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[Interleukin level in endogenous depression]
Abstract:
Interleukin level and mononuclear phagocytes (MPh) activity have been studied in 19 patients with mono- and bipolar depression. All the patients were examined at admission to a hospital before treatment. The depression was characterized by low MPh activity, a significant (p < 0.05) fall in IL-1 beta production by stimulated monocytes, a trend to reduction of IL-2 production by stimulated lymphocytes, significant (p < 0.05) IL-2 serum concentration increase and significant (p = 0.05) decrease of soluble IL-2 receptor (siL-2R) concentration in the serum. Significant positive correlation (r = 0.76; p < 0.05) between MPh activity and IL-1 beta production has been found. Interleukin alterations were most manifest at the early disease stage (symptoms onset is less than one year). It is suggested that IL-2 accumulation in the blood serum in these patients is strongly influenced by a significant decrease of siL-2R serum concentration. MPh (the main IL-2 producers) activity reduction results in the monocyte IL-1 beta production decrease followed by changes in interleukin (in particular, IL-2) production by lymphocytes and other changes in interleukin system.
Insights
Depression is linked to reduced mononuclear phagocyte (MPh) activity and altered interleukin (IL) levels, particularly lower IL-1 beta production and increased IL-2. These changes are most pronounced in early-stage depression.
Area of Science:
- Neuroimmunology
- Psychiatry
Context:
- Interleukin (IL) levels and mononuclear phagocyte (MPh) activity are implicated in mood disorders.
- Previous research suggests a link between immune system dysregulation and depression.
Purpose:
- To investigate the relationship between interleukin levels, mononuclear phagocyte activity, and depression in patients before treatment.
- To explore alterations in IL-1 beta, IL-2, and soluble IL-2 receptor (sIL-2R) in relation to MPh activity in mono- and bipolar depression.
Summary:
- A study of 19 patients with depression revealed low MPh activity, decreased IL-1 beta production by monocytes (p < 0.05), and a trend towards reduced IL-2 production by lymphocytes.
- Significant findings included increased IL-2 serum concentration (p < 0.05) and decreased sIL-2R concentration (p = 0.05).
- A strong positive correlation (r = 0.76; p < 0.05) was observed between MPh activity and IL-1 beta production.
Impact:
- Findings suggest that reduced MPh activity leads to decreased monocyte IL-1 beta production, influencing lymphocyte IL-2 production and overall interleukin system changes in depression.
- Interleukin alterations, especially IL-2 accumulation due to decreased sIL-2R, are most pronounced in early disease stages (symptoms onset < 1 year).
- This research highlights potential immune biomarkers for early depression detection and intervention.