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Clearance of apoptotic cells

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https://www.readbyqxmd.com/read/28653619/semen-amyloids-participate-in-spermatozoa-selection-and-clearance
#1
Nadia R Roan, Nathallie Sandi-Monroy, Nargis Kohgadai, Shariq M Usmani, Katherine G Hamil, Jason Neidleman, Mauricio Montano, Ludger Ständker, Annika Röcker, Marielle Cavrois, Jared Rosen, Kara Marson, James F Smith, Christopher D Pilcher, Friedrich Gagsteiger, Olena Sakk, Michael O'Rand, Polina V Lishko, Frank Kirchhoff, Jan Münch, Warner C Greene
Unlike other human biological fluids, semen contains multiple types of amyloid fibrils in the absence of disease. These fibrils enhance HIV infection by promoting viral fusion to cellular targets, but their natural function remained unknown. The similarities shared between HIV fusion to host cell and sperm fusion to oocyte led us to examine whether these fibrils promote fertilization. Surprisingly, the fibrils inhibited fertilization by immobilizing sperm. Interestingly, however, this immobilization facilitated uptake and clearance of sperm by macrophages, which are known to infiltrate the female reproductive tract (FRT) following semen exposure...
June 27, 2017: ELife
https://www.readbyqxmd.com/read/28643236/multi-reservoir-phospholipid-shell-encapsulating-protamine-nanocapsules-for-co-delivery-of-letrozole-and-celecoxib-in-breast-cancer-therapy
#2
Ahmed O Elzoghby, Shaimaa K Mostafa, Maged W Helmy, Maha A ElDemellawy, Salah A Sheweita
PURPOSE: In the current work, we propose a combined delivery nanoplatform for letrozole (LTZ) and celecoxib (CXB). METHODS: Multi-reservoir nanocarriers were developed by enveloping protamine nanocapsules (PRM-NCs) within drug-phospholipid complex bilayer. RESULTS: Encapsulation of NCs within phospholipid bilayer was confirmed by both size increase from 109.7 to 179.8 nm and reduction of surface charge from +19.0 to +7.78 mV. The multi-compartmental core-shell structure enabled biphasic CXB release with initial fast release induced by complexation with phospholipid shell followed by prolonged release from oily core...
June 22, 2017: Pharmaceutical Research
https://www.readbyqxmd.com/read/28630102/the-phenotype-and-function-of-preterm-infant-monocytes-implications-for-susceptibility-to-infection
#3
REVIEW
Emma de Jong, Tobias Strunk, David Burgner, Pascal M Lavoie, Andrew Currie
The extreme vulnerability of preterm infants to invasive microbial infections has been attributed to "immature" innate immune defenses. Monocytes are important innate immune sentinel cells critical in the defense against infection in blood. They achieve this via diverse mechanisms that include pathogen recognition receptor- and inflammasome-mediated detection of microbes, migration into infected tissues, and differentiation into Mϕs and dendritic cells, initiation of the inflammatory cascade by free radicals and cytokine/chemokine production, pathogen clearance by phagocytosis and intracellular killing, and the removal of apoptotic cells...
June 19, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28623098/acquired-inhibition-of-microrna-124-protects-against-spinal-cord-ischemia-reperfusion-injury-partially-through-a-mitophagy-dependent-pathway
#4
Kun Liu, Lihui Yan, Xiaojing Jiang, Yang Yu, Hongbo Liu, Tianxiang Gu, Enyi Shi
OBJECTIVE: Mitophagy results in selective clearance of damaged mitochondria. We investigated whether mitophagy was involved in the neuroprotection by inhibiting microRNA (miRNA)-124 on ischemic spinal cords. METHODS: Inhibition of miRNA-124 was conducted by intrathecal injection of lentivirus vectors containing antagomiR-124. Spinal cord ischemia was induced in rats by crossclamping the descending aorta just distal to the left subclavian artery for 14 minutes. Hind-limb motor function was assessed with the motor deficit index (MDI)...
May 23, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28621306/targeted-two-photon-chemical-apoptotic-ablation-of-defined-cell-types-in-vivo
#5
Robert A Hill, Eyiyemisi C Damisah, Fuyi Chen, Alex C Kwan, Jaime Grutzendler
A major bottleneck limiting understanding of mechanisms and consequences of cell death in complex organisms is the inability to induce and visualize this process with spatial and temporal precision in living animals. Here we report a technique termed two-photon chemical apoptotic targeted ablation (2Phatal) that uses focal illumination with a femtosecond-pulsed laser to bleach a nucleic acid-binding dye causing dose-dependent apoptosis of individual cells without collateral damage. Using 2Phatal, we achieve precise ablation of distinct populations of neurons, glia and pericytes in the mouse brain and in zebrafish...
June 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28620383/ly6c-hi-monocytes-and-their-macrophage-descendants-regulate-neutrophil-function-and-clearance-in-acetaminophen-induced-liver-injury
#6
Nadine Graubardt, Milena Vugman, Odelia Mouhadeb, Gabriele Caliari, Metsada Pasmanik-Chor, Debby Reuveni, Ehud Zigmond, Eli Brazowski, Eyal David, Lousie Chappell-Maor, Steffen Jung, Chen Varol
Monocyte-derived macrophages (MoMF) play a pivotal role in the resolution of acetaminophen-induced liver injury (AILI). Timely termination of neutrophil activity and their clearance are essential for liver regeneration following injury. Here, we show that infiltrating Ly6C(hi) monocytes, their macrophage descendants, and neutrophils spatially and temporally overlap in the centrilobular necrotic areas during the necroinflammatory and resolution phases of AILI. At the necroinflammatory phase, inducible ablation of circulating Ly6C(hi) monocytes resulted in reduced numbers and fractions of reactive oxygen species (ROS)-producing neutrophils...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28617431/nicotine-protects-rat-hypoglossal-motoneurons-from-excitotoxic-death-via-downregulation-of-connexin-36
#7
Silvia Corsini, Maria Tortora, Rossana Rauti, Andrea Nistri
Motoneuron disease including amyotrophic lateral sclerosis may be due, at an early stage, to deficit in the extracellular clearance of the excitatory transmitter glutamate. A model of glutamate-mediated excitotoxic cell death based on pharmacological inhibition of its uptake was used to investigate how activation of neuronal nicotinic receptors by nicotine may protect motoneurons. Hypoglossal motoneurons (HMs) in neonatal rat brainstem slices were exposed to the glutamate uptake blocker DL-threo-β-benzyloxyaspartate (TBOA) that evoked large Ca(2+) transients time locked among nearby HMs, whose number fell by about 30% 4 h later...
June 15, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28602951/ced-10-wasp-arp2-3-signaling-axis-regulates-apoptotic-cell-corpse-engulfment-in-c-elegans
#8
Dou Wu, Yongping Chai, Zhiwen Zhu, Wenjing Li, Guangshuo Ou, Wei Li
Efficient clearance of apoptotic cells is essential for tissue homeostasis in metazoans. Genetic studies in Caenorhabditis elegans have identified signaling cascades that activate CED-10/Rac1 GTPase and promote actin cytoskeletal rearrangement during apoptotic cell engulfment. However, the molecular connection between CED-10 activation and actin reorganization remains elusive. Here, we provide evidence that CED-10 binds to the Arp2/3 nucleation promoting factor WASP; CED-10 recruits WASP and Arp2/3 to apoptotic cell corpses in the phagocytes...
June 9, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28601327/milk-fat-globule-epidermal-growth-factor-factor-viii-attenuates-sepsis-induced-acute-kidney-injury
#9
Cindy Cen, Monowar Aziz, Weng-Lang Yang, Mian Zhou, Jeffrey M Nicastro, Gene F Coppa, Ping Wang
BACKGROUND: Acute kidney injury (AKI) is most commonly caused by sepsis in critically ill patients, and it is associated with high morbidity and mortality. The pathophysiology of sepsis-induced AKI is generally accepted to include direct inflammatory injury, endothelial cell dysfunction, and apoptosis. Milk fat globule-epidermal growth factor-factor VIII (MFG-E8) is a secretory glycoprotein with a known role in the enhancement of apoptotic cell clearance and regulation of inflammation...
June 1, 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28557543/impaired-mitochondrial-microbicidal-responses-in-chronic-obstructive-pulmonary-disease-macrophages
#10
Martin A Bewley, Julie A Preston, Mohammed Mohasin, Helen M Marriott, Richard C Budd, Julie Swales, Paul Collini, David R Greaves, Ruth W Craig, Christopher E Brightling, Louise E Donnelly, Peter J Barnes, Dave Singh, Steven D Shapiro, Moira K B Whyte, David H Dockrell
RATIONALE: Chronic obstructive pulmonary disease (COPD) is characterized by impaired clearance of pulmonary bacteria. OBJECTIVES: The effect of COPD on alveolar macrophage (AM) microbicidal responses was investigated. METHODS: Alveolar macrophages (AMs) were obtained from bronchoalveolar lavage from healthy donors or COPD patients and challenged with opsonized serotype 14 Streptococcus pneumoniae. Cells were assessed for apoptosis, bactericidal activity and mitochondrial reactive oxygen species (mROS) production...
May 30, 2017: American Journal of Respiratory and Critical Care Medicine
https://www.readbyqxmd.com/read/28536576/implication-of-apoptosis-for-the-pathogenesis-of-trypanosoma-cruzi-infection
#11
REVIEW
Débora Decote-Ricardo, Marise P Nunes, Alexandre Morrot, Celio G Freire-de-Lima
Apoptosis is induced during the course of immune response to different infectious agents, and the ultimate fate is the recognition and uptake of apoptotic bodies by neighboring cells or by professional phagocytes. Apoptotic cells expose specific ligands to a set of conserved receptors expressed on macrophage cellular surface, which are the main cells involved in the clearance of the dying cells. These scavenger receptors, besides triggering the production of anti-inflammatory factors, also block the production of inflammatory mediators by phagocytes...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28532681/resveratrol-protects-neuronal-like-cells-expressing-mutant-huntingtin-from-dopamine-toxicity-by-rescuing-atg4-mediated-autophagosome-formation
#12
Chiara Vidoni, Eleonora Secomandi, Andrea Castiglioni, Mariarosa A B Melone, Ciro Isidoro
Parkinsonian-like motor deficits in Huntington's Disease (HD) patients are associated with abnormal dopamine neurotransmission in the striatum. Dopamine metabolism leads to the formation of oxidized dopamine quinones that exacerbates mitochondrial dysfunction with production of reactive oxygen species (ROS) that eventually lead to neuronal cell death. We have previously shown that dopamine-induced oxidative stress triggers apoptotic cell death in dopaminergic neuroblastoma SH-SY5Y cells hyper-expressing the mutant polyQ Huntingtin (polyQ-Htt) protein...
May 19, 2017: Neurochemistry International
https://www.readbyqxmd.com/read/28526177/two-cell-populations-participate-in-clearance-of-damaged-hair-cells-from-the-sensory-epithelia-of-the-inner-ear
#13
REVIEW
Keiko Hirose, Mark A Rutherford, Mark E Warchol
The cochlea and the vestibular organs are populated by resident macrophages, but their role in inner ear maintenance and pathology is not entirely clear. Resident macrophages in other organs are responsible for phagocytosis of injured or infected cells, and it is likely that macrophages in the inner ear serve a similar role. Hair cell injury causes macrophages to accumulate within proximity of damaged regions of the inner ear, either by exiting the vasculature and entering the labyrinth or by the resident macrophages reorganizing themselves through local movement to the areas of injury...
April 28, 2017: Hearing Research
https://www.readbyqxmd.com/read/28514691/mast-cells-are-crucial-for-induction-of-group-2-innate-lymphoid-cells-and-clearance-of-helminth-infections
#14
Chikako Shimokawa, Takashi Kanaya, Masami Hachisuka, Kenji Ishiwata, Hajime Hisaeda, Yosuke Kurashima, Hiroshi Kiyono, Tomohiro Yoshimoto, Tsuneyasu Kaisho, Hiroshi Ohno
Mast cells are important for eradication of intestinal nematodes; however, their precise mechanisms of action have remained elusive, especially in the early phase of infection. We found that Spi-B-deficient mice had increased numbers of mast cells and rapidly expelled the Heligmosomoides polygyrus (Hp) nematode. This was accompanied by induction of interleukin-13 (IL-13)-producing group 2 innate lymphoid cells (ILC2) and goblet cell hyperplasia. Immediately after Hp infection, mast cells were rapidly activated to produce IL-33 in response to ATP released from apoptotic intestinal epithelial cells...
May 16, 2017: Immunity
https://www.readbyqxmd.com/read/28512459/in-vivo-chronic-stimulation-unveils-autoreactive-potential-of-wiskott-aldrich-syndrome-protein-deficient-b-cells
#15
Maria Carmina Castiello, Francesca Pala, Lucia Sereni, Elena Draghici, Donato Inverso, Aisha V Sauer, Francesca Schena, Elena Fontana, Enrico Radaelli, Paolo Uva, Karla E Cervantes-Luevano, Federica Benvenuti, Pietro L Poliani, Matteo Iannacone, Elisabetta Traggiai, Anna Villa, Marita Bosticardo
Wiskott-Aldrich syndrome (WAS) is a primary immunodeficiency caused by mutations in the gene encoding the hematopoietic-specific WAS protein (WASp). WAS is frequently associated with autoimmunity, indicating a critical role of WASp in maintenance of tolerance. The role of B cells in the induction of autoreactive immune responses in WAS has been investigated in several settings, but the mechanisms leading to the development of autoimmune manifestations have been difficult to evaluate in the mouse models of the disease that do not spontaneously develop autoimmunity...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28511434/anti-c1q-antibody-is-associated-with-renal-and-cutaneous-manifestations-in-asian-indian-patients-with-systemic-lupus-erythematosus
#16
Jayakanthan Kabeerdoss, Nikhil Gupta, Sandhya Pulukool, Hindhumathi Mohan, Gowri Mahasampath, Debashish Danda
INTRODUCTION: C1q play an important role in clearance of immune complexes and apoptotic cell debris. Impaired clearance leads to exposure of C1 native antigen and development of anti-C1q antibody formation. Anti-C1q antibody is well studied in Systemic Lupus Erythematosus (SLE). Significance of anti-C1q Ab in Indian SLE patients and their clinical manifestations is not clear. AIM: The aim of this study was to investigate associations between anti-C1q antibody and clinical as well as serological markers of SLE...
March 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28496201/engulfment-signals-and-the-phagocytic-machinery-for-apoptotic-cell-clearance
#17
REVIEW
Seung-Yoon Park, In-San Kim
The clearance of apoptotic cells is an essential process for tissue homeostasis. To this end, cells undergoing apoptosis must display engulfment signals, such as 'find-me' and 'eat-me' signals. Engulfment signals are recognized by multiple types of phagocytic machinery in phagocytes, leading to prompt clearance of apoptotic cells. In addition, apoptotic cells and phagocytes release tolerogenic signals to reduce immune responses against apoptotic cell-derived self-antigens. Here we discuss recent advances in our knowledge of engulfment signals, the phagocytic machinery and the signal transduction pathways for apoptotic cell engulfment...
May 12, 2017: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/28495524/granulomatosis-with-polyangiitis-wegener-granulomatosis-a-proteinase-3-driven-disease
#18
Véronique Witko-Sarsat, Nathalie Thieblemont
Granulomatosis with polyangiitis (GPA, Wegener granulomatosis) is a systemic autoimmune vasculitis that affects small arteries, arterioles, and capillaries, most notably in the kidneys and lungs. In this disease, proteinase-3 (PR3), produced by neutrophils, is targeted by antineutrophil cytoplasmic antibodies (ANCA). Recent work by our group has shown how PR3 impairs the resolution of inflammation and deregulates the immune system. Normally, the clearance of activated neutrophils triggers an anti-inflammatory, pro-resolution process...
May 8, 2017: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/28473436/dba-2j-haplotype-on-distal-chromosome-2-reduces-mertk-expression-restricts-efferocytosis-and-increases-susceptibility-to-atherosclerosis
#19
Yukako Kayashima, Natalia Makhanova, Nobuyo Maeda
OBJECTIVE: Arch atherosclerosis 4 (Aath4) is a quantitative trait locus for atherosclerotic plaque formation in the inner curve of the aortic arch previously identified in an F2 cross of Apoe(-/-) mice on DBA/2J and 129S6 backgrounds. Mertk, coding for a ligand-activated transmembrane tyrosine kinase, is a candidate gene within the same chromosomal region. Our objective was to determine whether strain differences in Mertk influence plaque formation. APPROACH AND RESULTS: To dissect the strain effects of Mertk on atherosclerosis, we first established a congenic mouse line (Aath4a(DBA/DBA) ) in which a 5' region of Aath4 of DBA/2J, including Mertk, was backcrossed onto a 129S6-Apoe(-/-) background...
May 4, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/28461251/mitophagy-and-age-related-pathologies-development-of-new-therapeutics-by-targeting-mitochondrial-turnover
#20
REVIEW
Konstantinos Palikaras, Ioanna Daskalaki, Maria Markaki, Nektarios Tavernarakis
Mitochondria are highly dynamic and semi-autonomous organelles, essential for many fundamental cellular processes, including energy production, metabolite synthesis, ion homeostasis, lipid metabolism and initiation of apoptotic cell death. Proper mitochondrial physiology is a prerequisite for health and survival. Generation of new and removal of damaged or unwanted mitochondria are tightly controlled processes that need to be accurately coordinated for the maintenance of mitochondrial and cellular homeostasis...
April 28, 2017: Pharmacology & Therapeutics
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