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Thum T, Galuppo P, Kneitz S, Fiedler J, Van Laake L, Mummery C, Ertl G, Bauersachs J. WITHDRAWN: MicroRNAs in the Human Heart: A Clue to Fetal Gene Reprogramming in Heart Failure. J Mol Cell Cardiol 2007. [DOI: 10.1016/j.yjmcc.2007.03.815] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hájek P, Macek M, Hladíková M, Houbová B, Alan D, Durdil V, Fiedler J, Malý M, Ostádal P, Veselka J, Krebsová A. Pregnancy-associated plasma protein A and proform eosinophilic major basic protein in the detection of different types of coronary artery disease. Physiol Res 2007; 57:23-32. [PMID: 17223728 DOI: 10.33549/physiolres.930986] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Kryptor system was proven to be a rapid, standard method for pregnancy-associated plasma protein A and proform eosinophilic major basic protein (PAPP-A/proMBP) complex detection in coronary artery disease (CAD). No age and/or gender differences in 51 controls and 110 stable coronary artery disease (SCAD) patients were found. SCAD patients did not differ from controls and no difference in PAPP-A/proMBP levels with regards to the number of affected vessels was found. In 21 unstable angina pectoris (UAP), in 35 without and 66 with ST elevation acute myocardial infarctions (NSTEMI, STEMI respectively) patients PAPP-A/proMBP levels were increased (P=0.004 and P<0.0005, respectively). PAPP-A/proMBP levels did not correlate with cardiac troponin I (cTnI) in STEMI and NSTEMI patients. PAPP-A/ proMBP increase was more frequent than cTnI (P=0.036) within the early phase of STEMI. In NSTEMI patients PAPP-A/proMBP positivity was present in 50% of cTnI negative cases. Receiver operating characteristic (ROC) analysis revealed the highest diagnostic accuracy of PAPP-A/proMBP (0.919) in STEMI cTnI positive cases. The highest specificity/sensitivity PAPP-A/proMBP levels for particular acute coronary syndrome (ACS) types were 10.65-14.75 mIU/l. Combination of PAPP-A/proMBP with cTnI increases their diagnostic efficacy within the early phase of ACS. Our results suggest that PAPP-A/proMBP complex is involved in processes preceding vulnerable plaque development in ACS.
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Pribán V, Fiedler J, Chlouba V. [Ocular symptoms as an indication for carotid endarterectomy]. CESKA A SLOVENSKA OFTALMOLOGIE : CASOPIS CESKE OFTALMOLOGICKE SPOLECNOSTI A SLOVENSKE OFTALMOLOGICKE SPOLECNOSTI 2006; 62:354-9. [PMID: 17039923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Ocular symptoms can be the first sign of carotid artery stenosis. In our carotid endarterectomy patients group were ocular symptoms present in 15%, as the only sign (without accompanying neurological signs) in 10.5%. Amaurosis fugax was a dominant sign in 56 cases, blindness in 5, quadrantanopia in 3; trochlear and oculomotor nerve paresis in one case. Angiography finding of more than 60% ICA stenosis according NASCET criteria was an indication for surgery. The operative technique per se was a microsurgical endarterectomy with selective peroperative shunt application. The 30-d morbidity was 3%--with one case of central retinal artery embolization and subsequent blindness and another case of major residual neurological deficit due to hyperperfusion syndrome and the resultant capsular hemorrhage. Shunt was applied in 3% of cases and microscope was used always since the beginning of the dissection up to the final suture. Considering low perioperative morbidity/mortality rates the carotid endarterectomy represents an important means of brain ischaemia profylaxis. In the process of hemodynamically significant ICA stenosis, indication for surgical management the authors emphasize the role of ocular signs and symptoms and thus the importance of an ophthalmology consultant.
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Fiedler J, Jara P, Luza S, Dorfman M, Grouselle D, Rage F, Lara HE, Arancibia S. Cold stress induces metabolic activation of thyrotrophin-releasing hormone-synthesising neurones in the magnocellular division of the hypothalamic paraventricular nucleus and concomitantly changes ovarian sympathetic activity parameters. J Neuroendocrinol 2006; 18:367-76. [PMID: 16629836 DOI: 10.1111/j.1365-2826.2006.01427.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recent studies suggest thyrotrophin-releasing hormone (TRH) serves as a neurotransmitter and thereby provides a functional vegetative connection between the brain and the ovary. In the present study, magnocellular neurones of the paraventricular nucleus (PVN) in animals subjected to cold exposure were studied to determine the hypothalamic origin of the TRH involved in this pathway. In situ hybridisation analysis of hypothalamic tissue showed that cold exposure causes a two-fold increase in the total number of neurones expressing TRH mRNA in the PVN. Immunohistochemical studies showed that TRH peptide is localised to the magnocellular PVN and that the number of TRH immunoreactive cells increases two-fold following 64 h of cold exposure. Double-immunostaining for MAP-2 and TRH revealed that TRH peptide is localised in the perikarya of the magnocellular neurones. TRH release was measured in vivo from the magnocellular portion of the PVN using push-pull perfusion. Although controls exhibited a very low level of TRH release, animals subjected to cold showed a pulsatile-like TRH release profile with two different patterns of release: (i) low basal level with small bursts of TRH release and (ii) a profile with an up to seven-fold increase in TRH release compared to controls. The colocalisation of TRH with the specific somato-dendritic marker MAP-2 in processes of the magnocellular neurones suggested a local release of TRH. Additional studies demonstrated a reduction in ovarian noradrenaline content after 48 h of cold exposure, a feature indicative of nerve activation at the terminal organ. After 64 h of cold exposure, the ovarian noradrenaline returned to control values but the noradrenaline content of the coeliac ganglia was increased, suggesting a compensatory effect originating in the cell bodies of the sympathetic neurones that innervate the ovary. The correlation between the local release of TRH from dendrites within the magnocellular PVN in conditions of cold and the activation of the sympathetic nerves supplying the ovary raises the possibility that TRH contributes to the processing regulating sympathetic outflow and may thereby impact on the functional activity of the ovary.
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Morales P, Reyes P, Klawitter V, Huaiquín P, Bustamante D, Fiedler J, Herrera-Marschitz M. Effects of perinatal asphyxia on cell proliferation and neuronal phenotype evaluated with organotypic hippocampal cultures. Neuroscience 2006; 135:421-31. [PMID: 16112481 DOI: 10.1016/j.neuroscience.2005.05.062] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2005] [Revised: 05/24/2005] [Accepted: 05/30/2005] [Indexed: 10/25/2022]
Abstract
The present report summarizes studies combining an in vivo and in vitro approach, where asphyxia is induced in vivo at delivery time of Wistar rats, and the long term effects on hippocampus neurocircuitry are investigated in vitro with organotypic cultures plated at postnatal day seven. The cultures preserved hippocampus layering and regional subdivisions shown in vivo, and only few dying cells were observed when assayed with a viability test at day in vitro 27. When properly fixed, cultures from asphyxia-exposed animals showed a decreased amount of microtubule-associated protein-2 immunocytochemically positive cells (approximately 30%), as compared with that from controls. The decrease in microtubule-associated protein-2 immunocytochemistry was particularly prominent in Ammon's horn 1 and dentate gyrus regions (approximately 40%). 5-Bromo-2'deoxyuridine labeling revealed a two-fold increase in cellular proliferation in cultures from asphyxia-exposed, compared with that from control animals. Furthermore, confocal microscopy and quantification using the optical disector technique demonstrated that in cultures from asphyxia-exposed animals approximately 30% of 5-bromo-2'deoxyuridine-positive cells were also positive to microtubule-associated protein-2, a marker for neuronal phenotype. That proportion was approximately 20% in cultures from control animals. Glial fibrillary acidic protein-immunocytochemistry and Fast Red nuclear staining revealed that the core of the hippocampus culture was surrounded by a well-developed network of glial fibrillary acidic protein-positive cells and glial fibrillary acidic protein-processes providing an apparent protective shield around the hippocampus. That shield was less developed in cultures from asphyxia-exposed animals. The increased mitotic activity observed in this study suggests a compensatory mechanism for the long-term impairment induced by perinatal asphyxia, although it is not clear yet if that mechanism leads to neurogenesis, astrogliogenesis, or to further apoptosis.
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Pribań V, Bombic M, Fiedler J. [Comments on eversion technique of carotid endarterectomy]. ROZHLEDY V CHIRURGII : MESICNIK CESKOSLOVENSKE CHIRURGICKE SPOLECNOSTI 2005; 84:448-51. [PMID: 16250616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The authors describe their own modification of carotid endarterectomy by eversion technique which they use in the case of combined stenosis and kinking of internal carotid artery. Complete division of internal carotid artery from the common carotid artery at the bulb is performed in an oblique fashion, following by excision of redundant wall. Added longitudinal incision of common carotid artery enables perfect removal of the atherosclerotic plaque. Proper posterior wall anastomosis of common and internal carotid artery in the bulb is carried out by one-way-up technique. This is an alternative to parachute technique and gives perfect view of operating field, thus decreasing the risk of technical mistake. Eversion technique of carotid endarterectomy represents an ideal operative technique in the case of carotid stenosis combined with kinking.
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Lieb E, Hacker M, Tessmar J, Kunz-Schughart LA, Fiedler J, Dahmen C, Hersel U, Kessler H, Schulz MB, Göpferich A. Mediating specific cell adhesion to low-adhesive diblock copolymers by instant modification with cyclic RGD peptides. Biomaterials 2005; 26:2333-41. [PMID: 15585236 DOI: 10.1016/j.biomaterials.2004.07.010] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2004] [Accepted: 07/22/2004] [Indexed: 11/23/2022]
Abstract
One promising strategy to control the interactions between biomaterial surfaces and attaching cells involves the covalent grafting of adhesion peptides to polymers on which protein adsorption, which mediates unspecific cell adhesion, is essentially suppressed. This study demonstrates a surface modification concept for the covalent anchoring of RGD peptides to reactive diblock copolymers based on monoamine poly(ethylene glycol)-block-poly(D,L-lactic acid) (H(2)N-PEG-PLA). Films of both the amine-reactive (ST-NH-PEG(2)PLA(20)) and the thiol-reactive derivative (MP-NH-PEG(2)PLA(40)) were modified with cyclic alphavbeta3/alphavbeta5 integrin subtype specific RGD peptides simply by incubation of the films with buffered solutions of the peptides. Human osteoblasts known to express these integrins were used to determine cell-polymer interactions. The adhesion experiments revealed significantly increased cell numbers and cell spreading on the RGD-modified surfaces mediated by RGD-integrin-interactions.
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Habisch H, Hermann A, Gastl R, Fiedler J, Nöth U, Kall S, Brenner R, Storch A. Konversion von adulten humanen mesenchymalen Stammzellen in neurale Stammzellen. AKTUELLE NEUROLOGIE 2005. [DOI: 10.1055/s-2005-866652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Rektorová I, Rektor I, Bares M, Dostál V, Ehler E, Fanfrdlová Z, Fiedler J, Klajblová H, Kulist'ák P, Ressner P, Svátová J, Urbánek K, Velísková J. Cognitive performance in people with Parkinson's disease and mild or moderate depression: effects of dopamine agonists in an add-on to L-dopa therapy. Eur J Neurol 2005; 12:9-15. [PMID: 15613141 DOI: 10.1111/j.1468-1331.2004.00966.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In a randomized prospective multi-centre study, we evaluated the cognitive performances of a group of 41 non-demented patients, all with advanced Parkinson's disease (PD) and a current depressive episode, in whom the effects of pramipexole (PPX) and pergolide (PRG) in an add-on to l-dopa therapy were also studied and published with regard to motor symptoms of PD, motor complications and depression. The Trail Making Test, the Stroop test and four subtests (arithmetic, picture completion, digit symbols and similarities) of the Wechsler Adult Intelligence Scale-Revised were performed prior to and 8 months after the administration of either PPX or PRG. We found no statistically significant difference between the two tested drugs or between the first and the last visit in any of the above-listed neuropsychological tests. All patients' motor outcomes significantly improved and we conclusively demonstrated the anti-depressive effect of PPX. The dissociation of dopaminomimetic effects on the different tested domains indicates that there are different pathological mechanisms of cognitive, motor and affective disturbances in advanced PD patients. In our non-demented group of fluctuating depressed PD subjects, both PPX and PRG administration in combination with l-dopa were safe in terms of the effect on cognitive performance.
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Fiedler J. Gene symbol: SEDL. Disease: spondyloephiphyseal dysplasia, late. Hum Genet 2005; 116:233. [PMID: 15818804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
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Mates M, Hrabos V, Hájek P, Malý M, Horák D, Fiedler J, Durdil V, Vojácek J. [Deferral of coronary intervention based on measurement of myocardial fractional flow reserve]. VNITRNI LEKARSTVI 2004; 50:600-5. [PMID: 15521203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
BACKGROUND Myocardial fractional flow reserve (FFR) is a useful method in assessment of functional significance of coronary stenosis. Deferral of intervention of angiographically intermediate lesion based on FFR measurement is safe in selected patient population as previously described. The aim of the study was to assess mid-term results after deferring coronary intervention of intermediate lesion in a non-selected patient population with no respect to the extent of coronary artery disease and to the results of stress tests if performed. METHODS A coronary intervention of angiographically intermediate lesion (40 - 70% according to QCA) was deferred in a group of 50 consecutive patients (33 men, mean age 60.8 +/- 10.2 y.) on the basis of FFR > or = 0.75 (mean FFR 0.89 +/- 0.06). FFR was measured in 62 lesions (mean stenosis diameter 55 +/- 7%, left anterior descending 34 lesions, circumflex artery 13 lesions, right coronary artery 15 lesions). One-vessel disease was presented in 14 pts (28%), 36 pts (72%) presented with multivessel disease (two-vessel disease in 27 pts - 54% and three-vessel disease in 9 pts - 18%). Stress test was positive in 15 pts, in 1 pts. negative, and in 3 pts. non-diagnostic. All-cause mortality, cardiac mortality, non-fatal myocardial infarction (MI) and ischemia driven target vessel revascularization (TLR) were recorded during follow-up. Severity of angina pectoris (CCS classification) and a need for antianginal treatment (beta-blockers, nitrates, calcium channel blockers) at the baseline and at the end of clinical follow-up was recorded. RESULTS Follow-up was completed in 49 patients (98%). Mean time of follow-up is 15.4 +/- 2 months (range 12 - 22 months, median 15 months), two patients died (4 %)--one from colon cancer, the other patient died from lung cancer, there was not any cardiac death recorded, two patients (4%) had target vessel revascularization. Estimated 22 months event-free (all-cause death, MI, TLR) survival was (mean +/- SEM) 86 +/- 7%. There was a significant difference in symptom severity--mean grade of angina pectoris at baseline was 1.8 +/- 1.3, at follow-up 1.1 +/- 1.0 (p < 0.05). There was not difference in use of antianginal drugs was same at baseline and at follow-up (1.7 +/- 0.8 vs. 1.7 +/- 0.7). Thirty-five patients (71%) were treated by statins. CONCLUSIONS Deferring of coronary interventions of intermediate stenosis based on FFR measurement is safe in a mid-term follow-up. Despite of the same intensity of antianginal treatment there was a significant decrease in symptom severity.
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Houška L, Wolfová M, Fiedler J. Economic weights for production and reproduction traits of pigs in the Czech Republic. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0301-6226(03)00128-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Fickert S, Fiedler J, Brenner RE. Identification, quantification and isolation of mesenchymal progenitor cells from osteoarthritic synovium by fluorescence automated cell sorting. Osteoarthritis Cartilage 2003; 11:790-800. [PMID: 14609532 DOI: 10.1016/s1063-4584(03)00167-5] [Citation(s) in RCA: 129] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Identification, quantification and isolation of subpopulations with characteristics of mesenchymal progenitor cells (MPC) from the synovial membrane (SM) from patients with osteoarthritis (OA). METHOD Cells from the SM of patients with end stage OA who underwent total knee joint replacement were enzymatically isolated. One aliquot was directly analyzed by fluorescence automated cell sorting (FACS) using various combinations of surface markers of bone marrow MPC (CD9, CD44, CD54, CD90, and CD166). Remaining cells were cultivated on plastic, expanded over several passages, analyzed by FACS again and tested for their osteo- and chondrogenic potential. The differentiation was analyzed by immuno-/histochemistry and by RT-PCR for the expression of lineage related marker genes. RESULTS Using FACS analysis we could show that the relative proportion of subpopulations expressing triplicate combinations of CD9, CD44, CD54, CD90 and CD166 in the SM from OA patients varies between 3 and 10%. Upon cultivation their relative amount markedly increased to values between 24 and 48%. Within the heterogeneous cell populations it was possible to induce osteogenic and chondrogenic differentiation. Initial sorting for CD9/CD90/CD166 triplicate positive cells proved that this subpopulation contains cells with multipotency for mesenchymal differentiation and thus characteristics of MPC. CONCLUSION Our results show that SM from OA patients contains cells that express typical combinations of MPC surface markers and have the potency of osteogenic and chondrogenic differentiation. Their relative enrichment during in vitro cultivation and the possibility of cell sorting to get more homogenous populations offer interesting perspectives for possible future therapeutic applications.
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Morales P, Klawitter V, Johansson S, Huaiquín P, Barros VG, Avalos AM, Fiedler J, Bustamante D, Gomez-Urquijo S, Goiny M, Herrera-Marschitz M. Perinatal asphyxia impairs connectivity and dopamine neurite branching in organotypic triple culture from rat substantia nigra, neostriatum and neocortex. Neurosci Lett 2003; 348:175-9. [PMID: 12932822 DOI: 10.1016/s0304-3940(03)00507-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The effect of perinatal asphyxia on brain development was studied with organotypic cultures from substantia nigra, neostriatum and neocortex. Asphyxia was induced by immersing foetuses-containing uterine horns removed from ready-to-deliver rats into a water bath for 20 min. Following asphyxia, the pups were nursed by a surrogate dam and sacrificed after 3 days to prepare organotypic cultures. Non-asphyxiated caesarean-delivered pups were used as controls. Morphological features were recorded during in vitro development. At day in vitro (DIV) 24, the cultures were treated for histochemistry using fast red for cell nucleus labelling and antibodies against tyrosine hydroxylase for dopaminergic neurons. Compared to controls, cultures from asphyxiated pups revealed a diminished integration quantified during 21 DIV. After immunocytochemistry and camera lucida reconstruction, tyrosine hydroxylase-positive neurons showed a decreased number of neurites from secondary and higher level branching, demonstrating a vulnerability of the dopaminergic systems after perinatal asphyxia.
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Rektorová I, Rektor I, Bares M, Dostál V, Ehler E, Fanfrdlová Z, Fiedler J, Klajblová H, Kulist'ák P, Ressner P, Svátová J, Urbánek K, Velísková J. Pramipexole and pergolide in the treatment of depression in Parkinson's disease: a national multicentre prospective randomized study. Eur J Neurol 2003; 10:399-406. [PMID: 12823492 DOI: 10.1046/j.1468-1331.2003.00612.x] [Citation(s) in RCA: 155] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
An 8-month multicentre prospective randomized study aimed at comparing the effects of dopamine receptor agonists pramipexole (PPX; Mirapexin) and pergolide (PRG; Permax) as add-on to L-dopa therapy on depression [Montgomery and Asberg Depression Rating Scale (MADRS)] in 41 non-demented patients (25 men, 16 women) suffering from both mild or moderate depression and advanced Parkinson's disease (PD). The assessment was performed by a blinded independent observer. Motor symptoms (UPDRS III), motor complications (UPDRS IV), activities of daily living (UPDRS II and VI) and depressive symptoms as measured by Self - Rating Depression Scale by Zung were evaluated in an open-label design. The average value of Zung scores decreased significantly in both groups with no statistical difference between both groups. A significant decrease in the average value of MADRS scores was present only in the PPX group. The average UPDRS scores decreased significantly with no statistical difference between both groups at the comparable average total daily dose of both preparations. In both cases, the total daily dose of L-dopa decreased significantly but the decrease was statistically more pronounced in the PRG group. Our results demonstrate the antidepressant effect of PPX in patients with PD while we can't make any conclusions with regard to antidepressant effect of PRG.
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Fiedler J, Stöve J, Heber F, Brenner RE. Clinical phenotype and molecular diagnosis of multiple epiphyseal dysplasia with relative hip sparing during childhood (EDM2). ACTA ACUST UNITED AC 2003; 112:144-53. [PMID: 12244547 DOI: 10.1002/ajmg.10554] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
We report on a family of 19 individuals over four generations in which 12 members are affected with a variant of multiple epiphyseal dysplasia. Beginning in childhood, the disease leads to pain and stiffness of knees, ankles, elbows and finger joints. Some adult patients repeatedly suffer from free articular bodies resulting in locking of the joint. Finally, affected individuals are prone to the development of early degenerative joint disease. Mutation screening of candidate regions revealed a novel point mutation at position -1 in the COL9A2 exon 3/intron 3 splicing region. This G --> C substitution most probably induces an alteration of the splicing process. Family screening was carried out by both automated sequencing and by digestion of amplicons with BsaWI. We confirmed the nucleotide substitution in eight clinically affected family members as well as in three presymptomatic young children. Electron microscopy showed that the diameter of collagen fibrils from arthroscopically removed free articular bodies of two patients was not obviously different from that of normal articular cartilage. Together with previous reports our results indicate that mutations leading to skipping of exon 3 within the COL3 domain of the alpha2-chain of collagen type IX may be relatively common in patients with a special subtype of multiple epiphyseal dysplasia (MED) in which the hips are not markedly affected at early age (EDM2). In these patients and their families, mutation screening of the candidate regions may help to confirm the diagnosis, lead to appropriate advice for lifestyle and well based genetic counseling.
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Fiedler J. Noctilucent clouds above ALOMAR between 1997 and 2001: Occurrence and properties. ACTA ACUST UNITED AC 2003. [DOI: 10.1029/2002jd002419] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Fiedler J, Bittner M, Puhl W, Brenner RE. Mutations in the X-linked spondyloepiphyseal dysplasia tarda (SEDL) coding sequence are not a common cause of early primary osteoarthritis in men. Clin Genet 2002; 62:94-5. [PMID: 12123495 DOI: 10.1034/j.1399-0004.2002.620114.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Mates M, Hrabos V, Vojácek J, Hájek P, Malý M, Horák D, Fiedler J, Durdil V. [Angiographically marginally significant coronary stenoses--postponement of intervention based on measurement of myocardial fractional flow reserve]. VNITRNI LEKARSTVI 2002; 48:363-7. [PMID: 12061200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
INTRODUCTION When evaluating angiographically marginal coronary stenoses (i.e. 40-70% reduction of the diameter of the arterial lumen) it is under certain conditions difficult to decide on their actual functional impact. Assessment of the fractional flow reserve (FFR) is a simple method based on assessment of intracoronary pressures during pharmacologically induced hyperaemia. For the severity of stenosis according to previous studies the liminal values is FFR lower than 0.75; furthermore it was proved that intervention of angiographically marginal stenoses with FFR values of 0.75 or more can be safely postponed. OBJECTIVE Test the safety of FFR examination and take in a group of patients with marginally severe stenosis further steps according to results of FFR assessment. MATERIAL AND METHODS During the period from January to Juky 2000 FFR assessments were made in a total of 34 patients (11 women, 23 men, mean age 62 +/- 12 years) who suffered from marginal stenosis of some coronary vessel. The FFR examination took place under pharmacologically induced hyperaemia after intracoronary adenosine administration. RESULTS Measurements were made in a total of 41 stenoses. Only in two a value lower than 0.75 was found. In these patients coronary intervention was implemented; intervention was also made in two patients on account of technical problems and inconsistent results of FFR measurements. A FFR value of 0.75 or less was found in 37 stenoses (90%) and intervention was therefore postponed. Examination and the immediate subsequent course were without complications. CONCLUSION According to initial experience FFR examination is a safe, simple and easily reproducible method. Based on the results of assessment and knowledge of the accomplished studies in the group of marginally significant stenoses in a great proportion of patients coronary intervention was postponed.
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Stöve J, Fiedler J, Huch K, Günther KP, Puhl W, Brenner R. Lipofection of rabbit chondrocytes and long lasting expression of a lacZ reporter system in alginate beads. Osteoarthritis Cartilage 2002; 10:212-7. [PMID: 11869082 DOI: 10.1053/joca.2001.0495] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Our aim was to investigate the maintenance of the transfection status of non-viral transfected chondrocytes in an alginate culture system. DESIGN Chondrocytes harvested from rabbit knees were isolated by sequential digestion and cultivated in monolayer culture. At 60-70% cell density, chondrocytes were transfected with different transfection systems (FuGENE6, CaCl2, Lipofectin). A lac Z expression vector (pcDNA 3.1/Myc-His+ lacZ) was used as a reporter system. In order to improve transfection rates, hyaluronidase (4 U/ml) was used prior and during the transfection procedure. Thereafter, transfected cells were either kept in monolayer culture or embedded in alginate beads and kept in culture for up to the next 30 weeks. RESULTS Transfection efficiency was maximal using FuGENE6TM/DNA at a ratio of 3:2 and hyaluronidase (4 U/ml). Transfection efficiency reached up to 40.8% (+/- 3.2%) after 36 h. In alginate beads lac Z positive cells declined to 8.5% +/- 3.3% after 4 weeks and to 4.6% +/- 3.2% after 12 weeks of culturing. After 30 weeks 3% of chondrocytes still expressed lac Z. In contrast, during culturing in monolayer, no lac Z expression was detectable after 4 weeks. Differentiation status of the chondrocytes was confirmed by histology and immunohistochemistry methods. CONCLUSIONS After successful gene transfer to rabbit chondrocytes the alginate system made it possible to culture lipofected chondrocytes phenotypically stable. Genetically engineered chondrocytes express the lac Z reporter gene over a period of at least 30 weeks. This transfection and culture system provides a promising tool to further investigate the over-expression of growth factors and enzyme inhibitors.
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Wolfova M, Nitter G, Wolf J, Fiedler J. Impact of crossing system on relative economic weights of traits in purebred pig populations. J Anim Breed Genet 2001. [DOI: 10.1046/j.1439-0388.2001.00304.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Zwingmann W, Fiedler J. [FMD and international trade relations--conditions and consequences]. DTW. DEUTSCHE TIERARZTLICHE WOCHENSCHRIFT 2001; 108:518-21. [PMID: 11822167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
The outbreak of foot-and-mouth disease in several member states of the European Union this year made the risks linked to this epidemic pretty clear to the public. In this connection, the possibility of vaccinations was controversially discussed not only among experts. Therefore it has to be taken into consideration that every kind of vaccination leads to economic consequences, which have to be taken into account when making such a decision. It is an illusion assuming that there will be a return to prophylactic vaccination. However in certain situations such emergency vaccination have to be available as an additional measure of control. Because of present decisions of the European Commission any consequences connected therewith are known. Thereby the EU regulations coincide with those of the Office International des Epizooties (OIE) and make the extent of restrictions after vaccination calculable. The assessment leads to the conclusion that preventive measures, rapid and successful eradication of FMD outbreaks as well as the option of emergency vaccination have to be followed as an overall conception.
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Fiedler J, Simon FR, Iwahashi M, Murphy RC. Effect of peroxisome proliferator-activated receptor alpha activation on leukotriene B4 metabolism in isolated rat hepatocytes. J Pharmacol Exp Ther 2001; 299:691-7. [PMID: 11602682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
Leukotriene B4 (LTB4) is a potent mediator of inflammation that recruits granulocytes to the site of injury during the inflammatory response. The biological activity of LTB4 is terminated by its metabolism into inactive metabolites. Recent studies have suggested that LTB4 may have additional activity as an endogenous ligand for the transcription factor peroxisome proliferator-activated receptor alpha (PPARalpha). Based on the data presented, a model was proposed in which LTB4 acts in a negative feedback manner by inducing the transcription of genes involved its own metabolism. In the present study the effect of PPARalpha activation on LTB4 metabolism was directly investigated. Primary cultures of rat hepatocytes were treated with LTB4 or the PPARalpha agonist WY-14,643, and LTB4 metabolism was assessed by measuring levels of LTB4 and the formation of LTB4 metabolites. In addition, the effect of PPARalpha activation on levels of acyl-CoA oxidase mRNA and expression of CYP4F proteins, which are specific omega-hydroxylases for LTB4, was determined. Treatment of hepatocytes with WY-14,643, but not LTB4, was found to increase acyl-CoA oxidase mRNA and enhance expression of rat hepatic CYP4F proteins and CYP4A1. Neither WY-14,643 nor LTB4 caused an increase of the basal levels of LTB4 metabolism, and no novel metabolites were observed. These results do not support the hypothesis that a pathway of negative feedback regulation of LTB4 metabolism involving PPARalpha exists in hepatocytes, because activation of PPARalpha by LTB4 or other PPARalpha agonists did not correlate with an increase in LTB4 metabolism.
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MESH Headings
- Animals
- Biotransformation
- Blotting, Northern
- Chromatography, High Pressure Liquid
- Hepatocytes/drug effects
- Hepatocytes/metabolism
- In Vitro Techniques
- Leukotriene B4/metabolism
- Male
- Microsomes, Liver/metabolism
- RNA, Messenger/biosynthesis
- RNA, Messenger/isolation & purification
- Rats
- Rats, Sprague-Dawley
- Receptors, Cytoplasmic and Nuclear/agonists
- Receptors, Cytoplasmic and Nuclear/physiology
- Spectrometry, Mass, Electrospray Ionization
- Spectrophotometry, Ultraviolet
- Transcription Factors/agonists
- Transcription Factors/physiology
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Mayr-Wohlfart U, Fiedler J, Günther KP, Puhl W, Kessler S. Proliferation and differentiation rates of a human osteoblast-like cell line (SaOS-2) in contact with different bone substitute materials. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2001; 57:132-9. [PMID: 11416860 DOI: 10.1002/1097-4636(200110)57:1<132::aid-jbm1152>3.0.co;2-k] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The aim of our study was to investigate the influence of four bone substitutes on the growth behavior of a human osteoblast-like cell line (SaOS-2) culture: pure alpha tricalcium phosphate (alpha-TCP = BIOBASE), a bioactive glass (bioglass), a neutralized glass-ceramic (GB9N), and solvent dehydrated bone. We established an in vitro cell culture model with three-dimensional scaffolds (cubes of 0.7 x 0.7 x 1.0 cm) of porous bone substitutes to investigate proliferation and differentiation rates of SaOS-2 cells. The cultures were analyzed for individual cell morphology after 5 days of growing using scanning electron microscopy. Fracture preparations of the cubes showed that cells could infiltrate the porous structures, but the cell shapes varied from individual round-shaped cells to wide spread cells and cell clusters, depending on the material. Also, the differentiation of the seeded cells was dissimilar after a 5-day incubation. The specific alkaline phosphatase (ALP) enzyme activity (ALP/DNA) measured in the supernatants of alpha-TCP-grown cells was nine times higher than the lowest activity, as observed by cells incubated on GB9N. Early (Collagen1, ALP) and late marker (osteocalcin, bone sialoprotein) of osteoblastic differentiation were proofed by reverse transcriptase-polymerase chain reaction analysis. Cells grown on bone substitutes and bioglass seem to be less differentiated than alpha-TCP-grown cells, because of noticeably less amounts of osteocalcin and bone sialoprotein. The cultivation on GB9N seems to dedifferentiate the cells, because even the ALP expression was reduced as well. Our results indicate that distinct bone substitutes influence proliferation and differentiation of osteoblastic cells in different manners. These results might influence the selection of an adequate bone substitute for clinical use as well, part from degradative and biomechanical properties.
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Saitowitz R, Hendricks M, Fiedler J, le Roux I, Hussey G, Makan B. A proposed vitamin A supplementation programme for South Africa--design, coverage and cost. S Afr Med J 2001; 91:755-60. [PMID: 11680325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023] Open
Abstract
BACKGROUND A national survey of the micronutrient status of preschool children in South Africa established that vitamin A deficiency is a significant public health problem, requiring urgent attention. A number of immediate and long-term interventions were recommended, including the introduction of a vitamin A supplementation programme and a food fortification programme. OBJECTIVES The aim of the study was to assist in the development and implementation of a national vitamin A supplementation programme at primary health care facilities for mothers and children. This was achieved by determining the design, coverage and cost of a national primary health care facility vitamin A supplementation programme. METHODS Based on an extensive review of the literature, the main components of a primary health care facility vitamin A supplementation programme were identified. The annual, recurrent costs of each of the programme components were estimated for the nine provinces in South Africa. Immunisation coverage rates were used as a proxy for estimating the coverage of the programme. RESULTS The main components of the programme were identified as: promotion, training, purchase of vitamin A capsules, distribution of vitamin A capsules to primary health care facilities, distribution of capsules to the programme beneficiaries, and monitoring and evaluation. The programme would operate from primary health care facilities and would target all children between 6 and 24 months of age and newly delivered mothers. It was estimated that the programme would cover 74% of children and 95% of postpartum women nationally. The total annual, recurrent cost of the national programme was estimated at R16.4 million. The bulk of the costs would include personnel costs, comprising 68% of the total costs. Other costs included promotion (27%), vitamin A capsules (4%) and training (1%). The cost of the programme would vary significantly by province, but the provinces' average total cost per beneficiary would be similar. CONCLUSION A primary health care facility vitamin A supplementation programme has been designed and accompanied by an estimated overall cost and coverage for implementation. The findings of the study showed that the programme would be financially feasible and would reach the majority of children under 24 months of age. It is recommended that further research be undertaken to extend the programme to the more 'hard to reach' population using other strategies such as mass immunisation campaigns.
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