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Neonatal programming of neuroimmunomodulation--role of adipocytokines and neuropeptides
E G de Moura1, P C Lisboa, M C F Passos
1Departamento de Ciências Fisiológicas, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brasil. egberto@pq.cnpq.br
Insights
Early life nutrition and stress can epigenetically program organisms, creating a thrifty phenotype. This programming, particularly involving hormones like leptin, can increase the risk of metabolic diseases and affect neuroimmunomodulation later in life.
Area of Science:
- Epigenetics
- Developmental Biology
- Metabolic Health
Background:
- Programming is an epigenetic process where early-life factors like nutrition and stress shape development.
- This adaptive mechanism, selected for survival in harsh conditions, results in a 'thrifty phenotype'.
- Individuals with this phenotype are susceptible to metabolic diseases when nutrients become abundant.
Purpose of the Study:
- To explore how maternal and neonatal hormonal and metabolic changes during critical periods can program neuroimmunomodulatory effects.
- To investigate the role of specific hormones (thyroid hormones, leptin, insulin, glucocorticoids, prolactin) as imprinting factors.
- To understand the impact of these programmed changes on body weight, composition, insulin action, and immune responses.
Main Methods:
- Review of hormonal and metabolic changes in mothers and neonates.
- Analysis of how these factors are transferred (e.g., via milk).
- Discussion of the programming effects of key hormones, with a focus on leptin.
Main Results:
- Early-life malnutrition can activate genes leading to a thrifty phenotype.
- Hormonal imprinting during critical periods influences neuroimmunomodulation.
- Leptin, a cytokine, appears central to these programming events, affecting various physiological systems.
Conclusions:
- Early-life programming via nutrition and stress has long-term consequences on metabolic and immune health.
- Hormones like leptin play a crucial role in mediating these programming effects.
- Understanding these mechanisms is vital for preventing metabolic and inflammatory diseases.
Abstract:
Programming is an epigenetic phenomenon by which nutrition, environment and stress acting in a critical period earlier in life change the organism's development. This process was evolutionarily selected as an adaptive tool for the survival of organisms living in nutritionally deficient areas and submitted to stressful conditions. Thus, perinatal malnutrition turns on different genes that provide the organism with a thrifty phenotype. In conditions of abundant supply of nutrients, those programmed organisms can be at risk of developing metabolic diseases (obesity, dyslipidemia, diabetes and hypertension). How nutrition or neonatal stress can program the immune system is less well known. Here, we discuss some of the hormonal and metabolic changes that occur in mothers and neonates and how those factors can imprint hormonal or metabolic changes that program neuroimmunomodulatory effects. Some of these changes involve thyroid hormones, leptin, insulin, glucocorticoids and prolactin as potential imprinting factors. Most of them can be transferred through the milk and may change with malnutrition or stress. We discuss the programming effects of these hormones upon body weight, body composition, insulin action, thyroid, adrenal and immune and inflammatory responses, with special emphasis on leptin, a cytokine that seems to play a central role in these events.
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