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More MS news articles for January 2003

Leptin surge precedes onset of autoimmune encephalomyelitis and correlates with development of pathogenic T cell responses

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J Clin Invest 2003 Jan 15;111(2):241-250
Sanna V, Di Giacomo A, La Cava A, Lechler RI, Fontana S, Zappacosta S, Matarese G.
Gruppo di ImmunoEndocrinologia, Istituto di Endocrinologia e Oncologia Sperimentale, Consiglio Nazionale delle Ricerche (IEOS-CNR) and Cattedra di Immunologia, Dipartimento di Biologia e Patologia Cellulare e Molecolare, Universita di Napoli "Federico II," Napoli, Italy. Laboratorio di Immunologia Cellulare, Azienda Ospedaliara "V. Monaldi," Napoli, Italy. Autoimmunity and Tolerance Laboratory, Department of Medicine, University of California, Los Angeles, California, USA. Department of Immunology, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom.

In the work presented here, we explored the influence of leptin on the kinetics of experimental autoimmune encephalomyelitis (EAE) onset, in the EAE-associated inflammatory anorexia, and in the development of pathogenic T cell responses.

We found that the expression of serum leptin increased before the clinical onset of EAE in disease-susceptible C57BL/6J (H-2(b)) and SJL/J (H-2(s)) strains of mice, which are models of chronic-progressive and relapsing-remitting EAE, respectively.

This increase in serum leptin correlated with disease susceptibility, reduction in food intake, and decrease in body weight.

Indeed, acute starvation, which is able to prevent the increase in serum leptin, delayed disease onset and attenuated clinical symptoms by inducing a T helper 2 cytokine switch.

Furthermore, immunohistochemical analysis revealed a parallel in situ production of leptin in inflammatory infiltrates and in neurons only during the acute/active phase of both chronic-progressive and relapsing-remitting EAE.

We also found that leptin secretion by activated T cells sustained their proliferation in an autocrine loop, since antileptin receptor antibodies were able to inhibit the proliferative response of autoreactive T cells in vitro.

Given that leptin appears to regulate EAE susceptibility, inflammatory anorexia, and pathogenic T-cell immune function, we postulate that it may offer a potential target in the treatment of multiple sclerosis.