Eh. Strom et al., CYCLOSPORINE-ASSOCIATED ARTERIOLOPATHY - THE RENIN PRODUCING VASCULARSMOOTH-MUSCLE CELLS ARE MORE SENSITIVE TO CYCLOSPORINE TOXICITY, Clinical nephrology, 43(4), 1995, pp. 226-231
The pathogenesis of ciclosporin (Cs) induced renal vasoconstriction an
d CS-associated arteriolopathy (CAA) has not been fully explained. CAA
affects the part of the afferent arteriole where renin is most abunda
nt, and an effect by Cs on the renin producing smooth muscle cells lea
ding to necrosis has been suggested. Forty transplant biopsies with CA
A of different degrees were compared with 10 transplant biopsies from
Cs treated patients without CAA, and with 10 ''zero-hour'' control bio
psies (taken from the donor kidney at implantation). Immunoreactivity
to renin by the ABC method was recorded in the arterioles. Compared to
the control group there was a slight increase in the proportion of re
nin positive arterioles in the Cs treated group without CAA, but with
increasing CAA there was a decrease in the proportion of renin positiv
e arterioles. In the group of arterioles with CAA, we found that with
increase in the severity of CAA, there was an increase in renin negati
ve arterioles, indicating a loss of renin containing cells in these ar
terioles. This suggests that a large proportion of the necrotic cells
in CAA has once been renin producing smooth muscle cells. Our findings
support the possibility that Cs stimulates renin production, and that
the renin producing cells are more sensitive to Cs toxicity.