Ritlecitinib (PF-06651600) is an orally active and selectiveJAK3inhibitor with anIC₅₀of 33.1 nM^[1].

Ritlecitinib is a potent JAK3-selective inhibitor which can inhibit the JAK3 kinase activity with an IC₅₀of 33.1 nM but without activity (IC₅₀>10 000 nM) against JAK1, JAK2, and TYK2. Ritlecitinib inhibits the phosphorylation of STAT5 elicited by IL-2, IL-4, IL-7, and IL-15 with IC₅₀values of 244, 340, 407, and 266 nM, respectively. Ritlecitinib also inhibits the phosphorylation of STAT3 elicited by IL-21 with an IC₅₀of 355 nM. Functional assessment in T-cell differentiation assays demonstrate that Ritlecitinib suppresses Th1 and Th17 differentiation as measured by IFNγ, after 5 days under Th1 conditions, and IL-17 production, after 6 days under Th17 conditions, with IC₅₀values of 30 nM and 167 nM, respectively. Ritlecitinib also suppresses Th1 and Th17 function as measured by the inhibition of IFNγ production (IC₅₀=48 nM) and IL-17 production (IC₅₀=269 nM) in cells that have been previously differentiated and rested before being treated with PF-06651600^[1].

In the rat adjuvant-induced arthritis (AIA) model, Ritlecitinib reduces paw swelling with an unbound EC₅₀of 169 nM. Similarly, Ritlecitinib significantly reduces disease severity in the experimental autoimmune encephalomyelitis (EAE) mouse model when dosed either therapeutically at 30 or 100 mg/kg or prophylactically at 20 and 60 mg/kg. The efficacy of Ritlecitinib in these two rodent models of inflammatory and autoimmune diseases illustrates that JAK3-selective inhibition can be sufficient to have disease modifying effects in human diseases^[1].

285.34

Solid

C₁₅H₁₉N₅O

1792180-81-4

Room temperature in continental US; may vary elsewhere.

DMSO : 125 mg/mL(438.07 mM;Need ultrasonic)

H₂O : 6.67 mg/mL(23.38 mM;Need ultrasonic)

请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。
储备液的保存方式和期限：-80℃, 6 months; -20℃, 1 month。-80℃ 储存时，请在 6 个月内使用，-20℃ 储存时，请在 1 个月内使用。

请根据您的实验动物和给药方式选择适当的溶解方案。以下溶解方案都请先按照In Vitro方式配制澄清的储备液，再依次添加助溶剂：

——为保证实验结果的可靠性，澄清的储备液可以根据储存条件，适当保存；体内实验的工作液，建议您现用现配，当天使用； 以下溶剂前显示的百
分比是指该溶剂在您配制终溶液中的体积占比；如在配制过程中出现沉淀、析出现象，可以通过加热和/或超声的方式助溶

• 1.

  请依序添加每种溶剂： 0.5% MC  0.5%Tween-80

  Solubility: 6.67 mg/mL (23.38 mM); Suspended solution; Need ultrasonic
• 2.

  请依序添加每种溶剂： 10% DMSO    40%PEG300   5%Tween-80   45% saline

  Solubility: ≥ 2.08 mg/mL (7.29 mM); Clear solution

  此方案可获得 ≥ 2.08 mg/mL (7.29 mM，饱和度未知) 的澄清溶液。

  以 1 mL 工作液为例，取 100 μL 20.8 mg/mL 的澄清 DMSO 储备液加到 400 μL PEG300 中，混合均匀；向上述体系中加入50 μL Tween-80，混合均匀；然后继续加入 450 μL生理盐水定容至 1 mL。

  将 0.9 g 氯化钠，完全溶解于 100 mL ddH2O 中，得到澄清透明的生理盐水溶液
• 3.

  请依序添加每种溶剂： 10% DMSO    90% (20%SBE-β-CDin saline)

  Solubility: ≥ 2.08 mg/mL (7.29 mM); Clear solution

  此方案可获得 ≥ 2.08 mg/mL (7.29 mM，饱和度未知) 的澄清溶液。

  以 1 mL 工作液为例，取 100 μL 20.8 mg/mL 的澄清 DMSO 储备液加到 900 μL20% 的 SBE-β-CD 生理盐水水溶液中，混合均匀。

  将 2 g 磺丁基醚 β-环糊精加入 5 mL 生理盐水中，再用生理盐水定容至 10 mL，完全溶解，澄清透明
• 4.

  请依序添加每种溶剂： 10% DMSO    90%corn oil

  Solubility: ≥ 2.08 mg/mL (7.29 mM); Clear solution

  此方案可获得 ≥ 2.08 mg/mL (7.29 mM，饱和度未知) 的澄清溶液，此方案不适用于实验周期在半个月以上的实验。

  以 1 mL 工作液为例，取 100 μL 20.8 mg/mL 的澄清 DMSO 储备液加到 900 μL玉米油中，混合均匀。