A Bis(Aquated) Mn(II)-Based MRI Contrast Agent with a Rigid Hydroquinazoline Unit: Synthesis, Characterization, and in Vivo MR Imaging Study

0584487 - ÚOCHB 2025 RIV US eng J - Článek v odborném periodiku
Mallik, R. - Saha, M. - Sarmah, Amrit - Singh, V. - Mohan, H. - Bhat, P. - Kumaran, S. S. - Mukherjee, C.
A Bis(Aquated) Mn(II)-Based MRI Contrast Agent with a Rigid Hydroquinazoline Unit: Synthesis, Characterization, and in Vivo MR Imaging Study.
ACS Applied Bio Materials. Roč. 7, č. 3 (2024), s. 1831-1841. E-ISSN 2576-6422
Institucionální podpora: RVO:61388963
Klíčová slova: magnetic resonance imaging * MRI contrast agent * manganese(II) complex * rigid complex * blood pool contrast agent * bis (aquated) * lipophilicity * serum albumin affinity
Impakt faktor: 4.7, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1021/acsabm.3c01236

Since the finding of nephrogenic systemic fibrosis (NFS) in patients with renal impairment and the long-term accumulation of Gd(III) ions in the central nervous system, the search for nongadolinium ion-based MRI contrast agents made of nutrient metal ions has drawn paramount attention. In this context, the development of Mn(II)-based MRI contrast agents has been a subject of interest for the last few decades. Herein, we report a pentadentate ligand (Li2[BenzPic2]) composed of two picolinate moieties and a rigid 1,2,3,4-tetrahydroquinazoline unit and the corresponding bis(aquated) Mn(II) complex (Complex 1). The complex exhibited high thermodynamic stability (log Kcond = 11.62) and kinetic inertness similar to that of the clinically approved Gd(III)-based contrast agent Magnevist. Complex 1 exerted longitudinal relaxivity (r1) of 5.32 mM-1 s-1 at 1.41 T, 37 °C, pH 7.4, and it increased by 3.6-fold in the presence of serum albumin protein, confirming a substantial rigidifying interaction (albumin association constant KA = 1.66 * 103 M-1) between the protein and the amphiphilic (log P =0.45) contrast agent. An intravenous dose of 0.08 mmol/kg in a healthy mouse, excellent MRI signal intensity enhancement in the vasculature of the mouse liver, and brightened images of the gallbladder, kidney, and liver were realized.
Trvalý link: https://hdl.handle.net/11104/0352401