ABSTRACT
Hydroxysteroid dehydrogenases (HSDs) play an important role in the metabolism of steroids and xenobiotics. However, the function of HSDs in invertebrates is unclear. In this study, we cloned the hydroxysteroid dehydrogenase-like 2 (HSDL2) gene in Perinereis aibuhitensis, which is 1652 bp in length, encoding 400 amino acids. This sequence contains conserved short-chain dehydrogenase and sterol carrier protein-2 domain, and the alignment analysis showed its close relationship with other invertebrate HSDL2. Further, the tissue distribution analysis of the HSDL2 gene showed it is expressed strongly in the intestine. The expression level of HSDL2 after inducement with bisphenol A (BPA) was also detected both at transcriptional and translational levels. The results inferred that BPA exposure can induce HSDL2 expression, and the inductive effect was obvious in the high-concentration BPA group (100 µg/L). In summary, our results showed the detoxification function of HSDL2 in polychaetes.
ABSTRACT
PURPOSE: To explore the clinical application value of color Doppler ultrasound combined with computed tomography (CT) in the diagnosis of axillary lymph node metastasis (ALNM) in breast cancer. METHODS: From January 2016 to June 2018, 189 breast cancer patients who underwent radical mastectomy in our hospital were included and retrospectively analyzed. All patients had preoperative color Doppler ultrasound and CT examination of mammary gland and axillary lymph nodes, with pathological diagnosis as the gold standard. Eighty-eight cases were divided into axillary lymph node metastasis group (metastatic group) and 101 cases formed the non-axillary lymph node metastasis group (non-metastatic group). The ultrasound and CT imaging of axillary lymph nodes were analyzed to evaluate the value of color Doppler ultrasound combined with CT in the assessment of axillary lymph node metastasis in breast cancer. RESULTS: Ultrasonographic metastatic lymph nodes showed unclear borders and eccentric thickening of the cortex. The enhancement scan showed obvious heterogeneous enhancement and disappearance of lymphatic structure. The sensitivity, accuracy, and negative predictive value of ultrasonography combined with CT were 92.05%, 90.48% and 92.78%, retrospectively, which were significantly improved compared with those in the individual tests (x2=13.41, 6.126, 8.933, p=0.001, 0.047, 0.011), with significant statistical difference. CONCLUSIONS: Color Doppler ultrasound combined with CT examination can significantly improve the detected rate of axillary lymph node metastasis in breast cancer before surgery, and provide a reliable basis for the treatment options on breast cancer patients before surgery.
