Impact of Mobilization Strategies on Peripheral Blood Stem Cell Collection Efficiency and Product Quality: A Retrospective Single-Center Study.

Autologous stem cell transplantation is routinely used in the management of several hematological diseases, solid tumors, and immune disorders. Peripheral blood stem cell (PBSC) collection performed by apheresis is the preferred source of stem cells. In this study, the potential impact of mobilization regimens on the performance of the Spectra Optia® continuous mononuclear cell collection system was evaluated. We performed a retrospective data analysis for patients undergoing autologous PBSC collection at the Medical University Vienna, Vienna General Hospital between September 2016 and June 2018. Collections were divided into two main groups according to the mobilization regimen received: without (210 collections) or with (99 collections) plerixafor. Assessed variables included product characteristics and collection efficiency (CE). Overall, product characteristics were similar between the groups. Median CD34+ CE2 was 50.1% versus 53.0%, and CE1 was 66.9% versus 69.9% following mobilization without and with plerixafor, respectively; the difference was not statistically significant. Simple linear regression showed a very weak positive correlation between the mobilization method and CE1 or CE2 (mobilization with plerixafor increased CE2 by 4.106%). In conclusion, the Spectra Optia® apheresis system led to high CE and a good quality of PBSC products when mobilization regimens with or without plerixafor were used.

The effect of vasopressin on choroidal blood flow, intraocular pressure, and orbital venous pressure in rabbits.

PURPOSE: To investigate the effects of arginine-vasopressin (AVP) on intraocular pressure (IOP), orbital venous pressure (OVP), and choroidal blood flow (ChorBF) regulation in anesthetized rabbits. METHODS: Mean arterial pressure (MAP), IOP, and OVP were measured by direct cannulation of the central ear artery, the vitreous, and the orbital venous sinus, respectively. Laser Doppler flowmetry was used to record ChorBF. To change the perfusion pressure (PP), MAP was manipulated mechanically with occluders around the aorta and vena cava. In the first group of animals (n = 11) the dose-response relationship was measured. In the second group of animals (n = 8) pressure-flow relationships were determined at baseline and in response to intravenous application of a low (0.08 ng/kg/min) and a high (1.33 ng/kg/min) infusion rate of AVP. RESULTS: AVP caused a dose-dependent increase of MAP and choroidal vascular resistance (ChorR), whereas IOP, OVP, ChorBF, and heart rate (HR) were decreased. In contrast to the high infusion rate, the low infusion rate of AVP had no effect on baseline ChorBF. However, the pressure-flow relationship was shifted downward significantly by both infusion rates at PP below baseline. CONCLUSIONS: AVP reduces IOP and OVP significantly and is a potent vasoconstrictor in the choroidal vascular bed. In the choroid, the effect of AVP is not only dose-dependent, but also PP-dependent, which is indicated by the reduced perfusion relative to control with low-dosed AVP at low PP.

Mutation in the Scyl1 gene encoding amino-terminal kinase-like protein causes a recessive form of spinocerebellar neurodegeneration.

Here, we show that the murine neurodegenerative disease mdf (autosomal recessive mouse mutant 'muscle deficient') is caused by a loss-of-function mutation in Scyl1, disrupting the expression of N-terminal kinase-like protein, an evolutionarily conserved putative component of the nucleocytoplasmic transport machinery. Scyl1 is prominently expressed in neurons, and enriched at central nervous system synapses and neuromuscular junctions. We show that the pathology of mdf comprises cerebellar atrophy, Purkinje cell loss and optic nerve atrophy, and therefore defines a new animal model for neurodegenerative diseases with cerebellar involvement in humans.

Dopaminergic vasodilation in the choroidal circulation by d1/d5 receptor activation.

PURPOSE: To test whether exogenous dopamine can cause choroidal vasodilation and to identify the mediating receptors in anesthetized rabbits. METHODS: Mean arterial pressure (MAP), intraocular pressure (IOP), and orbital venous pressure (OVP) were measured by direct cannulation of the central ear artery, the vitreous, and the orbital venous sinus, respectively. Laser Doppler flowmetry was used to measure choroidal blood flow (ChorBF) while MAP was manipulated mechanically with occluders on the aorta and vena cava, thus changing perfusion pressure (PP) over a wide range. In the first group of animals (n = 11), pressure-flow (PF) relationships were performed at control and in response to 40 micro g/kg per minute intravenous (IV) dopamine (D40) and D40+SCH-23390 (0.5 mg/kg, bolus injection IV). In the second group of animals (n = 6), PF relationships were recorded at control and during infusion of SKF-38393 (80 micro g/kg per minute). RESULTS: D40 lowered IOP and caused an upward shift in the choroidal PF relationship, which was blocked by the D1/D5 antagonist SCH-23390 suggesting the involvement of the dopamine D1/D5 receptors. Stimulation of the D1/D5 receptors by infusion of the selective agonist SKF-38393 also lowered IOP and caused an upward shift in the PF relationship. Dopamine and SKF-38393 tended to decrease OVP, but the effect was not significant. CONCLUSIONS: Dopamine can cause choroidal vasodilation in anesthetized rabbits. Because SCH-23390 was able to block the response and SKF-38393 caused a similar vasodilation, we conclude that the vasodilation is caused by a D1/D5-receptor-mediated mechanism.