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Protein Malnutrition Alters Spleen Cell Proliferation and IL-2 and IL-10 Production by Affecting the STAT-1 and STAT-3 Balance

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Abstract

Protein malnutrition (PM) is an important public health problem that affects resistance to infection by impairing a number of physiological processes. PM induces structural changes in the lymphoid organs that affect the roles of the immune and inflammatory responses in a crucial way. The activation of different transcription factors, including signal transducer and activator of transcription (STAT) family members, leads to the production of different cytokines, which are mediators essential to mounting adequate immune and inflammatory responses. In this study, malnourished animals presented anemia, leukopenia, and a severe reduction in spleen cellularity, with reduced numbers of most cell populations, as well as increased percentages of CD3+ and CD4+ cells. The proliferation rates were reduced, and cells were increasingly observed in the G0/G1 cell cycle phase; further, IL-2 production was reduced, while IL-10 production was increased. In spleen cells from malnourished animals, STAT-3 protein expression was increased, with a concomitant reduction in STAT-1 expression. Knowing that STAT-1 and STAT-3 are key transcription factors in both immunity and inflammatory pathways, these results infer, at least in part, a mechanistic pathway that affects the manner or intensity of the immune response in malnourished individuals, increasing susceptibility to infection.

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Acknowledgments

This investigation was supported by grants from the Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP) and the Research Network on Bioactive Molecules from Arthropod Vectors (NAP-MOBIARVE, University of Sao Paulo).

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Correspondence to Ricardo Ambrósio Fock.

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Mello, A.S., de Oliveira, D.C., Bizzarro, B. et al. Protein Malnutrition Alters Spleen Cell Proliferation and IL-2 and IL-10 Production by Affecting the STAT-1 and STAT-3 Balance. Inflammation 37, 2125–2138 (2014). https://doi.org/10.1007/s10753-014-9947-5

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