肉芽肿性多血管炎(granulomatosis with polyangiitis,GPA)是一种原发性、坏死性、肉芽肿性小血管炎,大多数患者出现血清学抗蛋白酶3(RR3)及抗中性粒细胞胞质抗体(ANCA)阳性[1],其临床表现多样,通常可影响耳、鼻、眼、呼吸道、肾脏等器...肉芽肿性多血管炎(granulomatosis with polyangiitis,GPA)是一种原发性、坏死性、肉芽肿性小血管炎,大多数患者出现血清学抗蛋白酶3(RR3)及抗中性粒细胞胞质抗体(ANCA)阳性[1],其临床表现多样,通常可影响耳、鼻、眼、呼吸道、肾脏等器官,并可累及神经系统、皮肤等。GPA的治疗包括诱导缓解和维持治疗,其中诱导缓解时主要以糖皮质激素联合环磷酰胺(CTX)或利妥昔单抗(RTX)为主。虽然大多数GPA患者经过正规有效的治疗可得到有效缓解,但机会感染的风险明显增加[2],尤其是肺孢子菌肺炎(pneumocystis pneumonia,PCP)最为凶险致命,且常出现在诱导缓解及初始治疗的前12个月[3]。因此,及早对GPA患者开展有效的PCP预防极为重要。展开更多
Background Recent studies have shown the LyP-1 peptide can home to either tumor lymphatics or the tumor cells and be internalized by targeted cells. This study aimed to investigate the possibility of using Na1311 labe...Background Recent studies have shown the LyP-1 peptide can home to either tumor lymphatics or the tumor cells and be internalized by targeted cells. This study aimed to investigate the possibility of using Na1311 labeled LyP-1 peptide as an imaging agent or a therapeutic radiopharmaceutical in breast carcinoma and its metastasis. Methods The 10-mer cyclic peptide contained the LyP-1 sequence （YCGNKRTRGC） was synthesized by the solid phase method. Disulfide bonds between the cysteines maintain the cyclic structure. The LyP-1 peptide was labeled with Na1311 using the chloramine-T method. The [1311] LyP-1 peptide and a [1311] control peptide were injected via tail vein into nude mice bearing MDA-MB-435 tumor xenografts. Biodistribution and imaging results in vivo were obtained. Results The labeling efficiencies of LyP-1 peptide reached 80%＋5% （n=5）. The radiochemical purity was about 96%. The radiochemical purity of the labeled compound remains 92% at 24 hours in human serum at 37~C. In the biodistribution studies, the [1311] LyP-1 peptide accumulated in the tumor to a higher level than in other organs. The [1311] LyP-1 peptide can successfully image the tumor in nude mice bearing MDA-MB-435 tumor xenografts. Conclusions The LyP-1 peptide could be effectively labeled with Na1311 and the labeled compound is stable in human serum at 37℃ for 24 hours. The high specificity of [1311] LyP-1 peptide suggests it may be a promising new radiotracer for identifying tumors.展开更多
文摘肉芽肿性多血管炎(granulomatosis with polyangiitis,GPA)是一种原发性、坏死性、肉芽肿性小血管炎,大多数患者出现血清学抗蛋白酶3(RR3)及抗中性粒细胞胞质抗体(ANCA)阳性[1],其临床表现多样,通常可影响耳、鼻、眼、呼吸道、肾脏等器官,并可累及神经系统、皮肤等。GPA的治疗包括诱导缓解和维持治疗,其中诱导缓解时主要以糖皮质激素联合环磷酰胺(CTX)或利妥昔单抗(RTX)为主。虽然大多数GPA患者经过正规有效的治疗可得到有效缓解,但机会感染的风险明显增加[2],尤其是肺孢子菌肺炎(pneumocystis pneumonia,PCP)最为凶险致命,且常出现在诱导缓解及初始治疗的前12个月[3]。因此,及早对GPA患者开展有效的PCP预防极为重要。
文摘Background Recent studies have shown the LyP-1 peptide can home to either tumor lymphatics or the tumor cells and be internalized by targeted cells. This study aimed to investigate the possibility of using Na1311 labeled LyP-1 peptide as an imaging agent or a therapeutic radiopharmaceutical in breast carcinoma and its metastasis. Methods The 10-mer cyclic peptide contained the LyP-1 sequence （YCGNKRTRGC） was synthesized by the solid phase method. Disulfide bonds between the cysteines maintain the cyclic structure. The LyP-1 peptide was labeled with Na1311 using the chloramine-T method. The [1311] LyP-1 peptide and a [1311] control peptide were injected via tail vein into nude mice bearing MDA-MB-435 tumor xenografts. Biodistribution and imaging results in vivo were obtained. Results The labeling efficiencies of LyP-1 peptide reached 80%＋5% （n=5）. The radiochemical purity was about 96%. The radiochemical purity of the labeled compound remains 92% at 24 hours in human serum at 37~C. In the biodistribution studies, the [1311] LyP-1 peptide accumulated in the tumor to a higher level than in other organs. The [1311] LyP-1 peptide can successfully image the tumor in nude mice bearing MDA-MB-435 tumor xenografts. Conclusions The LyP-1 peptide could be effectively labeled with Na1311 and the labeled compound is stable in human serum at 37℃ for 24 hours. The high specificity of [1311] LyP-1 peptide suggests it may be a promising new radiotracer for identifying tumors.
