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AC 261066 is an agonist of retinoic acid receptor subtype β isoform 2 (RARβ2) [1] [2]. It is also called UVI2062 [3]. AC 261066 exhibited good oral bioavailability in rats (Foral= 52%) [4]. The IC50 of AC 261066 to AKR1B10 is 51 ± 7μM. No inhibition of AC 261066 to AKR1B1 was detected when using up to 100 μM AC 261066 in the enzymatic assay [3].

Retinoic acid receptors (RARs, subtypes α, β, γ) form heterodimeric complexes with retinoid X receptors (RXR α, β, γ) to orchestrate complex events, such as organ homoeostasis, immune function, development and reproduction [1]. RARβ2 is an isoform of subtype β of retinoic acid receptor, its affinity to retinoids and biological functions are different from other isoforms [2].

AC 261066 did not induce the cell adhesion of RPMI 8866 B cells to the ADAM28 disintegrin-like domain and did not block the atRA-induced adhesion [5].

AC 261066-treatment significantly inhibited the tail regeneration process in N. viridescens compared to DMSO controls. When these AC 261066-treated newts were removed from AC 261066 at 21 days (time of analysis) and then placed back into normal pond water, tail regeneration commenced. Five weeks after removal from the AC 26l066, the tail had regenerated, albeit with an alteration in the dorsal-ventral patterning compared to a normal tail regenerate [6].

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