The successful application of immunotherapy in the treatment of cancer relies on effective engagement of immune cells in the tumor microenvironment. Phosphoinositide 3-kinase γ (PI3Kγ) is highly expressed in tumor-associated macrophages, and its expression levels are associated with tumor immunosuppression and growth. Selective inhibition of PI3Kγ offers a promising strategy in immuno-oncology, which has led to the development of numerous potent PI3Kγ inhibitors with variable selectivity profiles. To facilitate further investigation of the therapeutic potential of PI3Kγ inhibition, we required a potent and PI3Kγ-selective tool compound with sufficient metabolic stability for use in future in vivo studies. Herein, we describe some of our efforts to realize this goal through the systematic study of SARs within a series of 7-azaindole-based PI3Kγ inhibitors. The large volume of data generated from this study helped guide our subsequent lead optimization efforts and will inform further development of PI3Kγ-selective inhibitors for use in immunomodulation.

中文翻译：

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发现有效和选择性的 7-氮杂吲哚异吲哚啉酮基 PI3Kγ 抑制剂

免疫疗法在癌症治疗中的成功应用依赖于免疫细胞在肿瘤微环境中的有效参与。磷酸肌醇 3-激酶γ（PI3Kγ）在肿瘤相关巨噬细胞中高表达，其表达水平与肿瘤免疫抑制和生长有关。PI3Kγ 的选择性抑制为免疫肿瘤学提供了一种有前景的策略，这导致开发了许多具有可变选择性特征的有效 PI3Kγ 抑制剂。为了促进对 PI3Kγ 抑制的治疗潜力的进一步研究，我们需要一种有效的 PI3Kγ 选择性工具化合物，具有足够的代谢稳定性，以供将来在体内使用学习。在此，我们描述了我们通过系统研究一系列基于 7-氮杂吲哚的 PI3Kγ 抑制剂中的 SAR 来实现这一目标的一些努力。本研究产生的大量数据有助于指导我们随后的先导优化工作，并将为用于免疫调节的 PI3Kγ 选择性抑制剂的进一步开发提供信息。