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J Med Chem ; 67(10): 8261-8270, 2024 May 23.
Artículo en Inglés | MEDLINE | ID: mdl-38690886

RESUMEN

This study aimed to develop a novel radiotracer using trastuzumab and the long-lived [52Mn]Mn isotope for HER2-targeted therapy selection and monitoring. A new Mn(II) chelator, BPPA, synthesized from a rigid bispyclen platform possessing a picolinate pendant arm, formed a stable and inert Mn(II) complex with favorable relaxation properties. BPPA was converted into a bifunctional chelator (BFC), conjugated to trastuzumab, and labeled with [52Mn]Mn isotope. In comparison to DOTA-GA-trastuzumab, the BPPA-trastuzumab conjugate exhibits a labeling efficiency with [52Mn]Mn approximately 2 orders of magnitude higher. In female CB17 SCID mice bearing 4T1 (HER2-) and MDA-MB-HER2+ (HER2+) xenografts, [52Mn]Mn-BPPA-trastuzumab demonstrated superior uptake in HER2+ cells on day 3, with a 3-4 fold difference observed on day 7. Overall, the hexadentate BPPA chelator proves to be exceptional in binding Mn(II). Upon coupling with trastuzumab as a BFC ligand, it becomes an excellent imaging probe for HER2-positive tumors. [52Mn]Mn-BPPA-trastuzumab enables an extended imaging time window and earlier detection of HER2-positive tumors with superior tumor-to-background contrast.


Asunto(s)
Manganeso , Ratones SCID , Tomografía de Emisión de Positrones , Receptor ErbB-2 , Trastuzumab , Animales , Femenino , Ratones , Línea Celular Tumoral , Quelantes/química , Quelantes/síntesis química , Manganeso/química , Manganeso/metabolismo , Ratones Endogámicos BALB C , Ácidos Picolínicos/química , Tomografía de Emisión de Positrones/métodos , Radiofármacos/química , Radiofármacos/síntesis química , Radiofármacos/farmacocinética , Receptor ErbB-2/metabolismo , Distribución Tisular , Trastuzumab/química
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