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Zhang H, Haun RS, Collin F, Cassol C, Napier JOH, Wilson J, Hassen S, Ararat K, Boils C, Messias N, Caza TN, Cossey LN, Sharma S, Ambruzs JM, Agrawal N, Shekhtman G, Tian W, Srinivas T, Qu K, Woodward RN, Larsen CP, Stone S, Coley SM. Development and Validation of a Multiclass Model Defining Molecular Archetypes of Kidney Transplant Rejection: A Large Cohort Study of the Banff Human Organ Transplant Gene Expression Panel. J Transl Med 2024; 104:100304. [PMID: 38092179 DOI: 10.1016/j.labinv.2023.100304] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 11/19/2023] [Accepted: 12/06/2023] [Indexed: 01/15/2024] Open
Abstract
Gene expression profiling from formalin-fixed paraffin-embedded (FFPE) renal allograft biopsies is a promising approach for feasibly providing a molecular diagnosis of rejection. However, large-scale studies evaluating the performance of models using NanoString platform data to define molecular archetypes of rejection are lacking. We tested a diverse retrospective cohort of over 1400 FFPE biopsy specimens, rescored according to Banff 2019 criteria and representing 10 of 11 United Network of Organ Sharing regions, using the Banff Human Organ Transplant panel from NanoString and developed a multiclass model from the gene expression data to assign relative probabilities of 4 molecular archetypes: No Rejection, Antibody-Mediated Rejection, T Cell-Mediated Rejection, and Mixed Rejection. Using Least Absolute Shrinkage and Selection Operator regularized regression with 10-fold cross-validation fitted to 1050 biopsies in the discovery cohort and technically validated on an additional 345 biopsies, our model achieved overall accuracy of 85% in the discovery cohort and 80% in the validation cohort, with ≥75% positive predictive value for each class, except for the Mixed Rejection class in the validation cohort (positive predictive value, 53%). This study represents the technical validation of the first model built from a large and diverse sample of diagnostic FFPE biopsy specimens to define and classify molecular archetypes of histologically defined diagnoses as derived from Banff Human Organ Transplant panel gene expression profiling data.
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Affiliation(s)
| | | | | | | | | | - Jon Wilson
- Arkana Laboratories, Little Rock, Arkansas
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Hassen S, Chebbi H, Arfaoui Y, Robeyns K, Steenhaut T, Hermans S, Filinchuk Y. Spectroscopic and structural studies, thermal characterization, optical proprieties and theoretical investigation of 2-aminobenzimidazolium tetrachlorocobaltate(II). Spectrochim Acta A Mol Biomol Spectrosc 2020; 240:118612. [PMID: 32604047 DOI: 10.1016/j.saa.2020.118612] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 05/24/2020] [Accepted: 06/10/2020] [Indexed: 06/11/2023]
Abstract
In this study we present the crystal structure, spectroscopic and thermal behavior, Hirshfeld surface analysis, and DFT calculations of a new organic-inorganic hybrid compound (C7H8N3)2[CoCl4]. This compound crystallizes in the centrosymmetric space group P1¯. Single-crystal X-ray diffraction analysis indicates that structure consists of a succession of mixed layers formed by organic cations and inorganic anions parallel to the (001) plane and propagate according to the c-axis. Layers further are assembled into a 3D supramolecular architecture through N-H…Cl hydrogen bonds and π…π interactions. The peak positions of the experimental PXRD pattern are in agreement with the simulated ones from the crystal structure, indicating phase purity of the title compound. The presence of the different functional groups and the nature of their vibrations were identified by ATR-FTIR and FT-Raman spectroscopies. The tetrahedral environment of Co2+ was confirmed by UV-visible spectroscopy, where the spectrum shows three weak absorption bands in the visible range due to d-d electronic transitions 4A2(F) → 4T2(F), 4A2(F) → 4T1(F) and 4A2(F) → 4T1(P) typical of Co(II) coordination compounds. The direct and indirect optical band gap values were determined by Tauc method. The optimized structure and calculated vibrational frequencies were obtained by density functional theory (DFT) using B3LYP functional. TGA and DSC coupled to mass spectrometry (MS) experiments under argon atmosphere in the temperature range (25-950 °C) were carried out in order to determine the thermal stability of the title compound.
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Affiliation(s)
- S Hassen
- University of Tunis El Manar, Faculty of Sciences of Tunis, Laboratory of Characterizations, Applications and Modeling of Materials, 2092 El Manar II, Tunis, Tunisia
| | - H Chebbi
- University of Tunis, Preparatory Institute for Engineering Studies of Tunis, Street Jawaher Lel Nehru, 1089 Montfleury, Tunis, Tunisia; University of Tunis El Manar, Faculty of Sciences of Tunis, Laboratory of Materials, Crystal Chemistry and Applied Thermodynamics, 2092 El Manar II, Tunis, Tunisia.
| | - Y Arfaoui
- University of Tunis El Manar, Faculty of Sciences of Tunis, Laboratory of Characterizations, Applications and Modeling of Materials, 2092 El Manar II, Tunis, Tunisia
| | - K Robeyns
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - T Steenhaut
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - S Hermans
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - Y Filinchuk
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
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Hassen S, Chebbi H, Zid M, Arfaoui Y. Crystal structure, spectroscopic study, photoluminescent properties and DFT calculations of the 2-guanidinobenzimidazolium dichloride and dibromide monohydrate salts. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.04.073] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hassen S, Ali AA, Kilaparty SP, Al-Anbaky QA, Majeed W, Boman BM, Fields JZ, Ali N. Interdependence of DNA mismatch repair proteins MLH1 and MSH2 in apoptosis in human colorectal carcinoma cell lines. Mol Cell Biochem 2016; 412:297-305. [PMID: 26728996 DOI: 10.1007/s11010-015-2636-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 06/26/2015] [Accepted: 12/23/2015] [Indexed: 01/06/2023]
Abstract
The mammalian DNA mismatch repair (MMR) system consists of a number of proteins that play important roles in repair of base pair mismatch mutations and in maintenance of genomic integrity. A defect in this system can cause genetic instability, which can lead to carcinogenesis. For instance, a germline mutation in one of the mismatch repair proteins, especially MLH1 or MSH2, is responsible for hereditary non-polyposis colorectal cancer. These MMR proteins also play an important role in the induction of apoptosis. Accordingly, altered expression of or a defect in MLH1 or MSH2 may confer resistance to anti-cancer drugs used in chemotherapy. We hypothesized that the ability of these two MMR proteins to regulate apoptosis are interdependent. Moreover, a defect in either one may confer resistance to chemotherapy by an inability to trigger apoptosis. To this end, we studied three cell lines-SW480, LoVo, and HTC116. These cell lines were selected based on their differential expression of MLH1 and MSH2 proteins. SW480 expresses both MLH1 and MSH2; LoVo expresses only MLH1 but not MSH2; HCT116 expresses only MSH2 but not MLH1 protein. MTT assays, a measure of cytotoxicity, showed that there were different cytotoxic effects of an anti-cancer drug, etoposide, on these cell lines, effects that were correlated with the MMR status of the cells. Cells that are deficient in MLH1 protein (HCT116 cells) were resistant to the drug. Cells that express both MLH1 and MSH2 proteins (SW480 cells) showed caspase-3 cleavage, an indicator of apoptosis. Cells that lack MLH1 (HCT116 cells) did not show any caspase-3 cleavage. Expression of full-length MLH1 protein was decreased in MMR proficient (SW480) cells during apoptosis; it remained unchanged in cells that lack MSH2 (LoVo cells). The expression of MSH2 protein remained unchanged during apoptosis both in MMR proficient (SW480) and deficient (HCT116) cells. Studies on translocation of MLH1 protein from nucleus to cytosolic fraction, an indicator of apoptosis, showed that MLH1 translocation only occurred in MMR proficient (SW480) cells upon induction of apoptosis further suggested a MSH2 dependent role of MLH1 in apoptosis. These data suggest a role of MLH1 in mediation of apoptosis in a MSH2-dependent manner. Taken together, our data supported an interdependence of mismatch repair proteins, particularly MLH1 and MSH2, in the mediation of apoptosis in human colorectal carcinoma cell lines.
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Affiliation(s)
- Samar Hassen
- Department of Biology, College of Arts, Letters and Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR, 72204, USA
| | - Akhtar A Ali
- Department of Biology, College of Arts, Letters and Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR, 72204, USA.,CATX Inc., Gladwyne, PA, 19035, USA
| | - Surya P Kilaparty
- Department of Biology, College of Arts, Letters and Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR, 72204, USA
| | - Qudes A Al-Anbaky
- Department of Biology, College of Arts, Letters and Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR, 72204, USA
| | - Waqar Majeed
- Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, Little Rock, AR, 72204, USA
| | - Bruce M Boman
- Department of Pharmacology and Experimental Therapeutics, Thomas Jefferson University, Kimmel Cancer Center, Philadelphia, PA, 19107, USA.,Center for Translational Cancer Research, University of Delaware, Helen F Graham Cancer Center, Newark, DE, 19713, USA.,CATX Inc., Gladwyne, PA, 19035, USA
| | | | - Nawab Ali
- Department of Biology, College of Arts, Letters and Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR, 72204, USA.
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Hassen S, Ali N, Chowdhury P. Molecular signaling mechanisms of apoptosis in hereditary non-polyposis colorectal cancer. World J Gastrointest Pathophysiol 2012; 3:71-9. [PMID: 22737591 PMCID: PMC3382705 DOI: 10.4291/wjgp.v3.i3.71] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Revised: 05/31/2012] [Accepted: 06/12/2012] [Indexed: 02/06/2023] Open
Abstract
Colorectal cancer is the second most leading cause of cancer related deaths in the western countries. One of the forms of colorectal cancer is hereditary non-polyposis colorectal cancer (HNPCC), also known as “Lynch syndrome”. It is the most common hereditary form of cancer accounting for 5%-10% of all colon cancers. HNPCC is a dominant autosomal genetic disorder caused by germ line mutations in mismatch repair genes. Human mismatch repair genes play a crucial role in genetic stability of DNA, the inactivation of which results in an increased rate of mutation and often a loss of mismatch repair function. Recent studies have shown that certain mismatch repair genes are involved in the regulation of key cellular processes including apoptosis. Thus, differential expression of mismatch repair genes particularly the contributions of MLH1 and MSH2 play important roles in therapeutic resistance to certain cytotoxic drugs such as cisplatin that is used normally as chemoprevention. An understanding of the role of mismatch repair genes in molecular signaling mechanism of apoptosis and its involvement in HNPCC needs attention for further work into this important area of cancer research, and this review article is intended to accomplish that goal of linkage of apoptosis with HNPCC. The current review was not intended to provide a comprehensive enumeration of the entire body of literature in the area of HNPCC or mismatch repair system or apoptosis; it is rather intended to focus primarily on the current state of knowledge of the role of mismatch repair proteins in molecular signaling mechanism of apoptosis as it relates to understanding of HNPCC.
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Karmakar A, Iancu C, Bartos DM, Mahmood MW, Ghosh A, Xu Y, Dervishi E, Collom SL, Khodakovskaya M, Mustafa T, Watanabe F, Biris AR, Zhang Y, Ali SF, Casciano D, Hassen S, Nima Z, Biris AS. Raman spectroscopy as a detection and analysis tool for in vitro specific targeting of pancreatic cancer cells by EGF-conjugated, single-walled carbon nanotubes. J Appl Toxicol 2011; 32:365-75. [DOI: 10.1002/jat.1742] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 08/10/2011] [Accepted: 08/23/2011] [Indexed: 11/11/2022]
Affiliation(s)
- Alokita Karmakar
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Cornel Iancu
- University of Medicine and Pharmacy ‘Iuliu Hatieganu’; Surgery Clinic III; Cluj-Napoca; 3400; Romania
| | - Dana Monica Bartos
- University of Medicine and Pharmacy ‘Iuliu Hatieganu’; Surgery Clinic III; Cluj-Napoca; 3400; Romania
| | - Meena W. Mahmood
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Anindya Ghosh
- University of Arkansas at Little Rock; Chemistry Department; Little Rock; AR; 72204; USA
| | - Yang Xu
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Enkeleda Dervishi
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Samuel L. Collom
- University of Arkansas at Little Rock; Chemistry Department; Little Rock; AR; 72204; USA
| | - Mariya Khodakovskaya
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Thikra Mustafa
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Fumiya Watanabe
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Alexandru R. Biris
- National Institute for Research and Development of Isotopic and Molecular Technologies; PO Box 700; R-400293; Cluj-Napoca; Romania
| | - Yongbin Zhang
- National Center for Toxicological Research; Food and Drug Administration; 3900 NCTR Road; Jefferson; AR; 72079; USA
| | - Syed F. Ali
- National Center for Toxicological Research; Food and Drug Administration; 3900 NCTR Road; Jefferson; AR; 72079; USA
| | - Dan Casciano
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Samar Hassen
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Zeid Nima
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
| | - Alexandru S. Biris
- University of Arkansas at Little Rock; Applied Science Department, Nanotechnology Center; Little Rock; AR; 72204; USA
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Hassen S, Boman BM, Ali N, Parker M, Somerman C, Ali-Khan Catts ZJ, Ali AA, Fields JZ. Detection of DNA mismatch repair proteins in fresh human blood lymphocytes--towards a novel method for hereditary non-polyposis colorectal cancer (Lynch syndrome) screening. J Exp Clin Cancer Res 2011; 30:100. [PMID: 22017758 PMCID: PMC3216249 DOI: 10.1186/1756-9966-30-100] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Accepted: 10/21/2011] [Indexed: 12/22/2022]
Abstract
BACKGROUND A broad population-based assay to detect individuals with Lynch Syndrome (LS) before they develop cancer would save lives and healthcare dollars via cancer prevention. LS is caused by a germline mutation in a DNA mismatch repair (MMR) gene, especially protein truncation-causing mutations involving MSH2 or MLH1. We showed that immortalized lymphocytes from LS patients have reduced levels of full-length MLH1 or MSH2 proteins. Thus, it may be feasible to identify LS patients in a broad population-based assay by detecting reduced levels of MMR proteins in lymphocytes. METHODS Accordingly, we determined whether MSH2 and MLH1 proteins can also be detected in fresh lymphocytes. A quantitative western blot assay was developed using two commercially available monoclonal antibodies that we showed are specific for detecting full-length MLH1 or MSH2. To directly determine the ratio of the levels of these MMR proteins, we used both antibodies in a multiplex-type western blot. RESULTS MLH1 and MSH2 levels were often not detectable in fresh lymphocytes, but were readily detectable if fresh lymphocytes were first stimulated with PHA. In fresh lymphocytes from normal controls, the MMR ratio was ~1.0. In fresh lymphocytes from patients (N > 50) at elevated risk for LS, there was a bimodal distribution of MMR ratios (range: 0.3-1.0). CONCLUSIONS Finding that MMR protein levels can be measured in fresh lymphocytes, and given that cells with heterozygote MMR mutations have reduced levels of full-length MMR proteins, suggests that our immunoassay could be advanced to a quantitative test for screening populations at high risk for LS.
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Hassen S, Barrellier MT, Seinturier C, Bosson JL, Genty C, Long A, Pernod G. High percentage of non-diagnostic compression ultrasonography results and the diagnosis of ipsilateral recurrent proximal deep vein thrombosis: a rebuttal. J Thromb Haemost 2011; 9:414-6; author reply 417-8. [PMID: 21070594 DOI: 10.1111/j.1538-7836.2010.04137.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Gastroesophageal reflux disease (GERD) in lung transplant recipients has gained increasing attention as a factor in allograft failure. There are few data on the impact of fundoplication on survival or lung function, and less on its effect on symptoms or quality of life. Patients undergoing fundoplication following lung transplantation from 1999 to 2005 were included in the study. Patient satisfaction, changes in GERD symptoms, and the presence of known side effects were assessed. The effect on lung function, body mass index, and rate of progression to the bronchiolitis obliterans syndrome (BOS) were recorded. Twenty-one patients (13 males), in whom reflux was confirmed on objective criteria, were included, with a mean age of 43 years (range 20-68). Time between transplantation and fundoplication was 768 days (range 145-1524). The indication for fundoplication was suspected microaspiration in 13 and symptoms of GERD in 8. There was one perioperative death, at day 17. There were three other late deaths. Fundoplication did not appear to affect progression to BOS stage 1, although it may have slowed progression to stage 2 and 3. Forced expiratory volume-1% predicted was 72.9 (20.9), 6 months prior to fundoplication and 70.4 (26.8), six months post-fundoplication, P= 0.33. Body mass index decreased significantly in the 6 months following fundoplication (23 kg/m(2) vs. 21 kg/m(2), P= 0.05). Patients were satisfied with the outcome of the fundoplication (mean satisfaction score 8.8 out of 10). Prevalence of GERD symptoms decreased significantly following surgery (11 of 14 vs. 4 of 17, P= 0.002). Fundoplication does not reverse any decline in lung function when performed at a late stage post-lung transplantation in patients with objectively confirmed GERD. It may, however, slow progression to the more advanced stages of BOS. Reflux symptoms are well controlled and patients are highly satisfied. Whether performing fundoplication early post-lung transplant in selected patients can prevent BOS and improve long-term outcomes requires formal evaluation.
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Affiliation(s)
- P R Burton
- Department of Surgery, The Alfred Hospital, Melbourne, Victoria, Australia.
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