Program in Molecular Medicine
Biochemical Phenomena, Metabolism, and Nutrition | Cell and Developmental Biology | Cellular and Molecular Physiology | Congenital, Hereditary, and Neonatal Diseases and Abnormalities | Enzymes and Coenzymes | Lipids | Musculoskeletal Diseases | Musculoskeletal System | Nutritional and Metabolic Diseases
Lysosomal acid lipase (LAL) is essential for cholesteryl ester (CE) and triacylglycerol (TAG) hydrolysis in the lysosome. Clinically, an autosomal recessive LIPA mutation causes LAL deficiency (LALD), previously described as Wolman Disease or Cholesteryl Ester Storage Disease (CESD). LAL-D is associated with ectopic lipid accumulation in the liver, small intestine, spleen, adrenal glands, and blood. Considering the importance of unesterified cholesterol and fatty acids in bone metabolism, we hypothesized that LAL is essential for bone formation, and ultimately, skeletal health. To investigate the role of LAL in skeletal homeostasis, we used LAL-deficient ((-/-)) mice, in vitro osteoblast cultures, and novel clinical data from LAL-D patients. Both male and female LAL(-/-) mice demonstarted lower trabecular and cortical bone parameters , which translated to reduced biomechanical properties. Further histological analyses revealed that LAL(-/-) mice had fewer osteoblasts, with no change in osteoclast or marrow adipocyte numbers. In studying the cell-autonomous role of LAL, we observed impaired differentiation of LAL(-/-) calvarial osteoblasts and in bone marrow stromal cells treated with the LAL inhibitor lalistat. Consistent with LAL's role in other tissues, lalistat resulted in profound lipid puncta accumulation and an altered intracellular lipid profile. Finally, we analyzed a large de-identified national insurance database (i.e. 2016/2017 Optum Clinformatics(R)) which revealed that adults ( > /=18 years) with CESD (n = 3076) had a higher odds ratio (OR = 1.21; 95% CI = 1.03-1.41) of all-cause fracture at any location compared to adults without CESD (n = 13.7 M) after adjusting for demographic variables and osteoporosis. These data demonstrate that alterations in LAL have significant clinical implications related to fracture risk and that LAL's modulation of lipid metabolism is a critical for osteoblast function.
Bone, Cholesterol, Lipid, Lipophagy, Metabolism, Osteoblast, Skeleton
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© 2021 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
DOI of Published Version
Helderman RC, Whitney DG, Duta-Mare M, Akhmetshina A, Vujic N, Jayapalan S, Nyman JS, Misra BB, Rosen CJ, Czech MP, Kratky D, Rendina-Ruedy E. Loss of function of lysosomal acid lipase (LAL) profoundly impacts osteoblastogenesis and increases fracture risk in humans. Bone. 2021 Jul;148:115946. doi: 10.1016/j.bone.2021.115946. Epub 2021 Apr 7. PMID: 33838322; PMCID: PMC8108562. Link to article on publisher's site
Helderman RC, Whitney DG, Duta-Mare M, Akhmetshina A, Vujic N, Jayapalan S, Nyman JS, Misra BB, Rosen CJ, Czech MP, Kratky D, Rendina-Ruedy E. (2021). Loss of function of lysosomal acid lipase (LAL) profoundly impacts osteoblastogenesis and increases fracture risk in humans. Open Access Publications by UMMS Authors. https://doi.org/10.1016/j.bone.2021.115946. Retrieved from https://escholarship.umassmed.edu/oapubs/4672
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Biochemical Phenomena, Metabolism, and Nutrition Commons, Cell and Developmental Biology Commons, Cellular and Molecular Physiology Commons, Congenital, Hereditary, and Neonatal Diseases and Abnormalities Commons, Enzymes and Coenzymes Commons, Lipids Commons, Musculoskeletal Diseases Commons, Musculoskeletal System Commons, Nutritional and Metabolic Diseases Commons