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Yue R, Hui B, Chen H. EFFECT OF THE C-TERMINUS OF TSHR ON T4 AND TRAB EXPRESSION IN BALB/C MICE. Acta Endocrinol (Buchar) 2023; 19:149-154. [PMID: 37908889 PMCID: PMC10614581 DOI: 10.4183/aeb.2023.149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Context The expression of TSHR-C on the serum tetraiodothyronine (T4) and TSH receptor antibody (TRAb) levels are rarely studied. Objective The effect of TSHR-c on T4 and TRAb levels and concomitant thyroid histological changes in mice was investigated. Design Animal experimental study. Subjects and methods Female BALB/c mice at 6-8 weeks of age were immunized with the thyroid stimulating hormone receptor antigen C-terminus (TSHR-C), and randomly divided into control group (treated with the corresponding concentrations of normal saline) and four experimental subgroups: TSHR-c1 subgroup (4 µg), TSHR-c2 subgroup (6 µg), TSHR-c3 subgroup (8 µg) and TSHR-c4 subgroup (10 µg). Serum T4 and TRAb levels were determined. Results The serum T4 level decreased significantly in the experimental mice as the concentration increased. All the experimental mice were positive for serum TRAb (experimental groups: 40 positive/40, 100% vs. control group: 3 positive/10, 30%) compared to the control group (P =0.000). HE staining showed that the follicles in the control mice were composed of small to medium-sized round follicles, whereas the follicles in the experimental mice were irregularly enlarged under light microscope. Conclusions TSHR-c immunization resulted in thyroid hormone changes like those observed in hypothyroidism, probably due to the induction of TRAb generation.
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Affiliation(s)
- R.H. Yue
- Lanzhou University Second Hospital, Department of Endocrine Metabolic, Lanzhou
| | - B. Hui
- Qingdao Municipal Hospital Group East Hospital - No.1, Department of Cardiology, Qingdao, Shandong, China
| | - H. Chen
- Lanzhou University Second Hospital, Department of Endocrine Metabolic, Lanzhou
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Yeom JW, Kholinne E, Kim DM, Lee JB, Hui B, AlAhmadi BM, Shin MJ, Kim M, Park JH, Koh KH, Jeon IH. Postoperative HbA1c Level as a Predictor of Rotator Cuff Integrity After Arthroscopic Rotator Cuff Repair in Patients With Type 2 Diabetes. Orthop J Sports Med 2023; 11:23259671221145987. [PMID: 36814763 PMCID: PMC9940196 DOI: 10.1177/23259671221145987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
Background In patients with type 2 diabetes mellitus (DM), preoperative glycosylated hemoglobin (HbA1c) is associated with outcomes after arthroscopic rotator cuff repair (ARCR); however, the relationship between outcomes and postoperative serum glycosylated hemoglobin (HbA1c) after ARCR has not been investigated. Purpose To evaluate outcomes after ARCR in patients (1) with and without DM and (2) with DM according to their pre- and postoperative HbA1c levels. Study Design Cohort study; Level of evidence, 3. Method Included in this study were 148 patients without DM and 35 patients with type 2 DM who underwent ARCR between January 1, 2017, and December 31, 2019. Clinical and radiological outcomes were evaluated preoperatively and at the latest clinical follow-up. Postoperative magnetic resonance imaging was performed after 12 months. In patients with type 2 DM, HbA1c levels were evaluated preoperatively as well as 6 and 12 months postoperatively; patients with an HbA1c level of ≥7% were defined as having uncontrolled DM. Multivariate logistic regression analyses were performed to determine the factors for retears after ARCR. Results The retear rates after ARCR were 22.9% (8/35) and 16.9% (25/148) in patients with and without DM, respectively. The retear rates were significantly higher in the 6-month postoperative uncontrolled DM group than in the controlled DM and non-DM groups (50% vs 8.7% and 16.8%; P < .05). The odds ratio for retears in the postoperative uncontrolled DM group was 5.555 (P =0.01) compared with the non-DM group. Among the patients with DM, in the uncontrolled DM group, 6-month postoperative hyperglycemia was superior in accuracy, sensitivity, and specificity for predicting retears after ARCR than preoperative hyperglycemia (77.1% vs 62.9%, 75% vs 37.5%, and 77.8% vs 70.4%, respectively). Conclusion This study demonstrated the association between uncontrolled postoperative DM and an increased risk of retears compared with no DM or controlled DM. Furthermore, postoperative HbA1c values were correlated more closely with the risk of retears than preoperative HbA1c values.
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Affiliation(s)
- Ji Woong Yeom
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.,Department of Orthopaedic Surgery, Gangbook Yonsei Hospital, Seoul, Republic of Korea
| | - Erica Kholinne
- Department of Orthopaedic Surgery, St Carolus Hospital, Jakarta, Indonesia
| | - Dong Min Kim
- Department of Orthopaedic Surgery, Sarang Plus Hospital, Seoul, Republic of Korea
| | - Jun-Bum Lee
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Ben Hui
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Basim Masoud AlAhmadi
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Myung Jin Shin
- Department of Orthopaedic Surgery, Himchan Hospital Bupyeong, Incheon, Republic of Korea
| | - Minsoo Kim
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Jeong Hee Park
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - Kyoung-Hwan Koh
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
| | - In-Ho Jeon
- Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.,In-Ho Jeon, MD, PhD, Department of Orthopaedic Surgery, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 05535, Republic of Korea ()
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Keefe SH, Keefe MG, Hui B, Pogrel MA. Patient motivation and satisfaction from orthognathic surgery-a case series. Oral Surg Oral Med Oral Pathol Oral Radiol 2023; 135:e15-e24. [PMID: 36058835 DOI: 10.1016/j.oooo.2022.06.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Revised: 06/13/2022] [Accepted: 06/30/2022] [Indexed: 11/18/2022]
Abstract
OBJECTIVE This study attempted to understand the specific motivations of patients who undergo orthognathic surgery and determine their satisfaction with the surgery. The study also assessed the prevalence of complications and how they may impact patient satisfaction. STUDY DESIGN Patients who underwent orthognathic surgery at the University of California between 2016 and 2019 and had completed postoperative orthodontic treatment for ≥9 months were interviewed. They responded to an open-ended telephone interview regarding their motivations, satisfaction, and complications. RESULTS The patients showed a high level of satisfaction with the surgery, but there were persistent complications that affected satisfaction. The predominant complication was paresthesia over the distribution of the inferior alveolar nerve. The majority of patients who reported prior headaches and temporomandibular joint problems described improvement in those areas. Comparing the patients' motivations before and after surgery showed that before surgery, patients reported functional concerns, whereas postoperatively they were much more likely to recall aesthetic reasons for the surgery. CONCLUSION This study showed that although patients are generally satisfied after orthognathic surgery, patients need to be realistically informed of their expectations and adequately informed of possible complications.
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Affiliation(s)
- S H Keefe
- University of North Carolina, Chapel Hill, NC, USA
| | - M G Keefe
- University of California, San Francisco, CA, USA
| | - B Hui
- University of California, San Francisco, CA, USA
| | - M A Pogrel
- Department of Oral and Maxillofacial Surgery, University of California, San Francisco, CA, USA.
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Kawi NH, Sihotang EP, Nisa T, Hui B, Causer LM, Januraga PP, Ronoatmodjo S. Incidence and risk factors for syphilis infection among men who have sex with men: A cohort study from an urban sexual health clinic in Jakarta, Indonesia. Int J STD AIDS 2022; 33:1065-1072. [PMID: 36067281 DOI: 10.1177/09564624221125079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective: Syphilis infection remains a significant health issue among marginalised populations in Indonesia, in particular among men who have sex with men (MSM), in whom there are limited studies from Indonesia exploring risk factors associated with STI acquisition.Our study aimed to identify risk factors of syphilis infection among MSM attending large sexual health clinic in Jakarta. Methods: We conducted a retrospective cohort analysis using patient records (MSM aged 18 years or older) period Jan 2018-Dec 2019. We used Cox regression to identify risk factors associated with syphilis incidence. Results: Study population were 2912 MSM tested for syphilis, 473 (16.2%) were diagnosed with syphilis on their first visit; early syphilis (415; 14%) and latent syphilis (58, 2%). Among the cohort of 2439 MSM who tested negative at baseline, 40 MSM were identified with a new positive syphilis result during 2 years follow up. Risk factors remaining significantly associated with syphilis incidence included having STI symptom at 1st visit (aHR, 2.8; 95% CI, 1.38-5.65), and HIV-infection (aHR 4.53; 95% CI 2.24 - 9.17).Syphilis incidence rate was 8.19 (95% CI 6.01-11.16) per 100 PYFU. Conclusions: Syphilis infection at baseline and incidence was high among MSM attending this large clinic in Jakarta. Integrated and accessible syphilis prevention and detection coupled with HIV services are needed, with a special focus on high-risk individuals.
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Affiliation(s)
- Nurhayati H Kawi
- Public Health, 206718University of Indonesia, Depok (Kota), Indonesia.,Globalindo Clinic, Jakarta Selatan, Indonesia
| | | | - Tiara Nisa
- Globalindo Clinic, Jakarta Selatan, Indonesia
| | - Ben Hui
- UNSW Sydney, 2786Kirby Institute, Sydney, Australia
| | | | - Pande Putu Januraga
- Center for Public Health Innovation, Faculty of Medicine, 95340Udayana University, Denpasar, Indonesia
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Che S, Xi R, Pan S, Chen X, Hui B, Fu S, Guo J, Zhang X. HPV16 E6-E7 Induces Cancer Stem-like Cell Phenotypes and Chemoradioresistance in Esophageal Squamous Cell Carcinoma Through Activation of PI3K/Akt Signaling Pathway. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.2027] [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: 10/20/2022]
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Hui B, Hocking J, Low N, Regan D. S09.3 The impact of screening on chlamydia transmission in australia -– a mathematical modelling study. Br J Vener Dis 2015. [DOI: 10.1136/sextrans-2015-052270.54] [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: 11/03/2022]
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7
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Hui B, Ryder N, Su JY, Ward J, Chen M, Donovan B, Fairley C, Guy R, Lahra M, Law M, Whiley D, Regan D. 001.6 Exploring the benefits of molecular testing for gonorrhoea antibiotic resistance surveillance in remote settings. Br J Vener Dis 2015. [DOI: 10.1136/sextrans-2015-052270.84] [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: 11/03/2022]
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Hui B, Whiley D, Donovan B, Regan D. P09.09 Exploring the relationship between importation frequency and the persistence of gonorrhoea strains in an msm population: a modelling study. Br J Vener Dis 2015. [DOI: 10.1136/sextrans-2015-052270.393] [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: 11/03/2022]
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Yuxue Z, Changxiang C, Qingguang Q, Hui B, Junhong G, Xiaochun Y, Bing Z. Effect of manual acupuncture on bowel motility in normal kunming mouse. J TRADIT CHIN MED 2015; 35:227-33. [PMID: 25975058 DOI: 10.1016/s0254-6272(15)30033-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE To observe the effects of acupuncture on motility of jejunum and distal colon at different acupoints on normal Kunming mice. METHODS The jejunal and colorectal motor activity of forty Kunming mice were recorded by the intra-intestinal capsule. The capsules contained with distilled water were placed into the cavities of jejunum and distal colon. The changes of bowel were compared with the background activity recorded before any stimulation. The chosen acupoints were as follows: Zusanli (ST 36) on the lower legs, Tianshu (ST 25) on the mid-lower abdomen. RESULTS Manual acupuncture (MA) at Zusanli (ST 36) significantly promoted the motility of jejunum and distal colon (manifested as increased change rate of average amplitude and increased change rate of mean area under the contractile curve) of normal Kunming mice (P < 0.01). MA at Tianshu (ST 25) significantly inhibited the motility of jejunum (manifested as decreased change rate of average amplitude, decreased change rate of mean area under the contractile curve, and the reduced frequency) of normal Kunming mice (P < 0.01), while significantly increased the distal colonic motility (manifested as increased amplitude and increased mean area under the contractile curve) of normal Kunming mice (P < 0.01). CONCLUSION MA at specific acupoints [Zusanli (ST 36), Tianshu (ST 25)] has different effects on the motility of jejunum and distal colon, which might involve the segmental innervations of the related nerve.
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Hui B, Fairley CK, Chen M, Grulich A, Hocking J, Prestage G, Walker S, Law M, Regan D. Oral and anal sex are key to sustaining gonorrhoea at endemic levels in MSM populations: a mathematical model. Sex Transm Infect 2015; 91:365-9. [PMID: 25596192 DOI: 10.1136/sextrans-2014-051760] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Accepted: 12/14/2014] [Indexed: 11/04/2022] Open
Abstract
OBJECTIVES Despite early treatment of urethral infection, gonorrhoea is endemic in urban populations of men who have sex with men (MSM) in Australia. By contrast, gonorrhoea is not common in urban heterosexual populations. Sexual activities among MSM usually involve anal or oral sex, and as these behaviours are becoming increasingly common among heterosexuals, there is a need to investigate their roles in transmission of gonorrhoea. METHODS We developed individual-based models of transmission of gonorrhoea in MSM and heterosexuals that incorporate anatomical site-specific transmission of gonorrhoea. We estimated the probabilities of transmission for anal sex and oral sex by calibrating an MSM model against prevalence of gonorrhoea and sexual activity data. These probabilities were then applied to a heterosexual model in order to examine whether gonorrhoea can persist in a heterosexual population through the addition of anal sex and oral sex. RESULTS In the MSM model, gonorrhoea can persist despite prompt treatment of urethral infections. The probability of gonorrhoea persisting is reduced if use of condom for oral sex is increased to more than 15% of acts. Assuming that treatment of symptomatic infections is prompt, gonorrhoea is unlikely to persist in a heterosexual population even with the addition of anal and oral sex. CONCLUSIONS Our models suggest that oral sex has an important role in sustaining gonorrhoea in a population of MSM by providing a pool of untreated asymptomatic infection. The importance of anal sex or oral sex in sustaining gonorrhoea in a heterosexual population remains uncertain due to the lack of information linking different types of sex acts and transmissibility.
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Affiliation(s)
- B Hui
- The Kirby Institute, UNSW Australia, Sydney, Australia
| | - C K Fairley
- School of Population and Global Health, University of Melbourne, Melbourne, Australia Melbourne Sexual Health Centre, Alfred Health, Melbourne, Australia Australian Research Centre in Sex, Health and Society, La Trobe University, Melbourne, Australia
| | - M Chen
- School of Population and Global Health, University of Melbourne, Melbourne, Australia Melbourne Sexual Health Centre, Alfred Health, Melbourne, Australia Australian Research Centre in Sex, Health and Society, La Trobe University, Melbourne, Australia
| | - A Grulich
- The Kirby Institute, UNSW Australia, Sydney, Australia
| | - J Hocking
- Centre for Women's Health, Gender and Society, University of Melbourne, Melbourne, Australia
| | - G Prestage
- The Kirby Institute, UNSW Australia, Sydney, Australia Australian Research Centre in Sex, Health and Society, La Trobe University, Melbourne, Australia
| | - S Walker
- Melbourne Sexual Health Centre, Alfred Health, Melbourne, Australia
| | - M Law
- The Kirby Institute, UNSW Australia, Sydney, Australia
| | - D Regan
- The Kirby Institute, UNSW Australia, Sydney, Australia
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Peters R, Beck L, Fifita L, Hui B, Tui`one V, Page C, Sur R, Tanjasiri S. P04.79. Navigating breast and cervical cancer screening services for Tongan women in Southern California. Altern Ther Health Med 2012. [PMCID: PMC3373854 DOI: 10.1186/1472-6882-12-s1-p349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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Hui B, Sharpe J, Poublanc J, Chmielewski A, Fierstra J, Mandell D, Mikulis D. Cerebrovascular Reactivity in Idiopathic Intracranial Hypertension Measured by Blood Oxygen Level-Dependent MRI (P04.248). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p04.248] [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: 11/15/2022] Open
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Sudharshan N, Hanstock C, Hui B, Pyra T, Johnston W, Kalra S. Degeneration of the mid-cingulate cortex in amyotrophic lateral sclerosis detected in vivo with MR spectroscopy. AJNR Am J Neuroradiol 2010; 32:403-7. [PMID: 21087934 DOI: 10.3174/ajnr.a2289] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Various lines of evidence implicate cerebral involvement beyond the motor cortex in ALS, including the cingulate gyrus and the thalamus. The purpose of this study was to assess neurodegeneration in these regions in vivo by using MRSI. MATERIALS AND METHODS Fourteen patients with ALS and 14 healthy controls underwent MRSI by using a coronal acquisition scheme. The NAA/Cho ratio was quantified in the MCC, thalamus, and motor cortex (PCG). RESULTS NAA/Cho was reduced in the MCC in patients with ALS compared with the controls (P = .0004). There was no difference in NAA/Cho in the thalamus (P = .59). We also found a strong correlation of NAA/Cho among the PCG, MCC, and the thalamus in controls, which was absent in patients with ALS. CONCLUSIONS Neurodegeneration beyond the motor cortex is present in the MCC in ALS. The significant correlation of NAA/Cho among the PCG, MCC, and the thalamus in healthy subjects likely reflects the neuronal connectivity among these regions. The loss of these relationships in patients with ALS suggests that such connectivity is not responsible for the pattern of degeneration in these regions.
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Affiliation(s)
- N Sudharshan
- Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
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Haitao G, Ronghuai Z, Yuemin W, Hui B, Juan L, Jianming P. e0152 Endogenous opioid peptide mediates the cardioprotection induced by ischaemic postconditioning. Heart 2010. [DOI: 10.1136/hrt.2010.208967.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Lee MS, Green R, Marsillac SM, Coquelle N, Williams RS, Yeung T, Foo D, Hau DD, Hui B, Monteiro ANA, Glover JNM. Comprehensive analysis of missense variations in the BRCT domain of BRCA1 by structural and functional assays. Cancer Res 2010; 70:4880-90. [PMID: 20516115 DOI: 10.1158/0008-5472.can-09-4563] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Genetic screening of the breast and ovarian cancer susceptibility gene BRCA1 has uncovered a large number of variants of uncertain clinical significance. Here, we use biochemical and cell-based transcriptional assays to assess the structural and functional defects associated with a large set of 117 distinct BRCA1 missense variants within the essential BRCT domain of the BRCA1 protein that have been documented in individuals with a family history of breast or ovarian cancer. In the first method, we used limited proteolysis to assess the protein folding stability of each of the mutants compared with the wild-type. In the second method, we used a phosphopeptide pull-down assay to assess the ability of each of the variants to specifically interact with a peptide containing a pSer-X-X-Phe motif, a known functional target of the BRCA1 BRCT domain. Finally, we used transcriptional assays to assess the ability of each BRCT variant to act as a transcriptional activation domain in human cells. Through a correlation of the assay results with available family history and clinical data, we define limits to predict the disease risk associated with each variant. Forty-two of the variants show little effect on function and are likely to represent variants with little or no clinical significance; 50 display a clear functional effect and are likely to represent pathogenic variants; and the remaining 25 variants display intermediate activities. The excellent agreement between the structure/function effects of these mutations and available clinical data supports the notion that functional and structure information can be useful in the development of models to assess cancer risk.
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Affiliation(s)
- Megan S Lee
- Department of Biochemistry, School of Systems Molecular Medicine, University of Alberta, Edmonton, Alberta, Canada
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Abstract
Several lines of evidence suggest the non-cholinergic functions of acetylcholinesterase (AChE) in promoting neurite outgrowth of cultured neurons and in inducing the postsynaptic specializations of developing neuromuscular junctions. In order to support the hypothesis, a cholinergic synapse-forming cell line NG108-15 was over-expressed with chick AChE by cDNA transfection. The transfected NG108-15 cells secreted a approximately 105-kDa protein, recognized by anti-AChE antibody in Western blot analysis, corresponding to the chick AChE catalytic subunit. Over 80% of the recombinant enzyme were secreted into the conditioned medium and they were enzymatically active. In the NG108-15 cell-muscle co-cultures, the AChR-aggregating activity of NG108-15 cells was increased by the over-expression of AChE. The increase in AChR-aggregating activity of the transfected NG108-15 cells paralleled with the increase in agrin and neurofilament expression of the transfected cells as determined by their corresponding antibodies. However, the intracellular cAMP level remained unchanged in the AChE over-expressed NG108-15 cells. These results support the hypothesis that AChE could play a role in promoting neuron differentiation.
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Affiliation(s)
- R C Choi
- Department of Biology and Biotechnology Research Institute, The Hong Kong University of Science and Technology, Kowloon, China
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Abstract
The reduction rates of five-membered pyrrolidine and pyrroline, and six-membered piperidine nitroxides (alternatively termed nitroxyls) containing various substituents were determined under homogeneous conditions using ascorbate, and electrochemically under heterogeneous conditions. The results were compared with data from the literature. It was shown that the increased rates of reduction of six-membered nitroxides, compared with those of the five-membered nitroxides, cannot be explained on the basis of differences in electrochemical potentials but, rather, can be ascribed to differences in the accessibility of the nitroxide group. A double bond in the five-membered nitroxyls increases the reduction rate. Within any ring system, the reduction rates of nitroxides using ascorbate can be correlated with the inductive substituent constants. The half-way potentials for electrochemical reduction within a series of nitroxides based on the same ring correlate with logarithms of the rates using ascorbate and with the inductive constants. The potentials for one-electron oxidation of the nitroxides were related to the inductive constants.
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Affiliation(s)
- S Morris
- College of Medicine, University of Illinois at Urbana-Champaign 61801
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Hui B, Hubbard RF, Lampe M, Lau YY, Fernsler RR, Joyce G. Hose-induced current enhancement associated with beam propagation. Phys Rev Lett 1985; 55:87-90. [PMID: 10031687 DOI: 10.1103/physrevlett.55.87] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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