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手术引起的女性更年期可促进全脑缺血后的海马区淀粉样变性(英文)
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作者 Erin L.Scott Quan-Guang Zhang +4 位作者 Yan Dong Dong Han Rui-Min Wang ratna k.vadlamudi Darrell W.Brann 《Journal of Sport and Health Science》 SCIE 2014年第3期206-216,共11页
背景:研究发现,过早绝经的女性患痴呆的风险加倍,死干神经功能障碍的风险也增加5倍,但其分子机制还不明确。本研究试图探讨卵巢1 7β-雌二醇(E2)持续降低是否可能促进海马区局部缺血引起的淀粉状蛋白生成。方法:用已建造的早期手术性更... 背景:研究发现,过早绝经的女性患痴呆的风险加倍,死干神经功能障碍的风险也增加5倍,但其分子机制还不明确。本研究试图探讨卵巢1 7β-雌二醇(E2)持续降低是否可能促进海马区局部缺血引起的淀粉状蛋白生成。方法:用已建造的早期手术性更年期大鼠模型(双侧卵巢切除术10周),在手术后立即给予E2(短期E2缺乏,STED)或卵巢切除术后期给予E2(长期E2缺乏,LTED)。在连续1周皮下注射E2后,对于动物进行全脑缺血10 min,再评价LTED对缺血诱导的海马CA1区淀粉样蛋白生成的作用。结果:海马区β淀粉样蛋白(Aβ)水平在全脑缺血后没有明显增加,而LTED雌鼠在全脑缺血后内源性Aβ水平快速稳健提高。在STED的雌鼠,我们观察到全脑缺血后减少ADAM10在海马CA1区的表达,而E2治疗能保持ADAM10在海马CA1区的表达水平。同时,全脑缺血后引起BACEl的增强,而E2可以在相同脑区域降低BACE1水平。然而,我们在LTED雌鼠观察到E2治疗失去了在海马CA1区对ADAM 10、ADAM 17和BACE1水平的调节,说明早期内源性雌激素长期缺乏会加重脑缺血后导致的Aβ-生成。同时,我们还观察到,LTED雌鼠全脑缺血后,E2还失去了对tau蛋白高度磷酸化的调节,为体内雌激素水平下降和脑缺血所导致的粉状蛋白增加的机制提供了证据。结论:本研究部分解释了过早绝经的妇女有高风险患痴呆和过早死亡的机制,并认为及时补充E2会使得神经系统得到最大的保护作用。 展开更多
关键词 海马CA1区 淀粉样蛋白 脑缺血 绝经 手术 卵巢切除术 老年痴呆症 潜在风险
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Cancer therapy using natural ligands that target estrogen receptor beta 被引量:5
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作者 Gangadhara R Sareddy ratna k.vadlamudi 《Chinese Journal of Natural Medicines》 SCIE CAS CSCD 2015年第11期801-807,共7页
Estrogen receptor beta(ERβ) is one of the two key receptors(ERα, ERβ) that facilitate biological actions of 17β-estradiol(E2). ERβ is widely expressed in many tissues, and its expression is reduced or lost during... Estrogen receptor beta(ERβ) is one of the two key receptors(ERα, ERβ) that facilitate biological actions of 17β-estradiol(E2). ERβ is widely expressed in many tissues, and its expression is reduced or lost during progression of many tumors. ERβ facilitates estrogen signaling by both genomic(classical and non-classical) and extra-nuclear signaling. Emerging evidence suggests that ERβ functions as a tissue-specific tumor suppressor with anti-proliferative actions. Recent studies have identified a number of naturally available selective ERβ agonists. Targeting ERβ using its naturally available ligands is an attractive approach for treating and preventing cancers. This review presents the beneficial actions of ERβ signaling and clinical utility of several natural ERβ ligands as potential cancer therapy. 展开更多
关键词 药理学 药物 性质 生化 化学
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Targeting LIF/LIFR signaling in cancer 被引量:5
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作者 Suryavathi Viswanadhapalli Kalarickal V.Dileep +2 位作者 Kam Y.J.Zhang Hareesh B.Nair ratna k.vadlamudi 《Genes & Diseases》 SCIE 2022年第4期973-980,共8页
Leukemia inhibitory factor (LIF), and its receptor (LIFR), are commonly over-expressed in many solid cancers and recent studies have implicated LIF/LIFR axis as a promising clinical target for cancer therapy. LIF/LIFR... Leukemia inhibitory factor (LIF), and its receptor (LIFR), are commonly over-expressed in many solid cancers and recent studies have implicated LIF/LIFR axis as a promising clinical target for cancer therapy. LIF/LIFR activate oncogenic signaling pathways including JAK/STAT3 as immediate effectors and MAPK, AKT, mTOR further downstream. LIF/LIFR signaling plays a key role in tumor growth, progression, metastasis, stemness and therapy resistance. Many solid cancers show overexpression of LIF and autocrine stimulation of the LIF/LIFR axis;these are associated with a poorer relapse-free survival. LIF/LIFR signaling also plays a role in modulating multiple immune cell types present in tumor micro environment (TME). Recently, two targeted agents that target LIF (humanized anti-LIF antibody, MSC-1) and LIFR inhibitor (EC359) were under development. Both agents showed effectivity in preclinical models and clinical trials using MSC-1 antibody are in progress. This article reviews the significance of LIF/LIFR pathways and inhibitors that disrupt this process for the treatment of cancer. 展开更多
关键词 LIF LIFR LIFR inhibitor STAT3 Targeted therapy
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