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Chemical Structure| 137076-54-1 Chemical Structure| 137076-54-1

Structure of DOTA-tri(t-butyl ester)
CAS No.: 137076-54-1

Chemical Structure| 137076-54-1

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Ajay Kumar Sharma ; Kuldeep Gupta ; Akhilesh Mishra ; Gabriela Lofland ; Ian Marsh ; Dhiraj Kumar , et al.

Abstract: The limited availability of molecularly targeted low-molecular-weight imaging agents for monitoring multiple myeloma (MM)-targeted therapies has been a significant challenge in the field. In response, a first-in-class peptide-based radiotracer, [68Ga]Ga-AJ206, is developed that can be seamlessly integrated into the standard clinical workflow and is specifically designed to noninvasively quantify levels and pharmacodynamics by positron emission tomography (PET). A bicyclic , AJ206, is synthesized and exhibits high affinity to (KD: 19.1 ± 0.99 × 10−9 m) by surface plasmon resonance. Further, [68Ga]Ga-AJ206-PET shows high contrast within 60 min and suitable absorbed dose estimates for clinical use. Additionally, [68Ga]Ga-AJ206 detects expression in cell line-derived xenografts, patient-derived xenografts (PDXs), and disseminated disease models in a manner consistent with flow cytometry and immunohistochemistry findings. Moreover, [68Ga]Ga-AJ206-PET successfully quantifies pharmacodynamics in PDXs, revealing increased expression in the tumor following all-trans (ATRA) therapy. In conclusion, [68Ga]Ga-AJ206 exhibits the salient features required for clinical translation, providing CD38-specific high-contrast images in multiple models of MM. [68Ga]Ga-AJ206-PET could be useful for quantifying total levels and pharmacodynamics during therapy to evaluate approved and new therapies in MM and other diseases with involvement.

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Astrid Haraldsson ;

Abstract: One of the major challenges in cancer treatment is delivering high enough doses of active substance specifically to cancer cells without accumulation in healthy organs. Pretargeting has emerged as a potential solution, where the delivery of a cancer recognizing (primary) agent and a cancer killing (secondary) agent are separated. Pretargeted cancer therapy utilizing PNA probes has proved to be a promising approach to selectively deliver toxic payloads to cancer cells while minimizing accumulation in healthy organs. The aim of this project was to develop a new set of secondary PNA probes specifically designed for PNA pretargeted delivery of cytotoxic drugs. A HER2-specific Affibody molecule, ZHER2:2891-SR-H6, was recombinantly produced in E. coli before being conjugated to a primary PNA hybridization probe, HP9, through sortase A-mediated ligation, to produce the primary agent, ZHER2:2891-SR-HP9. Circular dichroism (CD) spectroscopy confirmed the stability of the constructs with high melting temperatures of 71.2 and 73.7 °C. Surface plasmon resonance (SPR) analysis demonstrated high binding affinity to HER2, slightly affected by PNA conjugation. Three new secondary PNA hybridization probes were designed, differing mainly in prevalence and position of a hydrophilic PEG molecule. The probes were produced by solid phase peptide synthesis and conjugated to the cytotoxic drug DM1 through maleimide-cysteine coupling. Analytical RP-HPLC evaluation revealed a slightly higher apparent hydrophobicity for the probe with PEG in the main chain. All three secondary probes displayed high affinity to the primary probe with KD values between 498–505 pM. In vitro cytotoxicity studies on HER2-overexpressing cells demonstrated comparable potent cytotoxic activity for pre-incubated primary and secondary probes with IC50 values of 10–14 nM. These results indicate the successful development of three PNA-drug conjugates for pretargeted delivery of cytotoxic drugs.

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Product Details of DOTA-tri(t-butyl ester)

CAS No. :137076-54-1
Formula : C28H52N4O8
M.W : 572.73
SMILES Code : O=C(O)CN1CCN(CC(OC(C)(C)C)=O)CCN(CC(OC(C)(C)C)=O)CCN(CC(OC(C)(C)C)=O)CC1
MDL No. :MFCD02259697
InChI Key :RVUXZXMKYMSWOM-UHFFFAOYSA-N
Pubchem ID :11606627

Safety of DOTA-tri(t-butyl ester)

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H315-H319-H335
Precautionary Statements:P261-P305+P351+P338

Isoform Comparison

Protocol

Bio Calculators
Preparing Stock Solutions 1mg 5mg 10mg

1 mM

5 mM

10 mM

1.75mL

0.35mL

0.17mL

8.73mL

1.75mL

0.87mL

17.46mL

3.49mL

1.75mL

Dissolving Methods
Please choose the appropriate dissolution scheme according to your animal administration guide.For the following dissolution schemes, clear stock solution should be prepared according to in vitro experiments, and then cosolvent should be added in turn:

in order to ensure the reliability of the experimental results, the clarified stock solution can be properly preserved according to the storage conditions; The working fluid for in vivo experiment is recommended to be prepared now and used on the same day;

The percentage shown in front of the following solvent refers to the volume ratio of the solvent in the final solution; If precipitation or precipitation occurs in the preparation process, it can be assisted by heating and/or ultrasound.
Protocol 1
Protocol 2
 

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