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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Surg+Pathol
2016 ; 40
(9
): 1232-42
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Clearance of Hepatic Sphingomyelin by Olipudase Alfa Is Associated With
Improvement in Lipid Profiles in Acid Sphingomyelinase Deficiency
#MMPMID27340749
Thurberg BL
; Wasserstein MP
; Jones SA
; Schiano TD
; Cox GF
; Puga AC
Am J Surg Pathol
2016[Sep]; 40
(9
): 1232-42
PMID27340749
show ga
Acid sphingomyelinase deficiency (ASMD; Niemann-Pick disease type A and B) is a
lysosomal storage disorder characterized by abnormal intracellular sphingomyelin
(SM) accumulation. Prominent liver involvement results in hepatomegaly,
fibrosis/cirrhosis, abnormal liver chemistries, and a proatherogenic lipid
profile. Olipudase alfa (recombinant human ASM) is in clinical development as an
investigational enzyme replacement therapy for the non-neurological
manifestations of ASMD. In a phase 1b study conducted to evaluate the safety and
tolerability of within-patient dose escalation with olipudase alfa, measurement
of SM levels in liver biopsies was used as a pharmacodynamic biomarker of
substrate burden. Five adult patients with non neuronopathic ASMD received
escalating doses of olipudase alfa every 2 weeks for 26 weeks. Liver biopsies
obtained at baseline and 26 weeks after treatment were evaluated for SM storage
by histomorphometric analysis, biochemistry, and electron microscopy. Biopsies
were also assessed for inflammation and fibrosis, and for the association of SM
levels with liver volume, liver function tests, and lipid profiles. At baseline,
SM storage present in Kupffer cells and hepatocytes ranged from 9.8% to 53.8% of
the microscopic field. After 26 weeks of treatment, statistically significant
reductions in SM (P<0.0001) measured by morphometry were seen in 4 patients with
evaluable liver biopsies. The 26-week biopsy of the fifth patient was
insufficient for morphometric quantitation. Posttreatment SM levels ranged from
1.2% to 9.5% of the microscopic field, corresponding to an 84% to 92% relative
reduction from baseline. Improvements in liver volume, liver function tests, and
lipid profiles were also observed. This study illustrates the utility of SM
assessment by liver biopsy as a pharmacodynamic biomarker of disease burden in
these patients.
|Adult
[MESH]
|Aged
[MESH]
|Dose-Response Relationship, Drug
[MESH]
|Female
[MESH]
|Humans
[MESH]
|Image Interpretation, Computer-Assisted
[MESH]
|Immunohistochemistry
[MESH]
|Liver/drug effects/*metabolism/pathology
[MESH]
|Male
[MESH]
|Microscopy, Electron, Transmission
[MESH]
|Middle Aged
[MESH]
|Niemann-Pick Disease, Type A/*drug therapy
[MESH]
|Niemann-Pick Disease, Type B/*drug therapy
[MESH]
|Recombinant Proteins/*therapeutic use
[MESH]
|Sphingomyelin Phosphodiesterase/*therapeutic use
[MESH]