Anti-PDPN monoclonal antibody, clone 4D5aE5E6

BackgroundSpinal cord stimulation (SCS) has been shown to provide pain relief in painful diabetic polyneuropathy (PDPN). As the vasculature system plays a great role in the pathophysiology of PDPN, a potential beneficial side-effect of SCS is peripheral vasodilation, with high frequency (HF) SCS in particular. We hypothesize that HF-SCS (500Hz), compared with conventional (CON) or low frequency (LF)-SCS will result in increased alleviation of mechanical hypersensitivity in chronic experimental PDPN. MethodsDiabetes was induced in 8-week-old female Sprague-Dawley rats with an intraperitoneal injection of 65mg/kg of streptozotocin (n=44). Rats with a significant decrease in mechanical withdrawal response to von Frey filaments over a period of 20weeks were implanted with SCS electrodes (n=18). Rats were assigned to a cross-over design with a random order of LF-, CON-, HF- and sham SCS and mechanical withdrawal thresholds were assessed with von Frey testing. ResultsCompared with sham treatment, the average 50% WT score for 5Hz was 4.88g higher during stimulation (p=0.156), and 1.77g higher post-stimulation (p=0.008). CON-SCS resulted in 50% WT scores 5.7g, and 2.51g higher during (p=0.064) and after stimulation (p<0.004), respectively. HF-SCS started out with an average difference in 50% WT score compared with sham of 1.87g during stimulation (p=0.279), and subsequently the steepest rise to a difference of 5.47g post-stimulation (p<0.001). ConclusionsWe demonstrated a delayed effect of HF-SCS on mechanical hypersensitivity in chronic PDPN animals compared with LF-, or CON-SCS. SignificanceThis study evaluates the effect of SCS frequency (5-500Hz) on mechanical hypersensitivity in the chronic phase of experimental PDPN. High frequency (500Hz) - SCS resulted in a delayed effect- on pain-related behavioural outcome in chronic PDPN.

VEGF and podoplanin (PDPN) have been identified as angiogenesis and/or lymphangiogenesis regulators and might be essential to restrict tumor growth, progression, and metastasis. In the present study, we evaluate the association between the expression of these markers and CIN grade. Immunohistochemistry was performed in 234 uterine cervical samples using conventional histologic sections or TMA with the monoclonal antibodies to VEGF (C-1 clone) and podoplanin (D2-40 clone). Positive-staining rates of VEGF in 191 CIN specimens were significantly associated with histological grade (P < 0.001). Negative and/or focal immunostaining for PDPN were more frequent in CIN 3 (P = 0.016). We found that patients with CIN 3 more frequently had strong and more diffuse staining for VEGF and diminished staining for PDPN (P = 0.018). Strong and more diffuse VEGF immunoexpressions in CIN 2 and CIN 3 were detected when compared to CIN 1. Negative and/or focal PDPN immunoexpression appear to be more frequent in CIN 3. Moderate to strong VEGF expression may be a tendency among patients with high-grade lesions and diminished PDPN expression.