Objective:To investigate the molecular mechanism by which 2',4'-dihydroxychalcone(D2)inhibits proliferation,migration,and epithelial-mesenchymal transition(EMT)in colorectal cancer cells through miR-7-5p-mediated autophagy.Methods:Human colorectal cancer cell lines HCT-15 and SW620 were treated with D2 at concentrations of 0,12.5,25,and 50 μmol/L.Cell proliferation and clonogenic capacity were evaluated using MTT and colony formation assays.Cell migration was assessed by wound healing and Transwell assays.WB assay was used to detect the expression of EMT-related proteins,autophagy-related proteins,and key components of the PI3K/AKT/mTOR pathway.Autophagosome formation was visualized by immunofluorescence staining.TCGA database and KEGG pathway analyses were performed to evaluate miR-7-5p expression and its association with colorectal cancer.RT-qPCR was used to quantify miR-7-5p expression,and lentiviral transduction was employed to establish stable miR-7-5p knockdown or overexpression cell lines.Results:D2 significantly inhibited colorectal cancer cell proliferation,migration,and EMT(P<0.05 or P<0.01).TCGA and KEGG analyses revealed that miR-7-5p expression was downregulated in colorectal cancer and closely associated with disease progression.D2 treatment(12.5,25,and 50 μmol/L)significantly upregulated miR-7-5p expression in HCT-15 and SW620 cells(P<0.01).At 25 μmol/L,D2 increased the expression of autophagy-related proteins(LC3 and p-ULK1)and inhibited the PI3K/AKT/mTOR signaling pathway(P<0.05),accompanied by increased autophagosome formation(P<0.01).In miR-7-5p-knockdown cells treated with D2,the levels of LC3 and p-ULK1 were significantly reduced compared to D2-only treated cells(P<0.05 or P<0.01).Conclusion:D2 upregulates miR-7-5p to induce autophagy,thereby inhibiting colorectal cancer cell proliferation,migration,and EMT,possibly through suppression of the PI3K/AKT/mTOR signaling pathway.

Objective:To discuss the surgical techniques and clinical value of pure laparoscopic radical nephroureterectomy without changing patient’s position in the treatment of upper tract urothelial carcinoma(UTUC).Methods:The clinical data of 28 patients, who underwent pure laparoscopic radical nephroureterectomy with single patient’s position in the treatment of UTUC , were collected and analyzed, including 16 males and 12 females, with the median age of (68.3±9.7)(45-80)years.There were 20 renal pelvic carcinoma and 8 ureteral carcinoma with preoperative clinical TNM stage of T l-T 3N 0M 0. Among them, 9 tumors were located in right side, while 19 in left side. With the patient in a contralateral oblique position at 50°-70°. , an additional instrument hole is added at the midpoint between the umbilicus and pubic symphysis, besides the classical four holes. Nephrectomy was carried out routinely after the pneumoperitoneum was built, and then the ureter was dissected all the way down to bladder wall. The bladder was closed with 3-0 absorbable barbed suture following the bladder cuff being incised.The specimen were retrieved through the extended incision of the lower abdomen trocar or through vagina if suitable. There was no need to change patient’s positioning during operation. Results:All surgical procedures were successfully performed without conversion to open surgery. There was no serious bleeding or other operation related complications. The mean operative time was (136.3±48.7)(70-270)min, while the estimated blood loss was (46.3±38.3)(10-200)ml. The mean postoperative drainage volume (287.3±196.6)(30-910)ml, while the mean postoperative drainage time was 3.2(1-5)d. Their intestinal function recovered 1.5(1-4) d postoperatively. Their average postoperative hospital stay was(6.1±1.7)(3-12)d.Pathological results showed urothelial carcinoma in all cases, including 21 high grade and 7 low grade. Lymphovascular invasion was found in 7 cases of high-grade urothelial carcinoma. All the surgical margins were negative. The median follow-up was(9.2±4.8)(1-12)months, and there was neither tumor recurrence nor distant metastasis.Conclusions:Compared with the traditional operation method, single posture pure transperitoneal laparoscopic radical nephroureterectomy have the advantages of standardized operation method, simple procedure, less trauma, less bleeding and quick postoperative recovery. It is a safe and effective minimally invasive technology for the treatment of UTUC.

OBJECTIVE: To identify the mutation type of non-muscle myosin heavy chain 9 (MYH9) gene and investigate the clinical features of a pedigree affected with MYH9 gene-related disease. METHODS: Peripheral blood samples of the proband and his family members were collected. Routine blood tests were performed, which included platelet counting and Wright's staining to observe the granulocyte inclusions and giant platelets. PCR was used to amplify exons 2, 17, 27, 31, 39 and 41 of the MYH9 gene, and the mutation site was determined by Sanger sequencing. RESULTS: All patients from the pedigree presented a typical triad of thrombocytopenia, giant platelets, and inclusion bodies in leukocytes. In addition, two patients had nephritis and cataract. All affected members carried a heterozygous missense mutation of c.5521G>A (p.glu1841Lys) in exon 39 of the MYH9 gene. The same mutation was not found among healthy members of the pedigree and the controls. CONCLUSION The c.5521G>A (p.Glu1841Lys) mutation in the MYH9 gene probably underlies the MYH9-related disease in this pedigree.
Female ; Genetic Testing ; Humans ; Male ; Molecular Motor Proteins ; genetics ; Mutation ; Myosin Heavy Chains ; genetics ; Pedigree ; Thrombocytopenia