scholarly journals Ultrastructural localization of CMPase, TPPase, and NADPase activity in neurons, satellite cells, and Schwann cells in frog dorsal root ganglia.

1989 ◽  
Vol 37 (2) ◽  
pp. 165-172 ◽  
Author(s):  
G Bennett ◽  
R Hemming
Keyword(s):  
Schwann Cells ◽  
Dorsal Root Ganglia ◽  
Dorsal Root ◽  
Ultrastructural Localization ◽  
Cell Types ◽  
Structure And Function ◽  
Similar Distribution ◽  
Thiamine Pyrophosphatase ◽  
And Function ◽  
Different Cell Types

Sections of bullfrog dorsal root ganglia were analyzed for cytidine monophosphatase (CMPase), thiamine pyrophosphatase (TPPase), and nicotinamide adenine dinucleotide phosphatase (NADPase) activity, and the distributions of these enzymatic activities were compared with those traditionally found in other cell types (e.g., CMPase: Golgi trans-sacculotubular network; TPPase: trans-Golgi saccule(s); NADPase: intermediate Golgi saccules). In the present study, CMPase activity in neurons was localized mainly to the Golgi trans-sacculotubular network and lysosomes, but sometimes also occurred at the ends of the trans and most distal intermediate Golgi saccules. A similar distribution was found in satellite and Schwann cells. TPPase activity in neurons occurred not only in the trans-Golgi saccule but also in the trans-sacculotubular network, lysosomes, and scattered tubular elements. In satellite and Schwann cells, activity was found in both the trans saccule and trans-sacculotubular network, and substantial activity often appeared in the more distal of the intermediate saccules. NADPase activity in neurons was usually absent from the intermediate Golgi saccules and was confined to the trans-sacculotubular network and lysosomes; however, activity was sometimes also found in the intermediate and/or trans-Golgi saccules. In satellite and Schwann cells, activity appeared consistently in both the trans-sacculotubular network and intermediate saccules, as well as in lysosomes. These distributions, especially in the case of TPPase and NADPase, differ substantially from the most frequently reported localizations of the above enzymes, indicating that the Golgi complex may exhibit considerable plasticity of structure and function in different cell types.

Spatial epigenetics: linking nuclear structure and function in higher eukaryotes

2010 ◽  
Vol 48 ◽  
pp. 25-43 ◽  
Author(s):  
Dean A. Jackson
Keyword(s):  
Nuclear Structure ◽  
Genetic Information ◽  
Nuclear Architecture ◽  
Cell Types ◽  
Structure And Function ◽  
Chromatin Dynamics ◽  
Functional Product ◽  
Higher Eukaryotes ◽  
And Function ◽  
Different Cell Types

Eukaryotic cells are defined by the genetic information that is stored in their DNA. To function, this genetic information must be decoded. In doing this, the information encoded in DNA is copied first into RNA, during RNA transcription. Primary RNA transcripts are generated within transcription factories, where they are also processed into mature mRNAs, which then pass to the cytoplasm. In the cytoplasm these mRNAs can finally be translated into protein in order to express the genetic information as a functional product. With only rare exceptions, the cells of an individual multicellular eukaryote contain identical genetic information. However, as different genes must be expressed in different cell types to define the structure and function of individual tissues, it is clear that mechanisms must have evolved to regulate gene expression. In higher eukaryotes, mechanisms that regulate the interaction of DNA with the sites where nuclear functions are performed provide one such layer of regulation. In this chapter, I evaluate how a detailed understanding of nuclear structure and chromatin dynamics are beginning to reveal how spatial mechanisms link chromatin structure and function. As these mechanisms operate to modulate the genetic information in DNA, the regulation of chromatin function by nuclear architecture defines the concept of ‘spatial epigenetics’.

Modeling of Artificial 3D Human Placenta

2021 ◽  
pp. 1-10
Author(s):  
Rumeysa Tutar ◽  
Betül Çelebi-Saltik
Keyword(s):  
Human Placenta ◽  
Placental Transfer ◽  
Complex Structure ◽  
Cell Types ◽  
Structure And Function ◽  
Technological Advances ◽  
And Function ◽  
Different Cell Types ◽  
Pregnancy And Birth

The placenta is the main organ that allows the fertilized oocyte to develop and mature. It allows the fetus to grow in the prenatal period by transferring oxygen and nutrients between the mother and the fetus. It acts as a basic endocrine organ which creates the physiological changes related to pregnancy and birth in the mother. Removal of wastes and carbon dioxide from the fetus is also achieved by the placenta. It prevents the rejection of the fetus and protects the fetus from harmful effects. Research on the human placenta focuses on understanding the placental structure and function to illuminate the complex structure of this important organ with technological advances. The structure and function of the placental barrier have been investigated with in vitro studies in 2D/3D, and various results have been published comparatively. In this review, we introduce the nature of the placenta with its 3D composition which has been called niche. Different cell types and placental structures are presented. We describe the systems and approaches used in the creation of current 3D placenta, placental transfer models as 3D placental barriers, and micro-engineered 3D placenta on-a-chip to explore complicated placental responses to nanoparticle exposure.

scholarly journals Tumors of the Central Nervous System: An Update

Cancers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2507
Author(s):  
Carla Mucignat-Caretta
Keyword(s):  
Central Nervous System ◽  
Nervous System ◽  
Brain Structure ◽  
Cell Types ◽  
Structure And Function ◽  
Brain Structure And Function ◽  
The Central Nervous System ◽  
And Function ◽  
Different Cell Types ◽  
The Brain

The brain may be affected by a variety of tumors of different grade, which originate from different cell types at distinct locations, thus impacting on the brain structure and function [...]

scholarly journals Structure and function of subcortical periodic cytoskeleton throughout the nervous system

STEMedicine ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. e9
Author(s):  
Cenfeng Chu ◽  
Guisheng Zhong ◽  
Hui Li
Keyword(s):  
Nervous System ◽  
Super Resolution ◽  
Cell Types ◽  
Structure And Function ◽  
Periodic Lattice ◽  
Cytoskeletal Organization ◽  
Molecular Specificity ◽  
And Function ◽  
Different Cell Types ◽  
Neural Diseases

Cytoskeleton plays an essential role in many functions in different cells and has been involved in the pathogenesis of many neural diseases. With the development of super-resolution fluorescence imaging technologies, which combine the molecular specificity and simple sample preparation of fluorescence microscopy and provide a spatial resolution comparable to that of electron microscopy, numerous new features have been revealed in the cytoskeletal organization of the subcortical cytoskeleton. A novel periodic lattice cytoskeleton is prevalent in different cell types throughout the nervous system. Here, we review the current studies of the molecular distribution, developmental mechanisms, and functional properties of the periodic cytoskeleton structure.

scholarly journals A simple electrical stimulation cell culture system on the myelination of dorsal root ganglia and Schwann cells

BioTechniques ◽  
2019 ◽  
Vol 67 (1) ◽  
pp. 11-15
Author(s):  
Zhuowen Liang ◽  
Tao Lei ◽  
Shuang Wang ◽  
ZhuoJing Luo ◽  
XueYu Hu
Keyword(s):  
Cell Culture ◽  
Electrical Stimulation ◽  
Schwann Cells ◽  
Dorsal Root Ganglia ◽  
Culture System ◽  
Dorsal Root ◽  
Cell Culture System

scholarly journals Melatonin Reduces Excitability in Dorsal Root Ganglia Neurons with Inflection on the Repolarization Phase of the Action Potential

2019 ◽  
Vol 20 (11) ◽  
pp. 2611 ◽  
Author(s):  
Klausen Oliveira-Abreu ◽  
Nathalia Silva-dos-Santos ◽  
Andrelina Coelho-de-Souza ◽  
Francisco Ferreira-da-Silva ◽  
Kerly Silva-Alves ◽  
...  
Keyword(s):  
Action Potential ◽  
Dorsal Root Ganglia ◽  
Dorsal Root ◽  
Neuronal Excitability ◽  
Input Resistance ◽  
Cell Types ◽  
Neuronal Population ◽  
Resting Membrane Potential ◽  
Electrophysiological Properties ◽  
Repolarization Phase

Melatonin is a neurohormone produced and secreted at night by pineal gland. Many effects of melatonin have already been described, for example: Activation of potassium channels in the suprachiasmatic nucleus and inhibition of excitability of a sub-population of neurons of the dorsal root ganglia (DRG). The DRG is described as a structure with several neuronal populations. One classification, based on the repolarizing phase of the action potential (AP), divides DRG neurons into two types: Without (N0) and with (Ninf) inflection on the repolarization phase of the action potential. We have previously demonstrated that melatonin inhibits excitability in N0 neurons, and in the present work, we aimed to investigate the melatonin effects on the other neurons (Ninf) of the DRG neuronal population. This investigation was done using sharp microelectrode technique in the current clamp mode. Melatonin (0.01–1000.0 nM) showed inhibitory activity on neuronal excitability, which can be observed by the blockade of the AP and by the increase in rheobase. However, we observed that, while some neurons were sensitive to melatonin effect on excitability (excitability melatonin sensitive—EMS), other neurons were not sensitive to melatonin effect on excitability (excitability melatonin not sensitive—EMNS). Concerning the passive electrophysiological properties of the neurons, melatonin caused a hyperpolarization of the resting membrane potential in both cell types. Regarding the input resistance (Rin), melatonin did not change this parameter in the EMS cells, but increased its values in the EMNS cells. Melatonin also altered several AP parameters in EMS cells, the most conspicuously changed was the (dV/dt)max of AP depolarization, which is in coherence with melatonin effects on excitability. Otherwise, in EMNS cells, melatonin (0.1–1000.0 nM) induced no alteration of (dV/dt)max of AP depolarization. Thus, taking these data together, and the data of previous publication on melatonin effect on N0 neurons shows that this substance has a greater pharmacological potency on Ninf neurons. We suggest that melatonin has important physiological function related to Ninf neurons and this is likely to bear a potential relevant therapeutic use, since Ninf neurons are related to nociception.

Induction of neuronal and myelin-related gene expression by IL-6-receptor/IL-6: A study on embryonic dorsal root ganglia cells and isolated Schwann cells

2007 ◽  
Vol 208 (2) ◽  
pp. 285-296 ◽  
Author(s):  
Pei-Lin Zhang ◽  
Alon M. Levy ◽  
Levana Ben-Simchon ◽  
Shalom Haggiag ◽  
Judith Chebath ◽  
...  
Keyword(s):  
Gene Expression ◽  
Schwann Cells ◽  
Dorsal Root Ganglia ◽  
Dorsal Root ◽  
Related Gene

scholarly journals A systems perspective of heterocellular signaling

2018 ◽  
Vol 62 (4) ◽  
pp. 607-617 ◽  
Author(s):  
Alan Wells ◽  
H. Steven Wiley
Keyword(s):  
Cell Types ◽  
Regulatory Processes ◽  
Technical Developments ◽  
Building Models ◽  
Realistic Description ◽  
Multiple Cell ◽  
Solid Foundation ◽  
And Function ◽  
Multicellular Organisms ◽  
Different Cell Types

Signal exchange between different cell types is essential for development and function of multicellular organisms, and its dysregulation is causal in many diseases. Unfortunately, most cell-signaling work has employed single cell types grown under conditions unrelated to their native context. Recent technical developments have started to provide the tools needed to follow signaling between multiple cell types, but gaps in the information they provide have limited their usefulness in building realistic models of heterocellular signaling. Currently, only targeted assays have the necessary sensitivity, selectivity, and spatial resolution to usefully probe heterocellular signaling processes, but these are best used to test specific, mechanistic models. Decades of systems biology research with monocultures has provided a solid foundation for building models of heterocellular signaling, but current models lack a realistic description of regulated proteolysis and the feedback processes triggered within and between cells. Identification and understanding of key regulatory processes in the extracellular environment and of recursive signaling patterns between cells will be essential to building predictive models of heterocellular systems.

scholarly journals Fabrication of growth factor- and extracellular matrix-loaded, gelatin-based scaffolds and their biocompatibility with Schwann cells and dorsal root ganglia

Biomaterials ◽  
2012 ◽  
Vol 33 (33) ◽  
pp. 8529-8539 ◽  
Author(s):  
Rodolfo E. Gámez Sazo ◽  
Katsumi Maenaka ◽  
Weiyong Gu ◽  
Patrick M. Wood ◽  
Mary Bartlett Bunge
Keyword(s):  
Extracellular Matrix ◽  
Growth Factor ◽  
Schwann Cells ◽  
Dorsal Root Ganglia ◽  
Dorsal Root
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