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ER alpha expression in T lymphocytes is dispensable for estrogenic effects in bone

Journal article
Authors Karin L. Gustafsson
Karin H. Nilsson
Helen H. Farman
Vikte Lionikaite
Petra Henning
Jianyao Wu
Sara H Windahl
Ulrika Islander
Sofia Moverare-Skrtic
Klara Sjögren
Hans Carlsten
Claes Ohlsson
Marie Lagerquist
Published in Journal of Endocrinology
Volume 238
Issue 2
Pages 129-136
ISSN 0022-0795
Publication year 2018
Published at Institute of Medicine, Department of Rheumatology and Inflammation Research
Centre for Bone and Arthritis Research
Institute of Medicine, Department of Internal Medicine and Clinical Nutrition
Pages 129-136
Language en
Links dx.doi.org/10.1530/joe-18-0183
Keywords T lymphocytes, estrogen receptor alpha, estrogen, bone loss, receptor-alpha, cortical bone, deficient mice, knockout mice, female, mice, cells, estradiol, ligand, ovariectomy, osteoclasts, Endocrinology & Metabolism
Subject categories Endocrinology

Abstract

Estrogen treatment has positive effects on the skeleton, and we have shown that estrogen receptor alpha (ERa) expression in cells of hematopoietic origin contributes to a normal estrogen treatment response in bone tissue. T lymphocytes are implicated in the estrogenic regulation of bone mass, but it is not known whether T lymphocytes are direct estrogen target cells. Therefore, the aim of this study was to determine the importance of ERa expression in T lymphocytes for the estrogenic regulation of the skeleton using female mice lacking ERa expression specifically in T lymphocytes (Lck-ERa-/-) and ERaflox/flox littermate (control) mice. Deletion of ERa expression in T lymphocytes did not affect bone mineral density (BMD) in sham-operated Lck-ERa-/compared to control mice, and ovariectomy (ovx) resulted in a similar decrease in BMD in control and Lck-ERa-/- mice compared to sham-operated mice. Furthermore, estrogen treatment of ovx Lck-ERa-/- led to an increased BMD that was indistinguishable from the increase seen after estrogen treatment of ovx control mice. Detailed analysis of both the appendicular (femur) and axial (vertebrae) skeleton showed that both trabecular and cortical bone parameters responded to a similar extent regardless of the presence of ERa in T lymphocytes. In conclusion, ERa expression in T lymphocytes is dispensable for normal estrogenic regulation of bone mass in female mice.

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