Characterization of a Sarcocystis neurona isolate (SN6) from a naturally infected horse from Oregon.

The research article covers the study of the isolation of a Sarcocystis neurona (SN6) parasite from the spinal cord of a neurologically impaired horse from Oregon. The parasite was cultured in bovine monocytes and equine spleen cells, and was later found in the lesions of gamma interferon knockout mice.

Introduction

Sarcocystis neurona is a parasite often linked to severe neurological diseases in horses. The study primarily focuses on the identification and isolation of a particular isolate of this parasite, SN6, from a horse displaying neurological signs.

Isolation and Culture of The Parasite

• The SN6 isolate was extracted from the spinal cord of the affected horse from Oregon.
• It was then placed in cultures of bovine monocytes (a type of white blood cell) and equine spleen cells for growth and multiplication.

Parasite Reproduction Study

• The parasite’s reproduction process was then observed, through a process known as endopolygeny, where one parent cell multiplies into many.
• This process was found to complete at least one asexual cycle in cell cultures in three days, providing an insight into the replication dynamics of the parasite.

Transmission to Mice

• Post the observation in cell culture, the parasite was then introduced to gamma interferon knockout mice, to investigate the transmission process.
• The mice, inoculated with merozoites (a form of the parasite) derived from the cell culture, showed signs of illness 35 days post the introduction.
• Post-mortem examination of the affected mice revealed the presence of S. neurona schizonts and merozoites within lesions in the brain, confirming the transmissibility of the parasites.

Confirmation of The Parasite

• The infiltrated tissue sections of the mice brains reacted with S. neurona-specific antibodies, confirming the identity of the parasite.
• Further, S. neurona was also reisolated from the brain of the affected mice, providing an additional confirmation of the parasite’s presence and its replicative continuity within a host.