyroid carcinoma (PTC). METHODS Relevant clinical data of children ≤ 18 years of age managed for PTC between January 2006 and July 2018 as well as details of their follow-up till December 2019 were retrospectively collected and analyzed. RESULTS There were 82 children with PTC that were managed during the study period. At presentation, 39 (47.6%) had cervical lymphadenopathy, while 9 (11%) had systemic metastasis. Majority of patients 39 (47.6%) underwent total thyroidectomy with a selective neck dissection, while total thyroidectomy alone was performed in 26 (31.7%). Following surgery, hypocalcemia was seen in 39 (47.6%): 28 (34.1%) were temporary, while 11 (13.4%) were permanent. Twenty-eight (34%) developed persistent disease after surgery and 131I therapy. Significant risk factors for persistence and metastatic disease were metastatic cervical lymph node at presentation (p = 0.002) and tumor size (p = 0.014), respectively. The mean duration of follow-up was 60.3 (range 12-150) months with a mean overall disease-free survival of 60 months (95% CI 57.11, 77.95). CONCLUSION Children with papillary thyroid cancers present with aggressive disease, 47.6% with cervical nodal metastasis and 11% with distant metastasis in this cohort. The rate of post-thyroidectomy hypocalcemia in this study is substantial, and efforts to reduce it are actively being pursued. The presence of metastatic cervical lymph node at presentation (p = 0.002) and tumor size (p = 0.014) were the only significant risk factors for persistent and metastatic disease, respectively, in this study.
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Affiliation(s)
- John K Thomas
- Dept of Pediatric Surgery, Christian Medical College, Vellore, India
| | | | - Anish Jacob Cherian
- Dept of Endocrine Surgery, Christian Medical College and Hospital, Vellore, India.
| | - Julie Hephzibah
- Dept of Nuclear Medicine, Christian Medical College, Vellore, India
| | - M J Paul
- Dept of Endocrine Surgery, Christian Medical College and Hospital, Vellore, India
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Diego-González L, Crecente-Campo J, Paul MJ, Singh M, Reljic R, Alonso MJ, González-Fernández Á, Simón-Vázquez R. Design of Polymeric Nanocapsules for Intranasal Vaccination against Mycobacterium Tuberculosis: Influence of the Polymeric Shell and Antigen Positioning. Pharmaceutics 2020; 12:E489. [PMID: 32481601 PMCID: PMC7355676 DOI: 10.3390/pharmaceutics12060489] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 05/26/2020] [Accepted: 05/26/2020] [Indexed: 02/07/2023] Open
Abstract
Tuberculosis (TB) is the leading cause of death from a single infectious microorganism and Bacillus Calmette Guerin (BCG), the only authorized vaccine, does not confer protection against pulmonary TB. Based on the hypothesis that mucosal protection could help to prevent the infection at the site of entrance, the objective of this work was to develop an intranasal vaccine against Mycobacterium tuberculosis (Mtb), the microorganism that causes TB. Our approach consisted of the use of polymeric nanocapsules (NCs) with an oily core and a polymer shell made of chitosan (CS) or inulin/polyarginine (INU/pArg). The immunostimulant Imiquimod, a Toll-like receptor-7 (TLR-7) agonist, was encapsulated in the oily core and a fusion protein, formed by two antigens of Mtb, was absorbed either onto the NC surface (CS:Ag and INU:pArg:Ag) or between two polymer layers (INU:Ag:pArg) in order to assess the influence of the antigen positioning on the immune response. Although CS NCs were more immunostimulant than the INU/pArg NCs in vitro, the in vivo experiments showed that INU:pArg:Ag NCs were the only prototype inducing an adequate immunoglobulin A (IgA) response. Moreover, a previous immunization with BCG increased the immune response for CS NCs but, conversely, decreased for INU/pArg NCs. Further optimization of the antigen and the vaccination regime could provide an efficacious vaccine, using the INU:pArg:Ag NC prototype as nanocarrier.
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Affiliation(s)
- Lara Diego-González
- Inmunología, Centro de Investigaciones Biomédicas, CINBIO, Universidade de Vigo, Campus Universitario Lagoas Marcosende, 36310 Vigo, Spain; (L.D.-G.); (Á.G.-F.)
- Instituto de Investigación Sanitaria Galicia Sur (IIS-GS), SERGAS-UVIGO, Estrada de Clara Campoamor, 341, 36312 Vigo, PO, Spain
| | - José Crecente-Campo
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, School of Pharmacy, Campus Vida, Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), IDIS Research Institute, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain;
| | - Matthew John Paul
- Institute for Infection and Immunity, St George’s Medical School, London SW17 0RE, UK; (M.J.P.); (R.R.)
| | | | - Rajko Reljic
- Institute for Infection and Immunity, St George’s Medical School, London SW17 0RE, UK; (M.J.P.); (R.R.)
| | - María José Alonso
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, School of Pharmacy, Campus Vida, Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), IDIS Research Institute, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain;
| | - África González-Fernández
- Inmunología, Centro de Investigaciones Biomédicas, CINBIO, Universidade de Vigo, Campus Universitario Lagoas Marcosende, 36310 Vigo, Spain; (L.D.-G.); (Á.G.-F.)
- Instituto de Investigación Sanitaria Galicia Sur (IIS-GS), SERGAS-UVIGO, Estrada de Clara Campoamor, 341, 36312 Vigo, PO, Spain
| | - Rosana Simón-Vázquez
- Inmunología, Centro de Investigaciones Biomédicas, CINBIO, Universidade de Vigo, Campus Universitario Lagoas Marcosende, 36310 Vigo, Spain; (L.D.-G.); (Á.G.-F.)
- Instituto de Investigación Sanitaria Galicia Sur (IIS-GS), SERGAS-UVIGO, Estrada de Clara Campoamor, 341, 36312 Vigo, PO, Spain
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6
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Johnson C, Aalseth CE, Alexander TR, Bowyer TW, Chipman V, Day AR, Drellack S, Fast JE, Fritz BG, Hayes JC, Huckins-Gang HE, Humble P, Kirkham RR, Lowrey JD, Mace EK, Mayer MF, McIntyre JI, Milbrath BD, Panisko ME, Paul MJ, Obi CM, Okagawa RK, Olsen KB, Ripplinger MD, Seifert A, Suarez R, Thomle J, Townsend MJ, Woods VT, Zhong L. Migration of noble gas tracers at the site of an underground nuclear explosion at the Nevada National Security Site. J Environ Radioact 2019; 208-209:106047. [PMID: 31526956 DOI: 10.1016/j.jenvrad.2019.106047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 09/06/2019] [Accepted: 09/09/2019] [Indexed: 06/10/2023]
Abstract
As part of an underground gas migration study, two radioactive noble gases (37Ar and 127Xe) and two stable tracer gases (SF6 and PFDMCH) were injected into a historic nuclear explosion test chimney and allowed to migrate naturally. The purpose of this experiment was to provide a bounding case (natural transport) for the flow of radioactive noble gases following an underground nuclear explosion. To accomplish this, soil gas samples were collected from a series of boreholes and a range of depths from the shallow subsurface (3 m) to deeper levels (~160 m) over a period of eleven months. These samples have provided insights into the development and evolution of the subsurface plume and constrained the relative migration rates of the radioactive and stable gas species in the case when the driving pressure from the cavity is low. Analysis of the samples concluded that the stable tracer SF6 was consistently enriched in the subsurface samples relative to the radiotracer 127Xe, but the ratios of SF6 and 37Ar remained similar throughout the samples.
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Affiliation(s)
- C Johnson
- Pacific Northwest National Laboratory, Richland, WA, USA.
| | - C E Aalseth
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - T R Alexander
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - T W Bowyer
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - V Chipman
- Mission Support and Test Services LLC, Las Vegas, NV, USA
| | - A R Day
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - S Drellack
- Mission Support and Test Services LLC, Las Vegas, NV, USA
| | - J E Fast
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - B G Fritz
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - J C Hayes
- Pacific Northwest National Laboratory, Richland, WA, USA
| | | | - P Humble
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - R R Kirkham
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - J D Lowrey
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - E K Mace
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - M F Mayer
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - J I McIntyre
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - B D Milbrath
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - M E Panisko
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - M J Paul
- Sandia National Laboratories, Albuquerque, NM, USA
| | - C M Obi
- Mission Support and Test Services LLC, Las Vegas, NV, USA
| | - R K Okagawa
- Mission Support and Test Services LLC, Las Vegas, NV, USA
| | - K B Olsen
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - M D Ripplinger
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - A Seifert
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - R Suarez
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - J Thomle
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - M J Townsend
- Mission Support and Test Services LLC, Las Vegas, NV, USA
| | - V T Woods
- Pacific Northwest National Laboratory, Richland, WA, USA
| | - L Zhong
- Pacific Northwest National Laboratory, Richland, WA, USA
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7
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Kyne RF, Barrett AR, Brown LM, Paul MJ. Prepubertal ovarian inhibition of Light/Dark Box exploration and novel object investigation in juvenile Siberian hamsters. Horm Behav 2019; 115:104559. [PMID: 31310759 DOI: 10.1016/j.yhbeh.2019.07.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 07/01/2019] [Accepted: 07/12/2019] [Indexed: 11/24/2022]
Abstract
The overwhelming majority of research on the role of gonadal hormones in behavioral development has focused on perinatal, pubertal, or adult life stages. The juvenile period has been overlooked because it is thought to be a time of gonadal quiescence. In the present study, we tested whether prepubertal gonadectomy impacts the behavior of male and female juvenile hamsters on the Light/Dark Box, Novel Object, and Social Approach tests (Experiment 1) and compared these findings to those obtained after adult gonadectomy (Experiment 2). Prepubertal ovariectomy increased exploration (i.e. time spent in the light zone of the Light/Dark Box) and novel object investigation of juveniles indicating an inhibitory role for the juvenile ovary; social approach was unaffected. In contrast, adult ovariectomy and castration (both prepubertal and adult) had no effect on any behavioral measure. Experiment 3 tested whether rearing hamsters in a short day length (SD), which delays puberty in this species, extends the interval of juvenile ovarian inhibition on exploration and novelty seeking. We also tested whether provision of estradiol reverses the effects of prepubertal ovariectomy. Hormonal manipulations and behavioral tests of Experiment 3 were conducted at ages when long day-reared hamsters are adult (as in Experiment 2), but SD-reared hamsters remain reproductively immature. Ovariectomy again increased exploration in the SD-reared juveniles despite the older age of surgery and testing. Estradiol treatment had no effect. These findings reveal a novel role for the juvenile ovary in exploration and novelty seeking that is unlikely to be mediated exclusively by estradiol.
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Affiliation(s)
- R F Kyne
- Department of Psychology, University at Buffalo SUNY, Buffalo, NY, USA; Neuroscience Program, University at Buffalo SUNY, Buffalo, NY, USA.
| | - A R Barrett
- Department of Psychology, University at Buffalo SUNY, Buffalo, NY, USA.
| | - L M Brown
- Department of Psychology, University at Buffalo SUNY, Buffalo, NY, USA.
| | - M J Paul
- Department of Psychology, University at Buffalo SUNY, Buffalo, NY, USA; Neuroscience Program, University at Buffalo SUNY, Buffalo, NY, USA; Evolution, Ecology, and Behavior Program, University at Buffalo SUNY, Buffalo, NY, USA.
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Schatz KC, Brown LM, Barrett AR, Roth LC, Grinevich V, Paul MJ. Viral rescue of magnocellular vasopressin cells in adolescent Brattleboro rats ameliorates diabetes insipidus, but not the hypoaroused phenotype. Sci Rep 2019; 9:8243. [PMID: 31160697 PMCID: PMC6546688 DOI: 10.1038/s41598-019-44776-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 05/23/2019] [Indexed: 12/27/2022] Open
Abstract
Dysregulated arousal often accompanies neurodevelopmental disorders such as attention deficit hyperactivity disorder and autism spectrum disorder. Recently, we have found that adolescent homozygous Brattleboro (Hom) rats, which contain a mutation in the arginine vasopressin (AVP) gene, exhibit lower behavioral arousal than their heterozygous (Het) littermates in the open field test. This hypoaroused phenotype could be due to loss of AVP in magnocellular cells that supply AVP to the peripheral circulation and project to limbic structures or parvocellular cells that regulate the stress axis and other central targets. Alternatively, hypoarousal could be a side effect of diabetes insipidus - polydipsia and polyuria seen in Hom rats due to loss of AVP facilitation of water reabsorption in the kidney. We developed a viral-rescue approach to "cure" magnocellular AVP cells of their Brattleboro mutation. Infusion of a recombinant adeno-associated virus (rAAV) containing a functional Avp gene and promoter (rAAV-AVP) rescued AVP within magnocellular cells and fiber projections of the paraventricular nucleus of the hypothalamus (PVN) of male and female adolescent Hom rats. Furthermore, water intake was markedly reduced, ameliorating the symptoms of diabetes insipidus. In contrast, open field activity was unaffected. These findings indicate that the hyporaoused phenotype of adolescent Hom rats is not due to the loss of AVP function in magnocellular cells or a side effect of diabetes insipidus, but favors the hypothesis that central, parvocellular AVP mechanisms underlie the regulation of arousal during adolescence.
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Affiliation(s)
- K C Schatz
- Department of Psychology, University at Buffalo, SUNY, Buffalo, 14260, NY, USA.
| | - L M Brown
- Department of Psychology, University at Buffalo, SUNY, Buffalo, 14260, NY, USA
| | - A R Barrett
- Department of Psychology, University at Buffalo, SUNY, Buffalo, 14260, NY, USA
| | - L C Roth
- Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Heidelberg, 69120, Germany
- Letten Centre and GliaLab, Department of Physiology, Institute of Basic Medical Sciences, University of Oslo, 0317, Oslo, Norway
| | - V Grinevich
- Department of Molecular Neurobiology, Max Planck Institute for Medical Research, Heidelberg, 69120, Germany
- Schaller Group on Neuropeptides, German Cancer Research Center, Heidelberg, 69120, Germany
- Department of Neuropeptide Research for Psychiatry, Central Institute of Mental Health, Heidelberg University, Mannheim, 68159, Germany
| | - M J Paul
- Department of Psychology, University at Buffalo, SUNY, Buffalo, 14260, NY, USA
- Neuroscience Program, University at Buffalo, SUNY, Buffalo, 14260, NY, USA
- Evolution, Ecology and Behavior Program, University at Buffalo, SUNY, Buffalo, 14260, NY, USA
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9
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Schatz KC, Martin CD, Ishiwari K, George AM, Richards JB, Paul MJ. Mutation in the vasopressin gene eliminates the sex difference in social reinforcement in adolescent rats. Physiol Behav 2019; 206:125-133. [PMID: 30951747 DOI: 10.1016/j.physbeh.2019.04.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 12/06/2018] [Revised: 04/01/2019] [Accepted: 04/02/2019] [Indexed: 12/19/2022]
Abstract
The neuropeptide, arginine vasopressin (AVP), is thought to contribute to sex differences in normative and pathological social development by regulating social motivation. Recent studies using Brattleboro rats that have a mutation in the Avp gene, however, have suggested that AVP impacts adolescent social behaviors of males and females in a similar manner through actions on behavioral state (i.e., arousal). In the present study, we made use of a recently developed operant conditioning paradigm to test whether the chronic, lifelong AVP deficiency caused by the Brattleboro mutation impacts the reinforcement value of social stimuli during adolescence. Operant responding for access to a familiar conspecific was assessed in male and female adolescent wild type (WT; normal AVP), heterozygous Brattleboro (HET), and homozygous Brattleboro (HOM) rats. Following the social reinforcement test, rats were tested in the same operant paradigm except that the social reinforcer was replaced with a light reinforcer to determine whether effects of the Brattleboro mutation were specific to social stimuli or a general characteristic of operant conditioning. WT males directed a greater proportion of their responding toward the social and light stimuli than WT females; only males exhibited a preference for these reinforcers over unreinforced ports. The sex difference in social reinforcement was absent in HOM rats, whereas the sex difference in light reinforcement was present in all genotypes. These data indicate that adolescent males are more sensitive to the reinforcing properties of social and light stimuli, and that the sex difference in social, but not light, reinforcement depends upon normal levels of AVP. These findings support the hypothesis that AVP plays a critical role in sex differences in social development by acting on factors that influence social motivation.
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Affiliation(s)
- K C Schatz
- Department of Psychology, University at Buffalo, Buffalo, NY, USA.
| | - C D Martin
- Clinical and Research Institute on Addictions, University at Buffalo, Buffalo, NY, USA.
| | - K Ishiwari
- Clinical and Research Institute on Addictions, University at Buffalo, Buffalo, NY, USA.
| | - A M George
- Clinical and Research Institute on Addictions, University at Buffalo, Buffalo, NY, USA.
| | - J B Richards
- Clinical and Research Institute on Addictions, University at Buffalo, Buffalo, NY, USA.
| | - M J Paul
- Department of Psychology, University at Buffalo, Buffalo, NY, USA; Neuroscience Program, University at Buffalo, Buffalo, NY, USA; Evolution, Ecology and Behavior Program, University at Buffalo, Buffalo, NY, USA.
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10
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Paul MJ, Biegalski SR, Haas DA, Jiang H, Daigle H, Lowrey JD. Xenon adsorption on geological media and implications for radionuclide signatures. J Environ Radioact 2018; 187:65-72. [PMID: 29449040 DOI: 10.1016/j.jenvrad.2018.01.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 01/19/2018] [Accepted: 01/30/2018] [Indexed: 06/08/2023]
Abstract
The detection of radioactive noble gases is a primary technology for verifying compliance with the pending Comprehensive Nuclear-Test-Ban Treaty. A fundamental challenge in applying this technology for detecting underground nuclear explosions is estimating the timing and magnitude of the radionuclide signatures. While the primary mechanism for transport is advective transport, either through barometric pumping or thermally driven advection, diffusive transport in the surrounding matrix also plays a secondary role. From the study of primordial noble gas signatures, it is known that xenon has a strong physical adsorption affinity in shale formations. Given the unselective nature of physical adsorption, isotherm measurements reported here show that non-trivial amounts of xenon adsorb on a variety of media, in addition to shale. A dual-porosity model is then discussed demonstrating that sorption amplifies the diffusive uptake of an adsorbing matrix from a fracture. This effect may reduce the radioxenon signature down to approximately one-tenth, similar to primordial xenon isotopic signatures.
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Affiliation(s)
- M J Paul
- Nuclear Engineering Teaching Laboratory, The University of Texas at Austin, 10100 Burnet Rd, Bldg 159, Austin, TX 78758, USA.
| | - S R Biegalski
- Nuclear Engineering Teaching Laboratory, The University of Texas at Austin, 10100 Burnet Rd, Bldg 159, Austin, TX 78758, USA
| | - D A Haas
- Nuclear Engineering Teaching Laboratory, The University of Texas at Austin, 10100 Burnet Rd, Bldg 159, Austin, TX 78758, USA
| | - H Jiang
- Hildebrand Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, 200 E. Dean Keeton St, Austin, TX 78712, USA
| | - H Daigle
- Hildebrand Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, 200 E. Dean Keeton St, Austin, TX 78712, USA
| | - J D Lowrey
- Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland, WA 99354, USA
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Hart P, Copland A, Diogo GR, Harris S, Spallek R, Oehlmann W, Singh M, Basile J, Rottenberg M, Paul MJ, Reljic R. Nanoparticle-Fusion Protein Complexes Protect against Mycobacterium tuberculosis Infection. Mol Ther 2018; 26:822-833. [PMID: 29518353 PMCID: PMC5910664 DOI: 10.1016/j.ymthe.2017.12.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [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: 10/09/2017] [Revised: 12/14/2017] [Accepted: 12/18/2017] [Indexed: 11/26/2022] Open
Abstract
Tuberculosis (TB) is the leading cause of death from infectious disease, and the current vaccine, Bacillus Calmette-Guerin (BCG), is inadequate. Nanoparticles (NPs) are an emerging vaccine technology, with recent successes in oncology and infectious diseases. NPs have been exploited as antigen delivery systems and also for their adjuvantic properties. However, the mechanisms underlying their immunological activity remain obscure. Here, we developed a novel mucosal TB vaccine (Nano-FP1) based upon yellow carnauba wax NPs (YC-NPs), coated with a fusion protein consisting of three Mycobacterium tuberculosis (Mtb) antigens: Acr, Ag85B, and HBHA. Mucosal immunization of BCG-primed mice with Nano-FP1 significantly enhanced protection in animals challenged with low-dose, aerosolized Mtb. Bacterial control by Nano-FP1 was associated with dramatically enhanced cellular immunity compared to BCG, including superior CD4+ and CD8+ T cell proliferation, tissue-resident memory T cell (Trm) seeding in the lungs, and cytokine polyfunctionality. Alongside these effects, we also observed potent humoral responses, such as the generation of Ag85B-specific serum IgG and respiratory IgA. Finally, we found that YC-NPs were able to activate antigen-presenting cells via an unconventional IRF-3-associated activation signature, without the production of potentially harmful inflammatory mediators, providing a mechanistic framework for vaccine efficacy and future development.
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Affiliation(s)
- Peter Hart
- St George's Medical School, University of London, London SW17 0RE, UK
| | - Alastair Copland
- St George's Medical School, University of London, London SW17 0RE, UK
| | | | - Shane Harris
- St George's Medical School, University of London, London SW17 0RE, UK
| | | | | | | | | | | | - Matthew John Paul
- St George's Medical School, University of London, London SW17 0RE, UK
| | - Rajko Reljic
- St George's Medical School, University of London, London SW17 0RE, UK.
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Cherian AJ, Ramakant P, Pai R, Manipadam MT, Elanthenral S, Chandramohan A, Hephzibah J, Mathew D, Naik D, Paul TV, Rajaratnam S, Thomas N, Paul MJ, Abraham DT. Outcome of Treatment for Medullary Thyroid Carcinoma-a Single Centre Experience. Indian J Surg Oncol 2017; 9:52-58. [PMID: 29563735 DOI: 10.1007/s13193-017-0718-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 11/22/2017] [Indexed: 12/18/2022] Open
Abstract
We conducted this study to evaluate the demography, clinical presentation, management and outcomes of medullary thyroid carcinoma (MTC) from the Indian context. This was a retrospective study of patients with MTC managed between January 2008 and December 2016. All pertinent data was collected and the results were analysed using STATA (v.13.1). MTC accounted for 90/2022 (4.45%) patients managed with thyroid cancer during the study period. The mean age of presentation was 40 years (range 14-70 years) with 47 males and 43 females. The most common presentation included goitre with cervical lymphadenopathy seen in 60 patients (66.7%). There were 11 patients (12.2%) with systemic metastasis at presentation. Rearranged during transfection (RET) testing was performed in 71 patients and was positive in 25 (35.2%). The mutations among these patients were seen in the following codons: 634 (12), 804 (8), 790 (3) and 618 (2). Persistent hypercalcitoninemia (calcitonin > 50 pg/ml) was observed in 62/80 (77.5%) patients. Forty patients underwent a meta-iodo-benzyl-guanidine (MIBG) scan in the postoperative period, 10 were positive. The mean duration of follow-up was 32 months and 10 patients defaulted from follow-up. Sixteen patients developed metastasis during the period of follow-up while eight patients expired. The mean survival was 85.75 months (95% CI 78.7-92.7). MTC accounted for 4.5% of thyroid carcinomas in this cohort among which 35% were hereditary. Persistent hypercalcitoninemia following surgery is seen in more than 70% of patients but this does not affect survival. RET screening should be performed for all patients with MTC as curative surgery can be offered for mutation positive offspring.
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Affiliation(s)
- Anish Jacob Cherian
- 1Department of Endocrine Surgery, Christian Medical College and Hospital, Paul Brand building (1205), Vellore, Tamil Nadu India
| | - Pooja Ramakant
- 1Department of Endocrine Surgery, Christian Medical College and Hospital, Paul Brand building (1205), Vellore, Tamil Nadu India
| | - Rekha Pai
- 2Department of Molecular Pathology, Christian Medical College and Hospital, Vellore, India
| | | | - S Elanthenral
- 3Department of General Pathology, Christian Medical College and Hospital, Vellore, India
| | | | - Julie Hephzibah
- 5Department of Nuclear Medicine, Christian Medical College and Hospital, Vellore, India
| | - David Mathew
- 5Department of Nuclear Medicine, Christian Medical College and Hospital, Vellore, India
| | - Dhukabandhu Naik
- 6Department of Endocrinology, Christian Medical College and Hospital, Vellore, India
| | - Thomas V Paul
- 6Department of Endocrinology, Christian Medical College and Hospital, Vellore, India
| | - Simon Rajaratnam
- 6Department of Endocrinology, Christian Medical College and Hospital, Vellore, India
| | - Nihal Thomas
- 6Department of Endocrinology, Christian Medical College and Hospital, Vellore, India
| | - M J Paul
- 1Department of Endocrine Surgery, Christian Medical College and Hospital, Paul Brand building (1205), Vellore, Tamil Nadu India
| | - Deepak Thomas Abraham
- 1Department of Endocrine Surgery, Christian Medical College and Hospital, Paul Brand building (1205), Vellore, Tamil Nadu India
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Kim M, Van Dolleweerd C, Copland A, Paul MJ, Hofmann S, Webster GR, Julik E, Ceballos‐Olvera I, Reyes‐del Valle J, Yang M, Jang Y, Reljic R, Ma JK. Molecular engineering and plant expression of an immunoglobulin heavy chain scaffold for delivery of a dengue vaccine candidate. Plant Biotechnol J 2017; 15:1590-1601. [PMID: 28421694 PMCID: PMC5698049 DOI: 10.1111/pbi.12741] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 03/27/2017] [Accepted: 04/03/2017] [Indexed: 05/22/2023]
Abstract
In order to enhance vaccine uptake by the immune cells in vivo, molecular engineering approach was employed to construct a polymeric immunoglobulin G scaffold (PIGS) that incorporates multiple copies of an antigen and targets the Fc gamma receptors on antigen-presenting cells. These self-adjuvanting immunogens were tested in the context of dengue infection, for which there is currently no globally licensed vaccine yet. Thus, the consensus domain III sequence (cEDIII) of dengue glycoprotein E was incorporated into PIGS and expressed in both tobacco plants and Chinese Ovary Hamster cells. Purified mouse and human cEDIII-PIGS were fractionated by HPLC into low and high molecular weight forms, corresponding to monomers, dimers and polymers. cEDIII-PIGS were shown to retain important Fc receptor functions associated with immunoglobulins, including binding to C1q component of the complement and the low affinity Fcγ receptor II, as well as to macrophage cells in vitro. These molecules were shown to be immunogenic in mice, with or without an adjuvant, inducing a high level IgG antibody response which showed a neutralizing potential against the dengue virus serotype 2. The cEDIII-PIGS also induced a significant cellular immune response, IFN-γ production and polyfunctional T cells in both the CD4+ and CD8+ compartments. This proof-of-principle study shows that the potent antibody Fc-mediated cellular functions can be harnessed to improve vaccine design, underscoring the potential of this technology to induce and modulate a broad-ranging immune response.
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Affiliation(s)
- Mi‐Young Kim
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
- Department of Molecular Biology and The Institute for Molecular Biology and GeneticsChonbuk National UniversityJeonjuKorea
| | | | - Alastair Copland
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Matthew John Paul
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Sven Hofmann
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Gina R. Webster
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Emily Julik
- School of Life SciencesArizona State UniversityTempeAZUSA
| | | | | | - Moon‐Sik Yang
- Department of Molecular Biology and The Institute for Molecular Biology and GeneticsChonbuk National UniversityJeonjuKorea
| | - Yong‐Suk Jang
- Department of Molecular Biology and The Institute for Molecular Biology and GeneticsChonbuk National UniversityJeonjuKorea
| | - Rajko Reljic
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
| | - Julian K. Ma
- Institute for Infection and ImmunitySt George's University of LondonLondonUK
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Abstract
Dermatofibrosarcoma protuberans (DFSP) represents about 1% of soft-tissue sarcomas with an estimated incidence of 0.8 to 5.0 cases per million per year. This lesion may occur anywhere in the body but more than 50% occur on the trunk, 20% on the head and neck and 30% on the extremities. DFSP of the breast is an extremely uncommon site of presentation. Data regarding DFSP of the breast is limited and mostly in the form of case reports. Clinical presentation is not uniform and may mimic benign skin lesions [1]. However, it typically presents as a nodular cutaneous mass in early or mid-adult life. We herein report a case of DFSP of the breast in a 33-year-old lady who was managed successfully in our institute and review the literature associated with it.
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Affiliation(s)
- Suvendu Maji
- 1DNB Surgical Oncology, Chittaranjan National Cancer Institute, 37 SP Mukherjee Road, Kolkata, West Bengal 700026 India
| | - M J Paul
- 2Christian Medical College Vellore, Tamil Nadu, 632004 India
| | - Supriya Sen
- 3Department Of Endocrine Surgery, Christian Medical College Vellore, Tamil Nadu, 632004 India
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Ramakant P, Paul MJ, Paul TV, Rao SD, Abraham DT, Uttley L, Balasubramanian SP, Tharyan P. Surgery versus surveillance for asymptomatic (mild) primary hyperparathyroidism in adults 50 years or older. Hippokratia 2017. [DOI: 10.1002/14651858.cd010093.pub2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Pooja Ramakant
- CMC Vellore; Endocrine Surgery; Ida Scudder Road Vellore Tamil Nadu India 632004
| | - M J Paul
- CMC Vellore; Endocrine Surgery; Ida Scudder Road Vellore Tamil Nadu India 632004
| | - Thomas V Paul
- CMC Vellore; Department of Endocrinology; Ida Scudder Road Vellore Tamil Nadu India 632004
| | - Sudhaker D Rao
- Henry Ford Hospital; Division of Endocrinology and Bone and Mineral Metabolism; 3031 W. Grand Blvd Suite 800 Detroit Michigan USA 48202-2689
| | - Deepak T Abraham
- CMC Vellore; Endocrine Surgery; Ida Scudder Road Vellore Tamil Nadu India 632004
| | - Lesley Uttley
- University of Sheffield; School of Health and Related Research; Sheffield UK
| | - Sabapathy P Balasubramanian
- Sheffield Teaching Hospitals; Endocrine Surgery, Department of General Surgery; Glossop Road Sheffield South Yorkshire UK S10 2JF
| | - Prathap Tharyan
- Christian Medical College; Cochrane South Asia, Prof. BV Moses Center for Evidence-Informed Health Care and Health Policy; Carman Block II Floor CMC Campus, Bagayam Vellore Tamil Nadu India 632002
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Varghese SS, Sasidharan B, Manipadam MT, Paul MJ, Backianathan S. Radiotherapy in Phyllodes Tumour. J Clin Diagn Res 2017; 11:XC01-XC03. [PMID: 28274029 DOI: 10.7860/jcdr/2017/24591.9167] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 10/05/2016] [Accepted: 11/04/2016] [Indexed: 11/24/2022]
Abstract
INTRODUCTION Phyllodes Tumour (PT) of the breast is a relatively rare breast neoplasm (<1%) with diverse range of pathology and biological behaviour. AIM To describe the clinical course of PT and to define the role of Radiotherapy (RT) in PT of the breast. MATERIALS AND METHODS Retrospective analysis of hospital data of patients with PT presented from 2005 to 2014 was done. Descriptive statistics was used to analyze the results. Simple description of data was done in this study. Age and duration of symptoms were expressed in median and range. Percentages, tables and general discussions were used to understand the meaning of the data analyzed. RESULTS Out of the 98 patients, 92 were eligible for analysis. The median age of presentation was 43 years. A total of 64/92 patients were premenopausal. There was no side predilection for this tumour but 57/92 patients presented as an upper outer quadrant lump. Fifty percent of the patients presented as giant (10 cm) PT. The median duration of symptoms was 12 months (range: 1-168 months). A 60% of patients had Benign (B), 23% had Borderline (BL) and 17% had malignant (M) tumours. The surgical treatment for benign histology included Lumpectomy (L) for 15%, Wide Local Excision (WLE) for 48%, and Simple Mastectomy (SM) for 37%. All BL and M tumours were treated with WLE or SM. There was no recurrence in B and BL group when the margin was ≥1 cm. All non-metastatic M tumours received adjuvant RT irrespective of their margin status. Total 3/16 patients with M developed local recurrence. Total 6/16 M patients had distant metastases (lung or bone). Our median duration of follow up was 20 months (range: 1-120 months). CONCLUSION Surgical resection with adequate margins (>1 cm) gave excellent local control in B and BL tumours. For patients with BL PT, local radiotherapy is useful, if margins are close or positive even after the best surgical resection. There is a trend towards improved local control with adjuvant radiotherapy for malignant PT. Metastatic malignant PT has a poor outcome.
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Affiliation(s)
- Sunitha Susan Varghese
- Associate Physician, Department of Radiation Oncology, Christian Medical College , Vellore, Tamil Nadu, India
| | - Balukrishna Sasidharan
- Associate Professor, Department of Radiation Oncology, Christian Medical College , Vellore, Tamil Nadu, India
| | | | - M J Paul
- Professor, Department of Surgery, Christian Medical College , Vellore, Tamil Nadu, India
| | - Selvamani Backianathan
- Professor, Department of Radiation Oncology, Christian Medical College , Vellore, Tamil Nadu, India
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George A, Peter D, Pulimood S, Manipadam MT, George B, Paul MJ, Thomas JK. Rapidly progressing necrotic ulcerations and sinuses in specific cutaneous Hodgkin's disease. Indian Dermatol Online J 2016; 7:436-438. [PMID: 27730051 PMCID: PMC5038116 DOI: 10.4103/2229-5178.190503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Anisha George
- Department of Dermatology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Dincy Peter
- Department of Dermatology, Christian Medical College, Vellore, Tamil Nadu, India
| | - Susanne Pulimood
- Department of Dermatology, Christian Medical College, Vellore, Tamil Nadu, India
| | | | - Biju George
- Department of Haematology, Christian Medical College, Vellore, Tamil Nadu, India
| | - M J Paul
- Department of Surgery, Christian Medical College, Vellore, Tamil Nadu, India
| | - Jinu Kurian Thomas
- Department of Surgery, Christian Medical College, Vellore, Tamil Nadu, India
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18
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Anuradha C, Manipadam MT, Asha HS, Dukhabandhu N, Abraham D, Paul MJ. Can New Ultrasound Signs Help in Identifying Follicular Variant of Papillary Carcinoma of Thyroid? - A Pilot Study. Ultrasound Int Open 2016; 2:E47-53. [PMID: 27689170 DOI: 10.1055/s-0036-1582304] [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: 05/21/2015] [Accepted: 02/19/2016] [Indexed: 10/21/2022] Open
Abstract
AIM To describe two new ultrasound signs for thyroid nodules - "nodule in nodule" and "hypoechoic internal septae" and assess their usefulness in differentiating follicular variant of papillary thyroid carcinoma (FVPTC) from benign thyroid nodules (BTN). METHODOLOGY Ultrasound findings of 210 patients with histopathologically proven FVPTC (68 nodules, M:F=13:47 with mean age of 39.5±11.9 years) and BTN (165 nodules, (M:F=41:109 with mean age of 44±11.3 years) were retrospectively reviewed from PACS by a single radiologist blinded to the final diagnosis. Logistic regression analysis was performed to identify the best predictors of FVPTC and their diagnostic performance was assessed. RESULTS The "nodule in nodule" sign was seen in 80.9% of FVPTC and only 12.1% of BTN. The "hypoechoic internal septae" sign was seen in 44.1% of FVPTC and 17% of BTN. Younger patients, heterogeneous echotexture, nodule in nodule sign, thick incomplete non-uniform halo and presence of significant nodes were the best predictors of FVPTC (p<0.05). The sensitivity, specificity, positive predictive value, negative predictive value, accuracy and relative risk for FVPTC given as odds ratio (95% CI) for heterogeneous echotexture and nodule in nodule sign which were the best 2 predictors of FVPTC were 91.2%, 81.8%, 67.3%, 95.7%, 84.5%, 46.5 (18.5-117.4) and 80.9%, 87.7%, 74.3%, 91.2%, 86.2%, 32.5 (15.04-70.2), respectively. There was improvement in the specificity (91.5%) and accuracy (86.6%) when a combined criterion of heterogeneous echotexture and nodule in nodule sign was applied to predict FVPTC. CONCLUSION The "nodule in nodule" sign is common in FVPTC and when combined with heterogeneous echotexture can differentiate FVPTC and BTN with high specificity.
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Affiliation(s)
- C Anuradha
- Radiology, Christian Medical College, Vellore, India
| | - M T Manipadam
- Pathology, Christian Medical College, Vellore, India
| | - H S Asha
- Endocrinology, Christian Medical College, Vellore, India
| | - N Dukhabandhu
- Endocrinology, Christian Medical College, Vellore, India
| | - D Abraham
- Endocrine Surgery, Christian Medical College, Vellore, India
| | - M J Paul
- Endocrine Surgery, Christian Medical College, Vellore, India
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19
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Suganya S, Ramakant P, Palak R, Paul MJ. Malignant Peripheral Nerve Sheath Tumour of the Male Breast with Nodal Metastasis. Indian J Surg Oncol 2016; 6:440-2. [PMID: 27065671 DOI: 10.1007/s13193-015-0388-x] [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: 12/09/2014] [Accepted: 02/24/2015] [Indexed: 11/29/2022] Open
Abstract
Malignant peripheral nerve sheath tumour (MPNST) is a rare soft tissue sarcoma with high rate of local recurrences and metastases. Common sites include deeper soft tissues, usually in the proximity of a nerve trunk. MPNST of breast is a rare occurrence. To our knowledge there are only less than 10 case reports of MPNST of breast. We present a young male patient with MPNST and lymph node metastases and also discuss diagnostic modes and management challenges in such rare difficult scenarios.
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Affiliation(s)
- S Suganya
- Endocrine and Breast Surgery Department, Christian Medical College, Vellore, India
| | - Pooja Ramakant
- Endocrine and Breast Surgery Department, Christian Medical College, Vellore, India
| | - Rayani Palak
- Pathology Department, Christian Medical College, Vellore, India
| | - M J Paul
- Endocrine and Breast Surgery Department, Christian Medical College, Vellore, India
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20
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Pai R, Ebenazer A, Paul MJ, Thomas N, Nair A, Seshadri MS, Oommen R, Shanthly N, Devasia A, Rebekah G, Jeyaseelan L, Rajaratnam S. Mutations seen among patients with pheochromocytoma and paraganglioma at a referral center from India. Horm Metab Res 2015; 47:133-7. [PMID: 24977658 DOI: 10.1055/s-0034-1376989] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Determining the mutational status of susceptibility genes including RET, VHL, SDHx (SDHB, SDHC, SDHD) among patients with pheochromocytoma/paraganglioma (PCC/PGL) is gaining importance. These genes have not been systematically characterized among patients with PCC/PGL from India. The aim of the work was to screen the most frequently mutated genes among patients with PCC/PGL to determine the frequency and spectrum of mutations seen in this region. Fifty patients with PCC/PGL treated at our tertiary care hospital between January 2010 and June 2012 were screened for mutations in susceptibility genes using an algorithmic approach. Thirty-two percent (16/50) of patients were found to be positive for mutations including mutations among RET (n=4), VHL (n=6), SDHB (n=3), and SDHD (n=3) genes. None of these patients were positive for SDHC mutations. A significant association was found between young patients with bilateral tumors and VHL mutations (p=0.002). Two of the 3 patients with extra-adrenal SDHB associated tumors, had unique mutations, viz., c.436delT (exon 5) and c.788_857del (exon 8), one of which was malignant. High frequency of mutations seen among patients in this study emphasizes the need to consider mutational analysis among Indian patients with PCC/PGL.
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Affiliation(s)
- R Pai
- Department of Pathology, Christian Medical College, Vellore, India
| | - A Ebenazer
- Department of Pathology, Christian Medical College, Vellore, India
| | - M J Paul
- Department of Endocrine Surgery, Christian Medical College, Vellore, India
| | - N Thomas
- Department of Endocrinology and Metabolism, Christian Medical College, Vellore, India
| | - A Nair
- Department of Endocrine Surgery, Christian Medical College, Vellore, India
| | - M S Seshadri
- Department of Endocrinology and Metabolism, Christian Medical College, Vellore, India
| | - R Oommen
- Department of Nuclear Medicine, Christian Medical College, Vellore, India
| | - N Shanthly
- Department of Nuclear Medicine, Christian Medical College, Vellore, India
| | - A Devasia
- Department of Urology, Christian Medical College, Vellore, India
| | - G Rebekah
- Department of Biostatistics, Christian Medical College, Vellore, India
| | - L Jeyaseelan
- Department of Biostatistics, Christian Medical College, Vellore, India
| | - S Rajaratnam
- Department of Endocrinology and Metabolism, Christian Medical College, Vellore, India
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21
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Sabaretnam M, Ramakant P, Abraham DT, Paul MJ. Preoperative ultrasonography assessment of vocal cord movement during thyroid and parathyroid surgery. World J Surg 2014; 37:1740. [PMID: 23354924 DOI: 10.1007/s00268-013-1921-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Sabaretnam M, Ramakant P, Abraham DT, Paul MJ. Radioactive iodine ablation does not prevent recurrences in patients with papillary thyroid microcarcinoma. Clin Endocrinol (Oxf) 2013; 79:444-5. [PMID: 23253032 DOI: 10.1111/cen.12130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sheela CS, Ramakant P, Shah G, Chandramohan V, Abraham D, Paul MJ. Primary squamous cell carcinoma of breast presenting as a cystic mass. J Postgrad Med 2013; 59:155-6. [PMID: 23793323 DOI: 10.4103/0022-3859.113839] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- C S Sheela
- Department of Endocrine and Breast Surgery, Christian Medical College, Vellore, Tamil Nadu, India
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Abstract
A qualitative study using in-depth interviews was carried out among patients and doctors working in a private hospital in Tamil Nadu, to understand perceptions of informed consent. Audio-recorded interviews were transcribed verbatim and a framework analytical approach was used in analysis. Emergent themes ranged from perceptions on informed consent, and discussing health concerns and decision making, to information provided by and expectations from doctors, and suggestions for improvement. Most patients were unfamiliar with the kind of information provided in the informed consent process; a few felt that the information was inadequate. Decision making about surgery was left mostly to the doctor. Poor literacy in patients was seen as a barrier to effective communication by doctors. Developing local language versions of consent forms supported by audiovisual aids is needed for patients to take a proactive role in their treatment process, and for doctors to be receptive to patients' needs and capacities.
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25
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Abstract
Epidermal cysts rarely occur in the head and neck region as compared to the dermoid cysts and when they do occur in this region, they present in the floor of the mouth. We are reporting a rare case of an epidermal cyst in the floor of the mouth, with a brief review of the literature.
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Affiliation(s)
- Suraj Mammen
- Department of Radiology, Department of Radiodiagnosis, Christian Medical College , Vellore, Tamil Nadu, India
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Ramakant P, Chakravarthy S, Cherian JA, Abraham DT, Paul MJ. Challenges in management of phyllodes tumors of the breast: A retrospective analysis of 150 patients. Indian J Cancer 2013; 50:345-8. [DOI: 10.4103/0019-509x.123625] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [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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Abstract
Significant recent interest has focussed on improving outcomes after emergency laparotomy. This retrospective database analysis estimated the annual incidence and associated inpatient costs of emergency laparotomy in England. Demographic, process and outcome data were collected for all patients undergoing emergency laparotomy in Brighton for two calendar years (2009-2010). Cost analysis assumed £16 per minute theatre time, and £282 per day ward bed and £1382 per day critical care bed costs. National incidence was confirmed from Hospital Episode Statistics and Office of National Statistics mid-year population data. In total, 768 patients underwent 850 emergency laparotomies. The incidence of emergency laparotomy was estimated as ∼1:1100 population. Thirty-six percent (276 patients) were admitted for a median (IQR [range]) of 5 (3-11 [1-76]) days of critical care. Postoperative median (IQR [range]) length of stay was 13 (8-24 [1-176]) days. Our estimated annual inpatient cost of emergency laparotomy for Brighton was ∼£5 million, equivalent to ∼£13 000 per patient, and for England, an annual estimated cost of ∼£650 million. However, 'Payment by Results' reimbursement amounted to a mean (SD) hospital income of just £6905 (2639) per patient, a net financial loss of ∼£6100 per patient, equivalent to a reimbursement shortfall nationally of ∼£300 million. We also found that patients > 70 years (46%) had significantly higher 30-day postoperative mortality (18% vs 6%, p < 0.0001), significantly prolonged median (IQR [range]) length of stay (15 (10-26 [1-123]) days vs 12 (7-22 [1-176]) days, p < 0.001) and incurred higher costs (median (IQR [range]) £9667 (6620-15 732 [1920-103 624]) vs £7467 (4975-14 251 [1178-118 060]), p < 0.001). Emergency laparotomy is a common procedure associated with considerable cost, particularly among elderly patients. A National Emergency Laparotomy Database will help provide an evidence base on which to improve clinical outcome and cost efficiency.
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Affiliation(s)
- S L Shapter
- Royal Sussex County Hospital, Brighton, East Sussex, UK
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Ramakant P, Cherian AJ, Abraham DT, Paul MJ. Factors predicting local recurrence in phyllodes tumor of the breast. J Clin Oncol 2012. [DOI: 10.1200/jco.2012.30.15_suppl.e19562] [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: 11/20/2022] Open
Abstract
e19562 Background: Phyllodes tumor of the breast (PT) has local recurrences resulting in higher morbidity and disfiguring reoperations. Aim to find factors predicting local recurrences in PT. Methods: Retrospective data analyzed with SPSS v.17 (Pearson Chi square test, Logistic regression test for multivariate analysis) done on patients with PT managed during 2000-2010. Results: In total 141 patients with PT, mean age was 40.44 years (+0.98) and mean tumor size 11.07 cm (+0.57). Preoperatively cytology done in 96 % and was suggestive of PT in 59%; core biopsy done in 58 % and was suggestive of PT in 93% Imaging done in 65%. The mean duration of lump- 2.2 years (+0.23). Thirty two patients (23%) presented with recurrence post lumpectomy done elsewhere. Adjuvant radiotherapy was given in 28% patients. In multivariate analysis, high stromal cellularity ( p 0.002), surgery type (p= 0.000) and recurrent status (p=0.05) at first time presentation showed statistically significant p values for odd’s ratios. Conclusions: Tumor size, margins, surgery type, histological features of high stromal hypercellularity, necrosis with high mitotic rates predicted recurrence in PT. Core biopsy is more accurate than fine needle biopsy in diagnosis and recommended in suspected cases to permit the correct initial surgery. [Table: see text]
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Affiliation(s)
| | | | | | - MJ Paul
- Christian Medical College, Vellore, India
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29
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Pai R, Nehru GA, Samuel P, Paul MJ, Thomas N, Premkumar JA, Hephzibah J, Shanthly N, Oommen R, Nair A, Seshadri MS, Rajaratnam S. Mutational analysis of RET proto-oncogene among patients with medullary thyroid carcinoma and 'at risk' carriers from India. Clin Endocrinol (Oxf) 2011; 75:571-2. [PMID: 21521337 DOI: 10.1111/j.1365-2265.2011.04069.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Boaz RJ, Ramakant P, Ebenazer A, Pai R, Rajaratnam S, Abraham D, Paul MJ. Role of cortical sparing adrenalectomy and novel variant of mutation in patient with von Hippel-Lindau disease. Indian J Endocrinol Metab 2011; 15 Suppl 4:S402-S405. [PMID: 22145147 PMCID: PMC3230085 DOI: 10.4103/2230-8210.86987] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Neurofibromatosis type 1 is the most common phakomatoses and is inherited in autosomal dominant fashion with complete penetrance. Secondary hypertension is common in these patients due to various causes including adrenal tumors. Pheochromocytoma is a rare catecholamine producing tumor seen in 0.5% to 5% of patients with neurofibromatosis. The combination of pheochromocytoma with neurofibromatosis is rarely reported in the literature. We recently encountered an elderly lady with this combination who successfully underwent adrenalectomy. We report the case for the uncommon occurrence and to highlight the relevant literature review about pheochromocytoma in neurofibromatosis.
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Affiliation(s)
- Ranil Johann Boaz
- Department of General Surgery, Christian Medical College, Vellore, Tamil Nadu, India
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31
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Tomaino JL, Jameson AD, Kevek JW, Paul MJ, van der Zande AM, Barton RA, McEuen PL, Minot ED, Lee YS. Terahertz imaging and spectroscopy of large-area single-layer graphene. Opt Express 2011; 19:141-146. [PMID: 21263550 DOI: 10.1364/oe.19.000141] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We demonstrate terahertz (THz) imaging and spectroscopy of a 15 × 15-mm2 single-layer graphene film on Si using broadband THz pulses. The THz images clearly map out the THz carrier dynamics of the graphene-on-Si sample, allowing us to measure sheet conductivity with sub-mm resolution without fabricating electrodes. The THz carrier dynamics are dominated by intraband transitions and the THz-induced electron motion is characterized by a flat spectral response. A theoretical analysis based on the Fresnel coefficients for a metallic thin film shows that the local sheet conductivity varies across the sample from σ(s) = 1.7 × 10(-3) to 2.4 × 10(-3) Ω(-1) (sheet resistance, ρ(s) = 420 - 590 Ω/sq).
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Affiliation(s)
- J L Tomaino
- Department of Physics, Oregon State University, Corvallis, Oregon 97331, USA
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32
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Paul MJ, Pyter LM, Freeman DA, Galang J, Prendergast BJ. Photic and nonphotic seasonal cues differentially engage hypothalamic kisspeptin and RFamide-related peptide mRNA expression in Siberian hamsters. J Neuroendocrinol 2009; 21:1007-14. [PMID: 19840238 PMCID: PMC2789174 DOI: 10.1111/j.1365-2826.2009.01924.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Seasonally breeding animals use a combination of photic (i.e. day length) and nonphotic (e.g. food availability, temperature) cues to regulate their reproduction. How these environmental cues are integrated is not understood. To assess the potential role of two candidate neuropeptides, kisspeptin and RFamide-related peptide-3 (RFRP), we monitored regional changes in their gene expression in a seasonally breeding mammal exposed to moderate changes in photoperiod and food availability. Adult male Siberian hamsters (Phodopus sungorus) were housed under a long (16 h light/day; 16 L) or intermediate (13.5 L) photoperiod and fed ad lib. or a progressive food restriction schedule (FR; reduced to 80% of ad lib.) for 11 weeks. Gonadal regression occurred only in FR hamsters housed under 13.5 L. Immunohistochemistry was used to identify diencephalic populations of kisspeptin- and RFRP-immunoreactive cells, and quantitative PCR was used to measure gene expression in adjacent coronal brain sections. Photoperiod, but not food availability, altered RFRP mRNA expression in the dorsomedial sections, whereas food availability but not photoperiod altered Kiss1 expression in the arcuate sections; intermediate photoperiods elevated RFRP expression, and food restriction suppressed Kiss1 expression. Regional- and neuropeptide-specific activity of RFamides may provide a mechanism for integration of multi-modal environmental information in the seasonal control of reproduction.
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Affiliation(s)
- M J Paul
- Department of Neurology, University of Massachusetts Medical School, Worcester, MA 01655, USA.
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Mir KA, Pugazhendhi S, Paul MJ, Nair A, Ramakrishna BS. Heat-shock protein 70 gene polymorphism is associated with the severity of diabetic foot ulcer and the outcome of surgical treatment. Br J Surg 2009; 96:1205-9. [DOI: 10.1002/bjs.6689] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Abstract
Background
Foot ulcer is a significant cause of morbidity in diabetics. Genetic make-up can determine inflammatory and healing responses. This study examined the hypothesis that specific polymorphisms of the heat-shock protein 70 gene could predispose to the severity of diabetic foot ulceration.
Methods
Some 106 consecutive diabetic patients (101 evaluable) with foot ulceration admitted to a tertiary care hospital were managed according to a standard protocol. DNA was extracted from venous blood and examined by polymerase chain reaction–restriction fragment length analysis for two specific polymorphisms: G1538A in the HSPA1B and C2437T in the HSPA1L gene.
Results
HSPA1B genotyping showed that 70 patients were AG and 30 GG (one not amplified). The AG genotype was significantly associated with the severity of foot ulceration (Wagner grade) (P = 0·008, χ2 test), need for amputation (relative risk 2·02, 95 per cent confidence interval 1·02 to 4·01; P = 0·025) and median length of hospital stay (8 versus 5 days for GG; P = 0·043). HSPA1L genotypes (78 TT, 22 CT, one CC) did not show any significant association with these parameters.
Conclusion
The HSPA1B genotype, was associated with the severity of diabetic foot ulceration, need for amputation and duration of hospitalization in these patients.
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Affiliation(s)
- K A Mir
- Department of Surgical Endocrinology, Christian Medical College, Vellore, India
| | - S Pugazhendhi
- Wellcome Trust Research Laboratory, Christian Medical College, Vellore, India
| | - M J Paul
- Department of Surgical Endocrinology, Christian Medical College, Vellore, India
| | - A Nair
- Department of Surgical Endocrinology, Christian Medical College, Vellore, India
| | - B S Ramakrishna
- Wellcome Trust Research Laboratory, Christian Medical College, Vellore, India
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Jebasingh KF, Koshy TG, Paul TV, Paul MJ, Abraham D, Viswabandya A. Pheochromocytoma and haemophilia: an unusual combination. Singapore Med J 2009; 50:e71-e73. [PMID: 19296016] [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: 05/27/2023]
Abstract
We report pheochromocytoma and haemophilia occurring in a 19-year-old South Indian man. To the best of our knowledge, this case is the first of its kind to be reported in the medical literature. The patient had bilateral adrenal pheochromocytomas with an extradrenal pheochromocytoma on the left side, and was successfully operated on after optimal preoperative blood pressure control and factor VIII support.
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Affiliation(s)
- K F Jebasingh
- Department of Endocrinology, Christian Medical College, Vellore 632004, Tamil Nadu, India.
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35
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Rajinikanth J, Paul MJ, Abraham DT, Ben Selvan CK, Nair A. Surgical audit of inadvertent parathyroidectomy during total thyroidectomy: incidence, risk factors, and outcome. Medscape J Med 2009; 11:29. [PMID: 19295950 PMCID: PMC2654678] [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: 05/27/2023]
Affiliation(s)
- J Rajinikanth
- Department of General Surgery and Endocrine Surgery, Christian Medical College and Hospital, Tamilnadu, India.
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36
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Abstract
Social regulation of animal circadian rhythms may enable individuals in a population to temporally synchronize or segregate their activities within the community. Relatively little is known about the mechanisms for such interindividual temporal adaptations or how the circadian system might be involved. The literature suggests that actual prolonged cohabitation might lead to robust effects on the rhythmicity of cohoused individuals but that these effects are not easily reproduced by indirect or pulsatile social contacts. We have begun to study the conditions under which such cohabitation effects might be revealed in the laboratory, and we present and discuss initial data that cohousing pairs of golden hamsters can result in a persistent change in the free-running circadian period of one of the two hamsters of the pair. We believe that analyzing the societal level of temporal organization, and ultimately dissecting its underlying mechanisms, will enrich our understanding of the circadian clock and its role in establishing ecological communities.
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Affiliation(s)
- M J Paul
- Department of Neurology, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA
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Abstract
Considerable effort has been expended on understanding the genetic networks that regulate leaf development and morphology, however, less attention has been given to the role of leaf carbon status in modulating the plant developmental programme. Unexpected changes in plant development have been observed in response to changes in leaf metabolism. The focus of this review will be to discuss how manipulation of leaf carbon metabolic pathways, such as the photosynthetic carbon reduction cycle and trehalose biosynthesis, has provided insights into links between metabolism and development.
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Affiliation(s)
- C A Raines
- Department of Biological Sciences, University of Essex, Colchester, UK.
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38
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Paul MJ, Summers Y, Calvert AH, Rustin G, Brampton MH, Thatcher N, Middleton MR. Effect of temozolomide on central nervous system relapse in patients with advanced melanoma. Melanoma Res 2002; 12:175-8. [PMID: 11930115 DOI: 10.1097/00008390-200204000-00011] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.8] [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: 11/26/2022]
Abstract
Temozolomide has shown efficacy in the treatment of metastatic melanoma similar to that of dacarbazine (DTIC), the standard chemotherapy, but with the added benefit of penetration into the central nervous system (CNS). Isolated CNS relapse is increasingly a problem for patients who respond to biochemotherapy. By replacing DTIC with temozolomide in treatment regimens, the incidence of CNS relapse might be reduced. This hypothesis is difficult to test in a prospective randomized controlled trial because of the large number of patients that would be required. We have examined this question in a retrospective case control study, observing the rates of CNS relapse in advanced metastatic melanoma patients responding to DTIC- or temozolomide-based chemotherapy in three institutions. Twenty-one DTIC and 20 temozolomide responders were identified, and have been followed up for a median of 19.0 months (range 6.0-74.3 months). CNS relapse occurred in nine DTIC- and two temozolomide-treated patients, a statistically significant difference in favour of the new agent (P = 0.03). These results support the investigation of temozolomide as a replacement for DTIC in systemic treatment regimens for melanoma.
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Affiliation(s)
- M J Paul
- Cancer Research UK Department of Medical Oncology, Christie Hospital NHS Trust, Manchester, UK
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Abstract
The concept that photosynthetic flux is influenced by the accumulation of photo-assimilate persisted for 100 years before receiving any strong experimental support. Precise analysis of the mechanisms of photosynthetic responses to sink activity required the development of a battery of appropriate molecular techniques and has benefited from contemporary interest in the effects of elevated CO2 on photosynthesis. Photosynthesis is one of the most highly integrated and regulated metabolic processes to maximize the use of available light, to minimize the damaging effects of excess light and to optimize the use of limiting carbon and nitrogen resources. Hypotheses of feedback regulation must take account of this integration. In the short term, departure from homeostasis can lead to redox signals, which cause rapid changes in the transcription of genes encoding photosystems I and II. End-product synthesis can exert short-term metabolic feedback control through Pi recycling. Beyond this, carbohydrate accumulation in leaves when there is an imbalance between source and sink at the whole plant level can lead to decreased expression of photosynthetic genes and accelerated leaf senescence. In a high CO2 world this may become a more prevalent feature of photosynthetic regulation. However, sink regulation of photosynthesis is highly dependent on the physiology of the rest of the plant. This physiological state regulates photosynthesis through signal transduction pathways that co-ordinate the plant carbon : nitrogen balance, which match photosynthetic capacity to growth and storage capacity and underpin and can override the direct short-term controls of photosynthesis by light and CO2. Photosynthate supply and phytohormones, particularly cytokinins, interact with nitrogen supply to control the expression of photosynthesis genes, the development of leaves and the whole plant nitrogen distribution, which provides the dominant basis for sink regulation of photosynthesis.
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Affiliation(s)
- M J Paul
- Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK.
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40
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Abstract
The role of the demand for carbon assimilates (the 'sink') in regulating photosynthetic carbon assimilation (Pn: the 'source') in response to phosphate (P(i)) deficiency was examined in tobacco (Nicotiana tabacum L.). P(i) supply was maintained or withdrawn from plants, and in both treatments the source/sink ratio was decreased in some plants by darkening all but two source leaves (partially darkened plants). The remaining plants were kept fully illuminated. P(i)-sufficient plants showed little variation in rate of Pn, amounts of P(i) or phosphorylated intermediates. Withdrawal of P(i) decreased Pn by 75% under the growing conditions and at both low and high internal CO2 concentration. Concomitantly, P(i), phosphorylated intermediates and ATP contents decreased and starch increased. RuBP and activity of phosphoribulokinase closely matched the changes in Pn, but Rubisco activity remained high. Partial darkening P(i)-deficient plants delayed the loss of photosynthetic activity; Rubisco and phosphoribulokinase activities and amounts of sucrose and metabolites, particularly RuBP and G6P, were higher than in fully illuminated Pi-deficient plants. Rates of sucrose export from leaves were more than 2-fold greater than in fully illuminated P(i)-deficient plants. Greater sucrose synthesis, facilitated by increased G6P content, an activator of SPS, would recycle P(i) from the cytosol back to the chloroplast, maintaining ATP, RuBP and hence Pn. It is concluded that low sink strength imposes the primary limitation on photosynthesis in P(i)-deficient plants which restricts sucrose export and sucrose synthesis imposing an end-product synthesis limitation of photosynthesis.
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Affiliation(s)
- A J Pieters
- Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ, UK
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Paul MJ, Driscoll SP, Andralojc PJ, Knight JS, Gray JC, Lawlor DW. Decrease of phosphoribulokinase activity by antisense RNA in transgenic tobacco: definition of the light environment under which phosphoribulokinase is not in large excess. Planta 2000; 211:112-9. [PMID: 10923711 DOI: 10.1007/s004250000269] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
To test the hypothesis that the contribution of phosphoribulokinase (PRK) to the control of photosynthesis changes depending on the light environment of the plant, the response of transgenic tobacco (Nicotiana tabacum L.) transformed with antisense PRK constructs to irradiance was determined. In plants grown under low irradiance (330 micromol m(-2) s(-1)) steady-state photosynthesis was limited in plants with decreased PRK activity upon exposure to higher irradiance, with a control coefficient of PRK for CO2 assimilation of 0.25 at and above 800 micromol m(-2) s(-1). The flux control coefficient of PRK for steady-state CO2 assimilation was zero, however, at all irradiances in plant material grown at 800 micromol m(-2) s(-1) and in plants grown in a glasshouse during mid-summer (alternating shade and sun 300-1600 micromol m(-2) s(-1)). To explain these differences between plants grown under low and high irradiances, Calvin cycle enzyme activities and metabolite content were determined. Activities of PRK and other non-equilibrium Calvin cycle enzymes fructose-1,6-bisphosphatase, sedoheptulose-1,7-bisphosphatase and ribulose-1,5-bisphosphate carboxylase-oxygenase were twofold higher in plants grown at 800 micromol m(-2) s(-1) or in the glasshouse than in plants grown at 330 micromol m(-2) s(-1). Activities of equilibrium enzymes transketolase, aldolase, ribulose-5-phosphate epimerase and isomerase were very similar under all growth irradiances. The flux control coefficient of 0.25 in plants grown at 330 micromol m(-2) s(-1) can be explained because low ribulose-5-phosphate content in combination with low PRK activity limits the synthesis of ribulose-1,5-bisphosphate. This limitation is overcome in high-light-grown plants because of the large relative increase in activities of sedoheptulose-1,7-bisphosphatase and fructose-1,6-bisphosphatase under these conditions, which facilitates the synthesis of larger amounts of ribulose-5-phosphate. This potential limitation will have maintained evolutionary selection pressure for high concentrations of PRK within the chloroplast.
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Affiliation(s)
- M J Paul
- Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Hertfordshire, UK
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Banks FM, Driscoll SP, Parry MA, Lawlor DW, Knight JS, Gray JC, Paul MJ. Decrease in phosphoribulokinase activity by antisense RNA in transgenic tobacco. Relationship between photosynthesis, growth, and allocation at different nitrogen levels. Plant Physiol 1999; 119:1125-36. [PMID: 10069852 PMCID: PMC32095 DOI: 10.1104/pp.119.3.1125] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/1998] [Accepted: 12/12/1998] [Indexed: 05/21/2023]
Abstract
To study the direct effects of photosynthesis on allocation of biomass by altering photosynthesis without altering leaf N or nitrate content, phosphoribulokinase (PRK) activity was decreased in transgenic tobacco (Nicotiana tabacum L.) with an inverted tobacco PRK cDNA and plants were grown at different N levels (0.4 and 5 mM NH4NO3). The activation state of PRK increased as the amount of enzyme was decreased genetically at both levels of N. At high N a 94% decrease in PRK activity had only a small effect (20%) on photosynthesis and growth. At low N a 94% decrease in PRK activity had a greater effect on leaf photosynthesis (decreased by up to 50%) and whole-plant photosynthesis (decreased by up to 35%) than at high N. These plants were up to 35% smaller than plants with higher PRK activities because they had less structural dry matter and less starch, which was decreased by 3- to 4-fold, but still accumulated to 24% to 31% of dry weight; young leaves contained more starch than older leaves in older plants. Leaves had a higher ion and water content, and specific leaf area was higher, but allocation between shoot and root was unaltered. In conclusion, low N in addition to a 94% decrease in PRK by antisense reduces the activity of PRK sufficient to diminish photosynthesis, which limits biomass production under conditions normally considered sink limited.
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Affiliation(s)
- FM Banks
- Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ, United Kingdom (F.M.B., S.P.D., M.A.J.P., D.W. L., M.J.P.)
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Habash DZ, Parry MA, Parmar S, Paul MJ, Driscoll S, Knight J, Gray JC, Lawlor DW. The regulation of component processes of photosynthesis in transgenic tobacco with decreased phosphoribulokinase activity. Photosynth Res 1996; 49:159-167. [PMID: 24271613 DOI: 10.1007/bf00117666] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/1996] [Accepted: 07/11/1996] [Indexed: 06/02/2023]
Abstract
Tobacco plants (Nicotiana tabacum L.) transformed with an inverted cDNA encoding ribulose 5-phosphate kinase (phosphoribulokinase,PRK; EC 2.7.1.19) were employed to study the in vivo relationship between photosynthetic electron transport and the partitioning of electron transport products to major carbon metabolism sinks under conditions of elevated ATP concentrations and limited ribulose 1,5-bisphosphate (RuBP) regeneration. Simultaneous measurements of room temperature chlorophyll fluorescence and CO2 gas exchange were conducted on intact leaves. Under ambient CO2 concentrations and light intensities above those at which the plants were grown, transformants with only 5% of PRK activity showed 'down-regulation" of PS II activity and electron transport in response to a decrease in net carbon assimilation when compared to wild-type. This was manifested as a decline in the efficiency of PS II electron transport (ΦPS II), an increase in dissipation of excess absorbed light in the antennae of PS II and a decline in: total linear electron transport (J1), electron transport dedicated to carbon assimilation (JA) and electron transport allocated to photorespiration (JL). The transformants showed no alteration in the Rubisco specificity factor measured in vitro and calculated in vivo but had a relatively smaller ratio of RuBP oxygenation to carboxylation rates (vo/vc), due to a higher CO2 concentration at the carboxylation site (Cc). The relationship between ΦPS II and ΦCO 2was similar in transformants and wild-type under photorespiratory conditions demonstrating no change in the intrinsic relationship between PS II function and carbon assimilation, however, a novel result of this study is that this similar relationship occurred at different values of quantum flux, J1, JA, JL and vo/vc in the transformant. For both wild-type and transformants, an assessment was made of the possible presence of a third major sink for electron transport products, beside RuBP oxygenation and carboxylation, the data provided no evidence for such a sink.
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Affiliation(s)
- D Z Habash
- Biochemistry and Physiology Department, IACR-Rothamsted, AL5 2JQ, Harpenden, Hertfordshire, UK
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Abstract
The use of home uterine activity monitoring for patients at high risk for preterm labor and delivery has become common in clinical perinatology. The ability of the monitoring devices to detect accurately uterine contractions in early pregnancy has not previously been reported. Ten women in labor between 20 and 35 weeks' gestation underwent simultaneous monitoring of uterine activity with a guard-ring tocodynamometer and an intrauterine pressure monitor. When compared with internal monitoring, the external monitor detected 90.8% of uterine contractions with a specificity for uterine quiescence of 98.1%. The predictive value of external monitoring was 97.3% for detecting uterine contractions and 93.6% for recording the absence of uterine contractions. The contractions detected externally were similar in duration: mean 63.7 +/- 23.0 seconds for internal monitoring and 62.2 +/- 22.6 seconds for external monitoring (p greater than 0.05). The intensity of contractions detected externally was less than internally measured contractions, mean difference, 19.7 +/- 15.9 mmHg (p less than 0.001). External tocodynamometry using this guarding tocodynamometer reliably distinguishes between uterine contractions and uterine quiescence in preterm pregnancies but does not adequately measure the intensity of contractions.
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Affiliation(s)
- M J Paul
- Department of Obstetrics & Gynecology, Washington University School of Medicine, St. Louis, Missouri
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45
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Abstract
Plants of Mesembryanthemum crystallinum L. were grown from seed in phosphate-sufficient and phosphate-deficient conditions. Separate plants were subjected to nitrate deficiency by removing nitrate from the rooting medium of previously nitrate-sufficient plants. Subsequently, they were also irrigated with 400 mM NaCl to induce CAM. Plants of M. crystallinum with induced CAM that had been grown in complete nutrient medium were deinduced by rehydration. Nitrate and phosphate deficiencies caused enhanced CAM activity prior to salt treatments. After salinisation, phosphate deficiency also caused higher background levels of malate. Prolonged nitrate deficiency reduced CAM activity. Endogenous P1 levels in phosphate-sufficient plants correlated with CAM activity. However in phosphate-deficient plants CAM occurred without a significant rise in P1 content. Levels of endogenous P1 appeared more related to nitrate deficiency than to CAM or salt treatment. Nitrate and phosphate deficiencies and salt treatment could all cause a nitrate deficiency within the leaf, causing high endogenous P1 when available in the rooting medium. It is speculated that a change in nitrogen status could play a role in the initiation of CAM induction in M. crystallinum. A further possibility is that CAM could be induced by reduced water potential due to dehydration and increased ion content in saline conditions, and by an inhibition of growth and concomitant accumulation of solutes in phosphate- and nitrate-deficient conditions.
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Affiliation(s)
- M J Paul
- Department of Botany, University of Leicester, Leicester LEI 7RH, England
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- Department of Botany, University of Leicester, Leicester LEI 7RH, England
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Abstract
1. Two Ca-ATPases in the gill microsomal fraction from the killifish (Fundulus heteroclitus) have been characterized. 2. A (Ca2+ + Mg2+)-ATPase which has a high affinity for Ca2+, requires Mg2+ for activity and may be stimulated by calmodulin. 3. A (Ca2+ + Na+)-ATPase which has a low affinity for Ca2+ requires Na+ for activity, does not require Mg2+ and is probably not stimulated by calmodulin. 4. These enzymes may play a physiological role in killifish calcium regulation.
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Affiliation(s)
- M J Paul
- Physiology Department, Tulane Medical School, New Orleans, Louisiana 70112
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Paul MJ. Role of nurse in a leprosy hospital. Nurs J India 1985; 76:150. [PMID: 3850561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Paul MJ. Care of hand and feet in leprosy. Nurs J India 1983; 74:93. [PMID: 6136025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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