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Zoughaib WS, Hoffman RL, Yates BA, Moorthi RN, Lim K, Coggan AR. Short-term beetroot juice supplementation improves muscle speed and power but does not reduce blood pressure or oxidative stress in 65-79 y old men and women. Nitric Oxide 2023; 138-139:34-41. [PMID: 37244392 PMCID: PMC10527284 DOI: 10.1016/j.niox.2023.05.005] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 05/08/2023] [Accepted: 05/24/2023] [Indexed: 05/29/2023]
Abstract
We have previously demonstrated that acute ingestion of inorganic nitrate (NO3-)-rich beetroot juice (BRJ), a source of nitric oxide (NO) via the NO3- → nitrite (NO2-) → NO pathway, can improve muscle speed and power in older individuals. It is not known, however, whether this effect is maintained or perhaps even enhanced with repeated ingestion, or if tolerance develops as with organic nitrates, e.g., nitroglycerin. Using a double-blind, placebo-controlled, crossover design, we therefore studied 16 community-dwelling older (age 71 ± 5 y) individuals after both acute and short-term (i.e., daily for 2 wk) BRJ supplementation. Blood samples were drawn and blood pressure was measured periodically during each ∼3 h experiment, with muscle function determined using isokinetic dynamometry. Acute ingestion of BRJ containing 18.2 ± 6.2 mmol of NO3- increased plasma NO3- and NO2- concentrations 23 ± 11 and 2.7 ± 2.1-fold over placebo, respectively. This was accompanied by 5 ± 11% and 7 ± 13% increases in maximal knee extensor speed (Vmax) and power (Pmax), respectively. After daily supplementation for 2 wk, BRJ ingestion elevated NO3- and NO2- levels 24 ± 12 and 3.3 ± 4.0-fold, respectively, whereas Vmax and Pmax were 7 ± 9% and 9 ± 11% higher than baseline. No changes were observed in blood pressure or in plasma markers of oxidative stress with either acute or short-term NO3- supplementation. We conclude that both acute and short-term dietary NO3- supplementation result in similar improvements in muscle function in older individuals. The magnitudes of these improvements are sufficient to offset the decline resulting from a decade or more of aging and are therefore likely to be clinically significant.
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Affiliation(s)
- William S Zoughaib
- Department of Kinesiology, School of Health & Human Sciences, Indiana University Purdue University, Indianapolis, USA
| | - Richard L Hoffman
- Department of Kinesiology, School of Health & Human Sciences, Indiana University Purdue University, Indianapolis, USA
| | - Brandon A Yates
- Indiana Center for Musculoskeletal Health, School of Medicine, Indiana University School of Medicine, USA
| | - Ranjani N Moorthi
- Division of Nephrology & Hypertension, School of Medicine, Indiana University School of Medicine, USA
| | - Kenneth Lim
- Division of Nephrology & Hypertension, School of Medicine, Indiana University School of Medicine, USA
| | - Andrew R Coggan
- Department of Kinesiology, School of Health & Human Sciences, Indiana University Purdue University, Indianapolis, USA; Indiana Center for Musculoskeletal Health, School of Medicine, Indiana University School of Medicine, USA.
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Abstract
Aging is associated with skeletal muscle strength decline and cardiac diastolic dysfunction. The structural arrangements of the sarcomeric proteins, such as myosin binding protein-C (MyBP-C) are shown to be pivotal in the pathogenesis of diastolic dysfunction. Yet, the role of fast (fMyBP-C) and slow (sMyBP-C) skeletal muscle MyBP-C remains to be elucidated. Herein, we aimed to characterize MyBP-C and its paralogs in the fast tibialis anterior (TA) muscle from adult and old mice. Immunoreactivity preparations showed that the relative abundance of the fMyBP-C paralog was greater in the TA of both adult and old, but no differences were noted between groups. We further found that the expression level of cardiac myosin binding protein-C (cMyBP-C), an important modulator of cardiac output, was lowered by age. Standard SDS-PAGE along with Pro-Q Diamond phosphoprotein staining did not identify age-related changes in phosphorylated MyBP-C proteins from TA and cardiac muscles; however, it revealed that MyBP-C paralogs in fast skeletal and cardiac muscle were highly phosphorylated. Mass spectrometry further identified glycogen phosphorylase, desmin, actin, troponin T, and myosin regulatory light chain 2 as phosphorylated myofilament proteins in both ages. MyBP-C protein-bound carbonyls were determined using anti-DNP immunostaining and found the carbonyl level of fMyBP-C, sMyBP-C, and cMyBP-C to be similar between old and adult animals. In summary, our data showed some differences regarding the MyBP-C paralog expression and identified an age-related reduction of cMyBP-C expression. Future studies are needed to elucidate which are the age-driven post-translational modifications in the MyBP-C paralogs.
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Affiliation(s)
- L. R. Perazza
- Department of Physical Therapy, College of Health & Rehabilitation Sciences: Sargent College, Boston University, 635 Commonwealth Ave, Boston, MA 02215 USA
| | - G. Wei
- Department of Physical Therapy, College of Health & Rehabilitation Sciences: Sargent College, Boston University, 635 Commonwealth Ave, Boston, MA 02215 USA
| | - L. V. Thompson
- Department of Physical Therapy, College of Health & Rehabilitation Sciences: Sargent College, Boston University, 635 Commonwealth Ave, Boston, MA 02215 USA
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Daryanto B, Naim HY, Budaya TN. The Effect of Tamsulosin, Dutasteride Monotherapy and Tamsulosin-Dutasteride Combination on Prostate Smooth Muscle Contractility in BPH Model Wistar Strain Rattus Novergicus. Med Arch 2023; 77:13-17. [PMID: 36919125 PMCID: PMC10008344 DOI: 10.5455/medarh.2023.77.13-17] [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: 12/14/2022] [Accepted: 01/26/2023] [Indexed: 02/23/2023] Open
Abstract
Background Following the c In the management of BPH, Tamsulosin is an example of a-adrenergic receptor blocker drug that is usually used. In addition, dutasteride is also a BPH drug that works as a group of 5 a reductase inhibitor. However, the weakness of long-term administration of a1-adrenergic receptor antagonists can result in upregulation of prostate smooth muscle cell contractility and expression of a-adrenergic mRNA receptors, resulting in hyperactivity and supersensitivity to a-agonists. Objective Our study aimed to determine the effect of long-term administration of tamsulosin, dutasteride and tamsulosin-dutasteride combination on the contractility of prostate smooth muscle cells in BPH model rats. Methods This study was designed using an experimental post test only method, control group design. It measured the contractility of prostate smooth muscle cells from samples obtained from the prostatic stroma of experimental animals adult male Rattus norvegicus Wistar strain induced BPH and administered tamsulosin 1 mg/kg/day, dutasteride 0.5 mg/kg/day, and a combination of continuous administration for 1, 6 and 12 consecutive days. Data were analyzed using one way ANOVA if the data distribution was normal or Kruskall Walis if the data distribution was abnormal. Result The effect of tamsulosin, dutasteride and the combination of tamsulosin with dutasteride on prostate smooth muscle cell contractility in experimental animals Rattus norvegicus Wistar strain showed that tamsulosin administration for six days, twelve days, and the combination of tamsulosin dutasteride for one day got statistically significant different result (p=0.016; p=0.006; p=0.029) compared to the negative control group. In addition, there was a difference between the tamsulosin and dutasteride combination group for 12 days compared to tamsulosin monotherapy for 6 days and 12 days (p=0.160; p=0.010). Conclusion Continuous administration of monotherapy tamsulosin has an upregulation effect on the sixth to twelfth day. Decreased contractility of prostate smooth muscle cells occurs on the first day but will increase on the sixth to twelfth day. On the other hand, the results of our study also showed that the combination of tamsulosin and dutasteride gave the effect of reducing contractility and was most effective on day 12.
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Affiliation(s)
- Besut Daryanto
- Department of Urology, Faculty of Medicine, Universitas Brawijaya, Saiful Anwar General Hospital, Malang, East Java, Indonesia
| | - Hamdan Yuwafi Naim
- Department of Urology, Faculty of Medicine, Universitas Brawijaya, Saiful Anwar General Hospital, Malang, East Java, Indonesia
| | - Taufiq Nur Budaya
- Department of Urology, Faculty of Medicine, Universitas Brawijaya, Saiful Anwar General Hospital, Malang, East Java, Indonesia
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Abstract
Bitter taste-sensing type 2 receptors (TAS2Rs or T2Rs), belonging to the subgroup of family A G-protein coupled receptors (GPCRs), are of crucial importance in the perception of bitterness. Although in the first instance, TAS2Rs were considered to be exclusively distributed in the apical microvilli of taste bud cells, numerous studies have detected these sensory receptor proteins in several extra-oral tissues, such as in pancreatic or ovarian tissues, as well as in their corresponding malignancies. Critical points of extra-oral TAS2Rs biology, such as their structure, roles, signaling transduction pathways, extensive mutational polymorphism, and molecular evolution, have been currently broadly studied. The TAS2R cascade, for instance, has been recently considered to be a pivotal modulator of a number of (patho)physiological processes, including adipogenesis or carcinogenesis. The latest advances in taste receptor biology further raise the possibility of utilizing TAS2Rs as a therapeutic target or as an informative index to predict treatment responses in various disorders. Thus, the focus of this review is to provide an update on the expression and molecular basis of TAS2Rs functions in distinct extra-oral tissues in health and disease. We shall also discuss the therapeutic potential of novel TAS2Rs targets, which are appealing due to their ligand selectivity, expression pattern, or pharmacological profiles.
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Affiliation(s)
- Kamila Tuzim
- Department of Clinical Pathomorphology, Medical University of Lublin, ul. Jaczewskiego 8b, 20-090, Lublin, Poland.
| | - Agnieszka Korolczuk
- Department of Clinical Pathomorphology, Medical University of Lublin, ul. Jaczewskiego 8b, 20-090, Lublin, Poland
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Mazara N, Zwambag DP, Noonan AM, Weersink E, Brown SHM, Power GA. Rate of force development is Ca 2+-dependent and influenced by Ca 2+-sensitivity in human single muscle fibres from older adults. Exp Gerontol 2021; 150:111348. [PMID: 33862138 DOI: 10.1016/j.exger.2021.111348] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 04/07/2021] [Accepted: 04/08/2021] [Indexed: 11/20/2022]
Abstract
Natural adult aging is associated with declines in skeletal muscle performance, including impaired Ca2+ sensitivity and a slowing of rapid force production (rate of force redevelopment; ktr). The purpose of this study was to investigate the relationship between impaired Ca2+ sensitivity and ktr of single muscle fibres from young and older adults. Participants included 8 young (22-35 yrs) and 8 older (60-81 yrs) males who were living independently. A percutaneous muscle biopsy of the vastus lateralis of each participant was performed. Single muscle fibre mechanical tests included maximal Ca2+-activated force (Po), force-pCa curves, and ktr. We showed a decrease in pCa50 in old type II fibres compared to young, indicating impaired Ca2+ sensitivity in older adults. The ktr behaved in a Ca2+-dependent manner such that with increasing [Ca2+], ktr increases, to a plateau. Interestingly, ktr was not different between young and old muscle fibres. Furthermore, we found strong associations between pCa50 and ktr in both old type I and type II fibres, such that those fibres with lower Ca2+ sensitivity had a slowed ktr. This Ca2+ association, combined with impaired Ca2+ handling in older adults suggests a potential Ca2+-dependent mechanism affecting the transition from weakly- to strongly-bound cross-bridge states, leading to a decline in skeletal muscle performance. Future research is needed to explore the role alterations to Ca2+ sensitivity/handling could be playing in age-related whole muscle performance declines.
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Abstract
BACKGROUND Polycystic ovary syndrome (PCOS), a common hormonal disorder in women, affects 4-18% of women of reproductive age worldwide. A higher prevalence of irritable bowel syndrome was found in women with PCOS. However, the effects and mechanism of PCOS on stomach and colon contractility remain unclear. AIMS This study aims to evaluate the correlation between PCOS and gastrointestinal disorder. METHODS Four-week-old female rats were subcutaneously implanted with pellets containing 7.5 mg of dihydrotestosterone for 13 weeks to create PCOS rat models. After vaginal smears, the estrus cycle stage was evaluated. Oral glucose tolerance test was performed after 90 days of treatment. All animals were killed at 17 weeks. The rats were fasted overnight and then anesthetized before decapitation, and the stomach fundus and colon were surgically removed and cultured in oxygenated Krebs solution. Acetylcholine and carbachol were used to evaluate the cholinergic system on contractility. RESULTS The basal and stomach fundus responded with a reduced frequency and contractility in response to acetylcholine in the PCOS group. Moreover, no difference was found in the spontaneous stomach contractility induced by carbachol in both groups. Lower maximal colon muscle contractility was also found in response to acetylcholine stimulation in PCOS rats. Furthermore, lower maximal muscle contractility was found in response to extracellular calcium levels. MLC20 phosphorylation was also reduced in the gastrointestinal tissue in PCOS rats. CONCLUSIONS PCOS induces gastroparesis and reduces gastrointestinal muscle contractility. This effect is, at least partly, through reducing the responsiveness of acetylcholine and MLC20 phosphorylation.
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Affiliation(s)
- Kai-Lee Wang
- Department of Nursing, Ching Kuo Institute of Management and Health, No. 336, Fuxsin Rd., Zhongshan Dist., Keelung City, 20301, Taiwan, Republic of China.
- Department of Physiology, School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
| | - Shih-Min Hsia
- School of Nutrition and Health Sciences, Taipei Medical University, Taipei, 11031, Taiwan, Republic of China
| | - Paulus S Wang
- Department of Physiology, School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China
- Department of Medical Research and Education, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China
- PhD Program of Aging, College of Medicine, China Medical University, Taichung, Taiwan, Republic of China
- Department of Biotechnology, Asia University, Taichung, Taiwan, Republic of China
| | - Po-Han Lin
- School of Nutrition and Health Sciences, Taipei Medical University, Taipei, 11031, Taiwan, Republic of China
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Eisum AV, Fornander F, Poulsen NS, Andersen AG, Dahlqvist J, Andersen LK, Witting N, Vissing J. Contractile properties are impaired in congenital myopathies. Neuromuscul Disord 2020; 30:649-55. [PMID: 32675003 DOI: 10.1016/j.nmd.2020.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 06/11/2020] [Accepted: 06/16/2020] [Indexed: 11/23/2022]
Abstract
The ratio between muscle strength and muscle cross-sectional area is called the specific force. Fatty replacement of muscles is seen in many myopathies, affecting the specific force, without necessarily affecting the ability of the remaining muscle fibers to contract. This ability is called the contractility and is the ratio between muscle strength and the lean muscle cross-sectional area, i.e. the contractile cross-sectional area. We hypothesized that contractility is disrupted in patients with congenital myopathy, because of defects in contractile proteins of the sarcomere. Peak torque across ankle and knee joints was measured by isokinetic dynamometry in 16 patients with congenital myopathy and 13 healthy controls. Five patients only participated partially in the dynamometer measurements due to severe muscle weakness. Dixon MRI technique was used to quantify muscle fat fractions and calculate cross-sectional area. Patients with congenital myopathy had lower cross-sectional area in all muscle groups (P<0.01), higher fat fraction (P<0.01) and less strength (P<0.005) in all studied muscle groups. Their fat content was more than doubled and peak torque lower than half that in healthy controls. Muscle contractility was reduced (P<0.01) in three of four patient muscle groups. In conclusion, muscle contractility was reduced in patients with congenital myopathy, across different diagnoses, and was independent of the level of muscle fat fraction, suggesting that intrinsic defects of the myocyte are responsible for reduced contractility.
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Arnold P, Njemini R, Vantieghem S, Duchateau J, Mets T, Beyer I, Bautmans I. Peripheral muscle fatigue in hospitalised geriatric patients is associated with circulating markers of inflammation. Exp Gerontol 2017; 95:128-135. [PMID: 28502777 DOI: 10.1016/j.exger.2017.05.007] [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: 09/21/2016] [Revised: 04/06/2017] [Accepted: 05/09/2017] [Indexed: 10/19/2022]
Abstract
Geriatric patients with acute infection show increased muscle weakness and fatigability but the relative contribution of central and peripheral factors is unclear. Hospitalised patients with acute infection (82±6years, N=10) and community-dwelling controls (76±6years, N=19) sustained a maximal voluntary isometric contraction of the M. Adductor Pollicis until strength dropped to 50% of its maximal value. Voluntary muscle activation (VA) was assessed before and at the end of the fatigue protocol using twitch interpolation method and muscle activity was monitored using surface electromyography. Twenty-five circulating inflammatory biomarkers were determined. At pre-fatigue, no significant difference in VA was found between groups. VA decreased to similar levels (~50%) at the end of the fatigue protocol with no association with inflammatory biomarkers. In geriatric patients, muscle activity decreased significantly (p<0.05) during the fatigue protocol, whereas it increased in the controls (time∗group interaction p<0.05). The decrease in muscle activity was significantly related to higher levels of inflammation. Although slower muscle contraction and relaxation were significantly related to higher levels of inflammation, no statistical differences were found between groups. Our results confirm that muscle activity is significantly altered in older patients with acute infection and that local processes are involved.
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Affiliation(s)
- Pauline Arnold
- Department of Geriatric Physiotherapy, SOMT University of Physiotherapy, Amersfoort, The Netherlands; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Rose Njemini
- Gerontology (GERO) Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Stijn Vantieghem
- Gerontology (GERO) Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium
| | - Jacques Duchateau
- Laboratory of Applied Biology & Neurophysiology, Université Libre de Bruxelles (ULB), Brussels, Belgium
| | - Tony Mets
- Gerontology (GERO) Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium; Geriatrics Department, Universitair Ziekenhuis Brussel, Brussels, Belgium
| | - Ingo Beyer
- Gerontology (GERO) Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium; Geriatrics Department, Universitair Ziekenhuis Brussel, Brussels, Belgium
| | - Ivan Bautmans
- Department of Geriatric Physiotherapy, SOMT University of Physiotherapy, Amersfoort, The Netherlands; Gerontology (GERO) Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium; Frailty in Ageing (FRIA) Research Department, Vrije Universiteit Brussel (VUB), Brussels, Belgium; Geriatrics Department, Universitair Ziekenhuis Brussel, Brussels, Belgium.
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Fürer K, Eberli D, Betschart C, Brenneisen R, De Mieri M, Hamburger M, Mennet-von Eiff M, Potterat O, Schnelle M, Simões-Wüst AP, von Mandach U. Inhibition of porcine detrusor contractility by the flavonoid fraction of Bryophyllum pinnatum--a potential phytotherapeutic drug for the treatment of the overactive bladder syndrome. Phytomedicine 2015; 22:158-164. [PMID: 25636885 DOI: 10.1016/j.phymed.2014.11.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [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: 05/28/2014] [Revised: 09/12/2014] [Accepted: 11/15/2014] [Indexed: 06/04/2023]
Abstract
AIMS To determine if the phytotherapeutic agent, Bryophyllum pinnatum, could serve as an alternative drug for the overactive bladder syndrome, and to characterise the fraction responsible for the inhibition of detrusor contractility. METHODS Fractions were prepared from the MeOH extract of B. pinnatum and further analysed by HPLC-PDA-MS. Detrusor muscle strips were prepared from porcine bladders and the electrically induced muscle contractility measured by organ bath. The effect of B. pinnatum leaf press juice (2.5-10%), a flavonoid fraction (0.1-1 mg/ml), and a bufadienolide fraction (0.1-40 μg/ml) on detrusor contractility was assessed and compared with controls (polar fraction (0.5-5 mg/ml) and oxybutynin (10(-8)-10(-6) M)). RESULTS The press juice, at a concentration of 10% led to a reduction of detrusor contractility. Bladder strips treated with the flavonoid fraction showed a significant reduction of the contractility to 21.3 ± 5.2% (1 mg/ml) while the bufadienolide fraction had no inhibitory effect in the investigated concentrations. The polar fraction showed a reduction of the contractility in a pH-dependent fashion. At 10(-6) M concentration oxybutynin reduced the detrusor contractility to 21.9 ± 4.7%. CONCLUSIONS The flavonoid fraction of Bryophyllum pinnatum reduces the porcine detrusor contractility in a dose- and time-dependent manner. Fractions from B. pinnatum may be a new pharmacological approach for the treatment of OAB.
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Affiliation(s)
- K Fürer
- Department of Obstetrics, University Hospital Zurich, CH-8091 Zurich, Switzerland; Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, CH-4056 Basel, Switzerland
| | - D Eberli
- Urology Clinic, University Hospital Zurich, CH-8091 Zurich, Switzerland
| | - C Betschart
- Department of Gynaecology, University Hospital Zurich, CH-8091 Zurich, Switzerland
| | - R Brenneisen
- Department of Clinical Research, University of Bern, CH-3010 Bern, Switzerland
| | - M De Mieri
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, CH-4056 Basel, Switzerland
| | - M Hamburger
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, CH-4056 Basel, Switzerland
| | | | - O Potterat
- Division of Pharmaceutical Biology, Department of Pharmaceutical Sciences, University of Basel, CH-4056 Basel, Switzerland
| | - M Schnelle
- Weleda AG, CH-4144 Arlesheim, Switzerland
| | - A P Simões-Wüst
- Research Department, Paracelsus Hospital Richterswil, CH-8805 Richterswil, Switzerland
| | - U von Mandach
- Department of Obstetrics, University Hospital Zurich, CH-8091 Zurich, Switzerland.
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