A kind of osteoarthritis cartilage targeting gadolinium-based magnetic resonance imaging contrast agent and preparation method thereof
A magnetic resonance imaging, osteoarthritis technology, applied in pharmaceutical formulations, preparations for in vivo experiments, drug delivery, etc., to achieve cartilage-specific targeting and MRI imaging, good in vitro chondrocyte targeting ability, improve biological Compatibility effect
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[0041] In another typical embodiment of the present invention, a method for preparing the aforementioned cartilage-targeted gadolinium-based magnetic resonance imaging contrast agent for osteoarthritis is provided, the preparation method comprising the following steps:
[0042] (1) Gd 2 (CO 3 ) 3 Nanoparticles were dispersed in Tris-HCl buffer solution, dropped into dopamine solution, stirred, and then centrifuged to obtain Gd coated with dopamine shell on the surface 2 (CO 3 ) 3 Nanoparticles, i.e. Gd 2 (CO 3 ) 3 @PDA nanoparticles;
[0043] (2) with step (1) gained Gd 2 (CO 3 ) 3 @PDA nanoparticles dispersed in deionized water, adding NH 2 -mPEG-SH, stirred, and then centrifuged to obtain Gd modified with polyethylene glycol on the surface of the dopamine shell 2 (CO 3 ) 3 Nanoparticles, i.e. Gd 2 (CO 3 ) 3 @PDA-PEG nanoparticles;
[0044] (3) The cartilage-targeting polypeptide whose amino acid sequence is DWRVIIPPRPSA is connected to the Gd obtained in st...
Embodiment 1
[0051] A method for preparing a cartilage-targeted gadolinium-based magnetic resonance imaging contrast agent for osteoarthritis according to an embodiment of the present invention, comprising the following steps:
[0052] (1) Synthesis of Gd 2 (CO 3 ) 3 nanoparticles
[0053] 0.5mM GdCl 3 ·6H 2 O and 2.7g of urea were dissolved in 35mL of deionized water, stirred and reacted at 80°C; during the reaction, the color of the system changed from colorless to milk-like color; min, separated to get Gd 2 (CO 3 ) 3 nanoparticles;
[0054] (2) Synthesis of Gd 2 (CO 3 ) 3 @PDA nanoparticles
[0055] The 2mg / mL Gd obtained by synthesis of the above step (1) 2 (CO 3 ) 3Nanoparticles were dispersed in 30mL of 10mM Tris-HCl (pH=8.5), and 5mL of dopamine solution (2mg / mL) was dripped clockwise, and the system was stirred overnight to obtain a black solution; Gd was separated by high-speed centrifugation (10000rpm) for 10 minutes. 2 (CO 3 ) 3 @PDA nanoparticles;
[0056] (3...
Embodiment 2
[0074] A method for preparing a cartilage-targeted gadolinium-based magnetic resonance imaging contrast agent for osteoarthritis according to an embodiment of the present invention, comprising the following steps:
[0075] (1) Synthesis of Gd 2 (CO 3 ) 3 nanoparticles
[0076] 0.5mM GdCl 3 ·6H 2 O and 2.7g of urea were dissolved in 35mL of deionized water, stirred and reacted at 80°C; during the reaction, the color of the system changed from colorless to milk-like color; after 2 hours of reaction, the milk-like nanoparticles were centrifuged at a high speed (12000rpm) for 10 min, separated to get Gd 2 (CO 3 ) 3 nanoparticles;
[0077] (2) Synthesis of Gd 2 (CO 3 ) 3 @PDA nanoparticles
[0078] The 2mg / mL Gd obtained by synthesis of the above step (1) 2 (CO 3 ) 3 Nanoparticles were dispersed in 30mL of 10mM Tris-HCl (pH=8.5), and 5mL of dopamine solution (2mg / mL) was dripped clockwise, and the system was stirred overnight to obtain a black solution; Gd was separa...
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