Volume 27, Issue 4 pp. 243-248
Full Access

Role of photoperiod and the pineal gland in T cell-dependent humoral immune reactivity in the Siberian hamster

Steven M. Yellon

Corresponding Author

Steven M. Yellon

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, California

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, CA 92350. E-mail: [email protected]Search for more papers by this author
Laura A. Teasley

Corresponding Author

Laura A. Teasley

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, California

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, CA 92350. E-mail: [email protected]Search for more papers by this author
Omar R. Fagoaga

Corresponding Author

Omar R. Fagoaga

Loma Linda University School of Medicine and Immunology Center, Loma Linda University Medical Center, Loma Linda, California

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, CA 92350. E-mail: [email protected]Search for more papers by this author
Hellen C. Nguyen

Corresponding Author

Hellen C. Nguyen

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, California

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, CA 92350. E-mail: [email protected]Search for more papers by this author
Huy N. Truong

Corresponding Author

Huy N. Truong

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, California

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, CA 92350. E-mail: [email protected]Search for more papers by this author
Sandra L. Nehlsen-Cannarella

Corresponding Author

Sandra L. Nehlsen-Cannarella

Departments of Physiology and Pathology, Loma Linda University Medical Center, Loma Linda, California

Loma Linda University School of Medicine and Immunology Center, Loma Linda University Medical Center, Loma Linda, California

Center for Perinatal Biology, Loma Linda University Medical Center, Loma Linda, CA 92350. E-mail: [email protected]Search for more papers by this author
First published: 30 January 2007
Citations: 45

Abstract

Abstract: The present study tested the hypothesis that antibody production in response to xenoantigen is modulated by daylength and dependent upon the pineal gland. After injection of sheep erythrocytes (SRBC), serum immunoglobulin (Ig) concentrations were 5-fold lower in hamsters in short versus long days. Pinealectomy (Pinx) abolished the nocturnal melatonin rhythm, blocked short-day-mediated testis regression, and eliminated the short-day reduction in Ig production after SRBC treatment. Antibody titers in response to SRBC were equivalently augmented in short-day Pinx and long-day sham hamsters. The results indicate that photoperiodic effects on T cell-dependent humoral immunity are dependent upon the pineal gland. These findings raise the possibility that day length-associated changes in some immune system functions are mediated by the pineal melatonin rhythm.

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