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Background  The associations between depression and immunity were investigated by measuring the scores of Hamilton Rating Scale for Depression (HRSD) and peripheral lymphocyte parameters in patients with major depressive disorder (MDD).    Methods  Forty-nine patients with MDD were recruited and their clinical symptoms are evaluated with 17-item HRSD which was factorized using the confirmatory factor analysis (i.e., depression factor, insomnia factor, and anxiety factor). Basic immunologic variables such as CD4, CD8, and CD56-positive cell numbers were measured by flow cytometry. Natural killer cell activity (NKCA) was also assessed by ELISA method using K-562 cells as target cells. All patients were treated for 4 weeks with selective serotonin reuptake inhibitors. Immunologic and clinical variables were measured both at baseline and after medication.    Results  CD8-positive cell number was increased ( p  &lt; .05) and CD4/CD8 ratio was decreased ( p  &lt; .01) after medication. NKCA showed a significant positive correlation with anxiety factor scores of HRSD ( p  &lt; .05) at baseline. However, except NKCA, there was no correlation between other immunologic measures and symptom factors.    Conclusion  These results suggest that immunologic measure such as NKCA may be an important variable for symptom of MDD such as anxiety during acute depressive state.

The relation between immunologic variables and symptom factors in patients with major depressive disorder