Objective To evaluate the accuracy and reliability of cone-beam computed tomography (CBCT) in the diagnosis of periodontal bone defects in the elderly.Methods The 38 teeth of 27 cases were collected and scanned both with CBCT technology and periapical radiography (PA).Periodontal bony defects were identified and linear measurements were made for all defects.All cases were treated with periodontal flap surgery with the bony defects and their linear measurements detected during operation as the gold standard.Results All periodontal bony defects were identified with CBCT with its accuracy rate of 100.0％ (72/72),but the buccal and lingual defects could not be measured by PA with its accuracy rate of 62.5％ (45/72).Linear measurements for all defects revealed no statistical differences between CBCT and direct measurement [(5.516 ± 0.393) mm vs.(5.385± 0.415) mm,t=1.948,P＞0.05],but there was a significant difference in linear measurement between PA and direct measurement [(6.311±0.439) mm vs.(5.411±0.418) mm,t=9.956,P＜0.05].Conclusions CBCT can offer the diagnostic information for periodontal bone defect from three dimensional direction in the elderly,provide objective and accurate assessment of alveolar bone resorption,and has higher accuracy and reliability.

Nissl stain and immunocytochemical methods were used to observe the structure of the subnuclei of interpeduncular nucleus in human neonatal brain and their localization of substance P-, leu enkephalin-, and serotonin (5-HT)-like immunoreactive elements. It was detected that the human neonatal interpeduncular nucleus could be divided into five subnuclei, including: the dorsal, dorsolateral, lateral, central, and intermediate subnuclei. The immunocytochemical results showed that the substance P-containing cell bodies and fibers or terminals were distributed chiefly in the dorsolateral, lateral subnuclei and the ventral part of the intermediate subnucleus; the enkephalin-containing cell bodies and fibers or terminals were concentrated in the central subnucleus; and meanwhile the serotonin-containing cell bodies and fibers or terminals were found mainly in the dorsal subnucleus.

Using immunohistochemical technique, the distribution and development of substance P (SP)-, L-enkephalin (L-Enk)- and serotonin (5-HT)-like immunoreactivity in Gudden's dorsal tegmental nucleus (GDTN) of human foetus (fetal age 11.5 to 35 weeks)and neonate (two days) were demonstrated. Gudden's dorsal tegmental nucleus in the human might be divided into pars centralis and pars peripheralis; and the time of initial appearance for SP-, L-Enk- and 5-HT-like immunoreactivity in GDTN was different. SP-like immunoreactive fibers and terminals appeared first and were distributed mainly in the pars centralis and their density was very high. L-Enk-like imunoreactive cells, fibers and terminals were distributed in the pars peripheralis. 5-HT-like immunoreactive cells, fibers and terminals were distributed in the medial part of the GDTN; As the foetus developed further, SP-, L-Enk- and 5-HT-like immunoreactivity in the GDTN showed their own special ontogenetic changes respectively

Objective To investigate the protective effects of isopimaric acid ( ISO), the BKCa channel activator, on cognitive function and synaptic plasticity in APP/PS1 mice. Methods Alzet osmotic pump was loaded with ISO or DMSO only and assembled with ALZET Brain Infusion Kit III. The cannula was implanted into the lateral ventricle of 4-month-old male APP/PS1 mice or matched wild type ( WT) mice. Two weeks later, open field test and Morris water maze were conducted. Paired-pulse facilitation ( PPF) and TBS-induced long-term potentiation ( LTP ) were recorded in CA1 region of hippocampus. Results The open field test showed that there was no significant difference among the four groups in spontaneous activities and vertical plane movement distance within 30 minutes. Floor plane movement distance was significantly greater in APP/PS1+DMSO group than that in WT+DMSO group(P<0.05) . Compared with the WT+DMSO group, APP/PS1+DMSO group had significantly longer escape latency from the third to fifth day and lower percentage of time spent in the target quadrant ((43.27±3.24)% vs (34.19±2.56)%) and the number of crossing through the platform ((4.25±0.66)times vs (1.93±0.33)times)(P<0.05). Compared with the APP/PS1+DMSO group, the APP/PS1+ISO group had significantly shorter escape latency from the fourth to fifth day and higher percentage of time spent in the target quadrant ((46.16±3.51)%) and the number of crossing through the platform ((3.41±0.34) times) (P<0.05). PPF in APP/PS1+DMSO group significantly reduced compared with that in WT+DMSO group at 30-50ms interstimulus interval(P<0.05). PPF in APP/PS1+ISO group((224.50±13.79)%) was significantly augment compared with APP/PS1+DMSO ((174.99 ±6.68)%) group at 40 ms interstimulus interval (P<0.05). The LTP at 60 min post-TBS was significantly smaller in the APP/PS1+DMSO group ((135.19±1.32)%) than that in the WT+DMSO group ((172.17± 4.15)%)(P<0.001). The LTP of the APP/PS1+ISO group((160.48±1.19)%) became significantly in-creased compared with that in the APP/PS1+DMSO group(P<0.001).Conclusion BKCa channel activator ISO improve the learning and memory function of APP/PS1 mice by promoting PPF and increasing LTP to recover synaptic plasticity in the hippocampus.

OBJECTIVETo establish a novel nude mice model which can be visualized in real time and detected in a continuous and dynamic way for the development and metastasis of adenoid cystic carcinoma.

METHODSHuman adenoid cystic carcinoma cells, ACCM cell line, were infected with retroviral vector of pLEGFP-N1 and then screened for a single colony of ACCM-GFP cells. Cell proliferation and morphological analysis were conducted for ACCM and ACCM-GFP cells. Nude mice lingual carcinoma model was set up with ACCM-GFP cells injection and real time observation with fluorescence imaging on ACCM-GFP tumors was performed subsequently. Histological assay was analyzed for ACCM and ACCM-GFP tumors as well.

RESULTSACCM-GFP cells were able to express GFP stably in the long term. ACCM and ACCM-GFP cells showed no significant difference in cell proliferation and morphology, and no significant difference of histological characteristics in vivo could be found between ACCM and ACCM-GFP tumors. Tumor development could be monitored in real time with fluorescence imaging system in vivo.

CONCLUSIONGFP-expressing ACCM tumor model can be applied to detect and observe its development in the long term in a noninvasive, real time and dynamic way. It is also a kind of ideal in vivo mouse model for adenoid cystic carcinoma research.

Animals ; Carcinoma, Adenoid Cystic ; Cell Line, Tumor ; Cell Proliferation ; Disease Models, Animal ; Green Fluorescent Proteins ; Humans ; Mice ; Mice, Inbred BALB C ; Mice, Nude

In recent years, the corona virus disease 2019 (COVID-19) pandemic has had a huge impact on the global medical, political and economic fields. Since the beginning of the COVID-19 epidemic, our understanding of the impact of COVID-19 has grown exponentially. Recently, the COVID-19 epidemic has changed rapidly in China, and there has been controversy over how to carry out surgical operations for patients with lung neoplastic lesions. Some studies have shown that lung cancer patients undergoing surgery are more likely to experience respiratory failure and perioperative death after contracting COVID-19 than the general population, however, delays in cancer treatment are also associated with increased mortality among these patients. In particular, the novel coronavirus Omikron variant has a higher transmissibility and may escape the immunity obtained through the previous novel coronavirus infection and vaccination. In order to minimize the risk of novel coronavirus infection in surgical patients, it is necessary to develop new treatment guidelines, expert consensus and preventive measures. However, the current rapid change of the epidemic situation has led to insufficient time and evidence to develop guidelines and consensus. Therefore, thoracic surgeons need to evaluate specific patient populations at higher risk of severe complications before surgery and weigh the benefit of surgical treatment against the risk of novel coronavirus infection. We try to give some recommendations on lung surgery during the current domestic epidemic situation based on the guidelines and consensus of oncology and thoracic surgery organizations in different regions on lung surgery.
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Humans ; Lung Neoplasms/complications* ; COVID-19 ; SARS-CoV-2 ; Multiple Pulmonary Nodules ; Pandemics/prevention & control* ; Lung