Fenretinide (4‐HPR) is a synthetic derivative of all‐trans‐retinoic acid (ATRA) characterised by improved therapeutic properties and toxicological profile relative to ATRA. 4‐HPR has been mostly investigated as an anti‐cancer agent, but recent studies showed its promising therapeutic potential for preventing metabolic syndrome. Several biological targets are involved in 4‐HPR's activity, leading to the potential use of this molecule for treating different pathologies. However, although 4‐HPR displays quite well‐understood multitarget promiscuity with regards to pharmacology, interpreting its precise physiological role remains challenging. In addition, despite promising results in vitro, the clinical efficacy of 4‐HPR as a chemotherapeutic agent has not been satisfactory so far. Herein, we describe the preparation of a library of 4‐HPR analogues, followed by the biological evaluation of their anti‐cancer and anti‐obesity/diabetic properties. The click‐type analogue 3 b showed good capacity to reduce the amount of lipid accumulation in 3T3‐L1 adipocytes during differentiation. Furthermore, it showed an IC₅₀ of 0.53±0.8 μM in cell viability tests on breast cancer cell line MCF‐7, together with a good selectivity (SI=121) over noncancerous HEK293 cells. Thus, 3 b was selected as a potential PET tracer to study retinoids in vivo, and the radiosynthesis of [¹⁸F]3b was successfully developed. Unfortunately, the stability of [¹⁸F]3b turned out to be insufficient to pursue imaging studies.

中文翻译：

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芬维A胺类似物作为抗癌和代谢综合症的预防剂的设计，合成，放射合成和生物学评估。

Fenretinide（4-HPR）是全反式视黄酸（ATRA）的合成衍生物，具有相对于ATRA更高的治疗特性和毒理学特征。4-HPR作为抗癌药已被广泛研究，但最近的研究表明，4-HPR在预防代谢综合征方面具有广阔的前景。4-HPR的活性涉及多个生物学靶标，导致该分子可能用于治疗不同的病理学。然而，尽管4-HPR在药理学方面显示出了很好理解的多靶点混杂性，但解释其确切的生理作用仍然具有挑战性。此外，尽管体外试验结果令人满意，到目前为止，4-HPR作为化学治疗剂的临床疗效尚不令人满意。本文中，我们描述了4-HPR类似物文库的制备，然后对其抗癌和抗肥胖/糖尿病特性进行了生物学评估。点击型类似物3b在分化过程中显示出良好的能力来减少3T3-L1脂肪细胞中脂质的积累。此外，在乳腺癌细胞系MCF-7的细胞活力测试中，IC ₅₀为0.53±0.8μM，并且对非癌性HEK293细胞具有良好的选择性（SI = 121）。因此，图3b被选为潜在的PET示踪剂以研究类视黄醇体内，和[放射合成¹⁸ F]图3b开发成功。不幸的是，事实证明[ ¹⁸ F] 3b的稳定性不足以进行成像研究。