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Batista M, Moreno C, Vilar J, Golding M, Brito C, Santana M, Alamo D. Neonatal viability evaluation by Apgar score in puppies delivered by cesarean section in two brachycephalic breeds (English and French bulldog). Anim Reprod Sci 2014; 146:218-26. [PMID: 24703805 DOI: 10.1016/j.anireprosci.2014.03.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Revised: 02/17/2014] [Accepted: 03/12/2014] [Indexed: 11/15/2022]
Abstract
This study tried to define neonatal viability after cesarean section in brachycephalic breeds and the efficacy of an adapted Apgar test to assess newborn survival. Data from 44 cesarean sections and 302 puppies were included. Before surgery (59-61 days after ovulation), an ultrasound evaluation defined the fetal biparietal diameter (BPD). Immediately after the uterine delivery, the pups were evaluated to detect birth defects and then, a modified Apgar score (range: 0-10) was used to define neonatal health at 5min (Apgar 1) and 60min (Apgar 2) after neonatal delivery; puppies were classified into three categories: critical neonates (score: 0-3), moderate viability neonates (score: 4-6) and normal viability neonates (score: 7-10). Mean (±SEM) value of BPD was 30.8±0.1mm and 28.9±0.1mm in English and French Bull-Dog fetus, respectively. The incidence of spontaneous neonatal mortality (4.98%, 14/281) and birth defects (6.95%) were not influenced by the sex; however, congenital anomalies and neonatal mortality were higher (p<0.01) in those litters with a greater number of neonates. In Apgar 1, the percentage of critical neonates, moderate viability neonates and normal viability neonates were 20.5%, 46.3% and 33.1% respectively; sixty minutes after birth, the critical neonates only represented 10.3% of the total puppies. Almost all neonates (238/239) showing moderate or normal viability at Apgar 1, survived for the first 24h after birth. The results of the study showed a direct relationship (p<0.01) between the Apgar score and neonatal viability. Therefore, the routine performance of the Apgar score would appear to be essential in the assessment of the status of brachycephalic breed puppies.
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Stavroullakis A, Brito C, Li K, Carrilho M, Pashley D, Prakki A. Cytokine secretion screening of odontoblasts treated with chlorhexidine and epigallocatechin-gallate. Dent Mater 2014. [DOI: 10.1016/j.dental.2014.08.302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Resende C, Araujo C, Duarte ML, Brito C. Rapidly lethal dermatomyositis associated with cutaneous lymphangitis carcinomatosa. CASE REPORTS 2013; 2013:bcr-2013-010376. [DOI: 10.1136/bcr-2013-010376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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29
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Kalla Singh S, Brito C, Tan QW, De León M, De León D. Differential expression and signaling activation of insulin receptor isoforms A and B: A link between breast cancer and diabetes. Growth Factors 2011; 29:278-89. [PMID: 21913804 PMCID: PMC3205219 DOI: 10.3109/08977194.2011.616200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We showed that when insulin-like growth factor II (IGF-II) is highly expressed in breast tissues and cell lines, the IGF-I receptor signaling pathway is highly activated. Since IGF-II activates the insulin receptor (INSR), we propose that the INSR signaling is also activated in this system. We examined the expression of both INSR isoforms, insulin receptor A (INSR-A) and insulin receptor B (INSR-B), and the downstream signaling pathways in breast cancer (BC) cells and in paired (normal/tumor) breast tissues from 100 patients. Analysis was performed by real-time PCR, Western blot, immunohistochemistry, and phospho-ELISA techniques. Tumor tissues and cell lines from African-American patients expressed higher levels of INSR-A, but lower levels of INSR-B. Accordingly, insulin receptor substrate 1 and focal adhesion kinase activation were significantly increased in these women. We conclude that higher INSR-A and lower INSR-B contribute to higher proliferation and lower metabolic response. Thus, differential expression of INSR isoforms represents a potential biological link between BC and diabetes.
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Gomes J, Pereira T, Carvalho A, Brito C. Primary cutaneous actinomycosis caused by Actinomyces meyeri as first manifestation of HIV infection. Dermatol Online J 2011; 17:5. [PMID: 22136861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
Primary cutaneous actinomycosis is very uncommon. We report a patient with cutaneous actinomycosis with multiple lesions without any detectable extra-cutaneous lesions. In our patient the actinomycosis was the presenting manifestation of HIV infection.
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Gomes J, Pereira T, Carvalho A, Brito C. Primary cutaneous actinomycosis caused by as first manifestation of HIV infection. Dermatol Online J 2011. [DOI: 10.5070/d30n05580m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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32
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Richardson AE, Hamilton N, Davis W, Brito C, De León D. Insulin-like growth factor-2 (IGF-2) activates estrogen receptor-α and -β via the IGF-1 and the insulin receptors in breast cancer cells. Growth Factors 2011; 29:82-93. [PMID: 21410323 PMCID: PMC3092021 DOI: 10.3109/08977194.2011.565003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The estrogen receptor (ER) is a primary target for breast cancer (BC) treatment. As BC progresses to estrogen-independent growth, the insulin-like growth factor-1 receptor (IGF-1R) and the ER interact in synergistic cross-talk mechanisms, which result in enhanced activation of both receptors' signaling cascades. Insulin-like growth factor-2 (IGF-2) is critical in BC progression and its actions are mediated by the IGF-1R. Our previous studies showed that IGF-2 regulates survival genes that protect the mitochondria and promote chemoresistance. In this study, we analyzed BC cells by subcellular fractionation, Western-Blot, qRT-PCR, and siRNA analysis. Our results demonstrate that IGF-2 activates ER-α and ER-β, and modulates their translocation to the nucleus, membrane organelles, and the mitochondria. IGF-2 actions are mediated by the IGF-1R and the insulin receptor. This novel mechanism of IGF-2 synergistic cross-talk signaling with ER-α and ER-β can promote estrogen-independent BC progression and provide new therapeutic targets for the treatment of BC patients.
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Kalla Singh S, Tan QW, Brito C, De León M, De León D. Insulin-like growth factors I and II receptors in the breast cancer survival disparity among African-American women. Growth Horm IGF Res 2010; 20:245-254. [PMID: 20347606 PMCID: PMC2875325 DOI: 10.1016/j.ghir.2010.03.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Revised: 02/02/2010] [Accepted: 03/02/2010] [Indexed: 12/14/2022]
Abstract
OBJECTIVE African-American (AA) women with breast cancer are more likely to have advanced disease at diagnosis, higher risk of recurrence and poorer prognosis than Caucasian (CA) women. We have recently shown higher insulin-like growth factor II (IGF-II) expression in paired breast tissue samples from AA women as compared to CA women. IGF-II is a potent mitogen that induces cell proliferation and survival signals through activation of the IGF-I and Insulin receptors (IGF-IR, IR) while IGF-II circulating levels are regulated by cellular uptake through the IGF2 receptor. We hypothesize that differential expression of the IGF1R and IGF2R among AA and CA women potentiates IGF-II mitogenic effects, thus contributing to the health disparity observed between these ethnic groups. DESIGN We examined IGF-IR and IGF2R mRNA, protein expression and IGF1R phosphorylation in paired breast tissue samples from AA and CA women by Real Time-PCR, Western blot analysis, immunohistochemistry and ELISA techniques. RESULTS Our results showed significantly increased expression of IGF1R in AA normal tissues as compared to CA normal tissues. IGF1R expression was similar between AA normal and malignant tissues, while IGF1R, IRS-1 and Shc phosphorylation was significantly higher in AA tumor samples. Significantly higher levels of IGF2R were found in CA tumor samples as compared to AA tumor samples. CONCLUSIONS We conclude that IGF1R and IGF2R differential expression may contribute to the increased risk of malignant transformation in young AA women and to the more aggressive breast cancer phenotype observed among AA breast cancer patients and represent, along with IGF-II, potential therapeutic targets in breast cancer.
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MESH Headings
- Adult
- Black or African American/genetics
- Aged
- Aged, 80 and over
- Breast Neoplasms/genetics
- Breast Neoplasms/mortality
- Carcinoma, Ductal, Breast/ethnology
- Carcinoma, Ductal, Breast/genetics
- Carcinoma, Ductal, Breast/mortality
- Carcinoma, Papillary/ethnology
- Carcinoma, Papillary/genetics
- Carcinoma, Papillary/mortality
- Female
- Gene Expression Regulation, Neoplastic
- Genetic Predisposition to Disease
- Health Status Disparities
- Humans
- Middle Aged
- RNA, Messenger/metabolism
- Receptor, IGF Type 1/genetics
- Receptor, IGF Type 2/genetics
- White People/genetics
- Young Adult
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Kalla Singh S, Tan QW, Brito C, De León M, Garberoglio C, De León D. Differential insulin-like growth factor II (IGF-II) expression: A potential role for breast cancer survival disparity. Growth Horm IGF Res 2010; 20:162-170. [PMID: 20089431 PMCID: PMC2885869 DOI: 10.1016/j.ghir.2009.12.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Revised: 12/09/2009] [Accepted: 12/10/2009] [Indexed: 11/23/2022]
Abstract
OBJECTIVE Increased risk of cancer and other adult diseases have been associated with perinatal exposure to adverse conditions such as stress and famine. Recently, Insulin-like growth factor II (IGF-II) was identified as the first gene associated with altered expression caused by fetal exposure to poor nutrition. IGF-II regulates fetal development and breast cancer cell survival, in part, by regulating anti-apoptotic proteins through activation of the IGF-I and insulin receptors. African-American (AA) women have a lower overall breast cancer (BC) incidence, however, they present with advanced disease at diagnosis, poorer prognosis and lower survival than Caucasian (CA) women. The reasons for the BC survival disparity are not well understood. We hypothesize that IGF-II plays a role in the survival disparity observed among AA breast cancer patients by stimulating rapid tumor growth, inhibiting apoptosis, and promoting metastasis. DESIGN This study examines IGF-II expression and regulation of the anti-apoptotic proteins Bcl-2, Bcl-X(L), and survivin in Hs578t (ER-), CRL 2335 (ER-), and CRL 2329 (ER+) breast cancer cells and compares with the expression of these proteins in paired breast tissue samples from AA and CA women by qRT-PCR and Western blotting. RESULTS IGF-II expression was significantly higher in AA cell lines and tissue samples when compared to Caucasians. IGF-II siRNA treatment decreased anti-apoptotic protein levels in all cell lines (regardless of ER status). These effects were blocked by the addition of recombinant IGF-II. Of significance, IGF-II expression and regulation of Bcl-X(L) and survivin in cell lines correlated with their expression in paired breast tissues. CONCLUSIONS IGF-II and the anti-apoptotic proteins differential expression among AA and CA patients may contribute to the breast cancer survival disparities observed between these ethnic groups.
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Rocha J, Luz Duarte M, Marques H, Torres F, Tavares P, Silva A, Brito C. Association of adult mastocytosis with M541L in the transmembrane domain of KIT. J Eur Acad Dermatol Venereol 2010; 24:1118-9. [PMID: 20236206 DOI: 10.1111/j.1468-3083.2010.03599.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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36
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Vilarinho C, Ventura F, Brito C. Methotrexate for refractory HaileyâHailey disease. J Eur Acad Dermatol Venereol 2010; 24:106. [DOI: 10.1111/j.1468-3083.2009.03360.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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37
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Ventura F, Rocha J, Fernandes JC, Pardal F, Brito C. Topical Imiquimod Treatment of Lentigo Maligna. Case Rep Dermatol 2009; 1:78-81. [PMID: 20652120 PMCID: PMC2895216 DOI: 10.1159/000249151] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Lentigo maligna (LM) is the in situ phase of lentigo maligna melanoma, which may progress to invasive melanoma if left untreated. It mainly occurs on sun-exposed areas of elderly patients. The lesions can be large and conventional surgery can be difficult, particularly on the face. Recent reports indicate that topical imiquimod 5% cream is effective in the treatment of LM. It may be an alternative when surgery or other classical treatments are not possible in elderly patients. We describe an 80-year-old Caucasian woman with a 10-year history of a histologically verified extensive LM of the face. She was treated with imiquimod 5% cream once daily. After four months it showed complete clinical response. One year after the treatment the patient was still free from recurrence.
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Escrevente C, Machado E, Brito C, Reis CA, Stoeck A, Runz S, Marmé A, Altevogt P, Costa J. Different expression levels of alpha3/4 fucosyltransferases and Lewis determinants in ovarian carcinoma tissues and cell lines. Int J Oncol 2006; 29:557-66. [PMID: 16865271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023] Open
Abstract
Ovarian carcinoma is the leading cause of death from gynecological cancers in many countries. Fucosylated glycoconjugates have been associated with various carcinomas. In the present study, we have characterized the expression of alpha3/4 fucosyltransferases transcripts and their products, the Lewis carbohydrate determinants, and their in vitro specificity towards synthetic acceptors using ovarian carcinoma cell lines OVM, m130, GG and SKOV3. We found different expression patterns: GG cells expressed mostly Lewisx (Lex), Lewisy (Ley), sLea and Leb, and m130 cells expressed mostly Lex and Ley. The detection was on the plasma membrane and in intracellular vesicles. OVM and SKOV3 cells had very low amounts of staining. From RT-PCR studies, enzyme specificity of cellular extracts towards a panel of synthetic carbohydrate acceptors and Western blot analysis we concluded that Lea, sLea and Leb were synthesised by FUT3, whereas Lex and Ley were synthesized by FUT4 and FUT9 in both cell lines. The GG and m130 cell lines are adequate models to investigate the role of Lex, Ley, sLea and Leb in ovarian carcinoma development.
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MESH Headings
- Adenocarcinoma, Mucinous/genetics
- Adenocarcinoma, Mucinous/metabolism
- Adenocarcinoma, Mucinous/pathology
- Blotting, Western
- Carcinoma, Papillary/genetics
- Carcinoma, Papillary/metabolism
- Carcinoma, Papillary/pathology
- Cystadenocarcinoma, Serous/genetics
- Cystadenocarcinoma, Serous/metabolism
- Cystadenocarcinoma, Serous/pathology
- Female
- Fucose/metabolism
- Fucosyltransferases/genetics
- Fucosyltransferases/metabolism
- Gene Expression Regulation, Neoplastic
- Humans
- Lectins/metabolism
- Lewis Blood Group Antigens/genetics
- Lewis Blood Group Antigens/metabolism
- Microscopy, Fluorescence
- Ovarian Neoplasms/genetics
- Ovarian Neoplasms/metabolism
- Ovarian Neoplasms/pathology
- Reverse Transcriptase Polymerase Chain Reaction
- Tumor Cells, Cultured
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39
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Escrevente C, Machado E, Brito C, Reis C, Stoeck A, Runz S, Marmé A, Altevogt P, Costa J. Different expression levels of α3/4 fucosyltransferases and Lewis determinants in ovarian carcinoma tissues and cell lines. Int J Oncol 2006. [DOI: 10.3892/ijo.29.3.557] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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40
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Lourenco P, Brito C, Backeljau T, Thierry D, Ventura MA. Molecular systematics of the Chrysoperla carnea group (Neuroptera: Chrysopidae) in Europe. J ZOOL SYST EVOL RES 2006. [DOI: 10.1111/j.1439-0469.2006.00352.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Barth-Jones DC, Cheng H, Kang LY, Kenya PR, Odera D, Mosqueira NR, Mendoza W, Portela MC, Brito C, Tangcharoensathien V, Akaleephan C, Supantamart S, Patcharanarumol W, de Macedo Brigido LF, Fonseca MGP, Sanchez M, Chang ML, Osmanov S, Avrett S, Esparza J, Griffiths U. Cost effectiveness and delivery study for future HIV vaccines. AIDS 2005; 19:w1-6. [PMID: 16103763 DOI: 10.1097/01.aids.0000181014.08127.a7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Research teams from five countries, Brazil, China, Kenya, Peru and Thailand, have initiated a policy-maker survey on vaccine delivery, cost studies for future HIV vaccination programmes, and associated simulation modeling exercises analysing the relative cost-effectiveness of potential HIV vaccination strategies. The survey assesses challenges and opportunities for future country-level HIV vaccination strategies, providing data on the vaccine characteristics (e.g. vaccine efficacies for susceptibility, infectiousness and disease progression) and vaccination programme strategies to be considered in the cost-effectiveness modeling analyses. The study will provide decision-makers with modeling data on vaccination policy considerations that will assist in developing country-level capacities for future HIV vaccine policy adoption and effective delivery systems, and will help delineate the long-term financial requirements for sustainable HIV vaccination programmes. The WHO-UNAIDS HIV Vaccine Initiative and the collaborating researchers welcome comments or questions from policy makers, health professionals and other stakeholders in the public and private sectors about this effort to help advance policy and capacity related to future potential HIV vaccines.
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Sousa VL, Brito C, Costa J. Deletion of the cytoplasmic domain of human α3/4 fucosyltransferase III causes the shift of the enzyme to early Golgi compartments. Biochim Biophys Acta Gen Subj 2004; 1675:95-104. [PMID: 15535972 DOI: 10.1016/j.bbagen.2004.08.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2004] [Revised: 07/26/2004] [Accepted: 08/20/2004] [Indexed: 11/17/2022]
Abstract
The transmembrane domain (TM) and flanking regions of glycosyltransferases (GTs) have been implicated in the localization of these proteins in the Golgi apparatus (GA). alpha3/4 Fucosyltransferase III (FT3wt) (EC 2.4.1.65) is localized in the trans-Golgi and trans-Golgi network (TGN) of baby hamster kidney (BHK) cells and synthesizes Lewis determinants associated with cell adhesion events. We have evaluated the effect of removing the cytosolic domain on the localization of the enzyme and its capacity for synthesizing the Lewis A (Le A) determinant. The mutant where the cytoplasmic domain (Asp-2 to Trp-13) of FT3wt has been deleted (FT3dc) was localized in the Golgi but it was shifted to earlier compartments than FT3wt. The mutant was not detected on the plasma membrane (PM) and glycosylation analysis indicated that FT3dc was transported beyond the endoplasmic reticulum (ER) since complex type glycosylation was observed. Cells expressing FT3dc showed a significantly lower efficiency to synthesize Le A when compared with cells expressing FT3wt, in vivo. This reduction was not due to lower specific activity because both enzyme forms had a similar specific activity in vitro. Therefore, removal of FT3 cytosolic tail caused a shift in enzyme distribution to earlier Golgi compartments concomitant to the decrease of its biosynthetic capacity.
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Molina LH, Casanova M, Gonzalez LA, Pinto M, Carrasco E, Brito C. Identification of the genetic variants of kappa-casein in milk by isoelectric focusing electrophoresis. INT J DAIRY TECHNOL 2003. [DOI: 10.1046/j.1471-0307.2003.00102.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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44
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Tiscornia AC, Cayota A, Landoni AI, Brito C, Oppezzo P, Vuillier F, Robello C, Dighiero G, Gabús R, Pritsch O. Post-transcriptional regulation of inducible nitric oxide synthase in chronic lymphocytic leukemia B cells in pro- and antiapoptotic culture conditions. Leukemia 2003; 18:48-56. [PMID: 14574328 DOI: 10.1038/sj.leu.2403169] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Functional inducible NOS (iNOS) may be involved in the prolonged lifespan of chronic lymphocytic leukemia cells (B-CLL), although the exact mechanisms implicated remain elusive as yet. In this work, we have examined iNOS expression in normal B lymphocytes and B-CLL cells in pro- and antiapoptotic conditions. Our results demonstrate: (1) The existence of a new splice variant characterized by a complete deletion of exon 14 (iNOS 13-16(14del)), which was preferentially detected in normal B lymphocytes and may represent an isoform that could play a role in the regulation of enzyme activity. (2) The existence of another alternatively spliced iNOS mRNA transcript involving a partial deletion of the flavodoxin region (iNOS 13-16(neg)) was correlated to a decreased B-CLL cell viability. The 9-beta-D-arabinofuranosyl-2-fluoradenine or fludarabine (F-ara) treatment induced iNOS 13-16(neg) transcript variants, whereas IL-4 enhanced both the transcription of variants, including these exons (iNOS 13-16(pos)), and the expression of a 122 kDa iNOS protein. These results suggest that in B-CLL, a regulation process involving nitric oxide (.- NO) levels could occur by a post-transcriptional mechanism mediated by soluble factors. Our results also provide an insight into a new complementary proapoptotic action of F-ara in B-CLL by the induction of particular iNOS splice variants, leading to the activation of a caspase-3-dependent apoptotic pathway.
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MESH Headings
- Aged
- Aged, 80 and over
- Alternative Splicing
- Antineoplastic Agents/pharmacology
- Apoptosis/physiology
- B-Lymphocytes/enzymology
- Base Sequence
- Caspase 3
- Caspases/metabolism
- DNA (Cytosine-5-)-Methyltransferases/antagonists & inhibitors
- Female
- Gene Expression Regulation, Enzymologic
- Gene Expression Regulation, Leukemic
- Humans
- Interleukin-4/pharmacology
- Isoenzymes
- Leukemia, Lymphocytic, Chronic, B-Cell/enzymology
- Male
- Middle Aged
- Molecular Sequence Data
- Nitric Oxide/physiology
- Nitric Oxide Synthase/genetics
- Nitric Oxide Synthase Type II
- RNA Processing, Post-Transcriptional
- RNA, Messenger/metabolism
- Sequence Deletion
- Sequence Homology, Nucleic Acid
- Signal Transduction
- Transcription, Genetic
- Vidarabine/analogs & derivatives
- Vidarabine/pharmacology
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Brito C, Niklitschek L, Molina LH, Molina I. Evaluation of mathematical equations to predict the theoretical yield of Chilean Gouda cheese. INT J DAIRY TECHNOL 2002. [DOI: 10.1046/j.1364-727x.2001.00035.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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46
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Brito C, Naviliat M, Tiscornia AC, Vuillier F, Gualco G, Dighiero G, Radi R, Cayota AM. Peroxynitrite inhibits T lymphocyte activation and proliferation by promoting impairment of tyrosine phosphorylation and peroxynitrite-driven apoptotic death. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1999; 162:3356-66. [PMID: 10092790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
Peroxynitrite (ONOO-) is a potent oxidizing and nitrating agent produced by the reaction of nitric oxide with superoxide. It readily nitrates phenolic compounds such as tyrosine residues in proteins, and it has been demonstrated that nitration of tyrosine residues in proteins inhibits their phosphorylation. During immune responses, tyrosine phosphorylation of key substrates by protein tyrosine kinases is the earliest of the intracellular signaling pathways following activation through the TCR complex. This work was aimed to evaluate the effects of ONOO- on lymphocyte tyrosine phosphorylation, proliferation, and survival. Additionally, we studied the generation of nitrating species in vivo and in vitro during immune activation. Our results demonstrate that ONOO-, through nitration of tyrosine residues, is able to inhibit activation-induced protein tyrosine phosphorylation in purified lymphocytes and prime them to undergo apoptotic cell death after PHA- or CD3-mediated activation but not upon phorbol ester-mediated stimulation. We also provide evidence indicating that peroxynitrite is produced during in vitro immune activation, mainly by cells of the monocyte/macrophage lineage. Furthermore, immunohistochemical studies demonstrate the in vivo generation of nitrating species in human lymph nodes undergoing mild to strong immune activation. Our results point to a physiological role for ONOO- as a down-modulator of immune responses and also as key mediator in cellular and tissue injury associated with chronic activation of the immune system.
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Wessel HF, Herrmann B, Dupret A, Moniz F, Brito C, Bergström S. Genital infections among antenatal care attendees in Cape Verde. Afr J Reprod Health 1998; 2:32-40. [PMID: 10214427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
In a cross-sectional study, 350 pregnant Capeverdian women were examined to assess the prevalence of Chlamydia trachomatis infection (CT), Neisseria gonorrhoeae infection (NG) and Bacterial vaginosis (BV). Among various analytic methods used, the polymerase chain reaction PCR (for NG, CT) yielded a higher detection rate than did direct microscopy or culture (NG), or direct immuno-fluorescence (CT). Since the PCR analytic of air-dried specimens is not hampered by harsh storage and transport conditions, it could serve to validate other detection methods where laboratory facilities are suboptimal. Among sociodemographic risk factors young age, and currently living alone, were significantly associated with infection.
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Wall M, Johnson CA, Kutzko KE, Nguyen R, Brito C, Keltner JL. Long- and short-term variability of automated perimetry results in patients with optic neuritis and healthy subjects. ARCHIVES OF OPHTHALMOLOGY (CHICAGO, ILL. : 1960) 1998; 116:53-61. [PMID: 9445208 DOI: 10.1001/archopht.116.1.53] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To measure the short- and long-term variability of automated perimetry in patients with optic neuritis and normal subjects. DESIGN Prospective case-control design of patients with recovered optic neuritis with intraday and interday repetitions to obtain robust variability measurements. Entry criteria included a corrected pattern SD that was worse than the normal 5% probability level and a mean deviation worse than -3 dB but better than -20 dB. Five Humphrey 30-2 full threshold tests were administered during a 7-hour period (1 test every 2 hours) on the same day and at the same periods on 5 separate days. SUBJECTS Seventeen patients with recovered optic neuritis and 10 healthy subjects of similar age. MAIN OUTCOME MEASURES Short-term variability and long-term variability for global visual field data. RESULTS Patients with optic neuritis demonstrated variations in visual field sensitivity that were outside the entire range of variability for normal controls. These variations occurred for multiple tests performed on the same day at specific times and for tests performed at specific times on different days. There were no consistent patterns of sensitivity changes that could be attributed to time of day. The most dramatic fluctuations occurred in a patient whose visual fields varied from normal to a hemianopic defect from one week to another and from a partial quadrant loss to a hemianopic defect at different times on the same day. Seven of the patients with optic neuritis also demonstrated intermittent vertical step defects. CONCLUSIONS Patients with resolved optic neuritis can have large variations in visual field results on different days and at different times on the same day. The variations affect both the severity and the pattern of visual field loss and do not appear to be consistent across patients. These data indicate that care must be taken when automated visual field results in patients with optic neuritis are interpreted. Distinguishing systematic changes in sensitivity from variability requires more than a comparison of the current visual field with the most recent previous visual field.
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Villuendas MC, Gorricho J, Remacha MA, Sánchez A, Brito C. [Corneal crystalline image in patient with keratoplasty]. Enferm Infecc Microbiol Clin 1996; 14:565-6. [PMID: 9035717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Figueredo-Silva J, Jungmann P, Norões J, Piessens WF, Coutinho A, Brito C, Rocha A, Dreyer G. Histological evidence for adulticidal effect of low doses of diethylcarbamazine in bancroftian filariasis. Trans R Soc Trop Med Hyg 1996; 90:192-4. [PMID: 8761588 DOI: 10.1016/s0035-9203(96)90138-8] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
The ability of diethylcarbamazine (DEC) to kill adult Wuchereria bancrofti worms was evaluated by examining lymphatic nodules formed after treatment with 4 different treatment schedules of 193 males living in the endemic area of Greater Recife, Brazil. Lymphatic nodules appeared in the spermatic cord or upper extremities in 43 of 138 microfilaraemic individuals, in 3 of 30 amicrofilaraemic patients with filarial disease manifestations, and in 1 of 25 asymptomatic amicrofilaraemic residents of the endemic area treated with DEC. Fourteen of these nodules were surgically removed 10-150 d after the start of treatment. Regardless of the DEC dosage and schedule used, all nodules contained damaged and degenerating adult worms. An exuberant granulomatous process with large numbers of eosinophils and progressive fibrosis gradually developed around the dead parasites. The mechanism(s) by which DEC killed adult W. bancrofti could not be determined.
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