ST12
Instructions for Use
Product information
ST12 is a lipid-conjugated DMXAA prodrug designed for temporally controlled STING activation in mRNA vaccine formulations. Its structure integrates a mouse-specific STING agonist, a biodegradable ester linker, an RNA-interacting tertiary amine domain, and two hydrophobic tails. When incorporated as a partial replacement for SM-102, ST12 preserves early antigen mRNA translation and subsequently releases DMXAA to activate STING. This delayed activation supports localized type I interferon signaling, enhanced antigen-specific CD8-positive T-cell responses, and improved antitumor immunity. In preclinical OVA and HPV tumor models, ST12-based Syn-STING vaccines suppressed tumor growth and prolonged survival. ST12 remains a preclinical research lipid developed specifically around DMXAA-sensitive STING systems.
| CAS No. | Not available |
| Chemical Name | ST12 |
| Formula | Not available |
| M.Wt | Not available |
| Purity | 98% |
| Storage | Original product: up to 1 year under the storage conditions stated on the vial, kept tightly sealed. Stock solutions: aliquots at -20°C, generally up to one month. |
| Shipping condition | Ships from Shanghai. Pure lipid is stable during ice-pack transport. |
Formulation & study context
Literature information refers to the cited study and its particular formulation. Administration routes are research context, not clinical instructions or a guarantee of performance.
A complete product-specific formulation has not been verified. No standard ratio is substituted.
| N/P ratio | Not reported in the verified record |
| Cargo | Not available in the verified record |
| Administration route | Not available in the verified record |
| Animal model | Not available in the verified record |
| Formulation process | Not available in the verified record |
N/P is the molar ratio of specified lipid nitrogen groups to nucleic-acid phosphate groups. A lipid:cargo mass ratio is a different quantity and must not be used as N/P.
Stock-solution preparation table
Calculated from the product-page molecular weight: not available g/mol. Volumes are final solution volumes.
| Lipid mass | 1 mM | 5 mM | 10 mM |
|---|---|---|---|
| 10 mg | MW unavailable | MW unavailable | MW unavailable |
| 25 mg | MW unavailable | MW unavailable | MW unavailable |
| 50 mg | MW unavailable | MW unavailable | MW unavailable |
| 100 mg | MW unavailable | MW unavailable | MW unavailable |
| 250 mg | MW unavailable | MW unavailable | MW unavailable |
Volume (mL) = mass (mg) × 1000 / [MW (g/mol) × concentration (mM)]. These are mathematical conversions, not measured solubility or validated solvent recommendations. Confirm solvent compatibility and the molecular weight of the exact material before use.
Open editable solution calculators →Handling & storage
Provided that storage conditions are as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 1 year.
Wherever possible, prepare and use solutions on the same day. If stock solutions must be prepared in advance, store them as aliquots in tightly sealed vials at -20°C. Generally, these will be usable for up to one month.
Before use, and prior to opening the vial, allow the product to equilibrate to room temperature for at least 1 hour.
References
Qin P, Qin Q, Hao Y, et al. Enhanced antitumor immunity of mRNA vaccines by bioorthogonal-like delayed activation of exogeneous STING. Nature Biotechnology. 2026.