It was suggested that one should include assessment of blood and joint fluid for nitrogen oxide, nitrate diaphorase and nitrate reductase in the algorithm of investigation and dynamic observation, choice of tactics and therapy efficiency assessment.
In particular, we applied two different plant-resource uptake models to determine which of these provided the best explanation of the joint plant population-nitrogen cycle dynamics: saturating uptake and linear uptake (see Table S1).
In univariate analysis, arterial wall thickening among RA patients was identified to be positively associated with age, BMI, triglyceride levels, number of tender joints and blood urea nitrogen (BUN) levels, and negatively associated with cyclosporine treatment, CRP levels and number of platelets/mm.
Frozen ankle joints were pulverized in liquid nitrogen using a mortar and pestle, and total RNA was isolated from individual homogenized joints (four or five animals/group) using RNeasy® Mini-kits (Qiagen Ltd ,Crawley, UK), following the manufacturer's instructions.
The frozen joints were ground under liquid nitrogen with mortar and pestle.
The frozen joint tissues were pulverized in liquid nitrogen, and total protein extracts from the ankle joints were isolated from individual homogenized joints in lysis buffer (mammalian protein extraction reagent; Pierce Biotechnology, Rockford, IL, USA) containing Protease Inhibitor Cocktail (Calbiochem/EMD Millipore, Billerica, MA, USA).
After removal of the skin and muscle, portions of the leg containing the knee, ankle, and finger joints were rapidly frozen in liquid nitrogen.
Knee joints were obtained, frozen in liquid nitrogen and homogenized in 0.5 ml ice-cold 20 mM Hepes buffer supplemented with 1 mM dithiothreitol, 0.1% v/v Triton and a protease inhibitor cocktail.
Ankle joints were snap frozen in liquid nitrogen and homogenised in Qiagen RLT plus buffer (Qiagen, Crawley, UK) using Precellys24 ceramic bead homogenisation technology (Bertin Technologies, Montigny-le-Bretonneux, France).
Synovial tissue was taken at the time of joint replacement and snap frozen in liquid nitrogen.
