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Somatolactogens, somatomedins, and immunity
S Arkins1, R Dantzer, K W Kelley
1Department of Animal Sciences, University of Illinois, Urbana 61801.
Journal of Dairy Science
|August 1, 1993
Summary
Neuroendocrine hormones like growth hormone and prolactin significantly impact immune cell function. These hormones, along with Insulin-like Growth Factor-I (IGF-I), enhance immune responses and tissue maintenance.
Area of Science:
- Neuroendocrinology
- Immunology
- Cellular Biology
Background:
- The neuroendocrine and immune systems are interconnected, utilizing shared signaling molecules for communication.
- Somatolactogen family hormones (growth hormone, prolactin) influence immune events, including lymphoid tissue cellularity and DNA synthesis.
- These hormones promote erythropoiesis and DNA synthesis in bone marrow.
Purpose of the Study:
- To investigate the role of somatolactogens and somatomedins in modulating immune cell effector functions.
- To explore the mechanisms by which these hormones influence immune responses.
Main Methods:
- The study focused on analyzing the effects of somatolactogens and IGF-I on phagocytic cell functions.
- Key immune responses examined included reactive oxygen intermediate production, tumor necrosis factor-alpha release, and bacterial killing.
- The research also considered the production of these hormones by immune cells.
Main Results:
- Somatolactogens and IGF-I were found to be particularly effective in modulating phagocytic cell effector functions.
- Specific modulations included enhanced production of reactive oxygen intermediates and tumor necrosis factor-alpha.
- Improved oxygen-dependent killing of bacteria by phagocytic cells was also observed.
Conclusions:
- Somatolactogenic hormones and IGF-I play a significant role in regulating immune cell functions.
- These hormones can act at endocrine, paracrine, and autocrine levels within immune tissues.
- Further research is needed to fully elucidate the molecular mechanisms underlying these effects.