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2015 ; 2
(1
): e000121
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English Wikipedia
Pharmacodynamic monitoring of (immuno)proteasome inhibition during bortezomib
treatment of a critically ill patient with lupus nephritis and myocarditis
#MMPMID26719810
de Groot KA
; Tsang A Sjoe M
; Niewerth D
; Cloos J
; Blank JL
; Niessen HW
; Zweegman S
; Voskuyl AE
; Jansen G
; van der Heijden JW
Lupus Sci Med
2015[]; 2
(1
): e000121
PMID26719810
show ga
OBJECTIVE: To describe the pharmacodynamic monitoring of (immuno)proteasome
inhibition following treatment with bortezomib in a therapy-refractory systemic
lupus erythematosus (SLE) patient with life-threatening myocarditis and lupus
nephritis. PATIENT AND METHODS: Inhibition of catalytic activities of the
proteasome subunits ?5 (constitutive proteasome), ?5i and ?1i (immunoproteasome)
were measured in peripheral blood mononuclear cells using subunit-specific
fluorogenic peptide substrates in a patient who received three cycles of
bortezomib (1.3?mg/m(2) subcutaneously, days 1, 4, 8 and 11; every three?weeks)
along with plasma exchange during the first two cycles. RESULTS: Proteasome ?5,
?5i and ?1i subunit activities were readily inhibited 1?h after bortezomib
administration. Twenty-four hours post-bortezomib administration, ?5 and ?5i
activities were largely restored, whereas inhibition of ?1i activity was
sustained. Clinically, after three cycles, cardiac function had improved, with
concurrent improvement of haemodynamic stability during haemodialysis.
Anti-ds-DNA dropped from >400 to 12?IU/mL along with normalisation of complement
C3 and C4. Bortezomib therapy was well tolerated, and patient now has a sustained
remission for >16?months. CONCLUSIONS: This case illustrates the potential
benefit of pharmacodynamic monitoring of (immune)proteasome subunit-specific
activity after bortezomib dosing in patients with therapy refractory SLE. This
tool may hold potential to guide personalised/precision dosing aiming to achieve
maximal efficacy and minimal toxicity.