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预防性癌症疫苗引发的人类抗MUC1抗体具有多种效应功能。

Preventative Cancer Vaccine-Elicited Human Anti-MUC1 Antibodies Have Multiple Effector Functions.

作者信息

McKeague Michelle L, Lohmueller Jason, Dracz Matthew T, Saadallah Najla, Ricci Eric D, Beckwith Donella M, Ayyalasomayajula Ramya, Cudic Maré, Finn Olivera J

机构信息

Department of Immunology, University of Pittsburgh, Pittsburgh, PA 15213, USA.

Division of Surgical Oncology, Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA.

出版信息

Antibodies (Basel). 2024 Oct 10;13(4):85. doi: 10.3390/antib13040085.

DOI:10.3390/antib13040085
PMID:39449327
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11503386/
Abstract

BACKGROUND/OBJECTIVES: Mucin-1 (MUC1) is a transmembrane glycoprotein that is overexpressed and hypoglycosylated in premalignant and malignant epithelial cells compared to normal cells, creating a target antigen for humoral and cellular immunity. Healthy individuals with a history of advanced colonic adenomas and at high risk for colon cancer were enrolled in a clinical trial to evaluate the feasibility of using a MUC1 peptide vaccine to prevent colon cancer. Anti-MUC1 antibodies elicited by this vaccine were cloned using peripheral blood B cells and sera collected two weeks after a one-year booster. Twelve of these fully human monoclonal antibodies (mAb) were tested for binding to MUC1+ target cells, and three with the highest binding were further evaluated for various effector functions important for tumor rejection.

METHODS

Immune cells were incubated together with target cells expressing variations in the number, distance, and membrane anchoring properties of the MUC1 epitope in the presence of each mAb.

RESULTS

All three mAbs mediated antibody-dependent cytokine release (ADCR), antibody-dependent cellular cytotoxicity (ADCC), and antibody-dependent cellular phagocytosis (ADCP). Two also mediated antibody-dependent trogocytosis/trogoptosis (ADCT). None were capable of complement-dependent cytotoxicity (CDC).

CONCLUSIONS

ADCP and ADCT functions were more efficient when antibodies bound epitopes proximal to and anchored to the membrane, providing insight for future therapeutic antibody validation strategies.

摘要

背景/目的:粘蛋白-1(MUC1)是一种跨膜糖蛋白,与正常细胞相比,其在癌前和恶性上皮细胞中过度表达且糖基化不足,从而产生了体液免疫和细胞免疫的靶抗原。有晚期结肠腺瘤病史且患结肠癌风险高的健康个体被纳入一项临床试验,以评估使用MUC1肽疫苗预防结肠癌的可行性。使用外周血B细胞和在一年加强免疫后两周收集的血清克隆由该疫苗引发的抗MUC1抗体。对其中12种全人单克隆抗体(mAb)进行了与MUC1+靶细胞结合的测试,并对结合力最强的3种抗体进一步评估了对肿瘤排斥重要的各种效应功能。

方法

在每种mAb存在的情况下,将免疫细胞与表达MUC1表位数量、距离和膜锚定特性不同的靶细胞一起孵育。

结果

所有3种mAb均介导抗体依赖性细胞因子释放(ADCR)、抗体依赖性细胞毒性(ADCC)和抗体依赖性细胞吞噬作用(ADCP)。其中2种还介导抗体依赖性细胞串扰/凋亡(ADCT)。均无补体依赖性细胞毒性(CDC)作用。

结论

当抗体结合靠近膜并锚定在膜上的表位时,ADCP和ADCT功能更有效,这为未来治疗性抗体验证策略提供了思路。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/f4b3f2ae576d/antibodies-13-00085-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/6e5de6db90ea/antibodies-13-00085-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/8eafc00ec3a1/antibodies-13-00085-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/b09ce560ce9f/antibodies-13-00085-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/ac45a8671d67/antibodies-13-00085-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/509873609b6a/antibodies-13-00085-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/6ef44afbc9ce/antibodies-13-00085-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/0aab202a5be8/antibodies-13-00085-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/f4b3f2ae576d/antibodies-13-00085-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/6e5de6db90ea/antibodies-13-00085-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/8eafc00ec3a1/antibodies-13-00085-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/b09ce560ce9f/antibodies-13-00085-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/ac45a8671d67/antibodies-13-00085-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/509873609b6a/antibodies-13-00085-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/6ef44afbc9ce/antibodies-13-00085-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/0aab202a5be8/antibodies-13-00085-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3b85/11503386/f4b3f2ae576d/antibodies-13-00085-g008.jpg

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