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Benkert R, Balling A, Zimmermann U. Direct Measurements of the Pressure and Flow in the Xylem Vessels ofNicotiana tabacumand their Dependence on Flow Resistance and Transpiration Rate. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1438-8677.1991.tb00254.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Zimmermann U, Balling A, Rygol J, Link A, Haase A. Comments on the Article of J. B. Passioura “An Impasse in Plant Water Relations?”. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1438-8677.1991.tb00251.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Imkamp F, Herrmann TRW, Stolzenburg JU, Rassweiler J, Sulser T, Zimmermann U, Dziuba S, Kuczyk MA, Burchardt M. Development of urologic laparoscopy in Germany, Austria, and Switzerland: a survey among urologists. World J Urol 2014; 32:1363-74. [PMID: 24493294 DOI: 10.1007/s00345-014-1250-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Accepted: 01/22/2014] [Indexed: 10/25/2022] Open
Abstract
PURPOSE Laparoscopy introduction has dramatically changed urology. Novel techniques, such as laparoendoscopic single-site surgery (LESS) and natural orifice translumenal endoscopic surgery (NOTES), might also have substantial influence. This 2012 survey evaluated present laparoscopy use, its appraisal among urologic surgeons, laparoscopy training, and use of new techniques. Results were compared to the previous surveys, demonstrating the 10-year development of laparoscopy. METHODS A detailed questionnaire regarding demographic data, laparoscopy use, attitudes concerning laparoscopy, and novel techniques was send to 424 departments in Germany, Austria, and Switzerland. Procedures performed in 25 indications were quantitatively evaluated. RESULTS The response rate was 63 % (269). Eighty-six percent of the respondents reported performing laparoscopy, compared to 54 % in 2002. Only 16 % expected economic advantages with laparoscopy, whereas 67 % expected shorter hospitalization. Seventy percent of responders anticipated comparable functional and oncological results between laparoscopic procedures and open surgery. Slow learning curves (81 %) and insufficient training facilities (32 %) were reported to impair laparoscopic surgery. On average, laparoscopic and non-laparoscopic surgical teams consisted of 2.5 and 3.5 members, respectively. LESS procedures were performed at 15 % of institutions. Twenty-two percent of respondents considered NOTES techniques valuable for future urology. Few indications (laparoscopic prostatectomies or nephrectomies) were performed frequently in specialized centers, and the rapidly increasing procedure numbers observed between 2002 and 2007 had dropped to a mild accretion. The results demonstrate broad acceptance of laparoscopy in German urologic surgery, depict the need for structured training facilities, and indicate limited impact of novel techniques (LESS and NOTES). CONCLUSIONS The survey demonstrates the 10-year development of urologic laparoscopy and the broad acceptance of laparoscopic techniques.
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Michel MS, Vervenne W, de Santis M, Fischer von Weikersthal L, Goebell PJ, Lerchenmueller J, Zimmermann U, Bos MM, Freier W, Schirrmacher-Memmel S, Staehler MD, Pahernik S, Los M, Schenck M, Flörcken A, Van Arkel C, Hauswald K, Indorf M, Gottstein D, Eichelberg C. SWITCH: A randomized sequential open-label study to evaluate efficacy and safety of sorafenib (SO)/sunitinib (SU) versus SU/SO in the treatment of metastatic renal cell cancer (mRCC). J Clin Oncol 2014. [DOI: 10.1200/jco.2014.32.4_suppl.393] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
393 Background: The sequential use of SO and SU has been investigated retrospectively in patients with mRCC. We report here results from the first randomized study to prospectively compare SO/SU versus SU/SO. Methods: Pts with mRCC unsuitable for cytokines without prior systemic therapy, ECOG PS 0/1, MSKCC score low or intermediate, and ≥1 measurable lesion were randomized to receive open-label SO/SU (arm A) or SU/SO (arm B) in standard dosage. Primary endpoint: total PFS (T-PFS) from randomization to event during 2nd line therapy. Therapy continued until progression or intolerability. The study was powered to detect a 47% increase in T-PFS with SO/SU compared to SU/SO using log-rank testing and Cox proportional hazard regression model. ( NCT00732914 ). Results: A total of 365 pts were enrolled: 182 arm A, 183 arm B.The two arms were well balanced: median age (A/B): 64/65 yrs; prior nephrectomy: 74/65%; MSKCC intermediate: 59/51%, low: 39/45%; clear cell histology: 90/84%. At time of final T-PFS analysis 220 events had occurred (A, n=117 [64%]; B, n=103 [56%]). There was no statistically significant difference in T-PFS across arms: HR 1.01, p=0.54, arm A and arm B, respectively. Likewise, there was no statistically significant difference in OS: HR 0.997, p=0.49, nor in the first PFS across arms: HR 1.19, p=0.92. Fewer pts crossed over to receive SO in arm B (n=76) than to receive SU in arm A (n=103). Overall DCR was 72/67%. There was a marked difference in AEs leading to permanent discontinuation between the two groups (18.6/29.5%). Most frequent (>20%) side effects under 1st-line treatment SO vs SU were alopecia (29/4%), diarrhea (43/29%), dysgeusia (8/21%), fatigue (21/34%), HFSR (37/20%), hypertension (24/24%), nausea (18/24%) and rash (22/3%). AEs were generally lower during 2nd-line therapy. Conclusions: There was no significant difference in T-PFS, OS, DCR and 1st-line PFS between the two sequential treatments. Both drugs provided overall benefit regardless of sequence. Side effect profiles differ, but were generally less frequent during 2nd-line therapy. More patients reached 2nd-line in the SO/SU arm. Clinical trial information: NCT00732914.
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Aouidad I, Brentano EF, Sei JF, Clerici T, Zimmermann U, Tchakerian A, Chaussade V, Saiag P. Sous évaluation par la biopsie du caractère invasif du mélanome de Dubreuilh : à partir de 92 patients traités chirurgie micrographique (Slow-Mohs) en collerette. Ann Dermatol Venereol 2013. [DOI: 10.1016/j.annder.2013.09.136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Stope MB, Bradl J, Peters S, Streitbörger A, Weiss M, Zimmermann U, Walther R, Lillig CH, Burchardt M. Shortened isoforms of the androgen receptor are regulated by the cytoprotective heat-shock protein HSPB1 and the tumor-suppressive microRNA miR-1 in prostate cancer cells. Anticancer Res 2013; 33:4921-4926. [PMID: 24222130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
BACKGROUND Shortened, constitutively active androgen receptor (AR) isoforms have been characterized and linked to tumor progression and chemoresistance in prostate cancer (PCa). We examined the regulation of shortened AR isoforms by a newly-identified AR regulatory signaling pathway involving heat-shock protein HSPB1 and microRNA miR-1. MATERIALS AND METHODS HSPB1 and miR-1 were modulated by overexpression and knock-down approaches utilizing the model PCa system, 22Rv1. Subsequently, AR isoform expression levels were quantified by western blot analysis. RESULTS HSPB1 was identified as an inducer and miR-1 as an inhibitor of AR variants, with no detectable discrimination between long and short AR isoform regulation. CONCLUSION In 22Rv1 cells, all AR isoforms were co-regulated by the cytoprotective factor HSPB1 and the tumor suppressor miR-1. Notably, our data provide evidence that HSPB1 inhibition is able to target expression of long as well as of short AR isoforms.
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Ly A, Habib F, Zimmermann U, Gentil-Perret A, Joujoux JM, Clerici T, Stoebner P, Chaussade V, Sei JF. Les chirurgies micrographiques : techniques, indications et applications pratiques en cabinet. Ann Dermatol Venereol 2013; 140:647-55. [DOI: 10.1016/j.annder.2013.04.102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 03/25/2013] [Accepted: 04/11/2013] [Indexed: 10/26/2022]
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de Timary P, Starkel P, Koopmann A, Racz I, Markert A, Mauer D, Stoffel-Wagner B, Zimmer A, Zimmermann U, Mick I. S15 * ALCOHOL DEPENDENCE AND NEUROENDOCRINOLOGY - NEW FINDINGS AND PERSPECTIVES. Alcohol Alcohol 2013. [DOI: 10.1093/alcalc/agt086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Zimmermann U, Mick I, Plawecki M, O'Connor S, Ramchandani V, Leggio L, Ray L, Courtney K, Wiers R. S27 * INNOVATIVE TECHNIQUES IN HUMAN LABORATORY ALCOHOL RESEARCH. Alcohol Alcohol 2013. [DOI: 10.1093/alcalc/agt105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Claustres M, Kožich V, Dequeker E, Fowler B, Hehir-Kwa JY, Miller K, Oosterwijk C, Peterlin B, van Ravenswaaij-Arts C, Zimmermann U, Zuffardi O, Hastings RJ, Barton DE. Recommendations for reporting results of diagnostic genetic testing (biochemical, cytogenetic and molecular genetic). Eur J Hum Genet 2013; 22:160-70. [PMID: 23942201 PMCID: PMC3895644 DOI: 10.1038/ejhg.2013.125] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Genetic test results can have considerable importance for patients, their parents and more remote family members. Clinical therapy and surveillance, reproductive decisions and genetic diagnostics in family members, including prenatal diagnosis, are based on these results. The genetic test report should therefore provide a clear, concise, accurate, fully interpretative and authoritative answer to the clinical question. The need for harmonizing reporting practice of genetic tests has been recognised by the External Quality Assessment (EQA), providers and laboratories. The ESHG Genetic Services Quality Committee has produced reporting guidelines for the genetic disciplines (biochemical, cytogenetic and molecular genetic). These guidelines give assistance on report content, including the interpretation of results. Selected examples of genetic test reports for all three disciplines are provided in an annexe.
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Grisk O, Schaper K, Steinbach A, Schlüter T, Zimmermann U, Rettig R. Role of renal innervation and endothelin‐1 for the regulation of upper urinary tract contractions. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.698.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Grisk O, Meissner T, Donner A, Braun D, Zimmermann U, Rettig R. Rho kinase (ROCK) inhibition counteracts tyrosine kinase inhibitor‐induced rise in arterial pressure and renal vascular resistance. FASEB J 2013. [DOI: 10.1096/fasebj.27.1_supplement.1110.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Zimmermann U, MüNnich KO, Roether W. Downward Movement of Soil Moisture Traced by Means of Hydrogen Isotopes. ISOTOPE TECHNIQUES IN THE HYDROLOGIC CYCLE 2013. [DOI: 10.1029/gm011p0028] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Saiag P, Hélias-Rodzewicz Z, Longvert C, Von Diemling A, Marin C, Zimmermann U, Clerici T, Emile JF. Comparaison des techniques de détection des mutations BRAF dans les mélanomes. Ann Dermatol Venereol 2012. [DOI: 10.1016/j.annder.2012.10.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Chaussade V, Sznajder M, Sei JF, Zimmermann U, CogrelL O, Guillot B, Habib F, Aegerter P, Saiag P. Résultats préliminaires de l’étude médicoéconomique BACHIMO comparant la chirurgie micrographique de Mohs (CMM) à l’exérèse chirurgicale (EC). Ann Dermatol Venereol 2012. [DOI: 10.1016/j.annder.2012.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hélias-Rodzewicz Z, Colomba E, Von Diemling A, Marin C, Terrones N, Pechaud D, Surel S, Côté JF, Peschaud F, Capper D, Blons H, Zimmermann U, Clerici T, Saiag P, Emile JF. Détection des mutations BRAFV600 dans les mélanomes : la comparaison de quatre techniques est en faveur d’une stratégie de d’immuno-histochimie éventuellement suivie d’un pyroséquensage. Ann Pathol 2012. [DOI: 10.1016/j.annpat.2012.09.114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ehrenberger W, Rüger S, Rodríguez-Domínguez CM, Díaz-Espejo A, Fernández JE, Moreno J, Zimmermann D, Sukhorukov VL, Zimmermann U. Leaf patch clamp pressure probe measurements on olive leaves in a nearly turgorless state. PLANT BIOLOGY (STUTTGART, GERMANY) 2012; 14:666-674. [PMID: 22288430 DOI: 10.1111/j.1438-8677.2011.00545.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The non-invasive leaf patch clamp pressure (LPCP) probe measures the attenuated pressure of a leaf patch, P(p) , in response to an externally applied magnetic force. P(p) is inversely coupled with leaf turgor pressure, P(c) , i.e. at high P(c) values the P(p) values are small and at low P(c) values the P(p) values are high. This relationship between P(c) and P(p) could also be verified for 2-m tall olive trees under laboratory conditions using the cell turgor pressure probe. When the laboratory plants were subjected to severe water stress (P(c) dropped below ca. 50 kPa), P(p) curves show reverse diurnal changes, i.e. during the light regime (high transpiration) a minimum P(p) value, and during darkness a peak P(p) value is recorded. This reversal of the P(p) curves was completely reversible. Upon watering, the original diurnal P(p) changes were re-established within 2-3 days. Olive trees in the field showed a similar turnover of the shape of the P(p) curves upon drought, despite pronounced fluctuations in microclimate. The reversal of the P(p) curves is most likely due to accumulation of air in the leaves. This assumption was supported with cross-sections through leaves subjected to prolonged drought. In contrast to well-watered leaves, microscopic inspection of leaves exhibiting inverse diurnal P(p) curves revealed large air-filled areas in parenchyma tissue. Significantly larger amounts of air could also be extracted from water-stressed leaves than from well-watered leaves using the cell turgor pressure probe. Furthermore, theoretical analysis of the experimental P(p) curves shows that the propagation of pressure through the nearly turgorless leaf must be exclusively dictated by air. Equations are derived that provide valuable information about the water status of olive leaves close to zero P(c) .
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Michel MS, Vervenne W, Goebell PJ, Von Weikersthal LF, Freier W, De Santis M, Zimmermann U, Bos MM, Trojan L, Lerchenmuller CA, Schenk M, Staehler MD, Flörcken A, Pahernik S, Los M, Van Arkel C, Schirrmacher-Memmel S, Eichelberg C. Phase III randomized sequential open-label study to evaluate efficacy and safety of sorafenib (SO) followed by sunitinib (SU) versus sunitinib followed by sorafenib in patients with advanced/metastatic renal cell carcinoma without prior systemic therapy (SWITCH Study): Safety interim analysis results. J Clin Oncol 2012. [DOI: 10.1200/jco.2012.30.15_suppl.4539] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
4539 Background: Several retrospective studies have investigated the sequential use of SO and SU. Some smaller trials support the use of SO followed by SU forming the rationale for this study. Methods: Pts with metastatic RCC unsuitable for cytokines without prior systemic therapy, ECOG PS 0/1, MSKCC score low or intermediate, and ≥1 measurable lesion (CT/MRI every 12 weeks) were randomized to SO->SU or SU->SO in standard dosage (primary endpoint total PFS from randomization to event during 2nd line therapy). Treatment continues until progression or intolerability. Monitoring includes echocardiography and NT pro-BNP. Results: Baseline characteristics of 361 randomized pts (116 completed) are balanced between arms. Safety data of 333 pts are evaluable. AE occurring in >10% of pts are listed in tab. 1. Left-ventricular ejection fraction (LVEF) at screening, switch of treatment, and end of study are given in tab. 1. AE occurred in 93.4% and 92.8%; grade 3/4 AE in 59.9% and 50%; and SAE in 46.7% and 42.2% in the SO->SU and SU->SO arm, respectively. Updated results will be presented. Conclusions: AE frequencies are higher in 1st than in 2nd line treatments. Typical AE profiles for SO and SU are observed. LVEF values are in a similar range. [Table: see text]
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Stope MB, Schubert T, Staar D, Rönnau C, Streitbörger A, Kroeger N, Kubisch C, Zimmermann U, Walther R, Burchardt M. Effect of the heat shock protein HSP27 on androgen receptor expression and function in prostate cancer cells. World J Urol 2012; 30:327-31. [PMID: 22362414 DOI: 10.1007/s00345-012-0843-z] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2011] [Accepted: 02/10/2012] [Indexed: 11/25/2022] Open
Abstract
PURPOSE Heat shock proteins (HSP) are involved in processes of folding, activation, trafficking and transcriptional activity of most steroid receptors including the androgen receptor (AR). Accumulating evidence links rising heat shock protein 27 (HSP27) levels with the development of castration-resistant prostate cancer. In order to study the functional relationship between HSP27 and the AR, we modulated the expression of the small heat shock protein HSP27 in human prostate cancer (PC) cell lines. METHODS HSP27 protein concentrations in LNCaP and PC-3 cells were modulated by over-expression or silencing of HSP27. The effects of HSP27 on AR protein and mRNA levels were monitored by Western blotting and quantitative RT-PCR. RESULTS Treatment for the AR-positive LNCaP with HSP27-specific siRNA resulted in a down-regulation of AR levels. This down-regulation of protein was paralleled by a decrease in AR mRNA. Most interestingly, over-expression of HSP27 in PC-3 cells led to a significant increase in AR mRNA although the cells were unable to produce functional AR protein. CONCLUSION The observation that HSP27 is involved in the regulation of AR mRNA by a yet unknown mechanism highlights the complexity of HSP27-AR signaling network.
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Bosset D, Moreau S, Longvert C, Helias S, Marin C, Clérici T, Zimmermann U, Aegerter P, Emile JF, Saiag P. Fréquence et valeur pronostique des mutations BRAF dans les métastases ganglionnaires et cutanées du mélanome. Ann Dermatol Venereol 2011. [DOI: 10.1016/j.annder.2011.09.139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Mahé E, Zimmermann U. [Significant improvement in ulcerative necrobiosis lipoidica with doxycycline]. Ann Dermatol Venereol 2011; 138:686-8. [PMID: 21978507 DOI: 10.1016/j.annder.2011.02.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 09/01/2010] [Accepted: 02/21/2011] [Indexed: 11/29/2022]
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Knoedler M, Zakarneh A, Zimmermann U, Woelke K, Kaschke O, Keilholz U. 8591 POSTER Effects of Human Papillomavirus (HPV) and Other Potential Risk Factors on Survival in Patients With Oropharyngeal Cancer. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)72233-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lubka-Pathak M, Shah AA, Gallozzi M, Müller M, Zimmermann U, Löwenheim H, Pfister M, Knipper M, Blin N, Schimmang T. Altered expression of securin (Pttg1) and serpina3n in the auditory system of hearing-impaired Tff3-deficient mice. Cell Mol Life Sci 2011; 68:2739-49. [PMID: 21076990 PMCID: PMC11114927 DOI: 10.1007/s00018-010-0586-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Revised: 10/22/2010] [Accepted: 10/26/2010] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Tff3 peptide exerts important functions in cytoprotection and restitution of the gastrointestinal (GI) tract epithelia. Moreover, its presence in the rodent inner ear and involvement in the hearing process was demonstrated recently. However, its role in the auditory system still remains elusive. Our previous results showed a deterioration of hearing with age in Tff3-deficient animals. RESULTS Present detailed analysis of auditory brain stem response (ABR) measurements and immunohistochemical study of selected functional proteins indicated a normal function and phenotype of the cochlea in Tff3 mutants. However, a microarray-based screening of tissue derived from the auditory central nervous system revealed an alteration of securin (Pttg1) and serpina3n expression between wild-type and Tff3 knock-out animals. This was confirmed by qRT-PCR, immunostaining and western blots. CONCLUSIONS We found highly down-regulated Pttg1 and up-regulated serpina3n expression as a consequence of genetically deleting Tff3 in mice, indicating a potential role of these factors during the development of presbyacusis.
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Krawczyk-Bärsch E, Lünsdorf H, Arnold T, Brendler V, Eisbein E, Jenk U, Zimmermann U. The influence of biofilms on the migration of uranium in acid mine drainage (AMD) waters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2011; 409:3059-3065. [PMID: 21665018 DOI: 10.1016/j.scitotenv.2011.04.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Revised: 03/30/2011] [Accepted: 04/27/2011] [Indexed: 05/30/2023]
Abstract
The uranium mine in Königstein (Germany) is currently in the process of being flooded. Huge mass of Ferrovum myxofaciens dominated biofilms are growing in the acid mine drainage (AMD) water as macroscopic streamers and as stalactite-like snottites hanging from the ceiling of the galleries. Microsensor measurements were performed in the AMD water as well as in the biofilms from the drainage channel on-site and in the laboratory. The analytical data of the AMD water was used for the thermodynamic calculation of the predominance fields of the aquatic uranium sulfate (UO(2)SO(4)) and UO(2)(++) speciation as well as of the solid uranium species Uranophane [Ca(UO(2))(2)(SiO(3)OH)(2)∙5H(2)O] and Coffinite [U(SiO(4))(1-x)(OH)(4x)], which are defined in the stability field of pH>4.8 and Eh<960 mV and pH>0 and Eh<300 mV, respectively. The plotting of the measured redox potential and pH of the AMD water and the biofilm into the calculated pH-Eh diagram showed that an aqueous uranium(VI) sulfate complex exists under the ambient conditions. According to thermodynamic calculations a retention of uranium from the AMD water by forming solid uranium(VI) or uranium(IV) species will be inhibited until the pH will increase to >4.8. Even analysis by Energy-filtered Transmission Electron Microscopy (EF-TEM) and electron energy loss spectroscopy (EELS) within the biofilms did not provide any microscopic or spectroscopic evidence for the presence of uranium immobilization. In laboratory experiments the first phase of the flooding process was simulated by increasing the pH of the AMD water. The results of the experiments indicated that the F. myxofaciens dominated biofilms may have a substantial impact on the migration of uranium. The AMD water remained acid although it was permanently neutralized with the consequence that the retention of uranium from the aqueous solution by the formation of solid uranium species will be inhibited.
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Junker H, Venz S, Zimmermann U, Thiele A, Scharf C, Walther R. Stage-related alterations in renal cell carcinoma--comprehensive quantitative analysis by 2D-DIGE and protein network analysis. PLoS One 2011; 6:e21867. [PMID: 21760917 PMCID: PMC3131398 DOI: 10.1371/journal.pone.0021867] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Accepted: 06/07/2011] [Indexed: 12/31/2022] Open
Abstract
Renal cell carcinoma accounts for about 3% of adult malignancies and 85% of neoplasms arising from the kidney. To identify potential progression markers for kidney cancer we examined non-neoplastic and neoplastic kidney tissue from three groups of patients, which represent different tumor stages (pT1, pT2, pT3) by a fluorescence two-dimensional difference gel electrophoresis (2D-DIGE) approach combined with MALDI-ToF-MS/MS. Delta2D software package was used for gel image based quantification and statistical analysis. Thereby, a comprehensive Principal Component Analysis (PCA) could be performed and allowed a robust quality control of the experiment as well as a classification of the analyzed samples, which correlated with the predicted stages from the pathological examination. Additionally for selected candidate proteins we detected a correlation to the tumor grading as revealed by immunohistochemistry. On the 2D protein map 176 spots out of 989 were detected as at least 2-fold differentially expressed. These spots were analyzed by MALDI-ToF-MS/MS and 187 different proteins were identified. The functional clustering of the identified proteins revealed ten groups. Within these groups we found 86 enzymes, 63 proteins of unknown function, 14 transporter, 8 peptidases and 7 kinases. From the systems biology approach we could map many of these proteins in major pathways involved in remodelling of cytoskeleton, mitochondrial dysfunctions and changes in lipid metabolism. Due to complexity of the highly interconnected pathway network, further expression and functional validation of these proteins might provide new insights in kidney cancer progression to design novel diagnostic and therapeutic strategies.
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