scholarly journals The Presynaptic Scaffold Protein Bassoon in Forebrain Excitatory Neurons Mediates Hippocampal Circuit Maturation: Potential Involvement of TrkB Signalling

2021 ◽  
Vol 22 (15) ◽  
pp. 7944
Author(s):  
Anil Annamneedi ◽  
Miguel del Angel ◽  
Eckart D. Gundelfinger ◽  
Oliver Stork ◽  
Gürsel Çalışkan
Keyword(s):  
Active Zone ◽  
Perforant Path ◽  
Postnatal Maturation ◽  
Protein Levels ◽  
Adult Mice ◽  
Developmental Disturbances ◽  
High Affinity Receptor ◽  
Presynaptic Active Zone ◽  
Tropomyosin Related Kinase B ◽  
Old Mice

A presynaptic active zone organizer protein Bassoon orchestrates numerous important functions at the presynaptic active zone. We previously showed that the absence of Bassoon exclusively in forebrain glutamatergic presynapses (BsnEmx1cKO) in mice leads to developmental disturbances in dentate gyrus (DG) affecting synaptic excitability, morphology, neurogenesis and related behaviour during adulthood. Here, we demonstrate that hyperexcitability of the medial perforant path-to-DG (MPP-DG) pathway in BsnEmx1cKO mice emerges during adolescence and is sustained during adulthood. We further provide evidence for a potential involvement of tropomyosin-related kinase B (TrkB), the high-affinity receptor for brain-derived neurotrophic factor (BDNF), mediated signalling. We detect elevated TrkB protein levels in the dorsal DG of adult mice (~3–5 months-old) but not in adolescent (~4–5 weeks-old) mice. Electrophysiological analysis reveals increased field-excitatory-postsynaptic-potentials (fEPSPs) in the DG of the adult, but not in adolescent BsnEmx1cKO mice. In line with an increased TrkB expression during adulthood in BsnEmx1cKO, blockade of TrkB normalizes the increased synaptic excitability in the DG during adulthood, while no such effect was observed in adolescence. Accordingly, neurogenesis, which has previously been found to be increased in adult BsnEmx1cKO mice, was unaffected at adolescent age. Our results suggest that Bassoon plays a crucial role in the TrkB-dependent postnatal maturation of the hippocampus.

Amyloid Precursor Protein Knockout Diminishes Synaptic Vesicle Proteins at the Presynaptic Active Zone in Mouse Brain

2014 ◽  
Vol 11 (10) ◽  
pp. 971-980 ◽  
Author(s):  
Melanie Laßek ◽  
Jens Weingarten ◽  
Amparo Acker-Palmer ◽  
Sandra Bajjalieh ◽  
Ulrike Muller ◽  
...  
Keyword(s):  
Amyloid Precursor Protein ◽  
Synaptic Vesicle ◽  
Mouse Brain ◽  
Active Zone ◽  
Precursor Protein ◽  
Presynaptic Active Zone ◽  
Vesicle Proteins

scholarly journals Physical exercise increases Sestrin 2 protein levels and induces autophagy in the skeletal muscle of old mice

2017 ◽  
Vol 97 ◽  
pp. 17-21 ◽  
Author(s):  
Luciene Lenhare ◽  
Barbara M. Crisol ◽  
Vagner R.R. Silva ◽  
Carlos K. Katashima ◽  
André V. Cordeiro ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Physical Exercise ◽  
Protein Levels ◽  
Old Mice

scholarly journals Synaptophysin 1 Clears Synaptobrevin 2 from the Presynaptic Active Zone to Prevent Short-Term Depression

Cell Reports ◽  
2016 ◽  
Vol 14 (6) ◽  
pp. 1369-1381 ◽  
Author(s):  
Rajit Rajappa ◽  
Anne Gauthier-Kemper ◽  
Daniel Böning ◽  
Jana Hüve ◽  
Jürgen Klingauf
Keyword(s):  
Active Zone ◽  
Short Term ◽  
Presynaptic Active Zone

scholarly journals A Long-Term Enriched Environment Ameliorates the Accelerated Age-Related Memory Impairment Induced by Gestational Administration of Lipopolysaccharide: Role of Plastic Mitochondrial Quality Control

2021 ◽  
Vol 14 ◽  
Author(s):  
Zhan-Qiang Zhuang ◽  
Zhe-Zhe Zhang ◽  
Yue-Ming Zhang ◽  
He-Hua Ge ◽  
Shi-Yu Sun ◽  
...  
Keyword(s):  
Learning And Memory ◽  
Spatial Learning ◽  
Memory Impairment ◽  
Spatial Learning And Memory ◽  
Mitochondrial Quality Control ◽  
Protein Levels ◽  
Age Related ◽  
Old Mice ◽  
Lps Treatment

Studies have shown that gestational inflammation accelerates age-related memory impairment in mother mice. An enriched environment (EE) can improve age-related memory impairment, whereas mitochondrial dysfunction has been implicated in the pathogenesis of brain aging. However, it is unclear whether an EE can counteract the accelerated age-related memory impairment induced by gestational inflammation and whether this process is associated with the disruption of mitochondrial quality control (MQC) processes. In this study, CD-1 mice received daily intraperitoneal injections of lipopolysaccharide (LPS, 50 μg/kg) or normal saline (CON group) during gestational days 15–17 and were separated from their offspring at the end of normal lactation. The mothers that received LPS were divided into LPS group and LPS plus EE (LPS-E) treatment groups based on whether the mice were exposed to an EE until the end of the experiment. At 6 and 18 months of age, the Morris water maze test was used to evaluate spatial learning and memory abilities. Quantitative reverse transcription polymerase chain reaction and Western blot were used to measure the messenber RNA (mRNA) and protein levels of MQC-related genes in the hippocampus, respectively. The results showed that all the aged (18 months old) mice underwent a striking decline in spatial learning and memory performances and decreased mRNA/protein levels related to mitochondrial dynamics (Mfn1/Mfn2, OPA1, and Drp1), biogenesis (PGC-1α), and mitophagy (PINK1/parkin) in the hippocampi compared with the young (6 months old) mice. LPS treatment exacerbated the decline in age-related spatial learning and memory and enhanced the reduction in the mRNA and protein levels of MQC-related genes but increased the levels of PGC-1α in young mice. Exposure to an EE could alleviate the accelerated decline in age-related spatial learning and memory abilities and the accelerated changes in MQC-related mRNA or protein levels resulting from LPS treatment, especially in aged mice. In conclusion, long-term exposure to an EE can counteract the accelerated age-related spatial cognition impairment modulated by MQC in CD-1 mother mice that experience inflammation during pregnancy.

scholarly journals Assembling the Presynaptic Active Zone

Neuron ◽  
2001 ◽  
Vol 29 (1) ◽  
pp. 131-143 ◽  
Author(s):  
Rong Grace Zhai ◽  
Hagit Vardinon-Friedman ◽  
Claudia Cases-Langhoff ◽  
Birgit Becker ◽  
Eckart D. Gundelfinger ◽  
...  
Keyword(s):  
Active Zone ◽  
Presynaptic Active Zone

scholarly journals Aging Influences the Metabolic and Inflammatory Phenotype in an Experimental Mouse Model of Acute Lung Injury

2020 ◽  
Author(s):  
Kevin W Gibbs ◽  
Chia-Chi Chuang Key ◽  
Lanazha Belfield ◽  
Jennifer Krall ◽  
Lina Purcell ◽  
...  
Keyword(s):  
Acute Lung Injury ◽  
Fatty Acid ◽  
Lung Injury ◽  
Whole Body ◽  
Acid Oxidation ◽  
Aged Mice ◽  
Protein Levels ◽  
Adult Mice ◽  
Age Related ◽  
Before And After

Abstract Increased age is a risk factor for poor outcomes from respiratory failure and acute respiratory distress syndrome (ARDS). In this study, we sought to define age-related differences in lung inflammation, muscle injury, and metabolism after intratracheal lipopolysaccharide (IT-LPS) acute lung injury (ALI) in adult (6 months) and aged (18–20 months) male C57BL/6 mice. We also investigated age-related changes in muscle fatty acid oxidation (FAO) and the consequences of systemic FAO inhibition with the drug etomoxir. Aged mice had a distinct lung injury course characterized by prolonged alveolar neutrophilia and lack of response to therapeutic exercise. To assess the metabolic consequences of ALI, aged and adult mice underwent whole body metabolic phenotyping before and after IT-LPS. Aged mice had prolonged anorexia and decreased respiratory exchange ratio, indicating increased reliance on FAO. Etomoxir increased mortality in aged but not adult ALI mice, confirming the importance of FAO on survival from acute severe stress and suggesting that adult mice have increased resilience to FAO inhibition. Skeletal muscles from aged ALI mice had increased transcription of key fatty acid metabolizing enzymes, CPT-1b, LCAD, MCAD, FATP1 and UCP3. Additionally, aged mice had increased protein levels of CPT-1b at baseline and after lung injury. Surprisingly, CPT-1b in isolated skeletal muscle mitochondria had decreased activity in aged mice compared to adults. The distinct phenotype of aged ALI mice has similar characteristics to the adverse age-related outcomes of ARDS. This model may be useful to examine and augment immunologic and metabolic abnormalities unique to the critically ill aged population.

scholarly journals Assembly of the presynaptic active zone

2020 ◽  
Vol 63 ◽  
pp. 95-103 ◽  
Author(s):  
Javier Emperador-Melero ◽  
Pascal S Kaeser
Keyword(s):  
Active Zone ◽  
Presynaptic Active Zone

scholarly journals AGE AND SUSCEPTIBILITY OF MICE TO COXSACKIE A VIRUSES

1962 ◽  
Vol 115 (4) ◽  
pp. 745-762 ◽  
Author(s):  
A. Martin Lerner ◽  
Howard S. Levin ◽  
Maxwell Finland
Keyword(s):  
Antibody Formation ◽  
Adult Mouse ◽  
Striated Muscle ◽  
Neutralizing Antibody ◽  
Subclinical Infection ◽  
Pathological Changes ◽  
Adult Mice ◽  
Hind Limbs ◽  
High Yields ◽  
Old Mice

Mice varying in age from 1 day to 8 months were inoculated intraperitoneally with Coxsackie A virus, type 9 and studies were made of the quantity of virus in striated muscle and myocardium, the presence of neutralizing antibody in the serum, and the pathological changes in the tissues. The hind limbs of young (1- to 20-day-old) mice yielded high titers of virus and showed diffuse myositis, whereas only low yields of virus and focal myositis were obtained in older mice. In the 20-day-old mice the skeletal lesions were not accompanied by manifest symptoms and histologically showed evidence of regeneration progressing from the 3rd to the 11th day after inoculation. Older mice showed no symptoms and only focal myositis and low yields of virus were found in their hind limbs. Coxsackie A9 virus replicated to relatively low titers in the hearts of young (1- to 40-day-old) mice without producing any demonstrable lesions whereas frank myocarditis with high yields of virus were demonstrated in mice infected at 8 months of age. The data suggest that at least for the 2 strains used, the adult mouse should be considered susceptible to subclinical infection with Coxsackie A9 virus. Neither subclinical infection, nor antibody formation was demonstrable in young adult mice inoculated with a strain of Coxsackie A4 virus.

scholarly journals Moderate Calcium Channel Dysfunction in Adult Mice with Inducible Cardiomyocyte-specific Excision of the cacnb2 Gene

2011 ◽  
Vol 286 (18) ◽  
pp. 15875-15882 ◽  
Author(s):  
Marcel Meissner ◽  
Petra Weissgerber ◽  
Juan E. Camacho Londoño ◽  
Jean Prenen ◽  
Sabine Link ◽  
...  
Keyword(s):  
Cardiac Myocytes ◽  
Cardiac Myocyte ◽  
Heart Function ◽  
Cardiac Fibroblasts ◽  
Calcium Currents ◽  
Protein Fractions ◽  
Protein Levels ◽  
Adult Mice ◽  
Embryonic Cardiomyocytes ◽  
The Difference

The major L-type voltage-gated calcium channels in heart consist of an α1C (CaV1.2) subunit usually associated with an auxiliary β subunit (CaVβ2). In embryonic cardiomyocytes, both the complete and the cardiac myocyte-specific null mutant of CaVβ2 resulted in reduction of L-type calcium currents by up to 75%, compromising heart function and causing defective remodeling of intra- and extra-embryonic blood vessels followed by embryonic death. Here we conditionally excised the CaVβ2 gene (cacnb2) specifically in cardiac myocytes of adult mice (KO). Upon gene deletion, CaVβ2 protein expression declined by >96% in isolated cardiac myocytes and by >74% in protein fractions from heart. These latter protein fractions include CaVβ2 proteins expressed in cardiac fibroblasts. Surprisingly, mice did not show any obvious impairment, although cacnb2 excision was not compensated by expression of other CaVβ proteins or changes of CaV1.2 protein levels. Calcium currents were still dihydropyridine-sensitive, but current density at 0 mV was reduced by <29%. The voltage for half-maximal activation was slightly shifted to more depolarized potentials in KO cardiomyocytes when compared with control cells, but the difference was not significant. In summary, CaVβ2 appears to be a much stronger modulator of L-type calcium currents in embryonic than in adult cardiomyocytes. Although essential for embryonic survival, CaVβ2 down-regulation in cardiomyocytes is well tolerated by the adult mice.

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