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  1. Article: [THE BIG CHALLENGES OF PEDIATRIC NEPHROLOGY AT THE OUTSET OF THE THIRD DECADE OF THE 21ST CENTURY].

    Pleniceanu, Oren / Dekel, Benjamin

    Harefuah

    2021  Volume 160, Issue 12, Page(s) 827–832

    Abstract: Introduction: Over the past few decades, there have been tremendous advancements in the field of nephrology due to developments in genetics and molecular biology, such as the ability to pinpoint the causative mutations in congenital syndromes involving ... ...

    Abstract Introduction: Over the past few decades, there have been tremendous advancements in the field of nephrology due to developments in genetics and molecular biology, such as the ability to pinpoint the causative mutations in congenital syndromes involving the kidneys, animal models of kidney disease and an array of tools for manipulating nucleic acids. However, despite these achievements, in most cases, these sophisticated technologies have yet to translate into improved outcomes. Thus, there are still several important challenges in the field of pediatric nephrology, the most important of which are reviewed herein. These include: 1. Better understanding of the association between a specific genotype and disease phenotype in congenital anomalies of the kidney and urinary tract, and development of effective treatments for these anomalies. 2. Deeper understanding of the pathophysiology of genetic kidney diseases. 3. Application of the available molecular tools for the purpose of genetic treatments of congenital kidney disease. 4. Uncovering the underlying mechanisms of renal fibrosis and establishment of effective means of halting/preventing it. Advancements in any of these areas have a great potential to influence the prognosis of children with kidney diseases, and considering the fast pace in which new knowledge is acquired and technologies are developed, it is expected that at least some of these challenges will be met in the foreseeable future.
    MeSH term(s) Animals ; Humans ; Kidney ; Kidney Diseases/diagnosis ; Kidney Diseases/genetics ; Kidney Diseases/therapy ; Nephrology ; Prognosis ; Urinary Tract
    Language Hebrew
    Publishing date 2021-12-27
    Publishing country Israel
    Document type Journal Article ; Review
    ZDB-ID 953872-0
    ISSN 0017-7768
    ISSN 0017-7768
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: HOXA11 is another monogenic cause of congenital anomalies of the kidney and urinary tract-Reply.

    Kagan, Maayan / Pleniceanu, Oren / Vivante, Asaf

    Pediatric nephrology (Berlin, Germany)

    2022  Volume 38, Issue 3, Page(s) 935

    MeSH term(s) Humans ; Homeodomain Proteins ; Kidney/abnormalities ; Transcription Factors ; Urinary Tract/abnormalities ; Urogenital Abnormalities/genetics
    Chemical Substances Homeodomain Proteins ; HOXA11 protein, human ; Transcription Factors
    Language English
    Publishing date 2022-11-19
    Publishing country Germany
    Document type Letter ; Comment
    ZDB-ID 631932-4
    ISSN 1432-198X ; 0931-041X
    ISSN (online) 1432-198X
    ISSN 0931-041X
    DOI 10.1007/s00467-022-05814-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Kidney-specific methylation patterns correlate with kidney function and are lost upon kidney disease progression.

    Sagy, Naor / Meyrom, Noa / Beckerman, Pazit / Pleniceanu, Oren / Bar, Daniel Z

    Clinical epigenetics

    2024  Volume 16, Issue 1, Page(s) 27

    Abstract: Background: Chronological and biological age correlate with DNA methylation levels at specific sites in the genome. Linear combinations of multiple methylation sites, termed epigenetic clocks, can inform us the chronological age and predict multiple ... ...

    Abstract Background: Chronological and biological age correlate with DNA methylation levels at specific sites in the genome. Linear combinations of multiple methylation sites, termed epigenetic clocks, can inform us the chronological age and predict multiple health-related outcomes. However, why some sites correlating with lifespan, healthspan, or specific medical conditions remain poorly understood. Kidney fibrosis is the common pathway for chronic kidney disease, which affects 10% of European and US populations.
    Results: Here we identify epigenetic clocks and methylation sites that correlate with kidney function. Moreover, we identify methylation sites that have a unique methylation signature in the kidney. Methylation levels in majority of these sites correlate with kidney state and function. When kidney function deteriorates, all of these sites regress toward the common methylation pattern observed in other tissues. Interestingly, while the majority of sites are less methylated in the kidney and become more methylated with loss of function, a fraction of the sites are highly methylated in the kidney and become less methylated when kidney function declines. These methylation sites are enriched for specific transcription-factor binding sites. In a large subset of sites, changes in methylation patterns are accompanied by changes in gene expression in kidneys of chronic kidney disease patients.
    Conclusions: These results support the information theory of aging, and the hypothesis that the unique tissue identity, as captured by methylation patterns, is lost as tissue function declines. However, this information loss is not random, but guided toward a baseline that is dependent on the genomic loci.
    Significance statement: DNA methylation at specific sites accurately reflects chronological and biological age. We identify sites that have a unique methylation pattern in the kidney. Methylation levels in the majority of these sites correlate with kidney state and function. Moreover, when kidney function deteriorates, all of these sites regress toward the common methylation pattern observed in other tissues. Thus, the unique methylation signature of the kidney is degraded, and epigenetic information is lost, when kidney disease progresses. These methylation sites are enriched for specific and methylation-sensitive transcription-factor binding sites, and associated genes show disease-dependent changes in expression. These results support the information theory of aging, and the hypothesis that the unique tissue identity, as captured by methylation patterns, is lost as tissue function declines.
    MeSH term(s) Humans ; DNA Methylation ; Epigenesis, Genetic ; Kidney/metabolism ; Aging/genetics ; Renal Insufficiency, Chronic/genetics ; Renal Insufficiency, Chronic/metabolism ; Disease Progression ; CpG Islands
    Language English
    Publishing date 2024-02-12
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553921-8
    ISSN 1868-7083 ; 1868-7075
    ISSN (online) 1868-7083
    ISSN 1868-7075
    DOI 10.1186/s13148-024-01642-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: The genetic basis of congenital anomalies of the kidney and urinary tract.

    Kagan, Maayan / Pleniceanu, Oren / Vivante, Asaf

    Pediatric nephrology (Berlin, Germany)

    2022  Volume 37, Issue 10, Page(s) 2231–2243

    Abstract: During the past decades, remarkable progress has been made in our understanding of the molecular basis of kidney diseases, as well as in the ability to pinpoint disease-causing genetic changes. Congenital anomalies of the kidney and urinary tract (CAKUT) ...

    Abstract During the past decades, remarkable progress has been made in our understanding of the molecular basis of kidney diseases, as well as in the ability to pinpoint disease-causing genetic changes. Congenital anomalies of the kidney and urinary tract (CAKUT) are remarkably diverse, and may be either isolated to the kidney or involve other systems, and are notorious in their variable genotype-phenotype correlations. Genetic conditions underlying CAKUT are individually rare, but collectively contribute to disease etiology in ~ 16% of children with CAKUT. In this review, we will discuss basic concepts of kidney development and genetics, common causes of monogenic CAKUT, and the approach to diagnosing and managing a patient with suspected monogenic CAKUT. Altogether, the concepts presented herein represent an introduction to the emergence of nephrogenetics, a fast-growing multi-disciplinary field that is focused on deciphering the causes and manifestations of genetic kidney diseases as well as providing the framework for managing patients with genetic forms of CAKUT.
    MeSH term(s) Humans ; Kidney/abnormalities ; Kidney Diseases/diagnosis ; Kidney Diseases/genetics ; Urinary Tract/abnormalities ; Urogenital Abnormalities/diagnosis ; Urogenital Abnormalities/genetics ; Vesico-Ureteral Reflux
    Language English
    Publishing date 2022-02-04
    Publishing country Germany
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't
    ZDB-ID 631932-4
    ISSN 1432-198X ; 0931-041X
    ISSN (online) 1432-198X
    ISSN 0931-041X
    DOI 10.1007/s00467-021-05420-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Mixing Cells for Vascularized Kidney Regeneration.

    Namestnikov, Michael / Pleniceanu, Oren / Dekel, Benjamin

    Cells

    2021  Volume 10, Issue 5

    Abstract: The worldwide rise in prevalence of chronic kidney disease (CKD) demands innovative bio-medical solutions for millions of kidney patients. Kidney regenerative medicine aims to replenish tissue which is lost due to a common pathological pathway of ... ...

    Abstract The worldwide rise in prevalence of chronic kidney disease (CKD) demands innovative bio-medical solutions for millions of kidney patients. Kidney regenerative medicine aims to replenish tissue which is lost due to a common pathological pathway of fibrosis/inflammation and rejuvenate remaining tissue to maintain sufficient kidney function. To this end, cellular therapy strategies devised so far utilize kidney tissue-forming cells (KTFCs) from various cell sources, fetal, adult, and pluripotent stem-cells (PSCs). However, to increase engraftment and potency of the transplanted cells in a harsh hypoxic diseased environment, it is of importance to co-transplant KTFCs with vessel forming cells (VFCs). VFCs, consisting of endothelial cells (ECs) and mesenchymal stem-cells (MSCs), synergize to generate stable blood vessels, facilitating the vascularization of self-organizing KTFCs into renovascular units. In this paper, we review the different sources of KTFCs and VFCs which can be mixed, and report recent advances made in the field of kidney regeneration with emphasis on generation of vascularized kidney tissue by cell transplantation.
    MeSH term(s) Animals ; Endothelial Cells/transplantation ; Human Embryonic Stem Cells/transplantation ; Humans ; Mesenchymal Stem Cell Transplantation ; Mice ; Mouse Embryonic Stem Cells/transplantation ; Regenerative Medicine/methods ; Renal Insufficiency, Chronic/therapy ; Specimen Handling/methods
    Language English
    Publishing date 2021-05-06
    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/cells10051119
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Mixing Cells for Vascularized Kidney Regeneration

    Michael Namestnikov / Oren Pleniceanu / Benjamin Dekel

    Cells, Vol 10, Iss 1119, p

    2021  Volume 1119

    Abstract: The worldwide rise in prevalence of chronic kidney disease (CKD) demands innovative bio-medical solutions for millions of kidney patients. Kidney regenerative medicine aims to replenish tissue which is lost due to a common pathological pathway of ... ...

    Abstract The worldwide rise in prevalence of chronic kidney disease (CKD) demands innovative bio-medical solutions for millions of kidney patients. Kidney regenerative medicine aims to replenish tissue which is lost due to a common pathological pathway of fibrosis/inflammation and rejuvenate remaining tissue to maintain sufficient kidney function. To this end, cellular therapy strategies devised so far utilize kidney tissue-forming cells (KTFCs) from various cell sources, fetal, adult, and pluripotent stem-cells (PSCs). However, to increase engraftment and potency of the transplanted cells in a harsh hypoxic diseased environment, it is of importance to co-transplant KTFCs with vessel forming cells (VFCs). VFCs, consisting of endothelial cells (ECs) and mesenchymal stem-cells (MSCs), synergize to generate stable blood vessels, facilitating the vascularization of self-organizing KTFCs into renovascular units. In this paper, we review the different sources of KTFCs and VFCs which can be mixed, and report recent advances made in the field of kidney regeneration with emphasis on generation of vascularized kidney tissue by cell transplantation.
    Keywords kidney regeneration ; vascularization ; cellular therapy ; stem-cells ; iPSCs organoids ; Biology (General) ; QH301-705.5
    Subject code 616
    Language English
    Publishing date 2021-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: OCT4 induces long-lived dedifferentiated kidney progenitors poised to redifferentiate in 3D kidney spheroids.

    Omer, Dorit / Zontag, Osnat Cohen / Gnatek, Yehudit / Harari-Steinberg, Orit / Pleniceanu, Oren / Namestnikov, Michael / Cohen, Ayelet-Hashahar / Nissim-Rafinia, Malka / Tam, Gal / Kalisky, Tomer / Meshorer, Eran / Dekel, Benjamin

    Molecular therapy. Methods & clinical development

    2023  Volume 29, Page(s) 329–346

    Abstract: Upscaling of kidney epithelial cells is crucial for renal regenerative medicine. Nonetheless, the adult kidney lacks a distinct stem cell hierarchy, limiting the ability to long-term propagate clonal populations of primary cells that retain renal ... ...

    Abstract Upscaling of kidney epithelial cells is crucial for renal regenerative medicine. Nonetheless, the adult kidney lacks a distinct stem cell hierarchy, limiting the ability to long-term propagate clonal populations of primary cells that retain renal identity. Toward this goal, we tested the paradigm of shifting the balance between differentiation and stemness in the kidney by introducing a single pluripotency factor, OCT4. Here we show that ectopic expression of OCT4 in human adult kidney epithelial cells (hKEpC) induces the cells to dedifferentiate, stably proliferate, and clonally emerge over many generations. Control hKEpC dedifferentiate, assume fibroblastic morphology, and completely lose clonogenic capacity. Analysis of gene expression and histone methylation patterns revealed that OCT4 represses the HNF1B gene module, which is critical for kidney epithelial differentiation, and concomitantly activates stemness-related pathways. OCT4-hKEpC can be long-term expanded in the dedifferentiated state that is primed for renal differentiation. Thus, when expanded OCT4-hKEpC are grown as kidney spheroids (OCT4-kSPH), they reactivate the HNF1B gene signature, redifferentiate, and efficiently generate renal structures
    Language English
    Publishing date 2023-04-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2872938-9
    ISSN 2329-0501 ; 2329-0501
    ISSN (online) 2329-0501
    ISSN 2329-0501
    DOI 10.1016/j.omtm.2023.04.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Is the prognosis of congenital single functioning kidney benign? A population-based study.

    Alfandary, Hadas / Haskin, Orly / Goldberg, Ori / Dagan, Amit / Borovitz, Yael / Levi, Shelly / Davidovits, Miriam / Erlich, Tomer / Landau, Daniel / Pleniceanu, Oren

    Pediatric nephrology (Berlin, Germany)

    2021  Volume 36, Issue 9, Page(s) 2837–2845

    Abstract: Background: We investigated the risk of kidney injury among adolescents with and without a congenital single functioning kidney (SFK).: Methods: This retrospective study is based on a medical evaluation database of 17-year-old Israeli conscripts, ... ...

    Abstract Background: We investigated the risk of kidney injury among adolescents with and without a congenital single functioning kidney (SFK).
    Methods: This retrospective study is based on a medical evaluation database of 17-year-old Israeli conscripts, born during 1989-1999. Those with congenital SFK diagnosis, verified by a pediatric nephrologist's review of the original military medical committee classifications, were compared to the rest of the cohort. Kidney injury (KI) was defined as proteinuria, high blood pressure (BP), or estimated glomerular filtration rate (eGFR) < 90 ml/min/1.73 m
    Results: Of 979,630 screened candidates, 353 were diagnosed with SFK. The yearly incidence of SFK gradually increased in the first years of the study, reaching a plateau in 1995 (5.5 ± 1.2/10,000 births/year). The male to female ratio was 2.7:1. Concomitant genital malformations were documented in 5.5% of those with SFK. KI was more prevalent in the SFK than the control group (42.2% vs. 23.5%, p < 0.001). All three components of KI were more common in the SFK than the control group: high BP (31.7% vs. 23.1%, p < 0.001), proteinuria (18.2% vs. 0.4%, p < 0.001), and eGFR <90 ml/min/1.73m
    Conclusions: This large population-based study documents a significant risk for KI among adolescents with SFK. Obesity represents a major modifiable risk factor for KI, implicating the need for closer follow-up in this group during childhood.
    MeSH term(s) Adolescent ; Female ; Glomerular Filtration Rate ; Humans ; Hypertension ; Kidney ; Male ; Prognosis ; Proteinuria/epidemiology ; Retrospective Studies ; Solitary Kidney/epidemiology
    Language English
    Publishing date 2021-02-22
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 631932-4
    ISSN 1432-198X ; 0931-041X
    ISSN (online) 1432-198X
    ISSN 0931-041X
    DOI 10.1007/s00467-021-04980-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: An Israeli tuberous sclerosis cohort: the efficacy of different anti-epileptic strategies.

    Shlomovitz, Omer / Ben-Zeev, Bruria / Pleniceanu, Oren / Greenberger, Shoshana / Lahav, Einat / Mini, Sharon / Tzadok, Michal

    Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery

    2021  Volume 37, Issue 12, Page(s) 3827–3833

    Abstract: Aim: We aimed to describe the experience of a large single-center cohort for the clinical, radiological, and genetic characteristics, as well as to determine the efficacy of different anti-epileptic strategies in children and adults with tuberous ... ...

    Abstract Aim: We aimed to describe the experience of a large single-center cohort for the clinical, radiological, and genetic characteristics, as well as to determine the efficacy of different anti-epileptic strategies in children and adults with tuberous sclerosis complex (TSC).
    Methods: We carried out a historical cohort study on 91 TSC patients treated in a single center between 2008 and 2018.
    Results: Our cohort comprised 46 males and 45 females, with a median age of 15.6 years at the last follow-up. Mean follow-up time was 2.5 ± 0.75-5.5 years (range 0-9.5 years). Of those tested, a disease-causing mutation was identified in 90% of patients, 53% in TSC2, and 37% in TSC1. Epilepsy prevalence was similar among TSC1 and TSC2 mutated patients. The most common radiological finding were cortical tubers in 95% of patients, while subependymal giant cell astrocytoma (SEGA) were detected in 36% of patients. Notably, infantile spasms (IS) were diagnosed in 29%, with SEGA representing the only finding significantly different in prevalence between those with and without IS (62% vs. 28%, respectively, p = 0.009). Lastly, we did not find any difference in efficacy between three anti-epileptic treatments: Vagus nerve stimulation (VNS), CBD-based products, and the ketogenic diet, all showing approximately 30%-40% response rates.
    Significance: Altogether, we provide a comprehensive description of our experience in treating TSC, which could serve to expand current knowledge of the disease and its treatments.
    MeSH term(s) Adolescent ; Anticonvulsants/therapeutic use ; Astrocytoma ; Cohort Studies ; Epilepsy/epidemiology ; Epilepsy/etiology ; Epilepsy/therapy ; Female ; Humans ; Male ; Tuberous Sclerosis/diagnostic imaging ; Tuberous Sclerosis/epidemiology ; Tuberous Sclerosis/therapy
    Chemical Substances Anticonvulsants
    Language English
    Publishing date 2021-09-07
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 605988-0
    ISSN 1433-0350 ; 0302-2803 ; 0256-7040
    ISSN (online) 1433-0350
    ISSN 0302-2803 ; 0256-7040
    DOI 10.1007/s00381-021-05348-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Author Correction: Human kidney clonal proliferation disclose lineage-restricted precursor characteristics.

    Cohen-Zontag, Osnat / Gershon, Rotem / Harari-Steinberg, Orit / Kanter, Itamar / Omer, Dorit / Pleniceanu, Oren / Tam, Gal / Oriel, Sarit / Ben-Hur, Herzl / Katz, Guy / Dotan, Zohar / Kalisky, Tomer / Dekel, Benjamin / Pode-Shakked, Naomi

    Scientific reports

    2021  Volume 11, Issue 1, Page(s) 6970

    Language English
    Publishing date 2021-03-22
    Publishing country England
    Document type Published Erratum
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-021-86157-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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