Here we report that the maintenance of eCB-LTD does not involve Selleck EPZ004777 presynaptic K+ channels: eCB-LTD was not affected by blockade of K+ channels with 4-AP (100 mu M) and BaCl2
(300 mu M) (fEPSP = 78.9 +/- 5.4% of baseline 58-60 min after tetanus, compared to 78.9 +/- 5.9% in control slices). In contrast, eCB-LTD was blocked by treatment of the slices with the adenylyl cyclase (AC) activator forskolin (10 mu M), and with the protein kinase A (PKA) inhibitor KT5720 (1 mu M) (fEPSP = 108.9 +/- 5.7% in forskolin and 110.5 +/- 7.7% in KT5720, compared to 80.6 +/- 3.9% in control conditions). Additionally, selective blockade of P/Q-type Ca2+ channels with omega-agatoxin-IVA (200 nM) occluded the expression of eCB-LTD (fEPSP = 113.4 +/- 15.9% compared to 78.6 +/- 4.4% in control slices), while blockade of N- with omega-conotoxin-GVIA (1 mu M) or L-type Ca2+ channels with nimodipine, (1 mu M), was without effect (fEPSP was 83.7 +/- 5.3% and 87 +/- 8.9% respectively). These data show that protracted inhibition of AC/PKA activity and P/Q-type Ca2+ channels
are necessary for expression of eCB-LTD at NAc synapses. (c) 2007 Elsevier Ltd. All rights reserved.”
“Objective: To compare late patency after direct and crossover bypass in good-risk patients with unilateral iliac occlusive disease not amenable to angioplasty.
Methods. Between May 1986 and March 1991, 143 patients with unilateral iliac artery occlusive disease and disabling claudication Poziotinib in vitro were randomized into two surgical treatment groups, ie, crossover bypass (n = 74) or
direct bypass (n = 69). The OTX015 size of the patient population was calculated to allow detection of a possible 20% difference in patency in favor of direct bypass with a one-sided alpha risk of 0.05 and a beta risk of 0.10. Patients underwent yearly follow-up examinations using color flow duplex scanning with ankle-brachial systolic pressure index measurement. Digital angiography was performed if hemodynamic abnormalities were noted. Median follow-up was 7.4 years. Primary endpoints were primary patency and assisted primary patency estimated by the Kaplan-Meier method with 95% confidence interval. Secondary endpoints were secondary patency and postoperative mortality and morbidity.
Results. Cardiovascular risk factors, preoperative symptoms, iliac lesions TASC class (C in 87 [61%] patients and D in 56 [39%] patients), and superficial femoral artery (SFA) run-off were comparable in the two treatment groups. One patient in the direct bypass group died postoperatively. Primary patency at 5 years was higher in the direct bypass group than in the crossover bypass group (92.7 +/- 6.1% vs 73.2 +/- 10%, P = .001). Assisted primary patency and secondary patency at 5 years were also higher after direct bypass than crossover bypass (92.7 +/- 6.1% vs 84.3 +/- 8.5%, P = .04 and 97.0 +/- 3.0% vs 89.8 +/- 7.1%, P = .03, respectively).