为研究电刺激对宰后牦牛肉成熟过程中Troponin-T和Desmin降解及嫩度的影响,本实验利用聚丙烯酰胺凝胶电泳(SDS-PAGE)、剪切力法及肌原纤维小片化指数法分别对比测定并动态监测宰后不同处理(电刺激、未电刺激)对牦牛的冈上肌、背阔肌和...为研究电刺激对宰后牦牛肉成熟过程中Troponin-T和Desmin降解及嫩度的影响,本实验利用聚丙烯酰胺凝胶电泳(SDS-PAGE)、剪切力法及肌原纤维小片化指数法分别对比测定并动态监测宰后不同处理(电刺激、未电刺激)对牦牛的冈上肌、背阔肌和半腱肌3个部位肉在成熟0,1,2,3,5,7,14 d时Troponin-T、Desmin、剪切力及MFI影响的变化特点。结果表明:电刺激组牦牛三个部位肉Troponin-T和Desmin的降解速度和降解程度均较高,且两个处理组背阔肌Troponin-T 28 k Da、Desmin 38 k Da和36 k Da特征降解产物出现的时间较其他两个部位均早,降解程度也较高;成熟14 d后,电刺激组牦牛冈上肌、背阔肌和半腱肌的剪切力值下降百分率较未电刺激组分别显著高2.93%、9.47%、5.08%(p<0.05),但电刺激对MFI值无显著影响。由此可见,电刺激处理能显著加快宰后牦牛肉肌原纤维骨架蛋白Troponin-T和Desmin的降解程度及剪切力的下降速度,且背阔肌的宰后嫩化较其他两个部位快。展开更多
Theso-called perivascular epithelioid cell neoplasm(PEComa)family includes angiomy olipoma, clear cell ‘sugar’tumor (CCST), lymphangioleiomyomatosis, and clear cell myomelanocytic tumor (CCMMT). These rare tumors ar...Theso-called perivascular epithelioid cell neoplasm(PEComa)family includes angiomy olipoma, clear cell ‘sugar’tumor (CCST), lymphangioleiomyomatosis, and clear cell myomelanocytic tumor (CCMMT). These rare tumors are characterized by the coexpression of melanocytic and muscle markers. They have been recognized in an increasing number of sites but currently only one case of PEComa, of the CCMMT subtype, has been reported in the skin in abstract form. We provide the clinicopathologic description of a case of extrapulmonary CCST located in the dermis and superficial subcutis of the thigh of a 60-year-old female. The lesion was composed of nests of epithelioid and spindle cells with abundant clear to granular cytoplasm and distinct cell borders. The tumor showed strong and diffuse immunoreactivity with HMB-45. Scattered cells expressed desmin and h-caldesmon. Antibodies to S-100 protein, melan-A, cytokeratins, and smooth muscle actin were negative. This first case of cutaneous PEComa of the CCST type expands the differential diagnosis of clear cell/granular cell tumors of the skin.展开更多
Background. Epithelioid leiomyosarcomas arising from the uterine cervix are extremely rare neoplasms, with only three cases reported in the English literature. Case. A 53- year- old Japanese woman was admitted to our ...Background. Epithelioid leiomyosarcomas arising from the uterine cervix are extremely rare neoplasms, with only three cases reported in the English literature. Case. A 53- year- old Japanese woman was admitted to our university hospital due to massive vaginal bleeding from a cervical tumor. A total hysterectomy with bilateral salpingooop- horectomy was performed. Histological findings, including immunohistochemical study using desmin, SMA, cytokeratin, S- 100, HMB- 45, vimentin, mela- A, and CD68, led to a diagnosis of epithelioid leiomyosarcoma of the uterine cervix. The patient underwent adjuvant chemotherapy and has been disease- free for over 20 months. Conclusion. Immunohistochemical studies may be needed to differentiate among the alternative diagnoses of malignant melanoma, metastatic carcinoma, and epithelioid sarcoma. Additional cases are needed to develop optimal management strategies and to predict prognosis.展开更多
文摘为研究电刺激对宰后牦牛肉成熟过程中Troponin-T和Desmin降解及嫩度的影响,本实验利用聚丙烯酰胺凝胶电泳(SDS-PAGE)、剪切力法及肌原纤维小片化指数法分别对比测定并动态监测宰后不同处理(电刺激、未电刺激)对牦牛的冈上肌、背阔肌和半腱肌3个部位肉在成熟0,1,2,3,5,7,14 d时Troponin-T、Desmin、剪切力及MFI影响的变化特点。结果表明:电刺激组牦牛三个部位肉Troponin-T和Desmin的降解速度和降解程度均较高,且两个处理组背阔肌Troponin-T 28 k Da、Desmin 38 k Da和36 k Da特征降解产物出现的时间较其他两个部位均早,降解程度也较高;成熟14 d后,电刺激组牦牛冈上肌、背阔肌和半腱肌的剪切力值下降百分率较未电刺激组分别显著高2.93%、9.47%、5.08%(p<0.05),但电刺激对MFI值无显著影响。由此可见,电刺激处理能显著加快宰后牦牛肉肌原纤维骨架蛋白Troponin-T和Desmin的降解程度及剪切力的下降速度,且背阔肌的宰后嫩化较其他两个部位快。
文摘Theso-called perivascular epithelioid cell neoplasm(PEComa)family includes angiomy olipoma, clear cell ‘sugar’tumor (CCST), lymphangioleiomyomatosis, and clear cell myomelanocytic tumor (CCMMT). These rare tumors are characterized by the coexpression of melanocytic and muscle markers. They have been recognized in an increasing number of sites but currently only one case of PEComa, of the CCMMT subtype, has been reported in the skin in abstract form. We provide the clinicopathologic description of a case of extrapulmonary CCST located in the dermis and superficial subcutis of the thigh of a 60-year-old female. The lesion was composed of nests of epithelioid and spindle cells with abundant clear to granular cytoplasm and distinct cell borders. The tumor showed strong and diffuse immunoreactivity with HMB-45. Scattered cells expressed desmin and h-caldesmon. Antibodies to S-100 protein, melan-A, cytokeratins, and smooth muscle actin were negative. This first case of cutaneous PEComa of the CCST type expands the differential diagnosis of clear cell/granular cell tumors of the skin.
文摘Background. Epithelioid leiomyosarcomas arising from the uterine cervix are extremely rare neoplasms, with only three cases reported in the English literature. Case. A 53- year- old Japanese woman was admitted to our university hospital due to massive vaginal bleeding from a cervical tumor. A total hysterectomy with bilateral salpingooop- horectomy was performed. Histological findings, including immunohistochemical study using desmin, SMA, cytokeratin, S- 100, HMB- 45, vimentin, mela- A, and CD68, led to a diagnosis of epithelioid leiomyosarcoma of the uterine cervix. The patient underwent adjuvant chemotherapy and has been disease- free for over 20 months. Conclusion. Immunohistochemical studies may be needed to differentiate among the alternative diagnoses of malignant melanoma, metastatic carcinoma, and epithelioid sarcoma. Additional cases are needed to develop optimal management strategies and to predict prognosis.
