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Figueira A, Monteiro A, Marques M, Carvalho A, Inácio D, Soares P, Reis T, Batel V, Pinto G. Pelvic radiotherapy: Do we really need high energy beams? Rep Pract Oncol Radiother 2013. [DOI: 10.1016/j.rpor.2013.03.611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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77
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Borrego C, Souto JA, Monteiro A, Dios M, Rodríguez A, Ferreira J, Saavedra S, Casares JJ, Miranda AI. The role of transboundary air pollution over Galicia and North Portugal area. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:2924-2936. [PMID: 23054768 DOI: 10.1007/s11356-012-1201-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 09/14/2012] [Indexed: 06/01/2023]
Abstract
In summer, high levels of ozone (O3) are frequently measured at both Galicia and Northern Portugal air quality monitoring stations, even exceeding the limit values imposed by legislation. This work aims to investigate the origin of these high O3 concentrations by the application of a chemical transport modelling system over the northwestern area of the Iberian Peninsula. The WRF-CHIMERE modelling system was applied with high resolution to simulate the selected air pollution episodes that occurred simultaneously in Galicia and North Portugal and in order to study both the contribution of local emission sources and the influence of transboundary pollution. Emission inputs have been prepared based on the development of the Portuguese and Galician emission inventories. The obtained results for O3 have been evaluated and validated against observations. Modelling results show possible contribution of the transboundary transport over the border of two neighbour regions/countries, indicating that the O3 episode starts over the urban and industrialised area of North coast of Portugal, reaching the maximum peaks over this region; at the same time, O3 levels increased over Galicia region, where lower concentrations, but still high, were observed. These results pointed out that air quality management should not be driven by political boundaries and highlight the importance of joining efforts between neighbouring countries.
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Figueira A, Monteiro A, Carvalho A, Reis T, Batel V, Alves L, Fontes P, Meireles P, Pinto G. EP-1206: Step-and-Shoot IMRT segmentation method - impact on QA and dose distribution. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)33512-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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79
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Meireles P, Figueira A, Monteiro A, Osório L, Soares A, Pinheiro J, Fontes M, Varzim P, Pinto G. EP-1046: Comparison between different forms of assessment of in-air PTV in breast irradiation with forward IMRT. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)33352-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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80
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O'Shaughnessy PJ, Monteiro A, Bhattacharya S, Fraser MJ, Fowler PA. Steroidogenic enzyme expression in the human fetal liver and potential role in the endocrinology of pregnancy. Mol Hum Reprod 2012. [PMID: 23197595 DOI: 10.1093/molehr/gas059] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The human feto-maternal unit produces large amounts of steroid hormones, particularly estrogens, during the second and third trimesters. The fetal adrenal gland and the placenta are considered the principal tissues driving steroid production but the fetal liver is likely to play an essential role in this process. This study was designed to measure transcript expression of proteins involved in steroid synthesis, metabolism, conjugation and signalling in the human fetal liver and to examine sex differences and effects of maternal smoking. Liver samples were taken from 55 normal fetuses from women undergoing second trimester elective termination. Levels of 23 mRNA transcripts encoding steroid synthesis/metabolic/conjugation enzymes and steroid receptors were measured by real-time PCR. The expression of representative proteins was confirmed by western blotting and immunohistochemistry. The human fetal livers expressed high levels of CYP19A1, SULT2A1, SULT1E1, HSD17B2, SRD5A3 and CYP3A7. Lower levels of SULT1A1, STS, UGT2B17, GPER, AKR1C3, UGT2B15, AR, CYP11A1, CYP21A2, HSD17B3, HSD17B1 and SRD5A1 were also detectable. The expression of ESR, ESR2, CYP17A1 and HSD3B transcripts was undetectable in most fetal livers, although HSD3B was shown to be present by western blotting. Sex differences were limited to SRD5A3 (lower in females) and UGT2B17 (higher in females). Maternal smoking increased the expression of CYP19A1, SULT2A1, UGT2B17, HSD17B2 and AKR1C3 and reduced the expression of SRD5A3 in the male fetal liver. This study shows that the human fetal liver is likely to have an extensive effect on circulating steroid levels in the human fetus and mother. The most important of these effects will be alterations to the species, conjugation and availability of estrogens in the fetus. Maternal smoking is likely to reduce circulating androgen bioactivity in male fetuses.
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Sandercock D, Monteiro A, Scott E, Nolan A. The effect of tail-docking neonate piglets on ATF-3 and NR2B immunoreactivity in coccygeal dorsal root ganglia and spinal cord dorsal horn neurons: Preliminary data. Scand J Pain 2012. [DOI: 10.1016/j.sjpain.2012.05.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Abstract
Background/aims
Tail docking neonatal piglets remains a controversial animal welfare issue. Although banned in the UK, it is widely practiced in many countries as a safeguard against tail biting among pigs reared in intensive systems. Concerns exist whether tail docking can induce chronic pain in later life. This preliminary study examined the effects of partial tail amputation on activating transcription factor 3 (ATF3), a marker of peripheral nerve injury and regeneration and NMDA-glutamate receptor NR2B subunit which participates in the mediation of chronic pain.
Methods
Procedures were performed according to the ethical guidelines for the study of experimental pain in animals. Six piglets (2–3 days old) were tail-docked (a portion of the tail amputated with sterile surgical cutters), six piglets (2–3 days old) were sham-docked. Three animals from each treatment were euthanised 7 and 56 days post-amputation. Coccygeal dorsal root ganglia (DRG) and spinal cord were collected post-mortem for immunohistochemistry.
Results
ATF3 immunoreactivity (IR) was significantly increased (p <0.05) in the DRG neurons from tail-docked piglets 7 days after tail amputation, compared with sham-docked piglets. ATF3-IR was not different in sham and tail-docked piglets 56 days post amputation. NR2B-IR was significantly increased (p < 0.05) in dorsal horn neurons in tail-docked piglets compared with intact piglets 7 days after docking. There was no difference in NR2B-IR in neurons 56 days post amputation, compared with intact piglets.
Conclusions
Increased ATF3 and NR2B-IR 7 days after tail-docking suggests that injury to the peripheral nerves in the tail was sufficient to trigger neuronal regeneration and altered dorsal horn signaling respectively, however the effects of tail-docking on neuronal regeneration and nociceptive signaling were relatively short lasting. Tail-docking neonatal piglets does not cause sustained changes in ATF3, which might suggest ongoing nerve fibre damage and NR2B which might be implicated in chronic pain.
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Fernandes D, Conceição C, Monteiro A, Pereira JG, Povoa P. Bacterial meningitis in the intensive care unit: a ten-year cohort study. Int J Infect Dis 2012. [DOI: 10.1016/j.ijid.2012.05.816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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83
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Monteiro A, Afolabi A, Bilgili E. Continuous production of drug nanoparticle suspensions via wet stirred media milling: a fresh look at the Rehbinder effect. Drug Dev Ind Pharm 2012; 39:266-83. [PMID: 22503097 DOI: 10.3109/03639045.2012.676048] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Nanoparticles of BCS Class II drugs are produced in wet stirred media mills operating in batch or recirculation mode with the goal of resolving the poor water-solubility issue. Scant information is available regarding the continuous production of drug nanoparticles via wet media milling. Griseofulvin and Naproxen were milled in both recirculation mode and multi-pass continuous mode to study the breakage dynamics and to determine the effects of suspension flow rate. The evolution of the median particle size was measured and described by an empirical breakage model. We found that these two operation modes could produce drug nanosuspensions with similar particle size distributions (PSDs). A reduced suspension flow rate slowed the breakage rate and led to a wider PSD and more differentiation between the two operation modes. The latter part of this study focused on the roles of stabilizers (hydroxypropyl cellulose and sodium lauryl sulfate) and elucidation of the so-called Rehbinder effect (reduction in particle strength due to adsorbed stabilizers such as polymers and surfactants). Milling the drugs in the absence of the stabilizers produced primary nanoparticles and their aggregates, while milling with the stabilizers produced smaller primary nanoparticles with minimal aggregation. Using laser diffraction, BET nitrogen adsorption, scanning electron microscopy imaging, and a microhydrodynamic analysis of milling, this study, for the first time, provides sufficient evidence for the existence of the Rehbinder effect during the milling of drugs. Not only do the polymers and surfactants allow proper stabilization of the nanoparticles in the suspensions, but they also do facilitate drug particle breakage.
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84
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Monteiro A, Strunk A, Carvalho A, Tchepel O, Miranda AI, Borrego C, Saavedra S, Rodríguez A, Souto J, Casares J, Friese E, Elbern H. Investigating a high ozone episode in a rural mountain site. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2012; 162:176-189. [PMID: 22243863 DOI: 10.1016/j.envpol.2011.11.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2011] [Revised: 10/29/2011] [Accepted: 11/08/2011] [Indexed: 05/31/2023]
Abstract
A very high ozone episode with observed hourly values above 350 μg m(-3) occurred in July 2005 at the Lamas d'Olo air quality monitoring station, located in a mountainous area in the north of Portugal. Aiming to identify the origin and formation of this ozone-rich episode, a statistical analysis and a modelling approach were applied. A cross-spectrum analysis in the frequency domain and a synoptic analysis of the meteorological and air quality time series were performed. In order to go further in this analysis, a numerical modelling approach was applied. The results indicate that the transport of ozone and its precursors is the main responsible for the high ozone concentrations. Together with the local mountain breeze and subsidence conditions, the sea-breeze circulation transporting pollutants from the coastal urban and industrialized areas that reach the site during late afternoon turn out to be the driving forces for the ozone peaks.
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85
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Brandao I, Abe K, Monteiro A, Antunes J, Formigli L, Schneider M, Martins C, Carvalho D, Oliveira I, Silva C, Kalil R. P1.21 Dystrophinopathy in girls due to X-autosome translocations. Neuromuscul Disord 2011. [DOI: 10.1016/j.nmd.2011.06.781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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86
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Pereira C, Alves C, Monteiro A, Magén C, Pereira AM, Ibarra A, Ibarra MR, Tavares PB, Araújo JP, Blanco G, Pintado JM, Carvalho AP, Pires J, Pereira MFR, Freire C. Designing novel hybrid materials by one-pot co-condensation: from hydrophobic mesoporous silica nanoparticles to superamphiphobic cotton textiles. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2289-99. [PMID: 21615151 DOI: 10.1021/am200220x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
This work reports the synthesis and characterization of mesoporous silica nanoparticles (MSNs) functionalized with tridecafluorooctyltriethoxysilane (F13) and their in situ incorporation onto cotton textiles. The hybrid MSNs and the functional textiles were prepared by a one-pot co-condensation methodology between tetraethylorthosilicate (TEOS) and F13, with hexadecyltrimethylammonium chloride (CTAC) as the template and triethanolamine as the base. The influence of the F13 to TEOS molar ratio (1:10, 1:5 and 1:3) on the nanoparticle morphology, porosity, degree of functionalization, and hydro/oleophobic properties is discussed. The hybrid nanosilicas presented high colloidal stability and were spherical and monodispersed with average particle size of ∼45 nm. They also showed high surface areas, large pore volumes, and a wormhole-type mesoporous structure. The increase in the organosilane proportion during the co-condensation process led to a more radially branched wormhole-like mesoporosity, a decrease in the surface area, pore volume, and amount of surface silanol groups, and an enrichment of the surface with fluorocarbon moieties. These changes imparted hydrophobic and oleophobic properties to the materials, especially to that containing the highest F13 loading. Cotton textiles were coated with the F13-MSNs through an efficient and less time-consuming route. The combination between surface roughness and mesoporosity imparted by the MSNs, and the low surface energy provided by the organosilane resulted in superhydrophobic functional textiles. Moreover, the textile with the highest loading of fluorocarbon groups was superamphiphobic.
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Orellana R, Monteiro A, Gidlund M, Mantesso A, Samches ER, Fonseca H. 235 CARDIOVASCULAR PARAMETERS IN HIV POSITIVE PATIENTS WITH CHRONIC PERIODONTITIS. ATHEROSCLEROSIS SUPP 2011. [DOI: 10.1016/s1567-5688(11)70236-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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88
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Santos R, Freitas J, Tejera E, Monteiro A, Lima J, Rebelo I. EFFECT OF LIFE STYLE MODIFICATION IN MENOPAUSAL WOMEN WITH OBESITY, HYPERTENSION, AUTONOMIC AND ENDOTHELIAL DYSFUNCTION. J Hypertens 2011. [DOI: 10.1097/00004872-201106001-00416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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89
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Loxley N, Monteiro A, Cooke ML, Bowen DK, Tanner BK. A Grazing Incidence X-Ray Reflectometer for Rapid Nondestructive Characterization of Thin Films and Interfaces. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-240-219] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe describe a novel instrument dedicated to making rapid angular-dispersive grazing incidence X-ray reflectivity measurements. A novel, automatic, optical technique for rapid specimen alignment, is incorporated into the control software. We discuss the information content of diffuse scattering data collected in non-standard modes. Examples of data are presented showing the application to the characterization of semiconductors and metal multilayers. The technique is shown to be particularly powerful for measurement of the thickness of epitaxial films of AlGaAs on GaAs less than 50 nm thick and where high resolution X-ray diffraction becomes impracticable. We demonstrate that, as the method is insensitive to dislocation density, high quality data can be taken rapidly from heavily relaxed multilayers. Minimum criteria for adequate information content in the data are explored and the effect of specimen curvature is examined.
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90
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O'Shaughnessy PJ, Verhoeven G, De Gendt K, Monteiro A, Abel MH. Direct action through the sertoli cells is essential for androgen stimulation of spermatogenesis. Endocrinology 2010; 151:2343-8. [PMID: 20228170 PMCID: PMC2871953 DOI: 10.1210/en.2009-1333] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Androgens act to stimulate spermatogenesis through androgen receptors (ARs) on the Sertoli cells and peritubular myoid cells. Specific ablation of the AR in either cell type will cause a severe disruption of spermatogenesis. To determine whether androgens can stimulate spermatogenesis through direct action on the peritubular myoid cells alone or whether action on the Sertoli cells is essential, we crossed hypogonadal (hpg) mice that lack gonadotrophins and intratesticular androgen with mice lacking ARs either ubiquitously (ARKO) or specifically on the Sertoli cells (SCARKO). These hpg.ARKO and hpg.SCARKO mice were treated with testosterone (T) or dihydrotestosterone (DHT) for 7 d and testicular morphology and cell numbers assessed. Androgen treatment did not affect Sertoli cell numbers in any animal group. Both T and DHT increased numbers of spermatogonia and spermatocytes in hpg mice, but DHT has no effect on germ cell numbers in hpg.SCARKO and hpg.ARKO mice. T increased germ cell numbers in hpg.SCARKO and hpg.ARKO mice, but this was associated with stimulation of FSH release. Results show that androgen stimulation of spermatogenesis requires direct androgen action on the Sertoli cells.
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91
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O'Shaughnessy PJ, Monteiro A, Verhoeven G, De Gendt K, Abel MH. Effect of FSH on testicular morphology and spermatogenesis in gonadotrophin-deficient hypogonadal mice lacking androgen receptors. Reproduction 2010; 139:177-84. [PMID: 19846485 PMCID: PMC2791495 DOI: 10.1530/rep-09-0377] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
FSH and androgen act to stimulate and maintain spermatogenesis. FSH acts directly on the Sertoli cells to stimulate germ cell number and acts indirectly to increase androgen production by the Leydig cells. In order to differentiate between the direct effects of FSH on spermatogenesis and those mediated indirectly through androgen action, we have crossed hypogonadal (hpg) mice, which lack gonadotrophins, with mice lacking androgen receptors (AR) either ubiquitously (ARKO) or specifically on the Sertoli cells (SCARKO). These hpg.ARKO and hpg.SCARKO mice were treated with recombinant FSH for 7 days and testicular morphology and cell numbers were assessed. In untreated hpg and hpg.SCARKO mice, germ cell development was limited and did not progress beyond the pachytene stage. In hpg.ARKO mice, testes were smaller with fewer Sertoli cells and germ cells compared to hpg mice. Treatment with FSH had no effect on Sertoli cell number but significantly increased germ cell numbers in all groups. In hpg mice, FSH increased the numbers of spermatogonia and spermatocytes, and induced round spermatid formation. In hpg.SCARKO and hpg.ARKO mice, in contrast, only spermatogonial and spermatocyte numbers were increased with no formation of spermatids. Leydig cell numbers were increased by FSH in hpg and hpg.SCARKO mice but not in hpg.ARKO mice. Results show that in rodents 1) FSH acts to stimulate spermatogenesis through an increase in spermatogonial number and subsequent entry of these cells into meiosis, 2) FSH has no direct effect on the completion of meiosis and 3) FSH effects on Leydig cell number are mediated through interstitial ARs.
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92
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Monteiro A, Jardini M, Alves S, Neto A, Gidlund M. Abstract: P1211 CARDIOVASCULAR DISEASE PARAMETERS IN PERIODONTITIS. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)71228-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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93
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Monteiro A, Jardini M, Gidlund M. Abstract: P1210 CARDIOVASCULAR RISK MARKERS AND PERIODONTITIS: CASE REPORT. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)70317-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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94
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Rama N, Monteiro A, Bernardo JE, Eugénio L, Antunes MJ. Lung metastases from colorectal cancer: surgical resection and prognostic factors. Eur J Cardiothorac Surg 2009; 35:444-9. [PMID: 19136273 DOI: 10.1016/j.ejcts.2008.10.047] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Revised: 10/23/2008] [Accepted: 10/28/2008] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVE To analyse our experience with excision of lung metastases from colorectal carcinoma (CRC), and to evaluate clinically relevant prognostic factors, identifying the cluster of patients who would benefit from this procedure. METHODS Sixty-one patients, 42 men (69%), with primary CRC who underwent 94 curative resections of pulmonary metastases were retrospectively reviewed. Age was 30-80 years (mean 61.2+/-15). Population was analysed for age, sex, disease-free interval (DFI), prethoracotomy carcinoembryonic antigen (CEA) level, location and histology of primary tumour, number of lung lesions (and size of largest resected metastasis), type of lung resection, nodal involvement (hilar/mediastinal), use of adjuvant treatment, morbid-mortality and immediate and follow-up survival. RESULTS Mean DFI was 29+/-22 months (range 5-132 months). There was no hospital mortality and significant morbidity occurred in five patients (8.2%). Mean follow-up was 39+/-4 months (range 4-173 months). Mean overall survival and disease-free survival were 67+/-16 months and 52+/-6 months, respectively. Three-, 5- and 10-year survival rates from date of primary colorectal resection were 83%, 71% and 43%, respectively. Three-, 5- and 10-year survival rates from date of lung resection were 61%, 48% and 11%, respectively. Five-year survival was 57% in patients with normal prethoracotomy CEA levels and 18% for those with high levels (>5 ng/ml) (p=0.039). CONCLUSIONS Pulmonary metastasectomy has potential survival benefit for patients with metastatic colorectal carcinoma. Low morbidity and mortality rates, contrasting with lack of any other effective therapy, justify aggressive surgical management. Single deposits, DFI >36 months and normal prethoracotomy serum CEA were significant independent prognostic factors.
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95
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Mcdougall C, Hui J, Monteiro A, Takahashi T, Ferrier D. Annelids in evolutionary developmental biology and comparative genomics. Parasite 2008; 15:321-8. [DOI: 10.1051/parasite/2008153321] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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96
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Abel MH, Baker PJ, Charlton HM, Monteiro A, Verhoeven G, de Gendt K, Guillou F, O'Shaughnessy PJ. Spermatogenesis and sertoli cell activity in mice lacking sertoli cell receptors for follicle-stimulating hormone and androgen. Endocrinology 2008; 149:3279-85. [PMID: 18403489 PMCID: PMC2592075 DOI: 10.1210/en.2008-0086] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Spermatogenesis in the adult male depends on the action of FSH and androgen. Ablation of either hormone has deleterious effects on Sertoli cell function and the progression of germ cells through spermatogenesis. In this study we generated mice lacking both FSH receptors (FSHRKO) and androgen receptors on the Sertoli cell (SCARKO) to examine how FSH and androgen combine to regulate Sertoli cell function and spermatogenesis. Sertoli cell number in FSHRKO-SCARKO mice was reduced by about 50% but was not significantly different from FSHRKO mice. In contrast, total germ cell number in FSHRKO-SCARKO mice was reduced to 2% of control mice (and 20% of SCARKO mice) due to a failure to progress beyond early meiosis. Measurement of Sertoli cell-specific transcript levels showed that about a third were independent of hormonal action on the Sertoli cell, whereas others were predominantly androgen dependent or showed redundant control by FSH and androgen. Results show that FSH and androgen act through redundant, additive, and synergistic regulation of spermatogenesis and Sertoli cell activity. In addition, the Sertoli cell retains a significant capacity for activity, which is independent of direct hormonal regulation.
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97
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Borrego C, Monteiro A, Ferreira J, Miranda AI, Costa AM, Carvalho AC, Lopes M. Procedures for estimation of modelling uncertainty in air quality assessment. ENVIRONMENT INTERNATIONAL 2008; 34:613-620. [PMID: 18234341 DOI: 10.1016/j.envint.2007.12.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The main objectives of this work focus, firstly, on a review of the current existent methodologies to estimate air quality modelling uncertainty, and, secondly, in the preparation of guidelines for modelling uncertainty estimation, which can be used by local and regional authorities responsible for air quality management. From the application exercise, it was concluded that it is possible to define a subset of statistical parameters able to reproduce the general uncertainties estimation. Concerning the quality indicators defined by EU directives, the results show that the legislated uncertainty estimation measures are ambiguous and inadequate in several aspects, mainly in what concerns the error measures for hourly and daily indicators based on the highest observed concentration. A relative error at the percentile correspondent to the allowed number of exceedances of the limit value was suggested and tested, showing that is a more robust and appropriate parameter for model performance evaluation.
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98
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Fischer S, Santos A, Oliveira L, Brandão S, Monteiro C, Monteiro A, Sanches E, Helfenstein T, Izar M, Gidlund M, Fonseca F. ACE-INHIBITORS AND DIURETICS REDUCE TITERS OF ANTIBODIES ANTI-OXLDL IN HYPERTENSIVE PATIENTS. ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70763-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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99
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Santos A, Fischer S, Monteiro A, Sanches E, Monteiro C, Helfenstein T, Gidlund M, Brandao S, Oliveira L, Fonseca F, Izar M. LOW TITERS OF HUMAN ANTI-OXLDL AUTOANTIBODIES ARE ASSOCIATED WITH UNSTABLE CORONARY DISEASE. ATHEROSCLEROSIS SUPP 2008. [DOI: 10.1016/s1567-5688(08)70476-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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100
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Bassini-Cameron A, Monteiro A, Gomes A, Werneck-de-Castro JPS, Cameron L. Glutamine protects against increases in blood ammonia in football players in an exercise intensity-dependent way. Br J Sports Med 2008; 42:260-6. [DOI: 10.1136/bjsm.2007.040378] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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