RESUMO
A potential role for macroautophagy dysfunction in the pathogenesis of amyotrophic lateral sclerosis (ALS) was hypothesized after the demonstration that selected markers are up-regulated in post mortem samples obtained from both patients and animal models of disease. We hypothesized that a putative dysfunction of this catabolic pathway could be operative also in peripheral blood mononuclear cells (PBMC) obtained from ALS patients, since these cells represent an accessible model for studying molecular pathogenesis events in neuropsychiatric disorders. Beclin-1 and LC3II immunoreactivity were assessed in PBMC from 15 ALS patients and 15 controls by Western blot analysis. The expression of Atg12 mRNA was also assessed by real-time PCR. No significant difference was observed for all these parameters between patients and controls, although PBMC displayed a clear macroautophagy induction following exposure to rapamycin and lithium. Finally, we excluded a putative interference of riluzole demonstrating that LC3II immunoreactivity did not change in riluzole-treated SH-SY5Y neuroblastoma cells. In conclusion, the results of our pilot study do not support the idea of a systemic macroautophagic dysfunction in ALS, although they confirm that PBMC are a suitable peripheral marker for monitoring the effects of drugs interfering with this catabolic pathway.
Assuntos
Esclerose Lateral Amiotrófica/sangue , Autofagia/fisiologia , Biomarcadores/sangue , Leucócitos Mononucleares/metabolismo , Idoso , Esclerose Lateral Amiotrófica/tratamento farmacológico , Proteínas Reguladoras de Apoptose/genética , Proteínas Reguladoras de Apoptose/metabolismo , Proteína Beclina-1 , Células Cultivadas , Feminino , Humanos , Leucócitos Mononucleares/citologia , Masculino , Proteínas de Membrana/genética , Proteínas de Membrana/metabolismo , Proteínas Associadas aos Microtúbulos/genética , Proteínas Associadas aos Microtúbulos/metabolismo , Pessoa de Meia-Idade , Fármacos Neuroprotetores/uso terapêutico , Riluzol/uso terapêuticoRESUMO
The authors describe a large outbreak of canine salmonellosis in a municipal kennel in Tuscany. During the outbreak, 174 samples of 'diarrhetic' and 'normal' faeces and two batches of commercial dehydrated dog food were cultured for pathogenic bacteria. The results of 25, out of a total of 41 dogs (60.9%) revealed at least one faecal sample as being positive for Salmonella; incidence per sampling ranged from 12.5% to 34%. Nine of 10 samples of dehydrated food were positive. Ten totally different serotypes were isolated from dry food and faeces: the results of the pulsed-field gel electrophoresis referred to similarity between the Salmonella Montevideo, Muenster and Worthington isolates recovered from both the food and canine faecal samples.