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2013 ; 65
(10
): 2567-72
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Brief report: deficient thymic output in rheumatoid arthritis despite abundance
of prethymic progenitors
#MMPMID23818218
Wagner U
; Schatz A
; Baerwald C
; Rossol M
Arthritis Rheum
2013[Oct]; 65
(10
): 2567-72
PMID23818218
show ga
OBJECTIVE: To determine the frequencies of common lymphoid progenitors (CLPs) and
recent thymic emigrants (RTEs) in patients with rheumatoid arthritis (RA) and
healthy control subjects. METHODS: Flow cytometry was performed to determine the
frequencies of CLPs and RTEs in the peripheral blood of 101 control subjects and
51 patients with RA. Thirteen of these patients were also analyzed longitudinally
for 6 months after initiation of treatment with a tumor necrosis factor (TNF)
inhibitor. RESULTS: A significant correlation between the frequencies of CLPs and
RTEs was observed in healthy control subjects. The frequencies of both CLPs and
RTEs decreased with age and correlated inversely with absolute lymphocyte numbers
in peripheral blood. In patients with RA, the frequencies of RTEs were
significantly decreased compared with the frequencies in control subjects.
Importantly, the frequencies of CLPs were significantly higher in patients with
RA compared with control subjects. Therapeutic TNF blockade further increased the
frequency of CLPs, thereby normalizing thymic output, as indicated by an increase
in the number of RTEs. CONCLUSION: Thymic insufficiency in RA is not attributable
to an inadequate supply of progenitor cells to the thymus. Thus, insufficient
numbers of RTEs could result from inadequate thymic T cell neogenesis, or
alternatively, could be a consequence of high CD4+ T cell turnover, homeostatic
proliferation, and subsequent dilution of the RTE population.
|Adult
[MESH]
|Aged
[MESH]
|Aged, 80 and over
[MESH]
|Aging/pathology
[MESH]
|Antirheumatic Agents/pharmacology/therapeutic use
[MESH]