scholarly journals Effects of lysosomal collagenolytic enzymes, anti-inflammatory drugs and other substances on some properties of insoluble collagen

1969 ◽  
Vol 113 (3) ◽  
pp. 457-463 ◽  
Author(s):  
A. J. Anderson
Keyword(s):  
Rheumatoid Arthritis ◽  
Electrostatic Interactions ◽  
Enzyme System ◽  
Maximum Activity ◽  
Thiol Compounds ◽  
Insoluble Collagen ◽  
Other Substances ◽  
Inflammatory Drugs ◽  
Anti Inflammatory

1. An enzyme system present in a rat liver lysosome-rich fraction was found to liberate soluble hydroxyproline-containing products from insoluble collagen, with maximum activity at pH3·45. It was concluded that a form of cathepsin D was involved since synthetic substrates specific for trypsin were not hydrolysed. Collagenolysis was enhanced by thiol compounds and inhibited by Cu2+ ions and the anti-inflammatory drugs phenylbutazone and ibufenac. 2. The possibility that behaviour of collagen and collagenolysis were modified by various substances, either by destruction of intramolecular and intermolecular bonds in tropocollagen or by electrostatic interactions, is discussed. Insoluble collagen was found to bind electrostatically to chondromucoprotein. This interaction was inhibited by some anti-inflammatory drugs. 3. Possible roles of the lysosomal collagenolytic enzyme system in experimental lathyrism in rats given penicillamine, and in erosion of cartilage in rheumatoid arthritis, are considered. 4. Collagenolysis in vivo, which may depend on complex interrelationships between collagen, chondromucoprotein and metal ions, is discussed in relation to possible effects, both harmful and beneficial, of anti-inflammatory drugs used in rheumatoid arthritis.

In vitro and in vivo synergistic interactions between the flavonoid rutin with paracetamol and non-steroidal anti-inflammatory drugs

2021 ◽  
Author(s):  
Juan Ramón Zapata-Morales ◽  
Angel Josabad Alonso-Castro ◽  
Gloria Sarahí Muñoz-Martínez ◽  
María Mayela Martínez-Rodríguez ◽  
Mónica Esther Nambo-Arcos ◽  
...  
Keyword(s):  
Synergistic Interactions ◽  
Inflammatory Drugs ◽  
Anti Inflammatory

scholarly journals Capsaicin-Sensitive Peptidergic Sensory Nerves Are Anti-Inflammatory Gatekeepers in the Hyperacute Phase of a Mouse Rheumatoid Arthritis Model

2021 ◽  
Vol 22 (4) ◽  
pp. 1682
Author(s):  
Bálint Botz ◽  
Gábor Kriszta ◽  
Kata Bölcskei ◽  
Ádám István Horváth ◽  
Attila Mócsai ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Morphological Changes ◽  
Vascular Leakage ◽  
Sensory Nerves ◽  
Clinical Severity ◽  
Severity Scores ◽  
Clinical Scoring ◽  
Anti Inflammatory ◽  
Ros Burst

Capsaicin-sensitive peptidergic sensory nerves play complex, mainly protective regulatory roles in the inflammatory cascade of the joints via neuropeptide mediators, but the mechanisms of the hyperacute arthritis phase has not been investigated. Therefore, we studied the involvement of these afferents in the early, “black box” period of a rheumatoid arthritis (RA) mouse model. Capsaicin-sensitive fibres were defunctionalized by pretreatment with the ultrapotent capsaicin analog resiniferatoxin and arthritis was induced by K/BxN arthritogenic serum. Disease severity was assessed by clinical scoring, reactive oxygen species (ROS) burst by chemiluminescent, vascular permeability by fluorescent in vivo imaging. Contrast-enhanced magnetic resonance imaging was used to correlate the functional and morphological changes. After sensory desensitization, both early phase ROS-burst and vascular leakage were significantly enhanced, which was later followed by the increased clinical severity scores. Furthermore, the early vascular leakage and ROS-burst were found to be good predictors of later arthritis severity. We conclude that the anti-inflammatory role of peptidergic afferents depends on their activity in the hyperacute phase, characterized by decreased cellular and vascular inflammatory components presumably via anti-inflammatory neuropeptide release. Therefore, these fibres might serve as important gatekeepers in RA.

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