Measurements by magnetic resonance imaging (MRI) of the spin-spin (T2), spin-lattice (T1) and spin-density (M0) parameters of water protons, optimized by using the Cramér-Rao Lower Bound (CRLB) theory, were made to quantify the effect of surgically induced osteoarthritis on rat knee cartilage at 4.7 T. Partial meniscectomy was performed on the right medial condyle of four Sprague Dawley rats, leaving the left medial condyle as a control. The animals were euthanized 3 weeks after the operation; the entire limbs were removed and T2 and T1 relaxation measurements and M0 measurements of the protons of water were obtained using conventional Carr-Purcell-Meiboom-Gill (CPMG) and saturation recovery methods. M0 was normalized with respect to a water phantom, to obtain the relative spin-density M0%. Weight-bearing cartilage areas on the meniscectomized medial condyles exhibited a significant increase of T2 relaxation time (p < 0.001) and of M0% (p < 0.01) with respect to the control; T1 relaxation times did not show any statistically significant changes. CRLB-based sampling optimization offered an insight to improved measurement precision and a reduction of scanning time against conventional sampling methods methods. Quantitative MRI assessment of the meniscectomized rat knee shows that cartilage exhibits changes in T2 and M0 values 3 weeks after operation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.mri.2004.02.010 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Co-delivery of IL-1Ra and SOX9 via AAV inhibits inflammation and promotes cartilage repair in surgically induced osteoarthritis animal models.
Gene Ther
January 2025
School of Pharmacy, East China University of Science and Technology, Shanghai, China.
Osteoarthritis (OA), a prevalent joint disorder, can lead to disability, with no effective treatment available. Interleukin-1 (IL-1) plays a crucial role in the progression of OA, and its receptor antagonist (IL-1Ra), a natural IL-1 inhibitor, represents a promising therapeutic target by obstructing the IL-1 signaling pathway. This study delivered IL-1Ra via adeno-associated virus (AAV), a gene therapy vector enabling long-term protein expression, to treat knee osteoarthritis (KOA) in animal models.
View Article and Find Full Text PDFFetal Cartilage Progenitor Cells in the Repair of Osteochondral Defects.
JB JS Open Access
January 2025
Gluck Equine Research Center, Department of Veterinary Science, Martin-Gatton College of Agriculture, Food and Environment, University of Kentucky, Lexington, Kentucky.
Background: Therapies for cartilage restoration are of great interest, but current options provide limited results. In salamanders, interzone (IZN) tissue can regenerate large joint lesions. The mammalian homolog to this tissue exists during fetal development and exhibits remarkable chondrogenesis in vitro.
View Article and Find Full Text PDFIntra-articular injection of inorganic pyrophosphate improves IL-1β-induced cartilage damage in rat model of knee osteoarthritis in vivo.
Osteoarthr Cartil Open
March 2025
Université de Lorraine, CNRS (French National Centre for Scientific Research), IMoPA (Molecular Engineering and Articular Physiopathology), F-54000, Nancy, France.
Objective: Osteoarthritis (OA) is the most common form of chronic joint disease, affecting mainly the elderly population. This disorder is caused by cartilage degeneration with complex changes in the chondrocyte phenotype. Inorganic pyrophosphate (PPi) was shown to counteract the detrimental effect of interleukin (IL)-1β challenging in an in vitro OA model based on rat articular chondrocytes.
View Article and Find Full Text PDF[Mechanism of action of Zhengqing Fengtongning Sustained-release Tablets for treatment of knee osteoarthritis based on metabolomics and intestinal flora].
Zhongguo Zhong Yao Za Zhi
December 2024
Hunan University of Chinese Medicine Changsha 410208, China Hunan Academy of Chinese Medicine Changsha 410013, China.
In order to elucidate the therapeutic effect and mechanism of action of Zhengqing Fengtongning Sustained-release Tablets on knee osteoarthritis, this study created a knee osteoarthritis model using 0.2 mL 40 g·L~(-1) papain and randomly divided the rats into the model group, high-dose and low-dose groups of Zhengqing Fengtongning Sustained-release Tablets, and celecoxib group. All groups were given the drug for four weeks, with the diameter of their knee joint being measured during this period.
View Article and Find Full Text PDF1,25(OH)D induces chondrocyte autophagy and reduces the loss of proteoglycans in osteoarthritis through inhibiting the NF-κB pathway.
Clin Rheumatol
January 2025
Department of Rheumatology and Immunology, Arthritis Research Institute, The First Affiliated Hospital of Anhui Medical University, Hefei, 230000, China.
Objective: Nuclear transcription factor-κB (NF-κB) activation is a pivotal event in the pathogenesis of osteoarthritis (OA). OA patients frequently exhibit vitamin D (VD) deficiency, which is commonly associated with NF-κB activation. Our study aimed to investigate whether VD could protect against OA by modulating NF-κB pathway and to explore the underlying mechanisms.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!