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9
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Carbohydrate-Based Therapeutics forLysosomal
Storage Disorders
Camilla Matassini, Francesca Clemente, and Francesca Cardona
Department of Chemistry “U. Schiff” (DICUS), University of Florence, via della Lastruccia 3-13, 50019 Sesto F.no (FI), Italy
9.1 An Introduction to Lysosomal Storage Disorders (LSDs)
Lysosomal Storage Disorders (LSDs) are a group of 70 inherited metabolic disorders[1] that affect the function of the lysosome, a membranebound organelle with a key role in processes involved in degrading and recycling cellular waste, cel­lular signaling, and energy metabolism[2]. LSDs are monogenic disorders caused by the mutation in a gene encoding for a lysosomal protein (such as lysosomal gly­cosidases, proteases, integral membrane proteins, transporters, enzyme modifiers, or activators), resulting in lysosomal failure and subsequent accumulation of non metabolized substrates. This steady accumulation of substrates in the lysosome, the “storage,” hence the name of these disorders, ultimately leads to cell dysfunction and cell death (Figure9.1).
LSDs are considered a class of genetically and clinically heterogeneous disorders, even though some common clinical features, such as a pediatric onset and the enlargement of abdominal organs, mainly liver and spleen (visceromegaly), can be identified. Other frequent symptoms, related to the specific genetic mutation and the consequent stored substrate, are skeletal dysmorphia, developmental delay, or other central nervous system (CNS) deficits. Diagnosis of LSDs is based on clinical symptoms and subsequent confirmation with biochemical and genetic tests, such as enzymatic dosage and gene sequencing[3]. Unfortunately, especially for the less severe forms with longer survival, the overlapping clinical features that are not spe­cific for LSDs lead to considerable diagnostic delay and missed cases, while early diagnosis is a priority for the application of new diseasemodifying therapies.
245
Carbohydrate-Based Therapeutics, First Edition. Edited by Roberto Adamo and Luigi Lay. © 2024 WILEY-VCH GmbH. Published 2024 by WILEY-VCH GmbH.
 
Normal ly
Diseased
Elimination
246
sosome
Breakdown
Recycled
lysosome
Substrate
accumulation
Tissue/organ damage
and
diesease symptoms
Figure9.1 Comparison of a healthy lysosome with a defective one of LSD patients: the genetic mutation results in lysosome failure, hampering the breakdown and recycling of macromolecules and leading to tissue and organ dysfunctions with consequent disease symptoms.
Epidemiology and diagnosis of LSDs, as well as challenges for the screening of car­riers, highrisk and newborn populations have been carefully reviewed by Wijburg and coworkers[4].
Information about the incidence of LSDs is relatively limited. However, although rare if taken individually (one case per 50 000–250 000individuals), they are com­mon as a group, with an estimated incidence of 1in 5000–5500live births[5]. The most common LSDs are Fabry, Gaucher, and Pompe diseases (PDs), with up to 2–2.5 cases per 100 000individuals [6]. Moreover, despite a general low occurrence of individual LSDs, the incidence may be higher in specific ethnicities, such as in the case of Gaucher disease (GD), for which a frequency of 1 in 500 to 1in 1000 is observed among Ashkenazi Jews[7].
LSDs related to enzyme deficiencies, which are the focus of this chapter, can be subclassified according to the stored materials (see Table9.1):
1- Mucopolysaccharidoses (MPS) (such as MPS I, II, III e IVA) 2- Sphingolipidoses (such as Fabry, Niemann–Pick (NP) and GD, GM1 and
GM2gangliosidosis, and Krabbe disease (KD)) 3- Glycogen Storage Disorders (namely, Pompe disease) 4- Glycoproteinoses (such as αMannosidosis and Fucosidosis)
Each disease can be in turn classified into different types based on symptoms, affected organs, and age of onset, such as congenital or infantile (which usually have the most severe presentation), lateinfantile, juvenile, and adult types.
       
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Table9.1 Lysosomal storage disorders object ofthis chapter, classified according tothe stored material: foreach disorder thename(s), thedeficient enzyme, and theapproved
therapy are listed.
Approved
Disease Deficient lysosomal enzyme
therapies
Mucopolysaccharidoses (MPS) MPS I: Hurler syndrome αiduronidase HSCT, ERT MPS II: Hunter syndrome Iduronate2sulfatase (IDS) ERT MPS IIIA: Sanfilippo
Nsulfoglucosamine sulfohydrolase NONE
a
syndrome A MPS IIIB: Sanfilippo
Nacetylαglucosaminidase (NAGLU) NONE
a
syndrome B MPS IIIC (Sanfilippo
syndrome) MPS IIID (Sanfilippo
Acetyl CoA glucosamine
Nacetyltransferase Nacetylglucosamine6sulfatase NONE
NONE
a
a
syndrome) MPS IVA: Morquio syndrome N‐acetylgalactosamine6sulfatase
ERT
(GALNS)
MPS IVB (Morquio B syndrome)
b
MPS VI (Maroteaux–Lamy
βgalactosidase NONE
Arylsulfatase B ERT
a
syndrome) MPS VII (Sly syndrome) βglucuronidase ERT MPS IX Hyaluronidase NONE
a
Sphingolipidoses Fabry disease αgalactosidase A ERT, PCT Gaucher disease βglucocerebrosidase, also known as
ERT, SRT
acid βglucosidase (GCase)
Niemann–Pick Sphingomyelindegrading enzyme acid
ERT sphingomyelinase and cholesterol transport proteins
GM1gangliosidosis βgalactosidase NONE GM2gagliosidosis: Tay–Sachs
βhexosaminidase NONE
a
a
disease and Sandhoff disease Krabbe disease Galactosylceramidase HSCT Glycogen storage disease Pompe disease αglucosidase ERT Glycoproteinoses Fucosidosis αfucosidase NONE
a
αmannosidosis αmannosidase ERT
247
a) “NONE” means that only symptomatic and supportive therapies are provided to patients. b) Being βgalactosidase the deficient enzyme in MPS IVB, this disorder will be discussed together with GM1 (Sphingolipidoses section) instead of in the Mucopolysaccharidoses section. ERT, enzyme replacement therapy; SRT, substrate reduction therapy; PCT, pharmacological chaperone therapy.
 
248
9.2 Available Treatments for LSDs: The Role of
Carbohydrate-Based Therapeutics
The promulgation of U.S. Orphan Drug Act (ODA) in 1983, followed by analogous “orphan” legislation in other countries, undoubtedly stimulated the investments in novel therapies for rare conditions, including LSDs, that otherwise would not be profitable due to the small target population[8]. The consequently growing under­standing of the pathophysiology of LSDs reached in the last decades, allowed to identify various potential clinical intervention points, thus developing innovative therapies, some of which passed all the steps from preclinical stage to regulatory approval, and they were ultimately made available for patients. The most relevant therapeutic approaches for LSDs are briefly described below.
The first treatment of an LSD, which showed any success was the hematopoietic stem cell transplantation (HSCT) in a oneyearold MPS I patient, in 1981[9]. In particular, the transplanted bone marrowderived cells with normal enzyme levels were thought to donate enzymes to the patient’s deficient cells[10]. Unfortunately, this therapy resulted efficient only in MPS I patients younger than nine months of age, and presents important issues related to donor selection and adverse effects of transplantation[11, 12]. HSCT is currently the standard care for MPS I younger patients, despite the high risks of mortality, and it has been also used for other LSDs without available treatments, such as KD[1].
Recently, gene therapy methods, such as gene replacement, antisense oligonu­cleotide (ASO) therapies, or gene editing, are also emerging for the treatment of LSDs[13–15].
In particular, some variants of adenoassociated virus (AAV) resulted in excellent vectors to deliver the gene encoding the deficient enzymes to cells[16]. Once manu­factured for human use, the vector can be directly infused into the bloodstream or target organs (direct gene transfer) or it can be applied ex‐vivo to stem cells in culture and subsequently reimplanted into the donor (indirect gene transfer) [1]. These cuttingedge therapies, all still in clinical trials for very few disorders, seem to be effective in achieving remission of neurological manifestations. However, the major drawbacks are related to establishing safe administration regime, the invasive route of administration, and the difficulty of foreseeing longterm undesired effects[17].
Enzyme replacement therapy (ERT) consists of intravenous infusion of a recom­binant wildtype enzyme, which enters the cell through membrane receptors (typi­cally the mannose6phosphate receptor (M6PR)) and replaces the catalytic action of the mutated lysosomal enzyme[18, 19]. Available since 1996[20], ERT is the only treatment approved for many LSDs (Table9.1). The main limitations associated with ERT are its high cost, possible immunologic response, and frequent hospitali­zation of patients, which have been now partially overcome with domiciliary treat­ments. In addition, the recombinant enzymes used are not able to cross the blood–brain barrier (BBB) and reach the CNS, so that ERT lacks efficacy in neu­ronopathic forms of disorders.
The aim of the substrate reduction therapy (SRT) is to reduce the storage in the lysosomes of undegraded substrates by using small molecules able to inhibit their
9.2 Available Treatments for LSDs: The Role of Carbohydrate-Based Therapeutics
macological
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biosynthesis[21]. SRT could be in principle developed for all LSDs, but, to date, is approved for Gaucher and NP diseases only, because, for these glycosphingolipids, the knowledge of their biosynthetic pathways allowed to identify specific inhibitors of the enzyme that synthesizes the substrates or one of their precursors.
Although trials in other glycosphingolipids and MPS are ongoing, the limitation to very few pathologies represents the main drawback of SRT. In addition, SRT has a slower efficacy than ERT and several side effects or complications, such as diar­rhea, flatulence, abdominal pain, or weight loss.
In several LSDs, gene mutations result in lysosomal enzymes prone to a rapid turnover or with a reduced catalytic activity [22]. However, since the substrate accumulation occurs when residual enzyme activity decays below a certain thresh­old, a small improvement in the enzyme activity can be sufficient to slow down the disease progression and to ameliorate clinical evidence. This is the concept on which the pharmacological chaperone therapy (PCT) is based: it employs small molecules (pharmacological chaperones, PCs) able to stabilize the tertiary struc­ture of the mutant enzyme, thus improving its catalytic activity and reducing the storage in the lysosomes (Figure9.2).
The main advantages of PCs are their lowcost, the oral administration, and the possibility to cross the BBB exerting their action on the CNS[23].
Several PCs were designed and synthesized based on the structure of the natural substrate or alternatively identified by highthroughput screening (HTS) studies. To date, the only PC that reached the drug market is Migalastat (Galafold®, Amicus
249
Lysosome
Golgi
Stabilized
protein
ER
Figure9.2 Cartoon representing the Pharmacological Chaperone (PC) concept. Source: Reproduced with permission from Boyd etal.[23]. © 2013 American Chemical Society
Publications.
PC
Misfolded
protein
Phar
chaperone (PC)
ERAD
Autophagy
 
250
Therapeutics)[24, 25] for the treatment of Fabry disease (FD), but many other compounds showed encouraging results in preclinical studies for the treatment of other LSDs, including GD, Pompe disease, or gangliosidosis.
Surprisingly, except for cellbased therapies (both the oldest bone marrow trans­plantation and the emerging gene therapy), the most currently employed treat­ments, namely ERT, SRT, and PCT, all involve the use of iminosugars, sugar analogs with a nitrogen replacing the endocyclic oxygen atom[26].
Iminosugars have been isolated from natural sources, including plants and micro­organisms, for over 50 years. A great effort for their total synthesis has been pursued by many researchers all around the world. For their synthesis, which is very chal­lenging due to the presence of several contiguous stereocenters with a welldefined configuration, both chiral pool strategies and enantioselective syntheses have been developed[27–33].
Their resemblance to carbohydrates allows them to be recognized by, and interact with carbohydrate receptors. In particular, iminosugars have been extensively inves­tigated in the last 30 years as glycosidase [34–36] and glycosyltransferase inhibitors[37–41].
They are more chemically and metabolically stable than their parent sugars, are highly water soluble, can cross the BBB, and are normally excreted from the body unmodified. Such properties distinguish them from other small polar molecules and provide significant advantages for their use as drugs, especially in the treatment of LSDs.
9.2.1 Enzyme Replacement Therapy (ERT)
In the 1980s the ingestion of plants belonging to the Leguminosae family was con­sidered responsible for inducing lysosomal storage diseases in animals (e.g. swain­sona toxicosis [42] or locoweed poisoning[43]) because of their high content of iminosugars able to inhibit lysosomal glycosidases.
The observation that the endogenous enzyme activity was restored when the inhibitor was removed[44] suggested that the lysosomal storage caused by the defi­cient enzyme in human LSD patients could be faced by supplying a natural or recombinant functional enzyme, thus paving the way for the introduction of the ERT.
ERT is based on the replacement of the mutated protein with normal protein to restore its wildtype function. Although initially purified from human tissues, now­adays the deficient enzymes are produced by recombinant DNA technology. Mammalderived cells, such as Chinese Hamster Ovary (CHO) cells, are the most widely used platform to produce ERT recombinant enzymes[45].
After their efficacy and safety have been confirmed by clinical trials, to date, there are 10 approved therapeutic enzymes as ERT for 7LSDs (Table9.1). Nevertheless, there are some drawbacks related to this therapy, such as immune reactions, low efficiency of lysosomal targeting, and difficulty reaching CNS. To overcome these limitations, several strategies have been developed with the aim of increasing the targeting efficiency and the ability to cross the BBB. Many of these approaches