TY - JOUR
T1 - Calorie restriction induces reversible lymphopenia and lymphoid organ atrophy due to cell redistribution
AU - Contreras, Nico A.
AU - Fontana, Luigi
AU - Tosti, Valeria
AU - Nikolich-Žugich, Janko
N1 - Funding Information:
Funding information This study is supported by the grant AG045734 from the USPS (National Institute of Aging, NIH) to J.N-Z and grants from the Bakewell Foundation, the Longer Life Foundation (an RGA/Washington University Partnership), and the National Center for Research Resources (UL1 RR024992) to L.F.
Funding Information:
This research was also supported in part by the National Institute on Aging-Intramural Research Program; the funding agencies had no role in the analysis or interpretation of the data or in the decision to submit the report for publication.
Publisher Copyright:
© 2018, American Aging Association.
PY - 2018/6/1
Y1 - 2018/6/1
N2 - Calorie restriction (CR) without malnutrition increases life span and health span in multiple model organisms. In non-human and human primates, CR causes changes that protect against several age-related pathologies, reduces inflammation, and preserves or improves cell-mediated immunity. However, CR has also been shown to exhibit adverse effects on certain organs and systems, including the immune system, and to impact genetically different organisms of the same species differentially. Alternately, short periods of fasting followed by refeeding may result in the proliferation of bone marrow stem cells, suggesting a potential rejuvenation effect that could impact the hematopoietic compartment. However, the global consequences of CR followed by refeeding on the immune system have not been carefully investigated. Here, we show that individuals practicing long-term CR with adequate nutrition have markedly lower circulating levels of total leukocytes, neutrophils, lymphocytes, and monocytes. In 10-month-old mice, short-term CR lowered lymphocyte cellularity in multiple lymphoid tissues, but not in bone marrow, which appears to be a site of influx, or a “safe haven” for B, NK, and T cells during CR. Cellular loss and redistribution was reversed within the first week of refeeding. Based on BrdU incorporation and Ki67 expression assays, repopulating T cells exhibited high proliferation in the refeeding group following CR. Finally, we demonstrated that the thymus was not essential for T cell repopulation following refeeding. These findings are of potential relevance to strategies to rejuvenate the immune system in mammals and warrant further investigation.
AB - Calorie restriction (CR) without malnutrition increases life span and health span in multiple model organisms. In non-human and human primates, CR causes changes that protect against several age-related pathologies, reduces inflammation, and preserves or improves cell-mediated immunity. However, CR has also been shown to exhibit adverse effects on certain organs and systems, including the immune system, and to impact genetically different organisms of the same species differentially. Alternately, short periods of fasting followed by refeeding may result in the proliferation of bone marrow stem cells, suggesting a potential rejuvenation effect that could impact the hematopoietic compartment. However, the global consequences of CR followed by refeeding on the immune system have not been carefully investigated. Here, we show that individuals practicing long-term CR with adequate nutrition have markedly lower circulating levels of total leukocytes, neutrophils, lymphocytes, and monocytes. In 10-month-old mice, short-term CR lowered lymphocyte cellularity in multiple lymphoid tissues, but not in bone marrow, which appears to be a site of influx, or a “safe haven” for B, NK, and T cells during CR. Cellular loss and redistribution was reversed within the first week of refeeding. Based on BrdU incorporation and Ki67 expression assays, repopulating T cells exhibited high proliferation in the refeeding group following CR. Finally, we demonstrated that the thymus was not essential for T cell repopulation following refeeding. These findings are of potential relevance to strategies to rejuvenate the immune system in mammals and warrant further investigation.
KW - Aging
KW - Calorie restriction
KW - Cellular immunology
KW - Leukocytes
KW - Lymphocytes
KW - Rejuvenation
UR - http://www.scopus.com/inward/record.url?scp=85047398533&partnerID=8YFLogxK
U2 - 10.1007/s11357-018-0022-2
DO - 10.1007/s11357-018-0022-2
M3 - Article
C2 - 29804201
AN - SCOPUS:85047398533
VL - 40
SP - 279
EP - 291
JO - GeroScience
JF - GeroScience
SN - 2509-2715
IS - 3
ER -