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Nader M, Herrmann K, Kunkel F, Zarrad F, Pacelli A, Fendler W, Koplin S. Improved production of 68Ga-Pentixafor using cartridge mediated cation exchange purification. Appl Radiat Isot 2022; 189:110447. [DOI: 10.1016/j.apradiso.2022.110447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 08/24/2022] [Accepted: 08/29/2022] [Indexed: 11/02/2022]
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Abdelhamid AM, Youssef ME, Cavalu S, Mostafa-Hedeab G, Youssef A, Elazab ST, Ibrahim S, Allam S, Elgharabawy RM, El-Ahwany E, Amin NA, Shata A, Mohammed OA, Ibrahim Abdeldaiem MS, Alhowail A, El-Saber Batiha G, El-Mahmoudy EA, Attia M, Allam A, Zaater MY, Osman MM, Nader M, Taha A, Makarem NA, Saber S. Carbocisteine as a Modulator of Nrf2/HO-1 and NFκB Interplay in Rats: New Inspiration for the Revival of an Old Drug for Treating Ulcerative Colitis. Front Pharmacol 2022; 13:887233. [PMID: 35754464 PMCID: PMC9214041 DOI: 10.3389/fphar.2022.887233] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 05/18/2022] [Indexed: 12/29/2022] Open
Abstract
Ulcerative colitis (UC), an inflammatory bowel disease, is a chronic condition of a multifaceted pathophysiology. The incidence of UC is increasing internationally. The current therapies for UC lack relative effectiveness and are associated with adverse effects. Therefore, novel therapeutic options should be developed. It has been well documented that modulating the Nrf2/NFκB is a promising therapeutic target in inflammation. Carbocisteine is a mucoregulatory medication and its efficacy in COPD was found to be more closely related to its antioxidant and anti-inflammatory properties. Carbocisteine has not yet been examined for the management of UC. Hence, our approach was to investigate the potential coloprotective role of carbocisteine in acetic acid-induced colitis in rats. Our results revealed that carbocisteine improved colon histology and macroscopic features and subdued the disease activity as well. Additionally, carbocisteine attenuated colon shortening and augmented colon antioxidant defense mechanisms via upregulating catalase and HO-1 enzymes. The myeloperoxidase activity was suppressed indicating inhibition of the neutrophil infiltration and activation. Consistent with these findings, carbocisteine boosted Nrf2 expression along with NFκB inactivation. Consequently, carbocisteine downregulated the proinflammatory cytokines IL-6 and TNF-α and upregulated the anti-inflammatory cytokine IL-10. Concomitant to these protective roles, carbocisteine displayed anti-apoptotic properties as revealed by the reduction in the Bax: BCL-2 ratio. In conclusion, carbocisteine inhibited oxidative stress, inflammatory response, and apoptosis in acetic acid-induced UC by modulating the Nrf2/HO-1 and NFκB interplay in rats. Therefore, the current study provides a potential basis for repurposing a safe and a commonly used mucoregulator for the treatment of UC.
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Affiliation(s)
- Amir Mohamed Abdelhamid
- Department of Pharmacology, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Mahmoud E Youssef
- Department of Pharmacology, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Simona Cavalu
- Faculty of Medicine and Pharmacy, University of Oradea, Oradea, Romania
| | - Gomaa Mostafa-Hedeab
- Pharmacology Department and Health Research Unit, Medical College, Jouf University, Sakakah, Saudi Arabia.,Pharmacology Department, Faculty of Medicine, Beni-Suef University, Beni Suef, Egypt
| | - Amal Youssef
- Medical Pharmacology Department, Faculty of Medicine, Cairo University, Giza, Egypt
| | - Sara T Elazab
- Department of Pharmacology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Samar Ibrahim
- Department of Pharmacy Practice, Faculty of Pharmacy, Ahram Canadian University, Giza, Egypt
| | - Shady Allam
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Menoufia University, Menoufia, Egypt
| | | | - Eman El-Ahwany
- Department of Immunology, Theodor Bilharz Research Institute, Giza, Egypt
| | - Noha A Amin
- Department of Haematology, Theodor Bilharz Research Institute, Giza, Egypt
| | - Ahmed Shata
- Department of Clinical Pharmacology, Faculty of Medicine, Mansoura University, Mansoura, Egypt.,Department of Clinical Pharmacy, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Osama A Mohammed
- Department of Clinical Pharmacology, Faculty of Medicine, Ain Shams University, Cairo, Egypt.,Department of Clinical Pharmacology, Faculty of Medicine, Bisha University, Bisha, Saudi Arabia
| | - Mahmoud Said Ibrahim Abdeldaiem
- Clinical Pharmacy Department, School of Pharmaceutical Sciences, Universiti Sains Malaysia, George Town, Malaysia.,Pharmacy Practice Department, Faculty of Pharmacy, Sinai University, Ismailia, Egypt
| | - Ahmed Alhowail
- Department of Pharmacology and Toxicology, College of Pharmacy, Qassim University, Buraidah, Saudi Arabia
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
| | - Engy A El-Mahmoudy
- Department of Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Maram Attia
- Department of Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Alaa Allam
- Department of Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Mona Y Zaater
- Department of Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Mona M Osman
- Department of Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Manar Nader
- Department of Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Aya Taha
- Department of Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Nada Abul Makarem
- Department of Biochemistry, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
| | - Sameh Saber
- Department of Pharmacology, Faculty of Pharmacy, Delta University for Science and Technology, Gamasa, Egypt
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Nader M, Valla D, Vriamont C, Masset J, Pacelli A, Herrmann K, Zarrad F. [68Ga]/[90Y]FAPI-46: Automated production and analytical validation of a theranostic pair. Nucl Med Biol 2022; 110-111:37-44. [DOI: 10.1016/j.nucmedbio.2022.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 04/03/2022] [Accepted: 04/21/2022] [Indexed: 11/26/2022]
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Connolly K, Fitzgerald B, Nader M, Joshi N. A31 A Reservoir of Tumor-Specific CD8 T Cells in Lung Cancer Resides in the Draining Lymph Node. J Thorac Oncol 2020. [DOI: 10.1016/j.jtho.2019.12.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Alsolme E, Alotaibi S, Bakheet D, Nader M. P2822SLMAP expression is altered during cardiac remodeling and it regulates cardiomyocyte response to adrenergic stimuli. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2822] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- E Alsolme
- Alfaisal University, Physiological Sciences, Riyadh, Saudi Arabia
| | - S Alotaibi
- Alfaisal University, Physiological Sciences, Riyadh, Saudi Arabia
| | - D Bakheet
- King Faisal Specialist Hospital & Research Centre, Genetics, Riyadh, Saudi Arabia
| | - M Nader
- Alfaisal University, Physiological Sciences, Riyadh, Saudi Arabia
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Nader M, Alotaibi S, Alsomale E, Bakheet D, Dzimiri N. P3495Striatin regulates the dynamics of the Caveolin-3/Calmodulin complex and modulates cardiomyocyte spontaneous contraction rate. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p3495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Noureldine MHA, Harifi G, Berjawi A, Haydar AA, Nader M, Elnawar R, Sweid A, Al Saleh J, Khamashta MA, Uthman I. Hughes syndrome and epilepsy: when to test for antiphospholipid antibodies? Lupus 2016; 25:1397-1411. [DOI: 10.1177/0961203316651747] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Epilepsy and seizures are reported among the neurological manifestations of antiphospholipid syndrome (APS) at a prevalence rate of approximately 8%, which is nearly 10 times the prevalence of epilepsy in the general population. The association of seizures with antiphospholipid antibodies (aPL) is even more significant in the presence of systemic lupus erythematosus (SLE). In this review, we discuss the epidemiological, pathophysiological, laboratory, clinical, and radiological aspects of this association, and derive suggestions on when to consider testing for aPL in epileptic patients and how to manage seizures secondary to APS based on literature data. Epilepsy due to APS should be considered in young patients presenting with seizures of unknown origin. Temporal lobe epilepsy seems to be particularly prevalent in APS patients. The pathogenesis is complex and may not only involve micro-thrombosis, but also a possible immune-mediated neuronal damage. Patients with seizures and positive aPL tend to develop thrombocytopenia and livedo racemosa more frequently compared with those without aPL. Magnetic resonance imaging (MRI) remains the imaging modality of choice in these patients. The presence of SLE and the presence of neurological symptoms significantly correlate with the presence of white matter changes on MRI. In contrast, the correlation between aPL positivity and the presence of white matter changes is very weak. Furthermore, MRI can be normal in more than 30–40% of neuropsychiatric lupus patients with or without aPL. aPL testing is recommended in young patients presenting with atypical seizures and multiple hyper-intensity lesions on brain MRI in the absence of other possible conditions. New MRI techniques can better understand the pathology of brain damage in neuro-APS. The therapeutic management of epileptic APS patients relies on anti-epileptic treatment and anticoagulant agents when there is evidence of a thrombotic event. In the absence of consensual recommendations, the decision of lifelong anticoagulation is discussed on a case-by-case basis. The anti-thrombotic benefit of hydroxychloroquine and statins is supported by several studies.
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Affiliation(s)
- M H A Noureldine
- Gilbert and Rose-Marie Chagoury School of Medicine, Lebanese American University Medical Center, Beirut, Lebanon
| | - G Harifi
- Department of Rheumatology, Dubai Hospital, Dubai, UAE
| | - A Berjawi
- Gilbert and Rose-Marie Chagoury School of Medicine, Lebanese American University Medical Center, Beirut, Lebanon
| | - A A Haydar
- Gilbert and Rose-Marie Chagoury School of Medicine, Lebanese American University Medical Center, Beirut, Lebanon
| | - M Nader
- Department of Neurology, Lebanese American University Medical Center, Beirut, Lebanon
| | - R Elnawar
- Département de Neurologie, Université Paris Diderot, Paris, France
| | - A Sweid
- Department of Neurosurgery, Lebanese American University Medical Center, Beirut, Lebanon
| | - J Al Saleh
- Department of Rheumatology, Dubai Hospital, Dubai, UAE
| | - M A Khamashta
- Department of Rheumatology, Dubai Hospital, Dubai, UAE
- Division of Women’s Health, St Thomas’s Hospital, London, UK
| | - I Uthman
- Division of Rheumatology, American University of Beirut, Beirut, Lebanon
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Noureldine M, Harifi G, Haydar A, Berjawi A, Nader M, Elnawar R, Sweid A, Al Saleh J, Khamashta M, Uthman I. AB0487 Antiphospholipid Syndrome and Epilepsy: Where Do We Stand? Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.1521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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González Toledo E, Nader M, Thomas-Ogunniyi J, Wilson J. Anaplastic ganglioglioma of the brainstem in an adult. Neuroradiol J 2012; 25:325-9. [PMID: 24028985 DOI: 10.1177/197140091202500307] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2012] [Accepted: 03/26/2012] [Indexed: 11/16/2022] Open
Abstract
Gangliogliomas are neoplasms with neuronal and glial components. The most common location is the temporal lobe and for that reason those patients have seizures as the major complaint. Gangliogliomas with anaplastic features are uncommon. A 33-year-old man presented with a two-year history of progressively worsening right-sided weakness and contractures. Physical examination demonstrated right-sided weakness and contractures involving the upper and lower extremities. Magnetic resonance demonstrated multiple nodules involving the tegmental pons with a small projection into the prepontine cistern on the left, midbrain tegmentum on the left in the subthalamic region. The patient was studied by MRI on T1WI, T2WI, FLAIR, DWI, and magnetic resonance spectroscopy. He underwent a craniotomy and biopsy of the mass. Histological examination of the specimen revealed glial proliferation. Based on these findings the pathologic diagnosis was anaplastic ganglioglioma. Only one previous report of an anaplastic astrocytoma in the cerebello-pontine angle in an adult has been published. In children three cases were reported, only one with magnetic resonance. Our case showed multiple nodular structures hypointense on T1 and hyperintense on T2 and FLAIR with enhancement on T1 after injection of paramagnetic contrast. Only in this contribution T2 value were diffusion-weighted and ADC characteristics and (1)H spectroscopy analyzed.
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Affiliation(s)
- E González Toledo
- Department of Radiology, Louisiana State University Health Sciences Center; Shreveport, LA, USA -
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Krasikova RN, Fedorova OS, Zaitsev VV, Mosevich IK, Kuznetsova OF, Westera G, Ametamey SM, Schubiger PA, Nader M. A comparative study of the nickel complex of the schiff base of (S)-o-N-[(N'- benzylprolyl)amino]benzophenone and glycine (Ni-BPB-Gly) and its analogue with the chlorine substituted N-benzyl group (Ni-CPB-Gly) in the asymmetric synthesis of 6-[18F]-fluoro. J Labelled Comp Radiopharm 2012. [DOI: 10.1002/jlcr.2580440150] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Gonzalez-Toledo E, Santos Andrade C, Da Costa Leite C, Del Carpio-O'Donovan R, Fayed N, Morales H, Peterson R, Palacios E, Previgliano CH, Rocha AJ, Romero JM, Rugilo C, Staut CCV, Tamer I, Tavares Lucato L, Nader M. An Atlas of Infectious and Parasitic Diseases of the Central Nervous System. A Cooperative Study of SILAN (Sociedad Iberolatinoamericana de Neurorradiologia). Neuroradiol J 2010; 23:554-73. [PMID: 24148677 DOI: 10.1177/197140091002300505] [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] [Received: 09/01/2010] [Accepted: 09/04/2010] [Indexed: 11/17/2022] Open
Abstract
Infectious diseases of the central nervous system vary in frequency in different locations in America and Europe. What is common in Brazil can be a sporadic presentation in Europe. Cooperative work gathering experiences from neuroradiologists working in various places can be achieved and will help to identify uncommon cases that can present in our daily practice.
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Affiliation(s)
- E Gonzalez-Toledo
- Department of Radiology, Louisiana State University Health Sciences Center; Shreveport; USA -
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Baz Z, Nader M, Zaitoun F, Dana R, Irani C, Hejjaoui A, Kairallah E, Salloum BA, Dib Antoun SA, Chreiteh S, Maatouk H, Andary B. Analysis of Airborne Pollen in Lebanon. J Allergy Clin Immunol 2010. [DOI: 10.1016/j.jaci.2009.12.090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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Guenneau F, Nader M, Salamé P, Launay F, Semmer-Herledan V, Gédéon A. Probing the pore space in mesoporous materials by laser enhanced hyperpolarised 129Xe NMR. Catal Today 2006. [DOI: 10.1016/j.cattod.2005.11.069] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
We report four cases of central neurocytoma we operated on at our institution, between 1994 and 2002. This uncommon lesion occurred in young patients, was located in the lateral ventricules and was revealed by signs of intracranial hypertension. The tumor was totally removed in three cases and subtotally in one. Immunohistochemistry provided useful information to distinguish neurocytoma from other nervous system tumors. Prognosis was excellent in two patients. One patient developed tumor recurrence seven years after surgery, without any progression on further follow up evaluation. In the last patient, the tumor showed a more aggressive progression requiring the adjunction of radiosurgery.
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Affiliation(s)
- R Moussa
- Service de Neurochirurgie, Hôpital Hôtel-Dieu de France, Beyrouth, Liban.
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Hanna J, Chahine R, Aftimos G, Nader M, Mounayar A, Esseily F, Chamat S. Protective effect of taurine against free radicals damage in the rat myocardium. ACTA ACUST UNITED AC 2004; 56:189-94. [PMID: 15625788 DOI: 10.1016/j.etp.2004.08.004] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Free radicals are highly cytotoxic to the heart and are involved in ischemia/reperfusion injury. In this study, we tested the ability of taurine to neutralize the deleterious effects of free radicals generated ex vivo and in vitro. Taurine was added at a concentration of 0.1 mM to the drinking water of experimental rats during 6 months. The animal hearts were then isolated and submitted to regional ischemia and reperfusion; ventricular fibrillation was significantly reduced as compared to a control group of non-treated animals. Moreover, at a concentration of 1 mM, taurine provided significant cardio-protection against the deleterious effect of free radicals generated by the electrolysis of Krebs-Henseleit buffer. When isolated hearts were perfused with electrolysed buffer, extensive fiber necrosis occurred, as observed by staining with nitro blue tertrazolium, a soluble dye which yields a dark blue formazan stain in the presence of reducing agents This stain was barely detectable when taurine was added to the perfusing electrolysed buffer. To further understand the protecting mechanism of taurine, we used xanthine-xanthine-oxidase as a superoxide (O2-) generating system and monitored the O2- through yield O2--dependent cytochrome c reduction. We demonstrated that taurine did not affect this system, which indicated that it did not scavenge O2- directly. On the other hand, taurine inhibited the auto-oxidation of adrenaline to adrenochrome at pH 7.8 where this auto-oxidation is O2--independent and superoxide dismutase insensitive. We thus conclude that taurine acts as a potent, but non-specific, scavenger of free radicals that cause heart damage and protects against reperfusion-induced ventricular
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Affiliation(s)
- J Hanna
- Laboratory of Physiology, Faculty of Medical Sciences, Lebanese University, BP 55564 Beirut, Lebanon
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Lersch C, Schmelz R, Erdmann J, Hollweck R, Schulte-Frohlinde E, Eckel F, Nader M, Schusdziarra V. Treatment of HCC with pravastatin, octreotide, or gemcitabine--a critical evaluation. Hepatogastroenterology 2004; 51:1099-103. [PMID: 15239254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
BACKGROUND/AIMS New perspectives in the treatment of advanced hepatocellular carcinomas have recently been inaugurated with the application of hydroxymethylglutaryl coenzyme A reductase inhibitors i.e. pravastatin, the somatostatin analogue octreotide, or the cytidine analogue gemcitabine. The present study aimed to evaluate these substances in patients with progressive tumor growth. METHODOLOGY A total of 58 patients either received 3 x 200 microg/day octreotide for 2 months followed by 20mg octreotide LAR every 4 weeks (n=30) or 40-80 mg pravastatin (n=20) or 80-90 mg/m2 gemcitabine over 24 hours weekly in cycles of 4 weeks (n=8). Kaplan-Meier survival curves and the log-rank test were used for univariate comparison of sur vival. RESULTS The median overall survival of patients receiving octreotide was 5 months, of patients receiving pravastatin 7.2 months and of patients receiving gemcitabine 3.5 months. The difference between the pravastatin and the gemcitabine groups was significant. No WHO grade 3 or 4 side effects were seen in either group of patients. CONCLUSIONS These results do not confirm those of former studies. Neither pravastatin, nor octreotide, nor gemcitabine did prolong the patients' median overall survival as compared to control groups reported by other authors. New therapeutic strategies have to be found for patients with advanced hepatocellular carcinomas.
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Affiliation(s)
- C Lersch
- II. Department of Internal Medicine, Technical University of Munich, Klinikum Rechts der Isar, Munich, Germany.
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Krasikova RN, Zaitsev VV, Ametamey SM, Kuznetsova OF, Fedorova OS, Mosevich IK, Belokon YN, Vyskocil S, Shatik SV, Nader M, Schubiger PA. Catalytic enantioselective synthesis of 18F-fluorinated α-amino acids under phase-transfer conditions using (s)-NOBIN. Nucl Med Biol 2004; 31:597-603. [PMID: 15219278 DOI: 10.1016/j.nucmedbio.2003.12.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
We describe a new method for the asymmetric synthesis of [(18)F]fluorinated aromatic alpha-amino acids (FAA) under phase transfer conditions using achiral glycine derivative NiPBPGly and (S)-NOBIN as a novel substrate/catalyst pair. The key alkylation step proceeds under mild conditions. Substituted [(18)F]fluorobenzylbromides were prepared using nucleophilic [(18)F]fluoride and were used as alkylation agents. Two important FAA, 2-[(18)F]fluoro-L-tyrosine (2-FTYR) and 6-[(18)F]fluoro-L-3,4-dihydroxyphenylalanine (6-FDOPA), were synthesized with an ee of 92 and 96%, respectively. The total synthesis time was 110-120 min and radiochemical yields (d.c.) were 25+/-6% for 2-FTYR and 16+/-5% for 6-FDOPA.
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Affiliation(s)
- R N Krasikova
- Institute of Human Brain, Russian Academy of Science, 9, Pavlov strasse, 197376, St.-Petersburg, Russia
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Haddad E, Nossov A, Guenneau F, Nader M, Grosso D, Sanchez C, Gédéon A. Exploring the internal structure of mesoporous powders and thin films by continuous flow laser-enhanced 129Xe NMR. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0167-2991(04)80665-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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20
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Rossmann H, Alper SL, Nader M, Wang Z, Gregor M, Seidler U. Three 5'-variant mRNAs of anion exchanger AE2 in stomach and intestine of mouse, rabbit, and rat. Ann N Y Acad Sci 2001; 915:81-91. [PMID: 11193604 DOI: 10.1111/j.1749-6632.2000.tb05226.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [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: 11/29/2022]
Abstract
AE2 is one of three known isoforms of the anion exchanger (AE) gene family. The use of alternative promoters, resulting in a tissue-specific transcript pattern, was reported for all AE genes. Three N-terminal variant AE2 subtypes are described: AE2a, AE2b, and AE2c. Although the basolaterally located parietal cell anion exchanger is known to be an AE2, the molecular identity of the basolateral and apical anion exchangers throughout the gut are still unknown. This article summarizes functional, immunohistochemical, and Western blot data demonstrating the basolateral localization of the gastric and intestinal AE2 in rabbit, mouse, and rat, and showing the AE2 subtype mRNA expression pattern in the stomach and along the intestine of rabbit and mouse: AE2a is expressed in all studied tissues, but most strongly in the colon; AE2b is expressed mainly in the stomach; and AE2c is detected nearly exclusively in the stomach. Further investigation is necessary to characterize the apical anion transport protein involved in NaCl absorption and HCO3- secretion in the gut.
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Affiliation(s)
- H Rossmann
- Department of Medicine, Eberhard-Karls University, Tübingen, Germany.
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Zeisler S, Nader M, Theobald A, Oberdorfer F. Conversion of No-carrier-added [11C]carbon dioxide to [11C]carbon monoxide on molybdenum for the synthesis of 11C-labelled aromatic ketones. Appl Radiat Isot 1997. [DOI: 10.1016/s0969-8043(97)00109-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nader M, Lamprecht G, Classen M, Seidler U. Different regulation by pHi and osmolarity of the rabbit ileum brush-border and parietal cell basolateral anion exchanger. J Physiol 1994; 481 ( Pt 3):605-15. [PMID: 7707229 PMCID: PMC1155904 DOI: 10.1113/jphysiol.1994.sp020467] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
1. The purpose of this study was to look for evidence of a pH-sensitive modifier site on the parietal cell basolateral anion exchanger, determine the pH range in which allosteric regulation takes place, investigate the effect of the osmolarity on internal pH (pHi) dependence and compare it with that of the ileum brush-border anion exchanger. 2. When the pHi in parietal cell basolateral membrane (BLM) vesicles was increased, the rate of Cl(-)-gradient-driven 36Cl- uptake increased from 6.03 +/- 2.24 to 38.09 +/- 3.33 nmol (mg protein)-1 with the steep increase in anion exchange rates occurring within a narrow pH range between pHi 7.0 and 7.5. This was due to allosteric activation by internal OH- and not due to a change in driving force, since the driving force for maximal exchange rates was provided by the outwardly directed Cl- gradient. 3. The pHi dependency curve of parietal cell BLM anion exchange rates was shifted to the left by 0.25 pH units by increasing the osmolarity of the intra- and extravesicular solutions from 300 to 380 mosmol l-1. Thus cell shrinking may activate the parietal cell anion exchanger without a change in pHi and without phosphorylation of the anion exchanger protein. 4. In ileum brush-border membranes, the pHi-dependent increase in the rate of Cl(-)-gradient-driven 36Cl- uptake was more gradual and the half-maximal anion exchange rate was attained at lower pHi (pH 6.5). Increasing the osmolarity from 300 to 500 mosmol l-1 had no effect on pH dependence. 5. We conclude that the parietal cell basolateral and ileum brush-border anion exchangers possess an internal modifier site for allosteric activation by OH-, but the pH range in which allosteric regulation occurs differs between the two exchangers, as does the effect of an increase in osmolarity. Since current evidence suggests that both the parietal cell basolateral and the ileum brush-border anion exchanger are encoded by the AE2 gene, the differences in pHi dependence between the two may be due to alternative splicing, post-transcriptional modification, or the different membrane environment. 6. The pHi range for allosteric activation found in this study would suggest that for both the ileum and the parietal cell anion exchanger, but especially for the latter, a potentiating effect of the allosteric activation and the HCO3- availability occurs within the physiological pHi range and can cause dramatic increases in maximal anion exchange rates with increasing pHi.
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Affiliation(s)
- M Nader
- II Medizinische Klinik, Technischen Universität München, Germany
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Cleary J, Ho B, Nader M, Thompson T. Effects of buprenorphine, methadone and naloxone on acquisition of behavioral chains. J Pharmacol Exp Ther 1988; 247:569-75. [PMID: 3183952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Buprenorphine, methadone and naloxone were administered to pigeons key pecking under a repeated acquisition procedure. Under this procedure subjects are required to emit a new sequence of responses each session to receive access to food. All three drugs reduced overall key pecking rates although naloxone's rate-reducing effect was limited to the highest dose (30 mg/kg). The dose-effect curves for overall key pecking rate under buprenorphine and methadone were similar though the effective dose range for buprenorphine appeared wider. Methadone increased percentage of total errors at the highest doses, but neither buprenorphine nor naloxone affected total error levels very much. Within-session errors were increased early in the session under high methadone doses. Low buprenorphine doses also showed some tendency to increase errors early in the session. Buprenorphine and methadone reduced the number of chains completed in a dose-dependent manner. Buprenorphine was also administered daily at the most behaviorally disruptive dose (10 mg/kg/day). Under this dosing schedule, the behavior-suppressing effects of buprenorphine returned to base-line levels within 4 days. Error rates were unaffected by daily buprenorphine administration.
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Affiliation(s)
- J Cleary
- Behavioral Pharmacology Laboratory, University of Minnesota, Minneapolis
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Abstract
Interactions between methadone and acute and chronic imipramine were studied in pigeons key pecking under a multiple variable interval 15-sec variable interval 150-sec schedule of food presentation. Both drugs decreased response rates at the highest doses. The VI 15-sec schedule was slightly more sensitive to acute drug administration than was the variable interval 150-sec schedule. Acute combinations of the two drugs neither ameliorated nor exacerbated the effects of either drug alone. Chronic imipramine alone had no lasting effect on responding. Unlike acute combinations, chronic imipramine lessened the rate reducing effect of methadone.
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