Acta parasitologica · 2022
Recombinant Mouse Prolactin Confers Partial Protection Against Toxoplasma gondii Infection in a Pre-treated Experimental Murine Model.
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Atia Amany F, Beshay Engy V N, Fath-Allah Samar K, Sweed Dina, El-Refai Samar A
Аннотация
INTRODUCTION: Toxoplasmosis is one of the most important health-threatening diseases with worldwide distribution and global impact. It is caused by Toxoplasma gondii (T. gondii), an intracellular apicomplexan parasite that can evade the host immune responses and establish a chronic infection. The available treatments are not efficient against this stage and have many adverse effects. There are no available effective vaccines, apart from Toxovax®, which is used in sheep to prevent abortion. Studies documented that prolactin (PRL) had in vivo and in vitro anti-Toxoplasma effects. Detailed research was recommended about the mechanisms of such inhibitory effects.
AIM: This study was designed to assess the possible protective role of the recombinant prolactin (rPRL) against T. gondii.
MATERIALS AND METHODS: Sixty experimentally infected mice with T. gondii were used. The treated mice received rPRL for five days before infection. Serum prolactin levels were measured; survival rate was monitored; number, size, and DNA of T. gondii cysts in the brain were measured; and histopathological and immunological studies were done.
RESULTS: There was a significant increase in the survival rate of the rPRL-treated mice, a significant decrease in the number, size, and DNA amount of T. gondii cysts in the brain with a noticeable improvement of histopathological lesions in the brain and liver tissues when compared to the infected untreated group. These effects seem to be achieved through stimulating humoral and cell-mediated immune responses that were evident by the significant rise in serum levels of anti-Toxoplasma IgM, IFN-γ, and TNF-α.
CONCLUSION: The rPRL elicited robust immune responses, which provided efficient protection against murine T. gondii infection.
AIM: This study was designed to assess the possible protective role of the recombinant prolactin (rPRL) against T. gondii.
MATERIALS AND METHODS: Sixty experimentally infected mice with T. gondii were used. The treated mice received rPRL for five days before infection. Serum prolactin levels were measured; survival rate was monitored; number, size, and DNA of T. gondii cysts in the brain were measured; and histopathological and immunological studies were done.
RESULTS: There was a significant increase in the survival rate of the rPRL-treated mice, a significant decrease in the number, size, and DNA amount of T. gondii cysts in the brain with a noticeable improvement of histopathological lesions in the brain and liver tissues when compared to the infected untreated group. These effects seem to be achieved through stimulating humoral and cell-mediated immune responses that were evident by the significant rise in serum levels of anti-Toxoplasma IgM, IFN-γ, and TNF-α.
CONCLUSION: The rPRL elicited robust immune responses, which provided efficient protection against murine T. gondii infection.