ABSTRACT
@#Objective To evaluate the role of autophagy in inflammatory response in the lungs of silicosis rats. Methods The specific pathogen-free healthy male Wistar rats were randomly divided into four groups with 10 rats in each group. The rats in the control group were given an equal volume of 0.9% sodium chloride solution; all rats in the silicon dioxide (SiO2 ) group, the SiO2 + 3-methyladenine (3-MA) group, and the SiO2 +rapamycin (RAPA) group were given a mass concentration of 0.05 mg/L of SiO2 suspension (1.0 mL/rat) to establish a rat model of silicosis using non-exposed tracheal instillation method. Two days before SiO2 exposure, the rats in SiO2 +3-MA group were intraperitoneally injected with 3-MA at a dose of 2.5 mg/kg body weight. The rats in the SiO2 +RAPA group were intraperitoneally injected with a dose of RAPA 1.0 mg/kg body weight, once a day, and once every other day after modeling, for a total of 10 injections. The pathological changes in the lung tissue of the rats in each group were evaluated using hematoxylin-eosin and Masson staining. The relative expression levels of transforming growth factor-β (TGF-β) , interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) in the lung tissue of the rats in each group were detected using enzyme-linked immunosorbent assay. The relative expression levels of microtubule-associated protein 1 light chain 3 (LC3) and yeast autophagy-related gene 6 (Beclin1) in lung tissue of rats in each group were detected by Western blotting. Results The pathological observation of rat lung tissue showed that scattered inflammatory nodules and interstitial inflammatory cells were found in the lung tissue of the rats in the SiO2 group. In the SiO2 +3-MA group, the inflammation in the lung tissue was more severe and the alveolar cavity had viscous secretions. The rats in the SiO2 +RAPA group had less inflammation and smaller inflammatory nodules than the SiO2 group. Compared with the control group, the TNF-α, IL-1β, TGF-β, Beclin1 protein relative expression levels and LC3 Ⅱ/Ⅰ ratio in the lung tissue were increased in the SiO2 group (all P<0.05). Compared with the SiO2 group, the relative expression levels of TGF-β and TNF-α in the lung tissue of the rats increased (all P<0.05), and the ratio of LC3 Ⅱ/Ⅰ and Beclin1 protein relative expression decreased in the SiO2+3-MA group (all P<0.05). Compared with the SiO2+ 3-MA group, the relative expression levels of TNF- α, IL-1β and TGF- β in the lung tissue of the SiO2 +RAPA group were decreased (all P<0.05), and the LC3Ⅱ/Ⅰ ratio and the relative expression level of Beclin1 protein were increased (all P<0.05). Conclusion Autophagy occurs when inflammatory reaction occurs in the lungs of silicosis model rats; autophagy has inhibitory effect on pulmonary inflammation.
ABSTRACT
<p><b>OBJECTIVE</b>To assess the value of PET in the identification of cervical nodal metastases of tongue cancer in comparison with CT/MRI and clinical palpation.</p><p><b>METHODS</b>Thirty-eight patients with tongue cancer underwent PET and CT/MRI within 2 weeks before surgery. The results of PET, CT/MRI, and clinical palpation were interpreted separately to assess the regional lymph node status, using histopathological analysis as the golden standard. The differences in the sensitivity, specificity and accuracy among the imaging modalities and clinical palpation were analyzed.</p><p><b>RESULTS</b>The sensitivity of PET for nodal metastasis identification was 11.1% higher than that of CT/MRI (83.3% vs 72.2%, P=0.423) and 16.6% higher than that of clinical palpation (83.3% vs 66.7%, P=0.248). The specificity of PET was 5% higher than that of CT/MRI (80% vs 75%, P=0.703) and 15% higher than that of clinical palpation (80% vs 65%, P=0.288). The accuracy of PET, CT/MRI, and clinical palpation in identifying cervical nodal metastases was 81.6%, 73.7% and 65.8%, respectively.</p><p><b>CONCLUSION</b>The sensitivity, specificity and accuracy of PET for detecting cervical nodal metastases are greater than those of CT/MRI and clinical palpation. Although the results failed to show statistically significant differences, we still recommend that PET be used as a supplementary modality for identifying nodal metastases of tongue cancer.</p>
Subject(s)
Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Lymphatic Metastasis , Diagnostic Imaging , Magnetic Resonance Imaging , Positron-Emission Tomography , Sensitivity and Specificity , Tomography, X-Ray Computed , Tongue Neoplasms , Diagnostic Imaging , PathologyABSTRACT
We investigated the fatty acid profiles of muscle from large yellow croaker (Pseudosciaena crocea R.) of different age. One- and two-year-old fish were cultured in floating net cages and sampled randomly for analysis. Moisture, protein, lipid and ash contents were determined by methods of Association of Analytical Chemist (AOAC) International. Fatty acid profile was determined by gas chromatography. Crude protein, fat, moisture and ash contents showed no significant differences between the two age groups. The contents of total polyunsaturated fatty acids and docosahexaenoic acid (DHA) were significantly higher and eicosapentaenoic acid (EPA) content was significantly lower in the two-year-old large yellow croaker than in the one-year-old (P<0.05). No significant differences were observed in the contents of total saturated fatty acids and monounsaturated fatty acids, or the ratio of n-3/n-6 fatty acids among the large yellow croakers of the two age groups. We conclude that large yellow croakers are good food sources of EPA and DHA.