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The deficiency of immunoregulatory receptor PD-1 causes mild osteopetrosis.

Abstract：

:Recently, the involvement of immune responses in metabolic bone disease and/or local bone destruction has received much attention. Cytotoxic T lymphocyte-associated antigen 4 (CTLA-4), a member of the immunoglobulin (Ig) superfamily, negatively regulates T cell activation. The deficiency of CTLA-4 induces profound osteopenia with an increase in osteoclastogenesis, suggesting the important role of activated T cells in osteoclastogenesis. Programmed death-1 (PD-1) is the newly identified immunoregulatory receptor, which also belongs to the Ig superfamily. Both CTLA-4 and PD-1 are induced on activated T cells, however, there are no reports linking PD-1 with osteoclasts. In the present study, we have examined the bone phenotype in PD-1-deficient mice PD-1-/- and the role of PD-1 in osteoclastogenesis and osteoclast function. Both trabecular and cortical bone mineral densities of tibia were significantly increased, as observed in peripheral quantitative computed tomography (pQCT), at 12 weeks of age in PD-1-/- mice. Histomorphometric analysis of the PD-1-/- mice and the age-matched controls at 12 weeks of age showed a 2-fold increase in bone volume (BV/TV) with a 55% decrease in osteoclast number (N.Oc/BS). Bone formation indices were similar in both groups. The number of soluble receptor activator of nuclear factor kappaB ligand (sRANKL)-induced osteoclast-like cells (OCLs) derived from the PD-1-deficient splenocytes was significantly decreased (by 25%). On the other hand, PD-1 deficiency did not affect the bone-resorbing activity of mature osteoclasts. Our results suggest that PD-1 deficiency reduces osteoclastogenesis resulting in an osteopetrotic phenotype. Identical members of the Ig superfamily, CTLA-4 and PD-1, which negatively regulate immune responses, may differentially affect osteoclastogenesis and bone remodeling.

journal_name

Bone

journal_title

Bone

authors

Nagahama K,Aoki K,Nonaka K,Saito H,Takahashi M,Varghese BJ,Shimokawa H,Azuma M,Ohya K,Ohyama K

doi

10.1016/j.bone.2004.06.018

subject

Has Abstract

pub_date

2004-11-01 00:00:00

pages

1059-68

issue

5

eissn

8756-3282

issn

1873-2763

pii

S8756-3282(04)00267-4

journal_volume

35

pub_type

杂志文章

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