Plasma, brain and spinal cord concentrations of caffeine are reduced in the SOD1G93A mouse model of amyotrophic lateral sclerosis following oral administration.

Modifications to the small intestine and liver are known to occur during the symptomatic disease period of amyotrophic lateral sclerosis (ALS), a member of the motor neuron disease (MND) family of neurodegenerative disorders. How these modifications impact on oral absorption and pharmacokinetics of drugs remains unknown. In this study, model drugs representing different mechanisms of intestinal transport (caffeine for passive diffusion, digoxin for P-glycoprotein efflux, and sulfasalazine for breast cancer resistance protein efflux) were administered via oral gavage to postnatal day 114-120 male and female SOD1G93A mice (model of familial ALS) and wild-type (WT) littermates. Samples of blood, brain and spinal cord were taken at either 15, 30, 60 or 180 min after administration. In addition, the in vivo gastric emptying of 70 kDa fluorescein isothiocyanate-dextran (FITC-dextran) and the ex vivo intestinal permeability of caffeine were assessed. The area under the plasma concentration-time curves (AUCplasma) of digoxin and sulfasalazine were not significantly different between SOD1G93A and WT mice for both sexes. However, the AUCplasma of caffeine was significantly lower (female: 0.79-fold, male: 0.76-fold) in SOD1G93A compared to WT mice, which was associated with lower AUCbrain (female: 0.76-fold, male: 0.80-fold) and AUCspinal cord (female: 0.81-fold, male: 0.82-fold). The AUCstomach of caffeine was significantly higher (female: 1.5-fold, male: 1.9-fold) in SOD1G93A compared to WT mice, suggesting reduced gastric emptying in SOD1G93A mice. In addition, there was a significant reduction in gastric emptying of FITC-dextran (0.66-fold) and ex vivo intestinal permeability of caffeine (0.52-fold) in male SOD1G93A compared to WT mice. Reduced systemic and brain/spinal cord exposure of caffeine in SOD1G93A mice may therefore result from alterations to gastric emptying and small intestinal permeability. Specific dosing requirements may therefore be required for certain medicines in ALS to ensure that they remain in a safe and effective concentration range.

Autoantibodies in laryngeal cancer: detection and role as a biomarker.

OBJECTIVE: Diagnostic role of autoantibodies (AAb) as serological biomarkers has not been specifically investigated in laryngeal cancer (LC) previously. The study investigates the presence of anti-LC AAbs and their potential as a biomarker for early diagnosis of LC, to improve patient outcome. METHOD: Anti-LC AAb levels were investigated in LC patients (n = 30) and healthy individuals (n = 30) by indirect enzyme-linked immunosorbent assay (ELISA). Patient AAb levels were analyzed with various clinical factors, primarily tumor stage. RESULTS: AAb levels were significantly higher in LC patients than in the control group (P = .019). The diagnostic performance of AAb-level testing for LC detection presented a sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), and accuracy of 70% each. The positive likelihood (LR+) and negative likelihood (LR-) ratios were 2.33 and 0.43, respectively. AAb levels were independent of cancer stage (P = .708), duration since first appearance of symptoms (P = .228), duration of medical attention (P = .231), and degree of risk-factor exposure (P = .478). CONCLUSION: Significant level of AAbs could be detected among LC patients with good diagnostic performance, irrespective of stage. Thus, anti-LC AAbs reflect potential to be utilized as predictive biomarkers in early diagnostics of LC.