J. Tornwall et al., T cell attractant chemokine expression initiates lacrimal gland destruction in nonobese diabetic mice, LAB INV, 79(12), 1999, pp. 1719-1726
By inducing both adhesion and migration of lymphocytes, chemokines play an
important role in immune and inflammatory responses. To learn how these pro
cesses promote disease, we have examined the activities of chemokines in th
e lacrimal glands (LG) of nonobese diabetic (NOD) mice, an animal model of
Sjogren's syndrome (SS). The expression of three molecules in the chemokine
superfamily, RANTES, IP-10 and lymphotactin, correlated with the local rec
ruitment of lymphocytes into the LG of NOD mice. Both RANTES and IP-10 gene
transcripts were first detected in these LG when the mice were 8 weeks of
age and amounts increased markedly during the course of active disease; lym
photactin mRNA was also expressed but at lower levels. In situ hybridizatio
n of LG indicated that lymphocytic cells in the inflammatory infiltrates we
re responsible for the production of RANTES and IP-10. Concomitant with the
induction of chemokine expression was the appearance of cellular receptors
for RANTES (CCR1, CCR5) and IP-10 (CXCR3). Furthermore, anti-RANTES treatm
ent significantly reduced inflammation in the LG from NOD mice. In the SS-l
ike disease of NOD mice, this distinct pattern of activity provides evidenc
e for the contribution of these components to site- and time-specific recru
itment of lymphocytes in the characteristic destruction of glandular struct
ures.