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Jaramillo AF, Martinez JC, Flores P, Medina C, Rojas D, Díaz-Gómez A, Fuentealba C, Meléndrez MF. Condensed tannin resins extracted from Pinus radiata bark as a support matrix in carbon nanofiber-reinforced polymers. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-020-03530-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Bolfa P, Fuentealba C, Illanes O. Virtual Pathology Rounds – A Bridge Between Pathologists, Cases, Students, Teaching and Technology. J Comp Pathol 2020. [DOI: 10.1016/j.jcpa.2019.10.047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Vera N, Gutiérrez C, Allende R, Williams P, Fuentealba C, Ávila-Stagno J. Dose–response effect of a pine bark extract on in vitro ruminal ammonia and methane formation kinetics. ACTA AGR SCAND A-AN 2019. [DOI: 10.1080/09064702.2019.1694575] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- N. Vera
- Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Chillán, Chile
| | - C. Gutiérrez
- Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Chillán, Chile
| | - R. Allende
- Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Chillán, Chile
| | - P. Williams
- Department of Animal Production, Faculty of Agronomy, Universidad de Concepción, Chillán, Chile
| | - C. Fuentealba
- Technological Development Unit, Universidad de Concepción, Coronel, Chile
| | - J. Ávila-Stagno
- Department of Animal Science, Faculty of Veterinary Sciences, Universidad de Concepción, Chillán, Chile
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Muñoz O, Fuentealba C, Ampuero D, Figuerola F, Estévez AM. The effect of Lactobacillus acidophilus and Lactobacillus casei on the in vitro bioaccessibility of flaxseed lignans (Linum usitatissimum L.). Food Funct 2018; 9:2426-2432. [PMID: 29629722 DOI: 10.1039/c8fo00390d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Secoisolariciresinol (SECO) is present in flaxseeds as a glucoside, secoisolariciresinol diglucoside (SDG), which can be metabolized to enterodiol (ED) and enterolactone (EL) by the human intestinal microbiota. The aim of this study was to evaluate the effect of Lactobacillus casei and Lactobacillus acidophilus on the bioaccessibility of flaxseed lignans from a complete in vitro digestion of whole flaxseeds (WFs) and flaxseed flour (FF). Lignans are only detected in the large intestine. The bioaccessibility of SDG for FF digestion can be ordered as follows: control (without probiotics) > L. casei > L. acidophilus; and for WF digestion, only in the presence of L. casei SDG was detected. For SECO and EL, the presence of both probiotics had no effect on FF and WF digestion. However, in the digestion of WF both L. casei and L. acidophilus increased ED bioaccessibility in the first 12 h; but both probiotics had no significant effect on FF digestion.
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Affiliation(s)
- O Muñoz
- Instituto de Ciencia y Tecnología de los Alimentos, Facultad de Ciencias Agrarias, Universidad Austral de Chile. Campus Isla Teja s/n. Valdivia, Chile
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Murray NP, Fuentealba C, Reyes E, Jacob O. A comparison of 3 on-line nomograms with the detection of primary circulating prostate cells to predict prostate cancer at initial biopsy. Actas Urol Esp 2017; 41:234-241. [PMID: 28108045 DOI: 10.1016/j.acuro.2016.10.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 10/20/2016] [Accepted: 10/21/2016] [Indexed: 11/28/2022]
Abstract
INTRODUCTION The use of nomograms which include the PSA may improve the predictive power of obtaining a prostate biopsy (PB) positive for cancer. We compare the use of three on-line nomagrams with the detection of primary malignant circulating prostate cells (CPCs) to predict the results of an initial PB in men with suspicion of prostate cancer. METHODS AND PATIENTS Consecutive men with suspicion of prostate cancer underwent a 12 core TRUS prostate biopsy; age, total serum PSA, percent free PSA, family history, ethnic origin and prostate ultrasound results were used for risk assessment using the online nomograms. Mononuclear cells were obtained by differential gel centrifugation from 8ml of blood and CPCs were identified using double immunomarcation with anti-PSA and anti-P504S. A CPC was defined as a cell expressing PSA and P504S and defined as negative/positive. Biopsies were classified as cancer/no-cancer. Areas under the curve (AUC) for each parameter were calculated and compared and diagnostic yields were calculated. RESULTS 1,223 men aged>55 years participated, 467 (38.2%) had a biopsy positive for cancer of whom 114/467 (24.4%) complied with the criteria for active observation. Area under the curve analysis showed CPC detection to be superior (p<0.001), avoiding 57% of potential biopsies while missing 4% of clinically significant prostate cancers. CONCLUSIONS The CPC detection was superior to the nomograms in predicting the presence of prostate cancer at initial biopsy; its high negative predictive value potentially reduces the number of biopsies while missing few significant cancers, being superior to the nomograms in this aspect. Being a positive/negative test the detection of CPCs avoids defining a cutoff value which may differ between populations.
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Affiliation(s)
- N P Murray
- Servicio de Medicina, Hospital de Carabineros de Chile, Santiago, Chile; Facultad de Medicina, Universidad Finis Terrae, Santiago, Chile.
| | - C Fuentealba
- Servicio de Urología, Hospital de Carabineros de Chile, Santiago, Chile
| | - E Reyes
- Servicio de Urología, Hospital DIPRECA, Santiago, Chile; Facultad de Medicina, Universidad Diego Portales, Santiago, Chile
| | - O Jacob
- Servicio de Urología, Hospital de Carabineros de Chile, Santiago, Chile
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Williamson JA, Hecker K, Yvorchuk K, Artemiou E, French H, Fuentealba C. Development and validation of a feline abdominal palpation model and scoring rubric. Vet Rec 2015. [DOI: 10.1136/vr.103212] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- J. A. Williamson
- Ross University School of Veterinary Medicine, P.O. Box 334, Basseterre, St. Kitts
- Lincoln Memorial University College of Veterinary Medicine; 6965 Cumberland Gap Pkwy Harrogate TN 37752 USA
| | - K. Hecker
- Faculty of Veterinary Medicine; University of Calgary; TRW 2D01, 3280 Hospital Drive NW Calgary Alberta Canada T2N 4Z6
| | - K. Yvorchuk
- Ross University School of Veterinary Medicine, P.O. Box 334, Basseterre, St. Kitts
| | - E. Artemiou
- Ross University School of Veterinary Medicine, P.O. Box 334, Basseterre, St. Kitts
| | - H. French
- Ross University School of Veterinary Medicine, P.O. Box 334, Basseterre, St. Kitts
| | - C. Fuentealba
- Ross University School of Veterinary Medicine, P.O. Box 334, Basseterre, St. Kitts
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Murray NP, Reyes E, Badinez L, Orellana N, Fuentealba C, Olivares R, Porcell J, Dueñas R. Effect of androgen blockade on HER-2 and matrix metalloproteinase-2 expression on bone marrow micrometastasis and stromal cells in men with prostate cancer. ScientificWorldJournal 2013; 2013:281291. [PMID: 23766685 PMCID: PMC3666220 DOI: 10.1155/2013/281291] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 04/04/2013] [Indexed: 01/22/2023] Open
Abstract
INTRODUCTION HER-2 has been associated with castrate resistant prostate cancer and matrix metalloproteinase-2 (MMP-2) in the dissemination and invasion of tumor cells as well as activating angiogenesis. We present an immunocytochemical study of the effect of androgen blockade on the expression of HER-2 and MMP-2 in bone marrow micrometastasis and the surrounding stromal cells in men with prostate cancer. METHODS AND PATIENTS A cross-sectional study of men with prostate cancer. Touch preps were obtained from bone marrow biopsies of men with prostate cancer, before and after radical prostatectomy and during androgen blockade. Micrometastasis detected with anti-PSA immunocytochemistry underwent processing with anti-HER-2 and anti-MMP-2 immunocytochemistry. Patients were defined as HER-2 positive or negative, MMP-2 negative or an MMP-2 pattern described as border or central and stromal MMP-2 defined as positive or negative. The expression of the biomarkers was compared before and after primary treatment and during androgen blockade in relation to the serum PSA at the time of sampling and duration of androgen blockade. RESULTS 191 men participated, 35 men before surgery and 43 after surgery; there were no significant differences in HER-2 expression between groups, there was no MMP-2 expression centrally or stromal expression of MMP-2. In men with androgen blockade, HER-2 expression was significantly higher; there was a trend for increasing HER-2 expression up to 5 years; central MMP-2 expression significantly increased after 3 years, while stromal MMP-2 significantly increased after 6 years. MMP-2 expression both in micrometastasis and stroma was significantly associated with HER-2 expression. Expression of MMP-2 at the border of the micrometastasis was not associated with HER-2 expression and occurred in the absence of androgen blockade. CONCLUSIONS Androgen blockade decreases serum PSA by eliminating HER-2 negative prostate cancer cells. However, there is early selection of HER-2 positive cancer cells which leads to androgen independence and to increased expression of MMP-2 activity in the micrometastasis. The increased MMP-2 activity in the micrometastasis increases the expression of MMP-2 in the surrounding stromal cells and thus could promote angiogenesis and tumor growth resulting in macrometastatic androgen independent disease.
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Affiliation(s)
- N P Murray
- Hospital de Carabineros of Chile, Simón Bolívar 2200 Ñuñoa, 7770199 Santiago, Chile.
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Murray NP, Reyes E, Tapia P, Badinez L, Orellana N, Fuentealba C, Olivares R, Dueñas R. A performance analysis of the presence of malignant circulating prostate cells as a predictive factor for the detection of prostate cancer in the first, second and third prostate biopsy. ARCH ESP UROL 2013; 66:335-341. [PMID: 23676536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
OBJECTIVES Serum prostate specific antigen and digital rectal examination are the tests used as screening tests to detect prostate cancer. However, only approximately 30% of men with suspicion of cancer have it confirmed on prostate biopsy, and not all of these need treatment. Detection of circulating tumor cells in localized prostate cancer has given variable results, but it could be a useful complementary screening tool to detect prostate cancer in men with abnormal screening tests before the evaluation with prostate biopsy. This may be more so in subsequent biopsies where serum PSA has a decreased diagnostic yield. To evaluate the diagnostic yield of the detection of CPCs as a complementary PC screening test in a population fulfilling criteria for an initial, second and third prostate biopsy for suspicion of PC. METHODS A prospective screening study of consecutive patients aged 45-80 years presenting to the urologist for PC screening. Inclusion criteria were PSA >4.0 ng/ml, PSA velocity >0.35 ng/ml/year and/or DRE suspicious for cancer. Patients fulfilling inclusion criteria had blood taken for CPC detection and then underwent 12-core transrectal prostate biopsy. Double immune-his-tochemical staining with anti-PSA and anti-P504S was used to detect CPCs. Both cytologist and pathologist were blinded to the results of the biopsy, CPC results and clinical details. The diagnostic yield of the presence or absence of CPC was evaluated; the prostate biopsy was classified as cancer or no-cancer. RESULTS 282 men participated, 83 undergoing of these undergoing a second and 38 a third biopsy, with a mean age of 66.2 ± 8.9 years and a median serum PSA of 5.10 ng/ml, 5.45 ng/ml and 6.45 ng/ml for first, second and third biopsies. Cancer was detected in 33,6%, 10.8% and 29.0% of first, second and third biopsies respectively, CPCs were detected in 36.9%, 21.7% and 36.8% of the patients. Sensibility, specificity and negative predictive value were 86% ,91% and 94% for the first biopsy, 89%, 87% and 99% for the second and 100% , 89% and 100% for third biopsy respectively. All the CPC determinations were interpretable. There were 11 false negative cases, all with small low grade tumors. Of the 29 men with a false positive CPC, 8/10 had cancer detected in the subsequent biopsy. CONCLUSIONS The use of CPC detection could be useful as a complementary prostate cancer screening test, especially for excluding cancer, and including patients with indications for repeat biopsies. Men with a false positive CPC detection had a high risk of detecting cancer in the succeeding biopsy.
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Affiliation(s)
- N P Murray
- Hospital Carabineros of Chile, Ñuñoa, Santiago, Chile.
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Liccioli S, Catalano S, Kutz S, Lejeune M, Verocai G, Duignan P, Fuentealba C, Hart M, Ruckstuhl K, Massolo A. Gastrointestinal parasites of coyotes (Canis latrans) in the metropolitan area of Calgary, Alberta, Canada. CAN J ZOOL 2012. [DOI: 10.1139/z2012-070] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Disease ecology is a relevant but relatively unexplored subject of research in urban coyotes ( Canis latrans Say, 1823). In fact, this carnivore may play a role in the circulation of parasites that can have implications on the health of humans and domestic dogs, but can also be affected by pathogens transmitted from domestic reservoirs. To investigate the gastrointestinal parasites of urban coyotes in Calgary, Alberta, Canada, we analyzed 61 carcasses and 247 fecal samples collected within the metropolitan area, including city parks, in 2009–2010. We found nine parasite taxa: Toxascaris leonina (Linstow, 1902), Uncinaria stenocephala (Railliet, 1884), Ancylostoma caninum (Ercolani, 1859), Pterygodermatites affinis (Jägerskiöld, 1904), Trichuris vulpis (Froelich, 1789), Echinococcus multilocularis Leuckart, 1863, Taenia crassiceps (Zeder, 1800), genus Giardia Kunstler, 1882, and genus Cystoisospora Frenkel, 1977. Factors related to coyote ecology, habitat characteristics, and dog management likely influence the community of coyote parasites in an urban environment, and need to be taken into account to assess the actual role of this carnivore in the maintenance of parasites in the city landscape. Further research is needed to assess the current risk for transmission of potentially zoonotic parasites (e.g., E. multilocularis, T. crassiceps, Giardia sp.) among coyotes, dogs, and humans.
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Affiliation(s)
- S. Liccioli
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive Northwest, Calgary, AB T2N 4Z6, Canada
| | - S. Catalano
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive Northwest, Calgary, AB T2N 4Z6, Canada
| | - S.J. Kutz
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive Northwest, Calgary, AB T2N 4Z6, Canada
| | - M. Lejeune
- Canadian Cooperative Wildlife Health Centre Alberta, 3280 Hospital Drive Northwest, Calgary, AB T2N 4Z6, Canada
| | - G.G. Verocai
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive Northwest, Calgary, AB T2N 4Z6, Canada
| | - P.J. Duignan
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive Northwest, Calgary, AB T2N 4Z6, Canada
| | - C. Fuentealba
- Ross University, P.O. Box 334, Basseterre, Saint Kitts, Saint Kitts and Nevis
| | - M. Hart
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive Northwest, Calgary, AB T2N 4Z6, Canada
| | - K.E. Ruckstuhl
- Department of Biological Sciences, University of Calgary, 2500 University Drive Northwest, Calgary, AB T2N 1N4, Canada
| | - A. Massolo
- Department of Ecosystem and Public Health, Faculty of Veterinary Medicine, University of Calgary, 3280 Hospital Drive Northwest, Calgary, AB T2N 4Z6, Canada
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Murray NP, Reyes E, Tapia P, Orellana N, Dueñas R, Fuentealba C, Badinez L. Diagnostic performance of malignant prostatic cells detection in blood for early detection of prostate cancer: comparison to prostatic biopsy. ARCH ESP UROL 2011; 64:961-971. [PMID: 22228894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
OBJECTIVES Serum prostate specific antigen and digital rectal examination are the tests used as screening tests to detect prostate cancer. However, only approximately 30% of men with suspicion of cancer have it confirmed on prostate biopsy, and not all of these need treatment. Detection of circulating tumor cells in localized prostate cancer has given variable results, but it could be a useful complementary screening tool to detect prostate cancer in men with abnormal screening tests before the evaluation with prostate biopsy. To evaluate the diagnostic yield of the detection of mCPC as a complementary PC screening test in a population fulfilling criteria for a prostate biopsy for suspicion of PC. METHODS A prospective screening study of consecutive patients aged 45-80 years presenting to the urologist for PC screening. Inclusion criteria were PSA >4.0 ng/ml, PSA velocity >0.35 ng/ml/year and/or DRE suspicious for cancer. Patients fulfilling inclusion criteria had blood taken for mCPC detection and then underwent 12-core transrectal prostate biopsy. Double immune-histochemical staining with anti-PSA and anti-P504S was used to detect mCPC. Both cytologist and pathologist were blinded to the results of the biopsy, mCPC results and clinical details. The diagnostic yield of the presence or absence of mCPC was evaluated; the prostate biopsy was classified as cancer or no -cancer. RESULTS 228 men participated, with a mean age of 66.8 ± 8.8 years and a median serum PSA of 5.15 ng/ml. 28.6% of the biopsies were positive for PC, and mCPC were detected in 31.0%of all cases. Sensibility, specificity and negative predictive value were 86.2%, 90.8% and 94.3% respectively. The negative and positive like-lihood ratios were 9.36 and 0.15. In men with a PSA <4.0ngml, 13.3% had cancer detected on biopsy, with a sensibility and specificity for mCPC detection of 83.3% and 84.6% and negative predictive value of 97.1%. All the mCPC determinations were interpretable. There were 9 false negative cases, all with small low grade tumors. CONCLUSIONS The use of mCPC detection could be useful as a complementary prostate cancer screening test, especially for excluding cancer, including patients with a serum PSA <4.0 ng/ml.
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Affiliation(s)
- Nigel P Murray
- Hospital de Carabineros de Chile, Santiago de Chile, Chile.
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Saavedra J, Fuentealba C, Yáñez L, Bravo M, Quiroz W, Lukacsy G, Carot J. Chemometric approaches for the zoning of Pinot Noir wines from the Casablanca valley, Chile. Food Chem 2011. [DOI: 10.1016/j.foodchem.2011.01.132] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Cuchacovich M, Soto L, Edwardes M, Gutierrez M, Llanos C, Pacheco D, Sabugo F, Alamo M, Fuentealba C, Villanueva L, Gatica H, Schiattino I, Salazaro L, Catalan D, Valenzuela O, Salazar-Onfray F, Aguillón JC. Tumour necrosis factor (TNF)alpha -308 G/G promoter polymorphism and TNFalpha levels correlate with a better response to adalimumab in patients with rheumatoid arthritis. Scand J Rheumatol 2007; 35:435-40. [PMID: 17343250 DOI: 10.1080/03009740600904284] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To investigate the influence of -308 tumour necrosis factor-alpha (TNFalpha) promoter polymorphism and circulating TNFalpha levels in the clinical response to adalimumab treatment in patients with rheumatoid arthritis (RA). METHODS Eighty-one patients with active RA were genotyped for the -308 TNFalpha polymorphism by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis and subdivided into two groups for each polymorphism (G/A and G/G genotype). All received 40 mg of adalimumab subcutaneously every other week. We compared the groups' clinical responses to adalimumab at 8, 16, and 24 weeks using the Disease Activity Score in 28 joints (DAS28). RESULTS Both groups showed a significant improvement from baseline. A significant difference between groups was found at week 24. We found that 88.2% of G/G versus 68.4% of G/A for the -308 polymorphism were DAS28 responders (p = 0.05). The score improvement at week 24 was 2.5 +/- 1.3 in the G/G group and 1.8 +/- 1.3 in the G/A group for the -308 polymorphism (p = 0.04). The median of serum TNFalpha levels of the G/A group were lower than those of the G/G group, and statistically different at weeks 8 and 24 (p < 0.039 and p < 0.043). When comparing baseline levels to those achieved at 8, 16, and 24 weeks for the whole group, only responder patients showed a statistically significant overall increase in TNFalpha over time (p < 0.000001). CONCLUSION A relationship between DAS28 improvement, the -308 G/G polymorphism, and increased circulating TNFalpha levels was found in Chilean RA patients treated with adalimumab.
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Affiliation(s)
- M Cuchacovich
- Rheumatology Section, Department of Medicine, Clinical Hospital University of Chile, Santiago.
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Aburto EM, Cribb AE, Fuentealba C. Effect of chronic exposure to excess dietary copper and dietary selenium supplementation on liver specimens from rats. Am J Vet Res 2001; 62:1423-7. [PMID: 11560272 DOI: 10.2460/ajvr.2001.62.1423] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine the effects of chronic exposure to excess dietary copper (Cu) on liver specimens from rats and the effects of dietary selenium (Se) supplementation in experimental Cu toxicosis. ANIMALS 60 weanling male Fischer 344 rats. PROCEDURE Rats were randomly assigned to 4 groups of 15 rats each and fed 1 of the following 4 diets: high Cu (500 microg/g)/adequate Se (0.2 microg/g); high Cu (500 microg/g)/supplemented Se (2 microg/g); adequate Cu (18 microg/g)/adequate Se (0.2 microg/g); or, adequate Cu (18 microg/g)/supplemented Se (2 microg/g). Five rats per group were euthanatized after 3, 6, and 12 months, and liver specimens were obtained for histologic examination, histochemistry, metal analysis by atomic absorption spectrophotometry, measurement of glutathione peroxidase activity, and assessment of lipid peroxidation, using quantification of malondialdehyde (MDA) by the thiobarbituric acid reaction. RESULTS Hepatic Cu concentration was significantly higher in rats fed high Cu diets (range, 9 to 18 microg/g of tissue [wet weight]), compared with rats receiving adequate Cu diets (4.0 to 5.7 microg/g of tissue). Rats fed high-Cu diets for 3, 6, and 12 months had mild multifocal hepatitis often surrounding necrotic foci. However, an increase in hepatic MDA content, indicative of lipid peroxidation, was not detected in these rats. Development of morphologic changes was not prevented by use of dietary Se supplementation. CONCLUSION AND CLINICAL RELEVANCE Long-term exposure to excess dietary Cu caused mild hepatic lesions in Fischer 344 rats. Dietary Se supplementation did not prevent hepatic damage in rats with Cu toxicosis.
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Affiliation(s)
- E M Aburto
- Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Canada
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Pacheco D, Alvarez ME, Vizcarra G, Fuentealba C, Marinovic MA, Ballesteros F. [Characteristics of hospitalization of patients with rheumatic diseases admitted to a tertiary care hospital]. Rev Med Chil 2001; 129:653-9. [PMID: 11510206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
BACKGROUND The diagnostic profile of patients with rheumatic diseases admitted to a general hospital is variable. AIM To report the epidemiological profile of patients with rheumatic diseases admitted to a tertiary care hospital. MATERIAL AND METHODS All admissions to a Medicine ward of a general hospital and seen by the Rheumatology team were prospectively registered during one year in 1999. Patients were classified as primarily admitted for a rheumatic disease or admitted for other cause that required a consultation with the Rheumatology team. RESULTS One hundred forty five admissions due to rheumatic diseases were registered. Of these, 82 were due to primary rheumatic diseases. Systemic lupus erythematosus, rheumatoid arthritis and vasculitis were the main diagnoses and the mean hospital stay was 18.5 days. Sixty three patients required a consultation with the Rheumatology team specially due to osteoarthritis and crystal induced diseases. CONCLUSIONS Admissions due to rheumatic diseases are prolonged, correspond to 0.46% of all admissions and the main responsible disease is systemic lupus erythematosus.
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Affiliation(s)
- D Pacheco
- Departamento de Reumatología Hospital Clínico San Borja-Arriarán, Facultad de Medicina Universidad de Chile
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Mc-Nab P, Fuentealba C, Ballesteros F, Pacheco D, Alvarez M, Dabanch J, Cona E. [Nocardia asteroides infection in a patient with systemic lupus erythematosus]. Rev Med Chil 2000; 128:526-8. [PMID: 11008357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Nocardia asteroides infection are unusually observed in systemic Lupus erithematous (SLE) patients. They are generally associated to steroidal and immunosuppressive therapy. We report a 24 years old female with SLE diagnosed in 1994 who developed a severe preeclampsia in her first pregnancy requiring emergency caesarean section. Post partum acute renal failure and type IV lupus nephropathy were treated with hemodialysis, methylprednisolone, cyclophosphamide and prednisone. Three months later, while she was receiving the fourth cyclophosphamide dose, she presented with a pleuro pneumonia and occipital abscess, both caused by Nocardia asteroides. She was treated with cotrimoxazole + cefixime and pleural decortication was required. Five months later, she developed Meningitis caused by Nocardia asteroides and hydrocephalus. She was treated with ceftriaxone, vancomycin, cotrimoxazole and ventricular shunting procedure. Two months later, a retroperitoneal abscess was diagnosed and surgically drained but the patient died, due to a methicillin-resistant Staphylococcus aureus septicemia.
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Affiliation(s)
- P Mc-Nab
- Hospital San Borja-Arriarán, Departamento Medicina, Universidad de Chile.
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Pacheco D, Berdichevsky R, Ballesteros F, Jérez J, Sobarzo E, Fuentealba C, Pino C, Sanhueza R, Estefan ME, Medina C. [Education of patients with rheumatoid arthritis. Assessment of a survey of interests]. Rev Med Chil 1998; 126:188-94. [PMID: 9659755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND The congruence of interests between health care providers and clients is essential if subjects with chronic diseases will be educated. AIM To assess, in patients with rheumatoid arthritis, those fields in which they would like to receive education. PATIENTS AND METHODS Eighty eight patients with rheumatoid arthritis were surveyed about the topics in which they would like to be educated. The inquiry included medical aspects, handicap overcoming, social issues and labor aspects. RESULTS Eighty two percent of patients were interested in medical aspects, 77% in social issues and 71% in handicap overcoming. Eighty three percent of patients with greater handicaps preferred handicap overcoming, 75% social aspects and 74% medical aspects. Younger patients had a greater interest in labor aspects, those with a recently diagnosed disease were interested in their legal rights and those with a prolonged disease wanted information about self help groups. CONCLUSIONS The greater educational interests of patients with rheumatoid arthritis were on medical aspects. However, those impaired by the disease were interested in handicap overcoming. Age and duration of the disease also influenced the educational interests of patients. Thus, education in these patients must be individualized.
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Affiliation(s)
- D Pacheco
- Departamento de Reumatología, Hospital Clínico San Borja-Arriarán, Universidad de Chile, Santiago, Chile.
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Fuentealba C, Guest S, Haywood S, Horney B. Chronic hepatitis: a retrospective study in 34 dogs. Can Vet J 1997; 38:365-73. [PMID: 9187802 PMCID: PMC1576879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The aims of this study were to characterize the histological changes observed in 34 accessioned cases of canine chronic hepatitis and to correlate these changes with the clinical pathological data. Cases of chronic hepatitis were subdivided into 6 categories: chronic active hepatitis (10/34), chronic persistent hepatitis (7/32), chronic cholestatic hepatitis (6/34), fibrosing hepatitis with cirrhosis (3/34), chronic cholangiohepatitis (3/34), and miscellaneous secondary hepatitis (5/34). Iron accumulation was a consistent finding in all livers examined. Although all cases of chronic hepatitis had elevated liver enzymes, no correlation was detected between biochemical parameters and the severity of morphologic changes. Similarly, no correlation was detected between rhodanine staining for copper and morphologic or biochemical indicators of cholestasis. However, presence of copper correlated well with reticulo-fibrosis (r = 0.8) and bile duct hyperplasia, suggesting that changes in the hemodynamics of the hepatic acini due to fibrosis could influence storage of copper.
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Affiliation(s)
- C Fuentealba
- Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Prince Edward Island
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Almendras FE, Jones SR, Fuentealba C, Wright GM. In vitro infection of a cell line from Ictalurus nebulosus with Piscirickettsia salmonis. Can J Vet Res 1997; 61:66-8. [PMID: 9008805 PMCID: PMC1189373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Piscirickettsia salmonis, the etiologic agent of salmonid rickettsial septicemia (SRS), affects several species of salmonids. Previous reports using the appearance of cytopathic effect (CPE) as the criterion for susceptibility, showed that Piscirickettsia salmonis (ATCC strain) can be grown in vitro in some cells lines derived from salmonid fish, but not in BB cells from brown bullhead (Ictalurus nebulosus) and BF-2 cells from bluegill (Lepomis macrochirus). In this study we describe growth of P. salmonis (ATCC strain VR 1361) in a cell line previously believed to be nonpermissive for this organism. CPE was first detected in chinook salmon embryo (CHSE-214) and epithelioma papulosum ciprini (EPC) cell lines at 6 d postinfection (dpi). In contrast, using BB cell line, CPE was first detected 45 dpi and the monolayer completed CPE by 78 dpi. Electron microscopic examination of BB cells 78 dpi revealed free, intracytoplasmic and extracellular localization of the agent. P. salmonis was also observed within membrane-bounded vacuoles in BB cells, similar to that described in CHSE 214 cells. Contrary to earlier reports, results from the present study show that the BB cell line, is susceptible to Piscirickettsia salmonis infection. The delayed onset of CPE in BB cells in comparison to other permissive cell lines suggests that BB cells are not ideal hosts for P. salmonis. Interestingly, however, these results demonstrate that P. salmonis can infect non-salmonid cell lines, and raises the possibility that non-salmonid fish may play a role in the persistence and transmission of SRS in the natural environment.
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Affiliation(s)
- F E Almendras
- Department of Pathology & Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown
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Fuentealba C, Hanna P. Mange induced by Trixacarus caviae in a guinea pig. Can Vet J 1996; 37:749-50. [PMID: 9111699 PMCID: PMC1576682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- C Fuentealba
- Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown
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Pacheco D, Berdichevsky R, Ballesteros F, Fuentealba C, Arinoviche R, Jérez J. [Impact of an educational manual on knowledge and attitudes of rheumatic patients and health care workers]. Rev Med Chil 1996; 124:1071-6. [PMID: 9197020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Education may induce voluntary behavioral changes in patients that lead to an improvement in health status. AIM To assess the impact of the educational manual "Aches and Pain" on knowledge and attitudes of patients with chronic rheumatism and paramedics, using an instrument with 40 asseverations extracted from the manual. PATIENTS AND METHODS Seventy seven patients and 42 paramedics were studied. The assessment instrument was responded before and after reading chapters of the manual, selected by the authors. Knowledge was quantified according to the number of correct answers. Adaptation to disease, optimism and self help capacity were the evaluated attitudes, using a five point scale. RESULTS The study was completed by 48 patients and 42 paramedics. Knowledge improved from 19.9 +/- 5.3 to 25.6 +/-6.15 correct answers in the former and from 23.6 +/- 4.9 to 30.3 +/- 5.5 in the latter (p < 0.001). In patients there were improvements in the degree of adaptation to disease from 3.6 +/- 0.9 to 4.0 +/- 0.8 and in self-help capacity from 4.0 +/- 0.8 to 4.3 +/- 0.8; optimism did not improve significantly. CONCLUSIONS The educational manual had an impact on knowledge and improved rheumatic patient's attitudes towards the disease.
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Affiliation(s)
- D Pacheco
- Departamento de Reuinatología, Hospital Clínico San Borja-Arriarán, Universidad de Chile, Santiago de Chile
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Yanoff SR, Fuentealba C, Boothe HW, Rogers KS. Tracheal defect and embryonal rhabdomyosarcoma in a young dog. Can Vet J 1996; 37:172-3. [PMID: 8681290 PMCID: PMC1576635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- S R Yanoff
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, Texas A&M University, College Station 77843, USA
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Affiliation(s)
- A P Adams
- Department of Health Management, University of Prince Edward Island, Charlottetown, Prince Edward Island
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Fuentealba C, Blue-McLendon A. Liposarcoma arising from the mandibular bone marrow in a ferret. Can Vet J 1995; 36:779-80. [PMID: 8748452 PMCID: PMC1687074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- C Fuentealba
- Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown
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Wicher V, Baughn RE, Fuentealba C, Shadduck JA, Abbruscato F, Wicher K. Enteric infection with an obligate intracellular parasite, Encephalitozoon cuniculi, in an experimental model. Infect Immun 1991; 59:2225-31. [PMID: 1904839 PMCID: PMC257999 DOI: 10.1128/iai.59.7.2225-2231.1991] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Rabbits were intrarectally infected with 3 doses (5 x 10(3), 5 x 10(5), and 5 x 10(7] of an obligate intracellular parasite, Encephalitozoon cuniculi, with or without prior colonic lavages. Although chronic administration of enemas seems to interfere to some degree with the intestinal translocation of the parasite, systemic infection was observed in both manipulated and nonmanipulated animals. The animals responded with antibodies of immunoglobulin A (IgA) and IgG isotypes, reflecting the route of infection. They also produced significant amounts of circulating immune complexes composed of IgA and IgG antibodies and E. cuniculi antigens. Lesions compatible with encephalitozoonosis were seen in the liver, kidney, lung, and brain. In all instances, nonmanipulated animals had more severe lesions than manipulated rabbits given the same dose of parasites. Levels of serum antibodies, circulating immune complexes, and histopathologic changes were associated with the infection dose. The presented data suggest that human microsporidiosis may also be transmitted via the rectal route. It is, therefore, of clinical relevance in view of several reports of microsporidian infections in patients with acquired immunodeficiency.
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Affiliation(s)
- V Wicher
- Wadsworth Center for Laboratories and Research, New York State Department of Health, Albany 12201-0509
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Florenzano R, Pemjean A, Orpinas P, Feuerhake O, Fuentealba C, Valdés M, Manzi J. [Teaching of alcoholism in Chilean medical schools: a curriculum survey]. Rev Med Chil 1985; 113:1188-93. [PMID: 3837303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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