scholarly journals Roles of Proteoglycans and Glycosaminoglycans in Wound Healing and Fibrosis

2015 ◽  
Vol 2015 ◽  
pp. 1-20 ◽  
Author(s):  
Shibnath Ghatak ◽  
Edward V. Maytin ◽  
Judith A. Mack ◽  
Vincent C. Hascall ◽  
Ilia Atanelishvili ◽  
...  
Keyword(s):  
Wound Healing ◽  
Blood Cells ◽  
White Blood Cells ◽  
Cell Types ◽  
Repair Process ◽  
Epithelial Layer ◽  
Extracellular Molecules ◽  
Living Tissues ◽  
Type Of Injury

A wound is a type of injury that damages living tissues. In this review, we will be referring mainly to healing responses in the organs including skin and the lungs.Fibrosisis a process of dysregulated extracellular matrix (ECM) production that leads to a dense and functionally abnormal connective tissue compartment (dermis). In tissues such as the skin, the repair of the dermis after wounding requires not only thefibroblaststhat produce the ECM molecules, but also the overlying epithelial layer (keratinocytes), theendothelial cells, andsmooth muscle cellsof the blood vessel and white blood cells such asneutrophilsandmacrophages, which together orchestrate the cytokine-mediated signaling and paracrine interactions that are required to regulate the proper extent and timing of the repair process. This review will focus on the importance of extracellular molecules in the microenvironment, primarily the proteoglycans and glycosaminoglycan hyaluronan, and their roles in wound healing. First, we will briefly summarize the physiological, cellular, and biochemical elements of wound healing, including the importance of cytokine cross-talk between cell types. Second, we will discuss the role of proteoglycans and hyaluronan in regulating these processes. Finally, approaches that utilize these concepts as potential therapies for fibrosis are discussed.

scholarly journals Rapid and sustained hematopoietic recovery in lethally irradiated mice transplanted with purified Thy-1.1lo Lin-Sca-1+ hematopoietic stem cells

Blood ◽  
1994 ◽  
Vol 83 (12) ◽  
pp. 3758-3779 ◽  
Author(s):  
N Uchida ◽  
HL Aguila ◽  
WH Fleming ◽  
L Jerabek ◽  
IL Weissman
Keyword(s):  
Stem Cells ◽  
Hematopoietic Stem Cells ◽  
Blood Cells ◽  
Critical Role ◽  
White Blood Cells ◽  
Cell Types ◽  
Dose Dependence ◽  
Hematopoietic Stem ◽  
Hematopoietic Recovery

Abstract Hematopoietic stem cells (HSCs) are believed to play a critical role in the sustained repopulation of all blood cells after bone marrow transplantation (BMT). However, understanding the role of HSCs versus other hematopoietic cells in the quantitative reconstitution of various blood cell types has awaited methods to isolate HSCs. A candidate population of mouse HSCs, Thy-1.1lo Lin-Sca-1+ cells, was isolated several years ago and, recently, this population has been shown to be the only population of BM cells that contains HSCs in C57BL/Ka-Thy-1.1 mice. As few as 100 of these cells can radioprotect 95% to 100% of irradiated mice, resulting long-term multilineage reconstitution. In this study, we examined the reconstitution potential of irradiated mice transplanted with purified Thy-1.1lo Lin-Sca-1+ BM cells. Donor-derived peripheral blood (PB) white blood cells were detected as early as day 9 or 10 when 100 to 1,000 Thy-1.1lo Lin-Sca-1+ cells were used, with minor dose-dependent differences. The reappearance of platelets by day 14 and thereafter was also seen at all HSC doses (100 to 1,000 cells), with a slight dose-dependence. All studied HSC doses also allowed RBC levels to recover, although at the 100 cell dose a delay in hematocrit recovery was observed at day 14. When irradiated mice were transplanted with 500 Thy-1.1lo Lin-Sca-1+ cells compared with 1 x 10(6) BM cells (the equivalent amount of cells that contain 500 Thy-1.1lo Lin-Sca-1+ cells as well as progenitor and mature cells), very little difference in the kinetics of recovery of PB, white blood cells, platelets, and hematocrit was observed. Surprisingly, even when 200 Thy1.1lo Lin-Sca- 1+ cells were mixed with 4 x 10(5) Sca-1- BM cells in a competitive repopulation assay, most of the early (days 11 and 14) PB myeloid cells were derived from the HSC genotype, indicating the superiority of the Thy-1.1lo Lin-Sca-1+ cells over Sca-1- cells even in the early phases of myeloid reconstitution. Within the Thy-1.1lo Lin-Sca-1+ population, the Rhodamine 123 (Rh123)hi subset dominates in PB myeloid reconstitution at 10 to 14 days, only to be overtaken by the Rh123lo subset at 3 weeks and thereafter. These findings indicate that HSCs can account for the early phase of hematopoietic recovery, as well as sustained hematopoiesis, and raise questions about the role of non-HSC BM populations in the setting of BMT.

scholarly journals Rapid and sustained hematopoietic recovery in lethally irradiated mice transplanted with purified Thy-1.1lo Lin-Sca-1+ hematopoietic stem cells

Blood ◽  
1994 ◽  
Vol 83 (12) ◽  
pp. 3758-3779 ◽  
Author(s):  
N Uchida ◽  
HL Aguila ◽  
WH Fleming ◽  
L Jerabek ◽  
IL Weissman
Keyword(s):  
Stem Cells ◽  
Hematopoietic Stem Cells ◽  
Blood Cells ◽  
Critical Role ◽  
White Blood Cells ◽  
Cell Types ◽  
Dose Dependence ◽  
Hematopoietic Stem ◽  
Hematopoietic Recovery

Hematopoietic stem cells (HSCs) are believed to play a critical role in the sustained repopulation of all blood cells after bone marrow transplantation (BMT). However, understanding the role of HSCs versus other hematopoietic cells in the quantitative reconstitution of various blood cell types has awaited methods to isolate HSCs. A candidate population of mouse HSCs, Thy-1.1lo Lin-Sca-1+ cells, was isolated several years ago and, recently, this population has been shown to be the only population of BM cells that contains HSCs in C57BL/Ka-Thy-1.1 mice. As few as 100 of these cells can radioprotect 95% to 100% of irradiated mice, resulting long-term multilineage reconstitution. In this study, we examined the reconstitution potential of irradiated mice transplanted with purified Thy-1.1lo Lin-Sca-1+ BM cells. Donor-derived peripheral blood (PB) white blood cells were detected as early as day 9 or 10 when 100 to 1,000 Thy-1.1lo Lin-Sca-1+ cells were used, with minor dose-dependent differences. The reappearance of platelets by day 14 and thereafter was also seen at all HSC doses (100 to 1,000 cells), with a slight dose-dependence. All studied HSC doses also allowed RBC levels to recover, although at the 100 cell dose a delay in hematocrit recovery was observed at day 14. When irradiated mice were transplanted with 500 Thy-1.1lo Lin-Sca-1+ cells compared with 1 x 10(6) BM cells (the equivalent amount of cells that contain 500 Thy-1.1lo Lin-Sca-1+ cells as well as progenitor and mature cells), very little difference in the kinetics of recovery of PB, white blood cells, platelets, and hematocrit was observed. Surprisingly, even when 200 Thy1.1lo Lin-Sca- 1+ cells were mixed with 4 x 10(5) Sca-1- BM cells in a competitive repopulation assay, most of the early (days 11 and 14) PB myeloid cells were derived from the HSC genotype, indicating the superiority of the Thy-1.1lo Lin-Sca-1+ cells over Sca-1- cells even in the early phases of myeloid reconstitution. Within the Thy-1.1lo Lin-Sca-1+ population, the Rhodamine 123 (Rh123)hi subset dominates in PB myeloid reconstitution at 10 to 14 days, only to be overtaken by the Rh123lo subset at 3 weeks and thereafter. These findings indicate that HSCs can account for the early phase of hematopoietic recovery, as well as sustained hematopoiesis, and raise questions about the role of non-HSC BM populations in the setting of BMT.

scholarly journals The Enigma of Eosinophil Degranulation

2021 ◽  
Vol 22 (13) ◽  
pp. 7091
Author(s):  
Timothée Fettrelet ◽  
Lea Gigon ◽  
Alexander Karaulov ◽  
Shida Yousefi ◽  
Hans-Uwe Simon
Keyword(s):  
Blood Cells ◽  
Inflammatory Diseases ◽  
White Blood Cells ◽  
Exact Role ◽  
Effector Cells ◽  
Effector Functions ◽  
Cytotoxic Effector ◽  
Eosinophil Degranulation

Eosinophils are specialized white blood cells, which are involved in the pathology of diverse allergic and nonallergic inflammatory diseases. Eosinophils are traditionally known as cytotoxic effector cells but have been suggested to additionally play a role in immunomodulation and maintenance of homeostasis. The exact role of these granule-containing leukocytes in health and diseases is still a matter of debate. Degranulation is one of the key effector functions of eosinophils in response to diverse stimuli. The different degranulation patterns occurring in eosinophils (piecemeal degranulation, exocytosis and cytolysis) have been extensively studied in the last few years. However, the exact mechanism of the diverse degranulation types remains unknown and is still under investigation. In this review, we focus on recent findings and highlight the diversity of stimulation and methods used to evaluate eosinophil degranulation.

Candida albicans Shunt Infection: Report of Two Cases

Neurosurgery ◽  
1986 ◽  
Vol 19 (1) ◽  
pp. 111-113 ◽  
Author(s):  
David J. Gower ◽  
Kerry Crone ◽  
Eben Alexander ◽  
David L. Kelly
Keyword(s):  
Candida Albicans ◽  
Blood Cells ◽  
White Blood Cells ◽  
Shunt Infection ◽  
Cerebrospinal Fluid Shunts ◽  
Previous Therapy ◽  
Relationship Of ◽  
The Relationship ◽  
Overall Mortality

Abstract Infection of cerebrospinal fluid shunts with Candida albicans is reported in two patients. Scanning electron microscopy in one case demonstrates the relationship of the Candida hyphae to the white blood cells and to silicone plastic. A review of 10 previously reported cases of Candida shunt infection indicates that the infection usually follows a major bacterial infection or direct contamination or occurs spontaneously, Previous therapy has usually involved removal of the shunt, and the role of parenteral antifungal therapy is still unclear. Overall mortality to date is 25%.

scholarly journals Human-level recognition of blast cells in acute myeloid leukemia with convolutional neural networks

2019 ◽  
Author(s):  
Christian Matek ◽  
Simone Schwarz ◽  
Karsten Spiekermann ◽  
Carsten Marr
Keyword(s):  
Acute Myeloid Leukemia ◽  
Blood Cells ◽  
Myeloid Leukemia ◽  
White Blood Cells ◽  
Cell Types ◽  
Hematologic Malignancies ◽  
Malignant Cell ◽  
Morphological Examination ◽  
Blast Cells ◽  
Acute Myeloid

AbstractReliable recognition of malignant white blood cells is a key step in the diagnosis of hematologic malignancies such as Acute Myeloid Leukemia. Microscopic morphological examination of blood cells is usually performed by trained human examiners, making the process tedious, time-consuming and hard to standardise.We compile an annotated image dataset of over 18,000 white blood cells, use it to train a convolutional neural network for leukocyte classification, and evaluate the network’s performance. The network classifies the most important cell types with high accuracy. It also allows us to decide two clinically relevant questions with human-level performance, namely (i) if a given cell has blast character, and (ii) if it belongs to the cell types normally present in non-pathological blood smears.Our approach holds the potential to be used as a classification aid for examining much larger numbers of cells in a smear than can usually be done by a human expert. This will allow clinicians to recognize malignant cell populations with lower prevalence at an earlier stage of the disease.

scholarly journals Klasifikasi Sel Darah Putih dan Sel Limfoblas Menggunakan Metode Multilayer Perceptron Backpropagation

2019 ◽  
Vol 9 (2) ◽  
pp. 173
Author(s):  
Apri Nur Liyantoko ◽  
Ika Candradewi ◽  
Agus Harjoko
Keyword(s):  
Blood Cell ◽  
White Blood Cell ◽  
Blood Cells ◽  
White Blood Cells ◽  
Back Propagation ◽  
Cell Types ◽  
Diagnostic Process ◽  
The Subject ◽  
Processing Techniques

 Leukemia is a type of cancer that is on white blood cell. This disease are characterized by abundance of abnormal white blood cell called lymphoblast in the bone marrow. Classification of blood cell types, calculation of the ratio of cell types and comparison with normal blood cells can be the subject of diagnosing this disease. The diagnostic process is carried out manually by hematologists through microscopic image. This method is likely to provide a subjective result and time-consuming.The application of digital image processing techniques and machine learning in the process of classifying white blood cells can provide more objective results. This research used thresholding method as segmentation and  multilayer method of back propagation perceptron with variations in the extraction of textural features, geometry, and colors. The results of segmentation testing in this study amounted to 68.70%. Whereas the classification test shows that the combination of feature extraction of GLCM features, geometry features, and color features gives the best results. This test produces an accuration value 91.43%, precision value of 50.63%, sensitivity 56.67%, F1Score 51.95%, and specitifity 94.16%.

Nonmalignant Disorders of Leukocytes

2011 ◽  
Author(s):  
Alison M. Schram ◽  
Nancy Berliner
Keyword(s):  
Blood Cells ◽  
Langerhans Cell Histiocytosis ◽  
White Blood Cells ◽  
Cell Types ◽  
Immune Defense ◽  
Cancer Surveillance ◽  
Vasoactive Substances ◽  
Clinical Disorders ◽  
Life Threatening ◽  
And Function

Leukocytes, also known as white blood cells, are hematologic cells important for a host’s immune defense. They comprise several diverse cell types including lymphocytes, neutrophils, monocytes, macrophages, and eosinophils. Each plays a unique and important role in fighting infection, cancer surveillance, and maintaining immune homeostasis. Leukocytes exert their effect and interact with host and foreign cells through the release of cytokines, chemokines, enzymes, and vasoactive substances. Altered number and function of these cells can lead to clinical disorders that range from benign to severe and life-threatening. Here we review the diagnosis, natural history, and treatment of nonmalignant disorders of leukocytes. This review contains 100 references, 6 figures, and 9 tables. Key Words: eosinophilia, hemophagocytic histiocytosis, Langerhans cell histiocytosis, lymphocytopenia, lymphocytosis mastocytosis, neutropenia, neutrophilia

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