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To investigate the feasibility of high‐sensitivity cellular MRI of embryonic stem (ES) cells using a novel cell permeable and cell retentive T₁ contrast agent.

Mouse ES cells were labeled with a novel manganese porphyrin contrast agent, MnAMP, at 0.1 mM over 2 to 24 h and retained in contrast‐free medium for up to 24 h postlabeling. MRI was performed on a 3 Tesla clinical scanner; T₁ and T₂ relaxation times were measured. Quantification of manganese content was performed using atomic absorption spectroscopy. Viability and proliferation assays were done for the longest labeling interval. Differentiation capacity was assessed using the hanging drop method to direct differentiation toward cardiomyocytes.

MnAMP‐labeled ES cells exhibited over a fourfold decrease in T₁ compared with unlabeled cells, and maintained up to a threefold decrease 24 h postlabeling …