Low responsiveness of peripheral lymphocytes in extraparenchymal neurocysticercosis

• Published in: PLoS neglected tropical diseases 2023-06, Vol.17 (6), p.e0011386-e0011386
• Main Authors: Romo, Matthew L, Osorio, Rocio, Toledo, Andrea, Carrillo-Mezo, Roger, Valdez, Ricardo, Romano, Marta C, Sciutto, Edda, Fragoso, Gladis, Fleury, Agnès
• Format: Article
• Language: English
• Subjects: 17β-Estradiol; Anthelmintic agents; Antigens; Antiparasitic agents; Biology and Life Sciences; Care and treatment; Cell cycle; Cells; Central nervous system; Cerebrospinal fluid; Cross-sectional studies; Cysticercosis; Cytokines; Diagnosis; Disease; Drug dosages; Endocrine system; Health aspects; Hormones; Humans; Immunology; Inflammation; Inflammatory response; Interleukin 4; Interleukin 5; Interleukin 6; Killer Cells, Natural; Laboratories; Lymphocytes; Male; Medical treatment; Medicine and Health Sciences; Metabolic disorders; Morbidity; Neurocysticercosis - drug therapy; Parasites; Proteins; Serum; Sex hormones; Steroids; Stimulation; Tropical diseases; Tumor Necrosis Factor-alpha; Tumor necrosis factor-α; γ-Interferon
• ISSN: 1935-2735; 1935-2727; 1935-2735
• DOI: 10.1371/journal.pntd.0011386

The morbidity and mortality of extraparenchymal neurocysticercosis (EP-NC) remain high and effectiveness of current medical treatment is suboptimal. Various factors have been implicated in the severity of EP-NC and in the poor response to treatment, but the possible role of host immune and endocrine systems has not yet been examined thoroughly. 42 participants with EP-NC before receiving standard treatment and 25 healthy controls were included in the study. Treatment response was assessed by comparing pre/post treatment parasite volumes from 3D MRI. Prior to treatment among participants with EP-NC, specific stimulation induced an increased specific proliferative response accompanied by a significant increase in IL-4, NK, NKT, Bregs and Tregs cells, whereas in healthy controls, specific stimulation induced a significant increase in IL-1β, IL-5, CCL5, IL-6, TNF-α, NK and Bregs cells. Significant differences between participants with EP-NC and healthy controls in the specific inflammatory response were observed. Participants with EP-NC prior to treatment had significantly weaker responses of proinflammatory cytokines (IL-6, TNF-α) and NK cells, and stronger IL-4 response. Anthelmintic treatment did not promote significant peripheral immunological changes at any time, although inflammation was sustained in the cerebrospinal fluid. Serum estradiol concentration significantly decreased after anthelmintic treatment among males, and cortisol correlated negatively with IL-6 and positively with IFN-γ levels. No pre-treatment immunologic or endocrinologic parameters were significantly associated with response to treatment. Prior to anthelmintic treatment, EP-NC was characterized by low lymphocyte reactivity accompanied by a regulatory response, which may be involved in the lack of peripheral immunological changes during and after treatment, although a central inflammatory response was present. This weak specific peripheral response could favor the chronicity of the infection and the poor response to treatment. Our findings highlight the need for new anti-inflammatory treatment focused on the central nervous system with less systemic immunosuppressive effects.