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  1. Article: Organoid Technology and Its Role for Theratyping Applications in Cystic Fibrosis.

    Conti, Jessica / Sorio, Claudio / Melotti, Paola

    Children (Basel, Switzerland)

    2022  Volume 10, Issue 1

    Abstract: Cystic fibrosis (CF) is a autosomal recessive, multisystemic disease caused by different mutations in the CFTR gene encoding CF transmembrane conductance regulator. Although symptom management is important to avoid complications, the approval of CFTR ... ...

    Abstract Cystic fibrosis (CF) is a autosomal recessive, multisystemic disease caused by different mutations in the CFTR gene encoding CF transmembrane conductance regulator. Although symptom management is important to avoid complications, the approval of CFTR modulator drugs in the clinic has demonstrated significant improvements by targeting the primary molecular defect of CF and thereby preventing problems related to CFTR deficiency or dysfunction. CFTR modulator therapies have positively changed the patients' quality of life, especially for those who start their use at the onset of the disease. Due to early diagnosis with the implementation of newborn screening programs and considerable progress in the treatment options, nowadays pediatric mortality was dramatically reduced. In any case, the main obstacle to treat CF is to predict the drug response of patients due to genetic complexity and heterogeneity. Advances in 3D culture systems have led to the extrapolation of disease modeling and individual drug response in vitro by producing mini organs called "organoids" easily obtained from nasal and rectal mucosa biopsies. In this review, we focus primarily on patient-derived intestinal organoids used as in vitro model for CF disease. Organoids combine high-validity of outcomes with a high throughput, thus enabling CF disease classification, drug development and treatment optimization in a personalized manner.
    Language English
    Publishing date 2022-12-20
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2732685-8
    ISSN 2227-9067
    ISSN 2227-9067
    DOI 10.3390/children10010004
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Functional rescue of CFTR in rectal organoids from patients carrying R334W variant by CFTR modulators and PDE4 inhibitor Roflumilast.

    Latorre, Roberta Valeria / Calicchia, Martina / Bigliardi, Martina / Conti, Jessica / Kleinfelder, Karina / Melotti, Paola / Sorio, Claudio

    Respiratory investigation

    2024  Volume 62, Issue 3, Page(s) 455–461

    Abstract: Background: Many disease-causing variants in the Cystic Fibrosis Transmembrane conductance Regulator (CFTR) gene remain uncharacterized and untreated. Restoring the function of the impaired CFTR protein is the goal of personalized medicine, particularly ...

    Abstract Background: Many disease-causing variants in the Cystic Fibrosis Transmembrane conductance Regulator (CFTR) gene remain uncharacterized and untreated. Restoring the function of the impaired CFTR protein is the goal of personalized medicine, particularly in patients carrying rare CFTR variants. In this study, functional defects related to the rare R334W variant were evaluated after treatment with CFTR modulators or Roflumilast, a phosphodiesterase-4 inhibitor (PDE4i).
    Methods: Rectal organoids from subjects with R334W/2184insA and R334W/2183AA > G genotypes were used to perform the Forskolin-induced swelling (FIS) assay. Organoids were left drug-untreated or treated with modulators VX-770 (I), VX-445 (E), and VX-661 (T) mixed, and their combination (ETI). Roflumilast (R) was used alone or as a combination of I + R.
    Results: Our data show a significant increase in FIS rate following treatment with I alone. The combined use of modulators, such as ETI, did not increase further swelling than I alone, nor in protein maturation. Treatment with R shows an increase in FIS response similar to those of I, and the combination R + I significantly increases the rescue of CFTR activity.
    Conclusions: Equivalent I and ETI treatment efficacy was observed for both genotypes. Furthermore, significant organoid swelling was observed with combined I + R used that supports the recently published data describing a potentiating effect of only I in patients carrying the variant R334W and, at the same time, corroborating the role of strategies that include PDE4 inhibitors further to potentiate the effect of I for this variant.
    MeSH term(s) Humans ; Cystic Fibrosis Transmembrane Conductance Regulator/genetics ; Cystic Fibrosis Transmembrane Conductance Regulator/metabolism ; Cystic Fibrosis Transmembrane Conductance Regulator/pharmacology ; Cystic Fibrosis/genetics ; Cystic Fibrosis/metabolism ; Phosphodiesterase 4 Inhibitors/pharmacology ; Phosphodiesterase 4 Inhibitors/metabolism ; Colforsin/metabolism ; Colforsin/pharmacology ; Organoids/metabolism ; Mutation ; Aminopyridines ; Benzamides ; Cyclopropanes
    Chemical Substances Cystic Fibrosis Transmembrane Conductance Regulator (126880-72-6) ; Phosphodiesterase 4 Inhibitors ; Roflumilast (0P6C6ZOP5U) ; Colforsin (1F7A44V6OU) ; CFTR protein, human ; Aminopyridines ; Benzamides ; Cyclopropanes
    Language English
    Publishing date 2024-03-27
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2660821-2
    ISSN 2212-5353 ; 2212-5345
    ISSN (online) 2212-5353
    ISSN 2212-5345
    DOI 10.1016/j.resinv.2024.03.003
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  3. Article ; Online: Revisiting the Role of Leukocytes in Cystic Fibrosis.

    Averna, Monica / Melotti, Paola / Sorio, Claudio

    Cells

    2021  Volume 10, Issue 12

    Abstract: Cystic fibrosis in characterized by pulmonary bacterial colonization and hyperinflammation. Lymphocytes, monocytes/macrophages, neutrophils, and dendritic cells of patients with CF express functional CFTR and are directly affected by altered CFTR ... ...

    Abstract Cystic fibrosis in characterized by pulmonary bacterial colonization and hyperinflammation. Lymphocytes, monocytes/macrophages, neutrophils, and dendritic cells of patients with CF express functional CFTR and are directly affected by altered CFTR expression/function, impairing their ability to resolve infections and inflammation. However, the mechanism behind and the contribution of leukocytes in the pathogenesis of CF are still poorly characterized. The recent clinical introduction of specific CFTR modulators added an important tool not only for the clinical management of the disease but also to the investigation of the pathophysiological mechanisms related to CFTR dysfunction and dysregulated immunity. These drugs treat the basic defect in cystic fibrosis (CF) by increasing CFTR function with improvement of lung function and quality of life, and may improve clinical outcomes also by correcting the dysregulated immune function that characterizes CF. Measure of CFTR function, protein expression profiling and several omics methods were used to identify molecular changes in freshly isolated leukocytes of CF patients, highlighting two roles of leukocytes in CF: one more generally related to the mechanism(s) causing immune dysregulation in CF and unresolved inflammation, and another more applicative role, which identifies in myeloid cells, an important tool predictive of the therapeutic response of CF patients. In this review we will summarize available data on CFTR expression and function in leukocyte populations and will discuss potential clinical applications based on available data.
    MeSH term(s) Animals ; Clinical Trials as Topic ; Cystic Fibrosis/pathology ; Cystic Fibrosis Transmembrane Conductance Regulator/metabolism ; Humans ; Leukocytes/pathology ; Models, Biological
    Chemical Substances Cystic Fibrosis Transmembrane Conductance Regulator (126880-72-6)
    Language English
    Publishing date 2021-12-01
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells10123380
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Theratyping of the Rare CFTR Genotype A559T in Rectal Organoids and Nasal Cells Reveals a Relevant Response to Elexacaftor (VX-445) and Tezacaftor (VX-661) Combination.

    Kleinfelder, Karina / Villella, Valeria Rachela / Hristodor, Anca Manuela / Laudanna, Carlo / Castaldo, Giuseppe / Amato, Felice / Melotti, Paola / Sorio, Claudio

    International journal of molecular sciences

    2023  Volume 24, Issue 12

    Abstract: Despite the promising results of new CFTR targeting drugs designed for the recovery of F508del- and class III variants activity, none of them have been approved for individuals with selected rare mutations, because uncharacterized CFTR variants lack ... ...

    Abstract Despite the promising results of new CFTR targeting drugs designed for the recovery of F508del- and class III variants activity, none of them have been approved for individuals with selected rare mutations, because uncharacterized CFTR variants lack information associated with the ability of these compounds in recovering their molecular defects. Here we used both rectal organoids (colonoids) and primary nasal brushed cells (hNEC) derived from a CF patient homozygous for A559T (c.1675G>A) variant to evaluate the responsiveness of this pathogenic variant to available CFTR targeted drugs that include VX-770, VX-809, VX-661 and VX-661 combined with VX-445. A559T is a rare mutation, found in African-Americans people with CF (PwCF) with only 85 patients registered in the CFTR2 database. At present, there is no treatment approved by FDA (U.S. Food and Drug Administration) for this genotype. Short-circuit current (Isc) measurements indicate that A559T-CFTR presents a minimal function. The acute addition of VX-770 following CFTR activation by forskolin had no significant increment of baseline level of anion transport in both colonoids and nasal cells. However, the combined treatment, VX-661-VX-445, significantly increases the chloride secretion in A559T-colonoids monolayers and hNEC, reaching approximately 10% of WT-CFTR function. These results were confirmed by forskolin-induced swelling assay and by western blotting in rectal organoids. Overall, our data show a relevant response to VX-661-VX-445 in rectal organoids and hNEC with CFTR genotype A559T/A559T. This could provide a strong rationale for treating patients carrying this variant with VX-661-VX-445-VX-770 combination.
    MeSH term(s) Humans ; Cystic Fibrosis Transmembrane Conductance Regulator/genetics ; Cystic Fibrosis/genetics ; Colforsin/therapeutic use ; Benzodioxoles/pharmacology ; Mutation ; Organoids ; Genotype
    Chemical Substances elexacaftor (RRN67GMB0V) ; Cystic Fibrosis Transmembrane Conductance Regulator (126880-72-6) ; tezacaftor ; ivacaftor (1Y740ILL1Z) ; Colforsin (1F7A44V6OU) ; Benzodioxoles ; CFTR protein, human
    Language English
    Publishing date 2023-06-19
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms241210358
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Genomic characterization of

    Veschetti, Laura / Sandri, Angela / Patuzzo, Cristina / Melotti, Paola / Malerba, Giovanni / Lleo, Maria M

    Microbial genomics

    2021  Volume 7, Issue 7

    Abstract: ... ...

    Abstract Achromobacter
    MeSH term(s) Achromobacter/classification ; Achromobacter/genetics ; Achromobacter/isolation & purification ; Cystic Fibrosis/microbiology ; Drug Resistance, Bacterial/genetics ; Genome, Bacterial/genetics ; Gram-Negative Bacterial Infections/microbiology ; Humans ; Lung/microbiology ; MutS Proteins/genetics ; Persistent Infection/microbiology ; Virulence Factors/genetics ; Whole Genome Sequencing ; beta-Lactamases/genetics
    Chemical Substances Virulence Factors ; beta-lactamase OXA-2 (EC 3.5.2.-) ; beta-Lactamases (EC 3.5.2.6) ; MutS Proteins (EC 3.6.1.3)
    Language English
    Publishing date 2021-07-22
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2835258-0
    ISSN 2057-5858 ; 2057-5858
    ISSN (online) 2057-5858
    ISSN 2057-5858
    DOI 10.1099/mgen.0.000606
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Mobilome Analysis of

    Veschetti, Laura / Sandri, Angela / Patuzzo, Cristina / Melotti, Paola / Malerba, Giovanni / Lleò, Maria M

    Microorganisms

    2021  Volume 9, Issue 1

    Language English
    Publishing date 2021-01-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2720891-6
    ISSN 2076-2607
    ISSN 2076-2607
    DOI 10.3390/microorganisms9010130
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  7. Article ; Online: In Vivo Inflammation Caused by

    Sandri, Angela / Saitta, Giulia Maria / Veschetti, Laura / Boschi, Federico / Passarelli Mantovani, Rebeca / Carelli, Maria / Melotti, Paola / Signoretto, Caterina / Boaretti, Marzia / Malerba, Giovanni / Lleò, Maria M

    International journal of molecular sciences

    2023  Volume 24, Issue 8

    Abstract: ... ...

    Abstract Achromobacter
    MeSH term(s) Humans ; Mice ; Animals ; Cystic Fibrosis/microbiology ; Achromobacter/genetics ; Lung/microbiology ; Pneumonia/complications ; Inflammation/complications ; Mice, Knockout
    Language English
    Publishing date 2023-04-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms24087432
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  8. Article ; Online: CFTR Modulators Rescue the Activity of CFTR in Colonoids Expressing the Complex Allele p.[R74W;V201M;D1270N]/dele22_24.

    Kleinfelder, Karina / Somenza, Elena / Farinazzo, Alessia / Conti, Jessica / Lotti, Virginia / Latorre, Roberta Valeria / Rodella, Luca / Massella, Arianna / Tomba, Francesco / Bertini, Marina / Sorio, Claudio / Melotti, Paola

    International journal of molecular sciences

    2023  Volume 24, Issue 6

    Abstract: An Italian, 46-year-old female patient carrying the complex allele p.[R74W;V201M;D1270N] in trans with CFTR dele22_24 was diagnosed at the Cystic Fibrosis (CF) Center of Verona as being affected by CF-pancreatic sufficient (CF-PS) in 2021. The variant ... ...

    Abstract An Italian, 46-year-old female patient carrying the complex allele p.[R74W;V201M;D1270N] in trans with CFTR dele22_24 was diagnosed at the Cystic Fibrosis (CF) Center of Verona as being affected by CF-pancreatic sufficient (CF-PS) in 2021. The variant V201M has unknown significance, while both of the other variants of this complex allele have variable clinical consequences, according to the CFTR2 database, with reported clinical benefits for treatment with ivacaftor + tezacaftor and ivacaftor + tezacaftor + elexacaftor in patients carrying the R74W-D1270N complex allele, which are currently approved (in USA, not yet in Italy). She was previously followed up by pneumologists in northern Italy because of frequent bronchitis, hemoptysis, recurrent rhinitis,
    MeSH term(s) Female ; Humans ; Middle Aged ; Cystic Fibrosis Transmembrane Conductance Regulator/genetics ; Cystic Fibrosis Transmembrane Conductance Regulator/metabolism ; Alleles ; Colforsin/therapeutic use ; Mutation ; Cystic Fibrosis/drug therapy ; Cystic Fibrosis/genetics ; Benzodioxoles/pharmacology ; Benzodioxoles/therapeutic use
    Chemical Substances Cystic Fibrosis Transmembrane Conductance Regulator (126880-72-6) ; ivacaftor (1Y740ILL1Z) ; Colforsin (1F7A44V6OU) ; Benzodioxoles ; CFTR protein, human
    Language English
    Publishing date 2023-03-08
    Publishing country Switzerland
    Document type Case Reports
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms24065199
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  9. Article ; Online: Role of sweat ion ratios in diagnosing cystic fibrosis.

    Treggiari, Davide / Tridello, Gloria / Menin, Laura / Borruso, Antonella / Pintani, Emily / Iansa, Patrizia / Cipolli, Marco / Melotti, Paola

    Pediatric pulmonology

    2021  Volume 56, Issue 7, Page(s) 2023–2028

    Abstract: Sweat chloride ( ... ...

    Abstract Sweat chloride (Cl
    MeSH term(s) Chlorides ; Cystic Fibrosis/diagnosis ; Cystic Fibrosis Transmembrane Conductance Regulator ; Humans ; Retrospective Studies ; Sodium ; Sweat
    Chemical Substances Chlorides ; Cystic Fibrosis Transmembrane Conductance Regulator (126880-72-6) ; Sodium (9NEZ333N27)
    Language English
    Publishing date 2021-04-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 632784-9
    ISSN 1099-0496 ; 8755-6863
    ISSN (online) 1099-0496
    ISSN 8755-6863
    DOI 10.1002/ppul.25395
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  10. Article ; Online: CFTR function is impaired in a subset of patients with pancreatitis carrying rare CFTR variants.

    Angyal, Dora / Kleinfelder, Karina / Ciciriello, Fabiana / Groeneweg, Tessa A / De Marchi, Giulia / de Pretis, Nicolò / Bernardoni, Laura / Rodella, Luca / Tomba, Francesco / De Angelis, Paola / Surace, Cecilia / Pintani, Emily / Alghisi, Federico / de Jonge, Hugo R / Melotti, Paola / Sorio, Claudio / Lucidi, Vincenzina / Bijvelds, Marcel J C / Frulloni, Luca

    Pancreatology : official journal of the International Association of Pancreatology (IAP) ... [et al.

    2024  Volume 24, Issue 3, Page(s) 394–403

    Abstract: Background: Many affected by pancreatitis harbor rare variants of the cystic fibrosis (CF) gene, CFTR, which encodes an epithelial chloride/bicarbonate channel. We investigated CFTR function and the effect of CFTR modulator drugs in pancreatitis ... ...

    Abstract Background: Many affected by pancreatitis harbor rare variants of the cystic fibrosis (CF) gene, CFTR, which encodes an epithelial chloride/bicarbonate channel. We investigated CFTR function and the effect of CFTR modulator drugs in pancreatitis patients carrying CFTR variants.
    Methods: Next-generation sequencing was performed to identify CFTR variants. Sweat tests and nasal potential difference (NPD) assays were performed to assess CFTR function in vivo. Intestinal current measurement (ICM) was performed on rectal biopsies. Patient-derived intestinal epithelial monolayers were used to evaluate chloride and bicarbonate transport and the effects of a CFTR modulator combination: elexacaftor, tezacaftor and ivacaftor (ETI).
    Results: Of 32 pancreatitis patients carrying CFTR variants, three had CF-causing mutations on both alleles and yielded CF-typical sweat test, NPD and ICM results. Fourteen subjects showed a more modest elevation in sweat chloride levels, including three that were provisionally diagnosed with CF. ICM indicated impaired CFTR function in nine out of 17 non-CF subjects tested. This group of nine included five carrying a wild type CFTR allele. In epithelial monolayers, a reduction in CFTR-dependent chloride transport was found in six out of 14 subjects tested, whereas bicarbonate secretion was reduced in only one individual. In epithelial monolayers of four of these six subjects, ETI improved CFTR function.
    Conclusions: CFTR function is impaired in a subset of pancreatitis patients carrying CFTR variants. Mutations outside the CFTR locus may contribute to the anion transport defect. Bioassays on patient-derived intestinal tissue and organoids can be used to detect such defects and to assess the effect of CFTR modulators.
    MeSH term(s) Humans ; Bicarbonates/metabolism ; Chlorides ; Cystic Fibrosis/genetics ; Cystic Fibrosis Transmembrane Conductance Regulator/genetics ; Mutation ; Pancreatitis/genetics ; Pancreatitis/metabolism ; Quinolones
    Chemical Substances Bicarbonates ; CFTR protein, human ; Chlorides ; Cystic Fibrosis Transmembrane Conductance Regulator (126880-72-6) ; ivacaftor (1Y740ILL1Z) ; Quinolones
    Language English
    Publishing date 2024-03-10
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2056680-3
    ISSN 1424-3911 ; 1424-3903
    ISSN (online) 1424-3911
    ISSN 1424-3903
    DOI 10.1016/j.pan.2024.03.005
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