To establish a three-dimentional liver function evaluation system using 99mTc-diethyl iminodiacetic acid (99mTc-EHIDA) scintigraphy based on single photon emission computed tomography (SPECT).
...Totally 16 patients with liver lesions were divided into cirrhosis group and non-cirrhosis group. SPECT was performed 2 days before operation and 5 days after operation. Serum liver functions were examined on the same day of scintigraphy. SPECT images of areas of interest of heart and liver were aquired. Time of the peak of EHIDA density in liver (Tpeak), five-minutes heart liver index (HLI5), blood clearance index (HH15), receptor index (LHL15), and the predictive values were calculated.
Tpeak was not significantly different between two groups, while HLI5, HH15, and LHL15 were significantly different (P = 0.033, P = 0.001, and P = 0.005). HLI, and LHL15 were significantly correlated with preoperative total protein and prealbumin levels (P = 0.003, P = 0.015, P = 0.022, P = 0.038) and post-operative prealbumin (P = 0.03
Previous studies have indicated that inflammatory stimulation represses protein phosphatase 2A (PP2A), a well-known tumor suppressor. However, whether PP2A repression participates in pancreatic ...cancer progression has not been verified. We used lipopolysaccharide (LPS) and macrophage-conditioned medium (MCM) to establish in vitro inflammation models, and investigated whether inflammatory stimuli affect pancreatic cancer cell growth and invasion PP2A catalytic subunit (PP2Ac)-dependently. Via nude mouse models of orthotopic tumor xenografts and dibutyltin dichloride (DBTC)-induced chronic pancreatitis, we evaluated the effect of an inflammatory microenvironment on PP2Ac expression in vivo. We cloned the PP2Acα and PP2Acβ isoform promoters to investigate the PP2Ac transcriptional regulation mechanisms. MCM accelerated pancreatic cancer cell growth; MCM and LPS promoted cell invasion. DBTC promoted xenograft growth and metastasis, induced tumor-associated macrophage infiltration, promoted angiogenesis, activated the nuclear factor-κB (NF-κB) pathway, and repressed PP2Ac expression. In vitro, LPS and MCM downregulated PP2Ac mRNA and protein. PP2Acα overexpression attenuated JNK, ERK, PKC, and IKK phosphorylation, and impaired LPS/MCM-stimulated cell invasion and MCM-promoted cell growth. LPS and MCM activated the NF-κB pathway in vitro. LPS and MCM induced IKK and IκB phosphorylation, leading to p65/RelA nuclear translocation and transcriptional activation. Overexpression of the dominant negative forms of IKKα attenuated LPS and MCM downregulation of PP2Ac, suggesting inflammatory stimuli repress PP2Ac expression NF-κB pathway-dependently. Luciferase reporter gene assay verified that LPS and MCM downregulated PP2Ac transcription through an NF-κB-dependent pathway. Our study presents a new mechanism in inflammation-driven cancer progression through NF-κB pathway-dependent PP2Ac repression.
A comprehensive test stand for high-intensity cyclotron development, a 10 MeV 430 μA cyclotron, has been successfully constructed at China Institute of Atomic Energy (CIAE) for the experimental ...verification of the viability of a 100 MeV high-intensity cyclotron (CYCIAE-100) being constructed at CIAE. The verification includes the overall design technology, detail design and engineering technology for the crucial parts of the machine, e.g. main magnet and beam diagnostics. It will also pave the way for future enhancement of the beam intensity. The test stand consists of a H− ion source, axial injection system, central region, main magnet and coil, RF resonator, stripping extraction, and auxiliary systems, which include the RF power amplifier, high voltage and DC power supplies, electric apparatus, beam diagnostics, control, vacuum, water cooling, pneumatic system, and safety interlock. This paper presents the work regarding the design and sub-system development of the test sand, and the results of the beam commissioning of the machine.
Patients with obstructive jaundice have a high susceptibility to infection in the process of treatment and the reason for this is not fully understood. It was postulated that it may bear some ...relations to abnormalities of immune function. In this article, 28 cases of obstructive jaundice were selected to investigate alternation of monocyte immune function with the purpose of exploring mechanism of high susceptibility to infection from the perspective of immunology. The results showed that interleukin 1 production by monocytes significantly decreased and prostaglandin E2 increased, HLA-DR expression of monocytes was remarkably depressed. HLA-DR expression of monocytes was further decreased with recovery slower than non-jaundiced patients after operation. All this may be responsible for high susceptibility to infection in the process of treatment of obstructive jaundice.
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