Analysis of early phase [11C]BF-227 PET, and its application for anatomical standardization of late-phase images for 3D-SSP analysis

2014 ◽  
Vol 32 (3) ◽  
pp. 138-144 ◽  
Author(s):  
Tomohiro Kaneta ◽  
Nobuyuki Okamura ◽  
Akira Arai ◽  
Kentaro Takanami ◽  
Katsutoshi Furukawa ◽  
...  
Keyword(s):  
Early Phase ◽  
Late Phase ◽  
Anatomical Standardization ◽  
Phase Images

scholarly journals Contrast-Enhanced Endoscopic Ultrasonography for Pancreatic Tumors

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yasunobu Yamashita ◽  
Jun Kato ◽  
Kazuki Ueda ◽  
Yasushi Nakamura ◽  
Yuki Kawaji ◽  
...  
Keyword(s):  
Endoscopic Ultrasonography ◽  
Early Phase ◽  
Late Phase ◽  
Fibrous Tissue ◽  
Phase Correlation ◽  
Pancreatic Tumors ◽  
Phase Image ◽  
Histological Differentiation ◽  
Contrast Enhanced ◽  
Phase Images

Objectives. To investigate the usefulness of contrast-enhanced endoscopic ultrasonography (CE-EUS) for histological differentiation of pancreatic tumors.Methods. CE-EUS was performed for consecutive patients having a pancreatic solid lesion, and tumors were classified into three vascular patterns (hypervascular, isovascular, and hypovascular) at two time phases (early-phase and late-phase). Correlation between vascular patterns and histopathology of resected pancreatic cancer (PC) tissues was ascertained.Results. The final diagnoses of 147 examined tumors were PC(n=109), inflammatory mass(n=11), autoimmune pancreatitis(n=9), neuroendocrine tumor(n=8), and others(n=10). In late-phase images, 104 of 109 PCs had the hypovascular pattern, for a diagnostic sensitivity and specificity of 94% and 71%, respectively. Of 28 resected PCs, 10 had isovascular, and 18 hypovascular, patterns on the early-phase image. Early-phase isovascular PCs were more likely to be differentiated than were early-phase hypovascular PCs (6 well and 4 moderately differentiated versus 3 well, 14 moderately, and 1 poorly differentiated,P=0.028). Immunostaining revealed that hypovascular areas of early-phase images reflected heterogeneous tumor cells with fibrous tissue, necrosis, and few vessels.Conclusion. CE-EUS could be useful for distinguishing PC from other solid pancreatic lesions and for histological differentiation of PCs.

Improved Stage Categorization of PTZ-Induced Kindling and Late Enhanced Neurogenesis in PTZ Kindled Mice

2019 ◽  
Vol 8 ◽  
pp. 1511
Author(s):  
Marzieh Shahpari ◽  
Hadi Aligholi ◽  
Mohammad Reza Namavar ◽  
Farzaneh Vafaee ◽  
Masoumeh Emamghoreishi
Keyword(s):  
Subventricular Zone ◽  
Early Phase ◽  
Hind Limb ◽  
Late Phase ◽  
The Other ◽  
Myoclonic Jerk ◽  
Ptz Kindling ◽  
First Occurrence ◽  
Tonic Extension ◽  
Behavioral Index

Background: There is no universally accepted behavioral scoring to define the early development of phenothiazine (PTZ) kindling. Therefore, studies investigating alterations of neurogenesis in the PTZ model were mainly focused on full kindled animals rather than early stages of kindling. This study aimed to determine an appropriate behavioral index for categorizing stages of PTZ kindling progress and to evaluate neurogenesis during PTZ kindling. Materials and Methods: Twenty-four mice were intraperitoneally injected with a sub convulsive dose of PTZ (40mg/kg) every other day until they became full kindled. The first occurrence of different seizure behaviors and their durations were recorded during kindling development, and the different stages of kindling were categorized. Neurogenesis was evaluated in the lateral subventricular zone (SVZ) at each stage of kindling by immunofluorescence staining. Results: First occurrence of restlessness, motionless staring, hind limb tonic extension, Straub’s tail, myoclonic jerk, and tonic-clonic were sequentially observed in more than 80% of animals with increasing PTZ injections. The duration of the myoclonic jerk was significantly longer than the other seizure behaviors. The significantly higher percentage of BrdU-positive cells was found in SVZ of mice showing tonic-clonic in comparison to other seizure behaviors. Conclusion: A hierarchy behavior was observed during the kindling process when considering the first occurrence of seizure behaviors. We defined the first occurrence of restlessness, motionless, hind limb tonic extension and Straub’s tail behaviors as an early phase, myoclonic jerk as a borderline phase and tonic-clonic as a late phase of PTZ-induced kindling. Our results indicated an enhanced SVZ neurogenesis at the late phase of kindling. [GMJ.2019;8:e1511]

Nucleolin Improves Heart Function During Recovery From Myocardial Infarction by Modulating Macrophage Polarization

2021 ◽  
pp. 107424842198957
Author(s):  
Yuting Tang ◽  
Xiaofang Lin ◽  
Cheng Chen ◽  
Zhongyi Tong ◽  
Hui Sun ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Early Phase ◽  
Heart Function ◽  
Macrophage Polarization ◽  
Late Phase ◽  
Macrophage Infiltration ◽  
Enzyme Linked Immunosorbent Assay ◽  
M2 Macrophage ◽  
M2 Macrophage Polarization ◽  
Nucleolin Expression

Background: Nucleolin has multiple functions within cell survival and proliferation pathways. Our previous studies have revealed that nucleolin can significantly reduce myocardial ischemia-reperfusion injury by promoting myocardial angiogenesis and reducing myocardial apoptosis. In this study, we attempted to determine the role of nucleolin in myocardial infarction (MI) injury recovery and the underlying mechanism. Methods: Male BALB/c mice aged 6–8 weeks were used to set up MI models by ligating the left anterior descending coronary artery. Nucleolin expression in the heart was downregulated by intramyocardial injection of a lentiviral vector expressing nucleolin-specific small interfering RNA. Macrophage infiltration and polarization were measured by real-time polymerase chain reaction, flow cytometry, and immunofluorescence. Cytokines were detected by enzyme-linked immunosorbent assay. Results: Nucleolin expression in myocardium after MI induction decreased a lot at early phase and elevated at late phase. Nucleolin knockdown impaired heart systolic and diastolic functions and decreased the survival rate after MI. Macrophage infiltration increased in the myocardium after MI. Most macrophages belonged to the M1 phenotype at early phase (2 days) and the M2 phenotype increased greatly at late phase after MI. Nucleolin knockdown in the myocardium led to a decrease in M2 macrophage polarization with no effect on macrophage infiltration after MI. Furthermore, Notch3 and STAT6, key regulators of M2 macrophage polarization, were upregulated by nucleolin in RAW 264.7 macrophages. Conclusions: Lack of nucleolin impaired heart function during recovery after MI by reducing M2 macrophage polarization. This finding probably points to a new therapeutic option for ischemic heart disease.

scholarly journals AFP and eGFR are related to early and late recurrence of HCC following antiviral therapy

BMC Cancer ◽  
2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Takao Watanabe ◽  
Yoshio Tokumoto ◽  
Kouji Joko ◽  
Kojiro Michitaka ◽  
Norio Horiike ◽  
...  
Keyword(s):  
Risk Factors ◽  
Confidence Interval ◽  
Early Phase ◽  
Late Phase ◽  
Previous History ◽  
Late Recurrence ◽  
Early Recurrence ◽  
Hazard Ratio ◽  
Post Treatment ◽  
Hcc Recurrence

Abstract Background An unexpected recurrence of hepatocellular carcinoma (HCC) sometimes occurs in patients with hepatitis C virus (HCV) after treatment with direct-acting antivirals (DAAs). However, the characteristics of patients with HCC recurrence may differ depending on time after DAA treatment. We aimed to identify risk factors related to HCC recurrence according to time after DAA treatment. Methods Of 1663 patients with HCV treated with a DAA, 199 patients had a previous history of HCC. We defined HCC recurrence within 1 year after DAA treatment as ‘early recurrence’, and recurrence more than 1 year after as ‘late recurrence’. The different risk factors between the early and late phases of HCC recurrence after the end of DAA therapy were investigated. Results Ninety-seven patients experienced HCC recurrence during the study period. Incidences of recurrence were 29.8, 41.0, and 53.4% at 1, 2, and 3 years, respectively, after the end of DAA therapy. Multivariate analysis identified post-treatment α-fetoprotein (AFP) as an independent factor contributing to HCC recurrence in the early phase (hazard ratio, 1.056; 95% confidence interval, 1.026–1.087, p < 0.001) and post-treatment estimated glomerular filtration rate (eGFR) (hazard ratio, 0.98; 95% confidence interval, 0.96–0.99, p = 0.032) as a predictor of HCC recurrence in the late phase. Conclusion Patients with higher post-treatment AFP in the early phase and those with lower post-treatment eGFR in the late phase had a high risk of HCC recurrence. The risk factors associated with HCC recurrence after DAA treatment were different between the early and late phases.

Alternative poly(A) site utilization during adenovirus infection coincides with a decrease in the activity of a poly(A) site processing factor

1993 ◽  
Vol 13 (4) ◽  
pp. 2411-2419
Author(s):  
K P Mann ◽  
E A Weiss ◽  
J R Nevins
Keyword(s):  
Early Phase ◽  
Late Phase ◽  
Transcription Unit ◽  
Adenovirus Infection ◽  
Processing Factor ◽  
Proximal Half ◽  
Rate Determining Step ◽  
Frequency Of Use ◽  
Late Transcription ◽  
A Site

The recognition and processing of a pre-mRNA to create a poly(A) addition site, a necessary step in mRNA biogenesis, can also be a regulatory event in instances in which the frequency of use of a poly(A) site varies. One such case is found during the course of an adenovirus infection. Five poly(A) sites are utilized within the major late transcription unit to produce more than 20 distinct mRNAs during the late phase of infection. The proximal half of the major late transcription unit is also expressed during the early phase of a viral infection. During this early phase of expression, the L1 poly(A) site is used three times more frequently than the L3 poly(A) site. In contrast, the L3 site is used three times more frequently than the L1 site during the late phase of infection. Recent experiments have suggested that the recognition of the poly(A) site GU-rich downstream element by the CF1 processing factor may be a rate-determining step in poly(A) site selection. We demonstrate that the interaction of CF1 with the L1 poly(A) site is less stable than the interaction of CF1 with the L3 poly(A) site. We also find that there is a substantial decrease in the level of CF1 activity when an adenovirus infection proceeds to the late phase. We suggest that this reduction in CF1 activity, coupled with the relative instability of the interaction with the L1 poly(A) site, contributes to the reduced use of the L1 poly(A) site during the late stage of an adenovirus infection.

Control of adenovirus E1B mRNA synthesis by a shift in the activities of RNA splice sites

1984 ◽  
Vol 4 (5) ◽  
pp. 966-972
Author(s):  
C Montell ◽  
E F Fisher ◽  
M H Caruthers ◽  
A J Berk
Keyword(s):  
Splice Site ◽  
Rna Splicing ◽  
Early Phase ◽  
Late Phase ◽  
Productive Infection ◽  
Splice Sites ◽  
Mrna Synthesis ◽  
Adenovirus E1b ◽  
Cryptic Splice Sites ◽  
Rna Splice Sites

The primary transcript from adenovirus 2 early region 1B (E1B) is processed by differential RNA splicing into two overlapping mRNAs, 13S and 22S. The 22S mRNA is the major E1B mRNA during the early phase of infection, whereas the 13S mRNA predominates during the late phase. In previous work, it has been shown that this shift in proportions of the E1B mRNAs is influenced by increased cytoplasmic stability of the 13S mRNA at late times in infection. Two observations presented here demonstrate that the increase in proportion of the 13S mRNA at late times is also regulated by a change in the specificity of RNA splicing. First, the relative concentrations of the 13S to 22S nuclear RNAs were not constant throughout infection but increased at late times. Secondly, studies with the mutant, adenovirus 2 pm2250 , provided evidence that there was an increased propensity to utilize a 5' splice in the region of the 13S 5' splice site at late times in infection. Adenovirus 2 pm2250 has a G----C transversion in the first base of E1B 13S mRNA intron preventing splicing of the 13S mRNA but not of the 22S mRNA. During the early phase of a pm2250 infection, the E1B primary transcripts were processed into the 22S mRNA only. However, during the late phase, when the 13S mRNA normally predominates, E1B primary transcripts were also processed by RNA splicing at two formerly unused or cryptic 5' splice sites. Both cryptic splice sites were located much closer to the disrupted 13S 5' splice site than to the 22S 5' splice site. Thus, the temporal increase in proportion of the 13S mRNA to the 22S mRNA is regulated by two processes, an increase in cytoplasmic stability of the 13S mRNA and an increased propensity to utilize the 13S 5' splice site during the late phase of infection. Adenovirus 2 pm2250 was not defective for productive infection of HeLa cells or for transformation of rat cells.

Effects of treadmill exercise to exhaustion on the insulin response to hyperglycemia in untrained men

1991 ◽  
Vol 70 (1) ◽  
pp. 246-250 ◽  
Author(s):  
J. P. Kirwan ◽  
R. E. Bourey ◽  
W. M. Kohrt ◽  
M. A. Staten ◽  
J. O. Holloszy
Keyword(s):  
Insulin Secretion ◽  
Early Phase ◽  
Pancreatic Beta Cell ◽  
Late Phase ◽  
Insulin Response ◽  
Creatine Kinase Activity ◽  
Whole Body ◽  
Glucose Disposal ◽  
C Peptide ◽  
Hyperglycemic Clamp

The effects of a single bout of exercise to exhaustion on pancreatic insulin secretion were determined in seven untrained men by use of a 3-h hyperglycemic clamp with plasma glucose maintained at 180 mg/100 ml. Clamps were performed either 12 h after an intermittent treadmill run at approximately 77% maximum O2 consumption or without prior exercise. Arterialized blood samples for glucose, insulin, and C-peptide determination were obtained from a heated hand vein. The peak insulin response during the early phase (0–10 min) of the postexercise clamp was higher (81 +/- 8 vs. 59 +/- 9 microU/ml; P less than 0.05) than in the nonexercise clamp. Incremental areas under the insulin (376 +/- 33 vs. 245 +/- 51 microU.ml-1.min) and C-peptide (17 +/- 2 vs. 12 +/- 1 ng.ml-1.min) curves were also greater (P less than 0.05) during the early phase of the postexercise clamp. No differences were observed in either insulin concentrations or whole body glucose disposal during the late phase (15–180 min). Area under the C-peptide curve was greater during the late phase of the postexercise clamp (650 +/- 53 vs. 536 +/- 76 ng.ml-1.min, P less than 0.05). The exercise bout induced muscle soreness and caused an elevation in plasma creatine kinase activity (142 +/- 32 vs. 305 +/- 31 IU/l; P less than 0.05) before the postexercise clamp. We conclude that in untrained men a bout of running to exhaustion increased pancreatic beta-cell insulin secretion during the early phase of the hyperglycemic clamp. Increased insulin secretion during the late phase of the clamp appeared to be compensated by increased insulin clearance.

scholarly journals Crotoxin-Induced Mice Lung Impairment: Role of Nicotinic Acetylcholine Receptors and COX-Derived Prostanoids

Biomolecules ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 794
Author(s):  
Marco Aurelio Sartim ◽  
Camila O. S. Souza ◽  
Cassiano Ricardo A. F. Diniz ◽  
Vanessa M. B. da Fonseca ◽  
Lucas O. Sousa ◽  
...  
Keyword(s):  
Respiratory Failure ◽  
Early Phase ◽  
Late Phase ◽  
Lung Mechanics ◽  
Respiratory Compromise ◽  
Nicotinic Acetylcholine ◽  
Crotalus Durissus Terrificus ◽  
Crotalus Durissus ◽  
The Impact ◽  
Lung Impairment

Respiratory compromise in Crotalus durissus terrificus (C.d.t.) snakebite is an important pathological condition. Considering that crotoxin (CTX), a phospholipase A2 from C.d.t. venom, is the main component of the venom, the present work investigated the toxin effects on respiratory failure. Lung mechanics, morphology and soluble markers were evaluated from Swiss male mice, and mechanism determined using drugs/inhibitors of eicosanoids biosynthesis pathway and autonomic nervous system. Acute respiratory failure was observed, with an early phase (within 2 h) characterized by enhanced presence of eicosanoids, including prostaglandin E2, that accounted for the increased vascular permeability in the lung. The alterations of early phase were inhibited by indomethacin. The late phase (peaked 12 h) was marked by neutrophil infiltration, presence of pro-inflammatory cytokines/chemokines, and morphological alterations characterized by alveolar septal thickening and bronchoconstriction. In addition, lung mechanical function was impaired, with decreased lung compliance and inspiratory capacity. Hexamethonium, a nicotinic acetylcholine receptor antagonist, hampered late phase damages indicating that CTX-induced lung impairment could be associated with cholinergic transmission. The findings reported herein highlight the impact of CTX on respiratory compromise, and introduce the use of nicotinic blockers and prostanoids biosynthesis inhibitors as possible symptomatic therapy to Crotalus durissus terrificus snakebite.

Evolution of a Jet-like Structure in the Late Phase of a Complex Solar Outburst

1971 ◽  
Vol 2 (1) ◽  
pp. 62-65 ◽  
Author(s):  
A. C. Riddle ◽  
K. V. Sheridan
Keyword(s):  
Early Phase ◽  
Late Phase ◽  
Source Model ◽  
Moving Sources ◽  
Close Juxtaposition ◽  
New Feature

A new feature in the form of a jet formed by close juxtaposition of a number of highly polarized, separately resolved 80 MHz sources was observed as the late phase of a very complex outburst on 1971 January 25. We present here a source model which, we think, can explain the observed source properties. The early phase, also complex and involving numerous moving sources, will be described first.

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