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Journal of Clinical Investigation

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https://www.readbyqxmd.com/read/30418175/insulin-receptor-signaling-regulates-renal-collecting-duct-and-intercalated-cell-antibacterial-defenses
#1
Matthew J Murtha, Tad Eichler, Kristin Bender, Jackie Metheny, Birong Li, Andrew L Schwaderer, Claudia Mosquera, Cindy James, Laura Schwartz, Brian Becknell, John David Spencer
People with diabetes mellitus have increased infection risk. With diabetes, urinary tract infection (UTI) is more common and has worse outcomes. Here, we investigate how diabetes and insulin resistance impact the kidney's innate defenses and urine sterility. We report that type 2 diabetic mice have increased UTI risk. Moreover, insulin-resistant prediabetic mice have increased UTI susceptibility, independent of hyperglycemia or glucosuria. To identify how insulin resistance affects renal antimicrobial defenses, we genetically deleted the insulin receptor in the kidney's collecting tubules and intercalated cells...
November 12, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30418174/fbxo22-mediated-kdm4b-degradation-determines-selective-estrogen-receptor-modulator-activity-in-breast-cancer
#2
Yoshikazu Johmura, Ichiro Maeda, Narumi Suzuki, Wenwen Wu, Atsushi Goda, Mariko Morita, Kiyoshi Yamaguchi, Mizuki Yamamoto, Satoi Nagasawa, Yasuyuki Kojima, Koichiro Tsugawa, Natsuko Inoue, Yasuo Miyoshi, Tomo Osako, Futoshi Akiyama, Reo Maruyama, Jun-Ichiro Inoue, Yoichi Furukawa, Tomohiko Ohta, Makoto Nakanishi
The agonistic/antagonistic biocharacter of selective estrogen receptor modulators (SERMs) can have therapeutic advantages, particularly in the case of premenopausal breast cancers. Although the contradictory effects of these modulators have been studied in terms of crosstalk between the estrogen receptor α (ER) and coactivator dynamics and growth factor signaling, the molecular basis of these mechanisms is still obscure. We identify a series of regulatory mechanisms controlling cofactor dynamics on ER and SERM function, whose activities require F-box protein 22 (Fbxo22)...
November 12, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30418173/why-are-diabetics-prone-to-kidney-infections
#3
Michael Zasloff
People with diabetes mellitus are at higher risk of developing serious ascending infections of the urinary tract. The traditional explanation has focused on the role of glycosuria in promoting bacterial growth. Using mouse models, Murtha et al. demonstrate that when the intracellular insulin signaling pathway is compromised, antimicrobial defenses are compromised too, and the mice are unable to effectively handle uropathogenic E. coli introduced experimentally into the urinary tract. These observations strongly support the hypothesis that the antimicrobial defenses of the kidney are dependent on insulin, and the urinary tract infections associated with diabetes occur due to reduced expression of these key effectors of innate immunity...
November 12, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30418172/a-protective-role-for-microrna-688-in-acute-kidney-injury
#4
Nicholas Chun, Steven G Coca, John Cijiang He
Ischemia-reperfusion (I/R) sets off a devastating cascade of events, leading to cell death and possible organ failure. Treatments to limit I/R-associated damage are lacking, and the pathways that drive injury are poorly understood. In this issue of the JCI, Wei and colleagues identify microRNA-668 (miR-668) as a protective factor in acute kidney injury (AKI). miR-668 was shown to repress mitochondrial fission-associated protein MTP18, thereby inhibiting pathogenic mitochondrial fragmentation. In murine models of I/R-induced AKI, treatment with a miR-668 mimetic reduced mitochondrial fragmentation and improved renal function...
November 12, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30418171/accessory-heterozygous-mutations-in-cone-photoreceptor-cnga3-exacerbate-cng-channel-associated-retinopathy
#5
Markus Burkard, Susanne Kohl, Timm Krätzig, Naoyuki Tanimoto, Christina Brennenstuhl, Anne E Bausch, Katrin Junger, Peggy Reuter, Vithiyanjali Sothilingam, Susanne C Beck, Gesine Huber, Xi-Qin Ding, Anja K Mayer, Britta Baumann, Nicole Weisschuh, Ditta Zobor, Gesa-Astrid Hahn, Ulrich Kellner, Sascha Venturelli, Elvir Becirovic, Peter Charbel Issa, Robert K Koenekoop, Günther Rudolph, John Heckenlively, Paul Sieving, Richard G Weleber, Christian Hamel, Xiangang Zong, Martin Biel, Robert Lukowski, Matthias W Seeliger, Stylianos Michalakis, Bernd Wissinger, Peter Ruth
Mutations in CNGA3 and CNGB3, the genes encoding the subunits of the tetrameric cone photoreceptor cyclic nucleotide-gated ion channel, cause achromatopsia, a congenital retinal disorder characterized by loss of cone function. However, a small number of patients carrying the CNGB3/c.1208G>A;p.R403Q mutation present with a variable retinal phenotype ranging from complete and incomplete achromatopsia to moderate cone dysfunction or progressive cone dystrophy. By exploring a large patient cohort and published cases, we identified 16 unrelated individuals who were homozygous or (compound-)heterozygous for the CNGB3/c...
November 12, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30418170/stat3-a-link-between-camkii-%C3%AE-iv-spectrin-and-maladaptive-remodeling
#6
Mohit Hulsurkar, Ann P Quick, Xander Ht Wehrens
βIV-Spectrin, along with ankyrin and Ca2+/calmodulin-dependent kinase II (CaMKII), has been shown to form local signaling domains at the intercalated disc, while playing a key role in the regulation of Na+ and K+ channels in cardiomyocytes. In this issue of the JCI, Unudurthi et al. show that under chronic pressure overload conditions, CaMKII activation leads to βIV-spectrin degradation, resulting in the release of sequestered STAT3 from the intercalated discs. This in turn leads to dysregulation of STAT3-mediated gene transcription, maladaptive remodeling, fibrosis, and decreased cardiac function...
November 12, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30398465/dominant-negative-serping1-variants-cause-intracellular-retention-of-c1-inhibitor-in-hereditary-angioedema
#7
Didde Haslund, Laura Barrett Ryø, Sara Seidelin Majidi, Iben Kløvgaard Rose, Kristian Alsbjerg Skipper, Tue Fryland, Anja Bille Bohn, Claus Koch, Martin K Thomsen, Yaseelan Palarasah, Thomas J Corydon, Anette Bygum, Lene N Nejsum, Jacob Giehm Mikkelsen
Hereditary angioedema (HAE) is an autosomal dominant disease characterized by recurrent edema attacks associated with morbidity and mortality. HAE results from variations in the SERPING1 gene encoding C1 inhibitor (C1INH), a serine protease inhibitor (serpin). Reduced plasma levels of C1INH lead to enhanced activation of the contact system triggering high levels of bradykinin and increased vascular permeability, but the cellular mechanisms leading to low C1INH levels (20-30% of normal) in heterozygous HAE type I patients remain obscure...
November 6, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30395542/a-disease-mutation-reveals-a-role-for-nav1-9-in-acute-itch
#8
Juan Salvatierra, Marcelo Diaz-Bustamante, James Meixiong, Elaine Tierney, Xinzhong Dong, Frank Bosmans
Itch (pruritis) and pain represent two distinct sensory modalities; yet both have evolved to alert us to potentially harmful external stimuli. Compared with pain, our understanding of itch is still nascent. Here, we report a new clinical case of debilitating itch and altered pain perception resulting from the heterozygous de novo p.L811P gain-of-function mutation in NaV1.9, a voltage-gated sodium (NaV) channel subtype that relays sensory information from the periphery to the spine. To investigate the role of NaV1...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30395541/biallelic-mutations-in-dna-ligase-1-underlie-a-spectrum-of-immune-deficiencies
#9
Patrick Maffucci, Jose Chavez, Thomas J Jurkiw, Patrick J O'Brien, Jordan K Abbott, Paul R Reynolds, Austen Worth, Luigi D Notarangelo, Kerstin Felgentreff, Patricia Cortes, Bertrand Boisson, Lin Radigan, Aurélie Cobat, Chitra Dinakar, Mohammad Ehlayel, Tawfeg Ben-Omran, Erwin W Gelfand, Jean-Laurent Casanova, Charlotte Cunningham-Rundles
We report the molecular, cellular, and clinical features of 5 patients from 3 kindreds with biallelic mutations in the autosomal LIG1 gene encoding DNA ligase 1. The patients exhibited hypogammaglobulinemia, lymphopenia, increased proportions of circulating γδT cells, and erythrocyte macrocytosis. Clinical severity ranged from a mild antibody deficiency to a combined immunodeficiency requiring hematopoietic stem cell transplantation. Using engineered LIG1-deficient cell lines, we demonstrated chemical and radiation defects associated with the mutant alleles, which variably impaired the DNA repair pathway...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30395540/an-osteopontin-cd44-immune-checkpoint-controls-cd8-t-cell-activation-and-tumor-immune-evasion
#10
John D Klement, Amy V Paschall, Priscilla S Redd, Mohammed L Ibrahim, Chunwan Lu, Dafeng Yang, Esteban Celis, Scott I Abrams, Keiko Ozato, Kebin Liu
Despite breakthroughs in immune checkpoint inhibitor (ICI) immunotherapy, not all human cancers respond to ICI immunotherapy and a large fraction of patients with the responsive types of cancers do not respond to current ICI immunotherapy. This clinical conundrum suggests that additional immune checkpoints exist. We report here that interferon regulatory factor 8 (IRF8) deficiency led to impairment of cytotoxic T lymphocyte (CTL) activation and allograft tumor tolerance. However, analysis of chimera mice with competitive reconstitution of WT and IRF8-KO bone marrow cells as well as mice with IRF8 deficiency only in T cells indicated that IRF8 plays no intrinsic role in CTL activation...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30395539/plk1-a-promising-and-previously-unexplored-target-in-double-hit-lymphoma
#11
Quais N Hassan, Lapo Alinari, John C Byrd
Inhibitors that target specific kinases or oncoproteins have become popular additions to or replacements for cytotoxic chemotherapies to treat many different types of cancer. However, many tumors lack a discernable target kinase and an amplified oncoprotein and/or rely on several cooperating mechanisms for progression. Thus, combinations of targeted therapies are essential for treating many cancers to avoid the rapid emergence of resistance. In this issue of the JCI, Ren et al. use an elegant kinase activity-profiling method and identify activity of the oncogene polo-like kinase-1 (PLK1) as an important driver of double-hit lymphoma (DHL), an aggressive subgroup of B cell lymphoma characterized by chromosomal translocations involving c-MYC and BCL2 or BCL6...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30395538/androgen-receptor-functions-as-transcriptional-repressor-of-cancer-associated-fibroblast-activation
#12
Andrea Clocchiatti, Soumitra Ghosh, Maria-Giuseppina Procopio, Luigi Mazzeo, Pino Bordignon, Paola Ostano, Sandro Goruppi, Giulia Bottoni, Atul Katarkar, Mitchell Levesque, Peter Kölblinger, Reinhard Dummer, Victor Neel, Berna C Özdemir, G Paolo Dotto
The aging-associated increase of cancer risk is linked with stromal fibroblast senescence and concomitant cancer-associated fibroblast (CAF) activation. Surprisingly little is known about the role of androgen receptor (AR) signaling in this context. We have found downmodulated AR expression in dermal fibroblasts underlying premalignant skin cancer lesions (actinic keratoses and dysplastic nevi) as well as in CAFs from the 3 major skin cancer types, squamous cell carcinomas (SCCs), basal cell carcinomas, and melanomas...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30395537/osteopontin-controls-immunosuppression-in-the-tumor-microenvironment
#13
Michael R Shurin
Cancer cells evade the immune system through a variety of different mechanisms, including the inhibition of antitumor effector T cells via checkpoint ligand-receptor interaction. Moreover, studies have shown that blocking these checkpoint pathways can reinvigorate the antitumor immunity, thereby prompting the development of numerous checkpoint immunotherapies, several of which are now being approved to treat multiple types of cancer. However, only a fraction of patients achieves promising long-term outcomes in response to checkpoint inhibition, suggesting the existence of additional unknown tumor-induced immunosuppressive pathways...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30277472/cigarette-smoke-and-hiv-synergistically-affect-lung-pathology-in-cynomolgus-macaques
#14
Hitendra S Chand, Rodrigo Vazquez-Guillamet, Christopher Royer, Karin Rudolph, Neerad Mishra, Shashi P Singh, Shah S Hussain, Edward Barrett, Shannon Callen, Siddappa N Byrareddy, Maria Cristina Vazquez Guillamet, Jawad Abukhalaf, Aryaz Sheybani, Vernat Exil, Veena Raizada, Hemant Agarwal, Madhavan Nair, Francois Villinger, Shilpa Buch, Mohan Sopori
In the era of combined antiretroviral therapy (cART), lung diseases such as chronic bronchitis (CB) and chronic obstructive pulmonary disease (COPD) are common among persons living with HIV (PLWH), particularly smokers. Although smoking is highly prevalent among PLWH, HIV may be an independent risk factor for lung diseases; however, the role of HIV and cigarette smoke (CS) and their potential interaction in the development of chronic lung diseases among PLWH has not been delineated. To investigate this interaction, cynomolgus macaques were exposed to CS and/or simian-adapted human immunodeficiency virus (SHIV) and treated with cART...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30277471/cd84-regulates-pd-1-pd-l1-expression-and-function-in-chronic-lymphocytic-leukemia
#15
Hadas Lewinsky, Avital F Barak, Victoria Huber, Matthias P Kramer, Lihi Radomir, Lital Sever, Irit Orr, Vita Mirkin, Nili Dezorella, Mika Shapiro, Yosef Cohen, Lev Shvidel, Martina Seiffert, Yair Herishanu, Shirly Becker-Herman, Idit Shachar
Chronic lymphocytic leukemia (CLL) is characterized by clonal proliferation and progressive accumulation of mature B lymphocytes in the peripheral blood, lymphoid tissues, and bone marrow. CLL is characterized by profound immune defects leading to severe infectious complications. T cells are numerically, phenotypically, and functionally highly abnormal in CLL, with only limited ability to exert antitumor immune responses. Exhaustion of T cells has also been suggested to play an important role in antitumor responses...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30260324/plk1-stabilizes-a-myc-dependent-kinase-network-in-aggressive-b-cell-lymphomas
#16
Yuan Ren, Chengfeng Bi, Xiaohong Zhao, Tint Lwin, Cheng Wang, Ji Yuan, Ariosto S Silva, Bijal D Shah, Bin Fang, Tao Li, John M Koomen, Huijuan Jiang, Julio C Chavez, Lan V Pham, Praneeth R Sudalagunta, Lixin Wan, Xuefeng Wang, William S Dalton, Lynn C Moscinski, Kenneth H Shain, Julie Vose, John L Cleveland, Eduardo M Sotomayor, Kai Fu, Jianguo Tao
Concordant activation of MYC and BCL-2 oncoproteins in double-hit lymphoma (DHL) results in aggressive disease that is refractory to treatment. By integrating activity-based proteomic profiling and drug screens, polo-like kinase-1 (PLK1) was identified as an essential regulator of the MYC-dependent kinome in DHL. Notably, PLK1 was expressed at high levels in DHL, correlated with MYC expression, and connoted poor outcome. Further, PLK1 signaling augmented MYC protein stability, and in turn, MYC directly induced PLK1 transcription, establishing a feed-forward MYC-PLK1 circuit in DHL...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30260323/tumor-derived-micrornas-induce-myeloid-suppressor-cells-and-predict-immunotherapy-resistance-in-melanoma
#17
Veronica Huber, Viviana Vallacchi, Viktor Fleming, Xiaoying Hu, Agata Cova, Matteo Dugo, Eriomina Shahaj, Roberta Sulsenti, Elisabetta Vergani, Paola Filipazzi, Angela De Laurentiis, Luca Lalli, Lorenza Di Guardo, Roberto Patuzzo, Barbara Vergani, Elena Casiraghi, Mara Cossa, Ambra Gualeni, Valentina Bollati, Flavio Arienti, Filippo De Braud, Luigi Mariani, Antonello Villa, Peter Altevogt, Viktor Umansky, Monica Rodolfo, Licia Rivoltini
The accrual of myeloid-derived suppressor cells (MDSCs) represents a major obstacle to effective immunotherapy in cancer patients, but the mechanisms underlying this process in the human setting remain elusive. Here, we describe a set of microRNAs (miR-146a, miR-155, miR-125b, miR-100, let-7e, miR-125a, miR-146b, miR-99b) that are associated with MDSCs and resistance to treatment with immune checkpoint inhibitors in melanoma patients. The miRs were identified by transcriptional analyses as being responsible for the conversion of monocytes into MDSCs (CD14+HLA-DRneg cells) mediated by melanoma extracellular vesicles (EVs) and were shown to recreate MDSC features upon transfection...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30252677/antisense-stat3-inhibitor-decreases-viability-of-myelodysplastic-and-leukemic-stem-cells
#18
Aditi Shastri, Gaurav Choudhary, Margarida Teixeira, Shanisha Gordon-Mitchell, Nandini Ramachandra, Lumie Bernard, Sanchari Bhattacharyya, Robert Lopez, Kith Pradhan, Orsolya Giricz, Goutham Ravipati, Li-Fan Wong, Sally Cole, Tushar D Bhagat, Jonathan Feld, Yosman Dhar, Matthias Bartenstein, Victor J Thiruthuvanathan, Amittha Wickrema, B Hilda Ye, David A Frank, Andrea Pellagatti, Jacqueline Boultwood, Tianyuan Zhou, Youngsoo Kim, A Robert MacLeod, P K Epling-Burnette, Minwei Ye, Patricia McCoon, Richard Woessner, Ulrich Steidl, Britta Will, Amit Verma
Acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS) are associated with disease-initiating stem cells that are not eliminated by conventional therapies. Transcriptomic analysis of stem and progenitor populations in MDS and AML demonstrated overexpression of STAT3 that was validated in an independent cohort. STAT3 overexpression was predictive of a shorter survival and worse clinical features in a large MDS cohort. High STAT3 expression signature in MDS CD34+ cells was similar to known preleukemic gene signatures...
November 5, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30383540/an-airway-epithelial-il-17a-response-signature-identifies-a-steroid-unresponsive-copd-patient-subgroup
#19
Stephanie A Christenson, Maarten van den Berge, Alen Faiz, Kai Imkamp, Nirav Bhakta, Luke R Bonser, Lorna T Zlock, Igor Z Barjaktarevic, R Graham Barr, Eugene R Bleecker, Richard C Boucher, Russell P Bowler, Alejandro P Comellas, Jeffrey L Curtis, MeiLan K Han, Nadia N Hansel, Pieter S Hiemstra, Robert J Kaner, Jerry A Krishnan, Fernando J Martinez, Wanda K O'Neal, Robert Paine Iii, Wim Timens, J Michael Wells, Avrum Spira, David J Erle, Prescott G Woodruff
BACKGROUND: Chronic Obstructive Pulmonary Disease (COPD) is a heterogeneous smoking-related disease characterized by airway obstruction and inflammation. This inflammation may persist even after smoking cessation and responds variably to corticosteroids. Personalizing treatment to biologically similar "molecular phenotypes" may improve therapeutic efficacy in COPD. IL-17A is involved in neutrophilic inflammation and corticosteroid resistance, and thus may be particularly important in a COPD molecular phenotype...
November 1, 2018: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/30382946/sialic-acid-is-a-critical-fetal-defense-against-maternal-complement-attack
#20
Markus Abeln, Iris Albers, Ulrike Peters-Bernard, Kerstin Flächsig-Schulz, Elina Kats, Andreas Kispert, Stephen Tomlinson, Rita Gerardy-Schahn, Anja Münster-Kühnel, Birgit Weinhold
The negatively charged sugar sialic acid (Sia) occupies the outermost position in the bulk of cell surface glycans. Lack of sialylated glycans due to genetic ablation of the Sia activating enzyme CMP-sialic acid synthase (CMAS) resulted in embryonic lethality around day 9.5 post coitum (E9.5) in mice. Developmental failure was caused by complement activation on trophoblasts in Cmas-/- implants accompanied by infiltration of maternal neutrophils at the fetal-maternal interface, intrauterine growth restriction, impaired placental development and a thickened Reichert's membrane...
November 1, 2018: Journal of Clinical Investigation
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