Experimental model for the study by chemiluminescence of the activation of isolated equine leucocytes.

This study focuses on understanding how equine white blood cells, or leucocytes, respond and react under various conditions by measuring their production of light during chemical reactions, known as chemiluminescence.

Chemiluminescence and Leucocytes

• Chemiluminescence processes in human polymorphonuclear leucocytes, a type of white blood cell, can be studied by observing and measuring changes in their light emissions during chemical reactions—referred to as a ‘respiratory burst.’
• The authors of the study adapted this method to investigate the conditions affecting the chemiluminescence of equine leucocytes. The variables examined included the number of cells, the concentration of the activator, enhancers of chemiluminescence, pH, temperature, and inhibitors.

Methods and Experimental Setup

• Leucocytes were isolated from the blood of healthy horses for these experiments, and a Bio-Orbit luminometer was used to measure chemiluminescence. This device is specifically designed to detect light at 900 nm wavelength.
• According to the study, the ideal cell density for the highest chemiluminescence response was found between 10(6) to 10(7) leucocytes per 600 microliters.

Findings and Implications

• The research found that the light emitted by these cells is affected by temperature and pH as well as by the concentrations of illuminating chemicals such as luminol, lucigenin, and phorbol myristate acetate (PMA).
• The study noted that azide could significantly inhibit the chemiluminescent process, while superoxide dismutase completely inhibited the response.
• The study also highlighted the variability of response under the same conditions, suggesting that the origin of the leucocytes might play a role in chemiluminescence.
• The conditions that yielded the most optimal results for equine chemiluminescence measurements fell within physiological norms: a pH of 7.4, a temperature of 37.8 degrees Celsius, along with certain concentrations of leucocytes, PMA, luminol, and lucigenin.
• The results showed that the optimal conditions for studying equine leucocyte chemiluminescence resemble those used to analyze human leucocytes, suggesting potential similarities in the biological mechanisms between these species.