Objetivos: Sintetizar conjugados del acetónido de la uridina con triterpenos (colesterol y 3β-5α,8α-endoperoxido-colest-6-en-3-ol) y ácido succínico como puente. Métodos: Se preparó el acetónido de la uridina en acetona mediante catálisis ácida. Se prepararon los succinatos de los esteroles con anhídrido succínico y catalizador nucleofílico 4-N,N-dimetilamino-piridina (DMAP). Los conjugados 1 y 2 se sintetizaron mediante la esterificación de Steglich, con agente de acoplamiento N,N’-diciclohexilcarbodiimida (DCC)y DMAP. Los compuestos se caracterizaron por espectroscopia de RMN (1H RMN y 13C RMN) y espectrometría de masas. Los derivados se evaluaron sobre líneas celulares de ovario de hámster chino (CHO-K1) y de cáncer de mamá (MCF-7). Resultados: Se obtuvieron derivados conjugados del acetónido de la uridina con dos triterpenos con rendimientos superiores al 80%. Los conjugados de uridina con triterpenos no presentaron inhibición significativa de la viabilidad celular sobre las líneas celulares MCF-7 y CHO-K1, tampoco se evidenció una relación dosis-respuesta para los compuestos evaluados. Conclusiones: El método de esterificación con agentes de acoplamiento permitió obtener conjugados de la uridina con triterpenos empleando el ácido succínico como puente. Sin embargo los derivados de uridina obtenidos no presentaron actividad citotóxica significativa (p<0,05) sobre las líneas celulares evaluadas.
Objectives
Uridine was conjugated with fatty acids to improve the drug lipophilicity and the interaction with phospholipid bilayers.
Methods
The esterification reaction using carbodiimides compounds as coupling agents and a nucleophilic catalyst allowed us to synthesize tri‐acyl ester derivatives of uridine with fatty acids. Analysis of molecular interactions between these tri‐acyl ester derivatives and l‐α‐dimyristoylphosphatidylcholine (DMPC) multilamellar vesicles (MLV) – as a mammalian cell membrane model – have been performed by differential scanning calorimetry (DSC).
Key findings
The DSC thermograms suggest that nucleoside and uridine triacetate softly interact with phospholipidic multilamellar vesicles which are predominantly located between the polar phase, whereas the tri‐acyl ester derivatives with fatty acids (myristic and stearic acids) present a strongly interaction with the DMPC bilayer due to the nucleoside and aliphatic chains parts which are oriented towards the polar and lipophilic phases of the phospholipidic bilayer, respectively. However, the effects caused by the tri‐myristoyl uridine and tri‐stearoyl uridine are different.
Conclusions
We show how the structural changes of uridine modulate the calorimetric behaviour of DMPC shedding light on their affinity with the phospholipidic biomembrane model.
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