共查询到20条相似文献,搜索用时 9 毫秒
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Benjamin Förthmann Hella Brinkmann Andreas Ratzka Michal K. Stachowiak Claudia Grothe Peter Claus 《Cellular and molecular life sciences : CMLS》2013,70(14):2555-2568
Reduced levels of survival of motoneuron (SMN) protein lead to spinal muscular atrophy, but it is still unknown how SMN protects motoneurons in the spinal cord against degeneration. In the nucleus, SMN is associated with two types of nuclear bodies denoted as gems and Cajal bodies (CBs). The 23 kDa isoform of fibroblast growth factor-2 (FGF-223) is a nuclear protein that binds to SMN and destabilizes the SMN-Gemin2 complex. In the present study, we show that FGF-223 depletes SMN from CBs without affecting their general structure. FRAP analysis of SMN-EGFP in CBs demonstrated that the majority of SMN in CBs remained mobile and allowed quantification of fast, slow and immobile nuclear SMN populations. The potential for SMN release was confirmed by in vivo photoconversion of SMN-Dendra2, indicating that CBs concentrate immobile SMN that could have a specialized function in CBs. FGF-223 accelerated SMN release from CBs, accompanied by a conversion of immobile SMN into a mobile population. Furthermore, FGF-223 caused snRNP accumulation in CBs. We propose a model in which Cajal bodies store immobile SMN that can be mobilized by its nuclear interaction partner FGF-223, leading to U4 snRNP accumulation in CBs, indicating a role for immobile SMN in tri-snRNP assembly. 相似文献
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R. M. H. Ravindranath M. H. Ravindranath M. C. Graves 《Cellular and molecular life sciences : CMLS》1997,53(9):750-758
IgM antibodies directed against neuronal gangliosides GM1 , GM2 , GD1a , GD1b and GT1b occur in normal individuals and their level significantly decreases with age. Patients with lower motor neuron disease (LMND)
produce high levels of these autoantibodies. AntiGM1 IgM is selectively augmented. In these patients, the CD5+ (B1) and CD5− (B2) subsets of B cells are not distinct entities
but range from those without detectable CD5 marker to those with high CD5+ expression. B1 B cells were sorted to homogeneity,
but B2 B cell cannot be isolated to homogeneity because of the presence of B1 cells with low CD5 expression. In short term
cultures both the subsets produced IgM antibodies, but the antibodies reacted better with desialylated GM1 than with GM1 . Cycloheximide (Cx) (0.35 mM) largely blocked IgM synthesis of the B1 B cells but inhibition of the B2 B cells was incomplete,
possibly due to shedding of cytophilic antibodies as well as to the presence of B1 phenotype with loss of CD5 expression.
CD5+ B cells may be involved in the production of antiglycolipid IgM.
Received 9 June 1997; received after revision 21 July 1997; accepted 28 July 1997 相似文献
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Alireza Noormohammadi Giuseppe Calculli Ricardo Gutierrez-Garcia Amirabbas Khodakarami Seda Koyuncu David Vilchez 《Cellular and molecular life sciences : CMLS》2018,75(2):275-290
Protein homeostasis, or proteostasis, is essential for cell function, development, and organismal viability. The composition of the proteome is adjusted to the specific requirements of a particular cell type and status. Moreover, multiple metabolic and environmental conditions challenge the integrity of the proteome. To maintain the quality of the proteome, the proteostasis network monitors proteins from their synthesis through their degradation. Whereas somatic stem cells lose their ability to maintain proteostasis with age, immortal pluripotent stem cells exhibit a stringent proteostasis network associated with their biological function and intrinsic characteristics. Moreover, growing evidence indicates that enhanced proteostasis mechanisms play a central role in immortality and cell fate decisions of pluripotent stem cells. Here, we will review new insights into the melding fields of proteostasis and pluripotency and their implications for the understanding of organismal development and survival. 相似文献
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T. B. Gilliam R. R. Roy J. F. Taylor W. W. Heusner W. D. Van Huss 《Cellular and molecular life sciences : CMLS》1977,33(5):665-667
Summary The observed differences in the soma and nuclear diameters reflect chronic changes specific to each exercise regimen used.This study was supported by National Institute of Health Grant HD 03918, Michigan State University, East Lansing, Michigan.Acknowledgments. Gratitude is expressed to Barbara Wheaton for her technical assistance in the processing of tissues and R. E. Carrow for making his laboratory facilities available for this study. 相似文献
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Pamela S. Gallagher Michelle L. Oeser Ayelet-chen Abraham Daniel Kaganovich Richard G. Gardner 《Cellular and molecular life sciences : CMLS》2014,71(10):1865-1879
The accumulation and aggregation of misfolded proteins is the primary hallmark for more than 45 human degenerative diseases. These devastating disorders include Alzheimer’s, Parkinson’s, Huntington’s, and amyotrophic lateral sclerosis. Over 15 degenerative diseases are associated with the aggregation of misfolded proteins specifically in the nucleus of cells. However, how the cell safeguards the nucleus from misfolded proteins is not entirely clear. In this review, we discuss what is currently known about the cellular mechanisms that maintain protein homeostasis in the nucleus and protect the nucleus from misfolded protein accumulation and aggregation. In particular, we focus on the chaperones found to localize to the nucleus during stress, the ubiquitin–proteasome components enriched in the nucleus, the signaling systems that might be present in the nucleus to coordinate folding and degradation, and the sites of misfolded protein deposition associated with the nucleus. 相似文献
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Neurotrophins are a family of structurally and functionally related neurotrophic factors which, in mammals, include: nerve
growth factor, brain-derived neurotrophic factor, neurotrophin-3 (NT-3), and NT-4/5. In addition to their canonical role in
promoting neuronal survival, these molecules appear to regulate multiple aspects of the development of the nervous system
in vertebrates, including neuronal differentiation, axon elongation and target innervation, among others. Actions of neurotrophins
and of their receptors in vivo are being analyzed by loss-of-function or gain-of-function experiments in mice. Here, we review
the phenotypes of the primary sensory system in these mutant mouse strains and the different strategies specifically involved
in the regulation of neuronal survival by neurotrophins in this portion of the nervous system.
Received 10 December 2001; received after revision 11 May 2002; accepted 13 May 2002
RID="*"
ID="*"Corresponding author. 相似文献
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Lisowska E 《Cellular and molecular life sciences : CMLS》2002,59(3):445-455
Glycosylation of proteins is a common event and contributes to protein antigenic properties. Most data have been obtained
from model studies on glycoprotens with well-defined structure or synthetic glycopeptides and their respective monoclonal
antibodies. Antibodies raised against glycoprotein antigens may be specific for their carbohydrate units which are recognized
irrespective of the protein carrier (carbohydrate epitopes), or in the context of the adjacent amino acid residues (glycopeptidic
epitopes). Conformation or proper exposure of peptidic epitopes of glycoproteins is also frequently modulated by glycosylation
due to intramolecular carbohydrate-protein interactions. The effects of glycosylation are broad: glycosylation may 'inactivate'
the peptidic epitope or may be required for its reactivity with the antibody, depending on the structure of the antigenic
site and antibody fine specificity. Evidence is increasing that similar effects of glycosylation pertain to T cell-dependent
cellular immune responses. Glycosylated peptides can be bound and presented by MHC class I or II molecules and elicit glycopeptide-specific
T cell clones.
Received 5 July 2001; received after revision 9 October 2001; accepted 11 October 2001 相似文献
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V. Bocci A. Pacini G. P. Pessina V. Bargigli M. Russi 《Cellular and molecular life sciences : CMLS》1977,33(2):164-166
Summary Rabbit interferon has been extensively desialylated and its metabolic behaviour has been evaluated in the rabbit. The half-life of asialointerferon is significantly shorter than the native interferon and its urinary excretion becomes negligible. Moreover the rapid uptake of asialointerferon by the isolated and perfused rabbit liver, suggests a hitherto unsuspected catabolic pathway for this glycoprotein.This work was supported by a grant from the Consiglio Nazionale delle Ricerche, Roma (subproject on antiviral therapy), contract No. 76.00646.84). 相似文献
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Sterile inflammation is a cornerstone of immune activation in obesity and type 2 Diabetes Mellitus. The molecular underpinnings of this inflammation include nutrient excess-mediated activation of the innate immune NLRP3 inflammasome. At the same time, disruption of mitochondrial integrity is emerging as an integral control node in NLRP3 inflammasome activation and is also associated with caloric overload conditions including obesity and diabetes. Conversely, caloric restriction and fasting mimetic interventions alleviate these caloric excess-linked diseases and reduce inflammation and the NLRP3 inflammasome. The objective of this review is to integrate the findings linking mitochondrial integrity to the activation of the NLRP3 inflammasome and to evaluate how caloric restriction or caloric restriction mimetic compounds may play a role in attenuating the NLRP3 inflammasome and sterile inflammation. 相似文献
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Zusammenfassung Durch KMnO4-Injektionen hervorgerufene lokale Hautverkalkung kann durch Pyrophosphatinjektionen verhindert werden. Durch alkalische Phosphatase wird die Pyrophosphatwirkung aufgehoben. 相似文献
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M. Peters 《Cellular and molecular life sciences : CMLS》1976,32(2):264-266
Summary A method is described for axonal cobalt-staining of peripheral nerve branches. First experiments were carried out on abdominal muscles of the locust. 相似文献
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In Drosophila, four genes encode for laminin subunits and the formation of two laminin heterotrimers has been postulated. We report the
identification of mutations in the Drosophila LamininB2 (LanB2) gene that encodes for the only laminin γ subunit and is found in both heterotrimers. We describe their effects on embryogenesis,
in particular the differentiation of visceral tissues with respect to the ECM. Analysis of mesoderm endoderm interaction indicates
disrupted basement membranes and defective endoderm migration, which finally interferes with visceral myotube stretching.
Extracellular deposition of laminin is blocked due to the loss of the LanB2 subunit, resulting in an abnormal distribution
of ECM components. Our data, concerning the different function of both trimers during organogenesis, suggest that these trimers
might act in a cumulative way and probably at multiple steps during ECM assembly. We also observed genetic interactions with
kon-tiki and thrombospondin, indicating a role for laminin during muscle attachment. 相似文献
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S. Albert P. L. Wolf Rosamond Potter 《Cellular and molecular life sciences : CMLS》1966,22(7):477-478
Zusammenfassung Das Überleben der von der eigenen Mutter und von stammesfremden «Ammen» gesäugten Jungen wurde untersucht an Mäusen der Stämme AKR/Sp, PL/Sp und C57BL/Sp. Die Ergebnisse zeigen, dass die genetische Herkunft der Säuglinge wie auch andere, nicht genetisch bedingte Einflüsse der Mutter auf die Jungen in utero für das Überleben der Jungen ausschlaggebend ist.
This investigation was supported in part by Public Health Service Research Grants Nos. CA 02151, CA 02903 and CA 02624 from the National Cancer Institute, and in part by an institutional grant to the Detroit Institute of Cancer Research from the United Foundation of Greater Detroit allocated through the Michigan Cancer Foundation. 相似文献
This investigation was supported in part by Public Health Service Research Grants Nos. CA 02151, CA 02903 and CA 02624 from the National Cancer Institute, and in part by an institutional grant to the Detroit Institute of Cancer Research from the United Foundation of Greater Detroit allocated through the Michigan Cancer Foundation. 相似文献
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