Effect of cryotherapy on paclitaxel-induced peripheral neuropathy of the hand in female breast cancer patients: A prospective self-controlled study.

AIMS: The purpose of this study was to examine the efficacy of cryotherapy with frozen gloves for the prevention of the chemotherapy-induced peripheral neuropathy of the hand. BACKGROUND: Most breast cancer patients receive chemotherapy; consequently, patients frequently experience adverse effects of chemotherapy-induced peripheral neuropathy. METHODS: A quasi-experimental and prospective self-controlled study was conducted. Breast cancer patients wore frozen glove on the dominant hand for 90 min during their weekly treatment with paclitaxel (80 mg/m2 ). Treatment of the dominant hand, the intervention group, was continued for 12 weeks. The non-dominant hand was considered the control group. RESULTS: A total of 22 patients participated in this study, and only one patient did not reach the cumulative dose (960 mg/m2 ). Findings show that the incidences of sensory and motor symptoms of chemotherapy-induced peripheral neuropathies at the following times (Time 1 to Time 4) were significantly lower in the intervention group than in the control group. However, although the incidences of motor symptoms were lower in the experimental group than in the control group, a significant difference was shown only at Time 4. Additionally, both groups of patients reported that their incidence of sensory symptoms were higher than those of motor symptoms. CONCLUSION: Cryotherapy with frozen gloves is useful in reducing both the sensory and motor symptoms of the chemotherapy-induced peripheral neuropathy of the hands.

SARS-CoV nucleocapsid protein interacts with cellular pyruvate kinase protein and inhibits its activity.

The pathogenesis of SARS-CoV remains largely unknown. To study the function of the SARS-CoV nucleocapsid protein, we have conducted a yeast two-hybrid screening experiment to identify cellular proteins that may interact with the SARS-CoV nucleocapsid protein. Pyruvate kinase (liver) was found to interact with SARS-CoV nucleocapsid protein in this experiment. The binding domains of these two proteins were also determined using the yeast two-hybrid system. The physical interaction between the SARS-CoV nucleocapsid and cellular pyruvate kinase (liver) proteins was further confirmed by GST pull-down assay, co-immunoprecipitation assay and confocal microscopy. Cellular pyruvate kinase activity in hepatoma cells was repressed by SARS-CoV nucleocapsid protein in either transiently transfected or stably transfected cells. PK deficiency in red blood cells is known to result in human hereditary non-spherocytic hemolytic anemia. It is reasonable to assume that an inhibition of PKL activity due to interaction with SARS-CoV N protein is likely to cause the death of the hepatocytes, which results in the elevation of serum alanine aminotransferase and liver dysfunction noted in most SARS patients. Thus, our results suggest that SARS-CoV could reduce pyruvate kinase activity via its nucleocapsid protein, and this may in turn cause disease.