Nerve growth factor metabolic dysfunction in Down’s syndrome brains

Basal forebrain cholinergic neurons play a key role in cognition. This neuronal system is highly dependent on NGF for its synaptic integrity and the phenotypic maintenance of its cell bodies. Basal forebrain cholinergic neurons progressively degenerate in Alzheimer's disease and Down's syn...

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Published inBrain (London, England : 1878) Vol. 137; no. 3; pp. 860 - 872
Main Authors Iulita, M. Florencia, Do Carmo, Sonia, Ower, Alison K., Fortress, Ashley M., Aguilar, Lisi Flores, Hanna, Michael, Wisniewski, Thomas, Granholm, Ann-Charlotte, Buhusi, Mona, Busciglio, Jorge, Cuello, A. Claudio
Format Journal Article
LanguageEnglish
Published Oxford Oxford University Press 01.03.2014
Subjects
Online AccessGet full text
ISSN0006-8950
1460-2156
1460-2156
DOI10.1093/brain/awt372

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Abstract Basal forebrain cholinergic neurons play a key role in cognition. This neuronal system is highly dependent on NGF for its synaptic integrity and the phenotypic maintenance of its cell bodies. Basal forebrain cholinergic neurons progressively degenerate in Alzheimer's disease and Down's syndrome, and their atrophy contributes to the manifestation of dementia. Paradoxically, in Alzheimer's disease brains, the synthesis of NGF is not affected and there is abundance of the NGF precursor, proNGF. We have shown that this phenomenon is the result of a deficit in NGF's extracellular metabolism that compromises proNGF maturation and exacerbates its subsequent degradation. We hypothesized that a similar imbalance should be present in Down's syndrome. Using a combination of quantitative reverse transcription-polymerase chain reaction, enzyme-linked immunosorbent assay, western blotting and zymography, we investigated signs of NGF metabolic dysfunction in post-mortem brains from the temporal (n = 14), frontal (n = 34) and parietal (n = 20) cortex obtained from subjects with Down's syndrome and age-matched controls (age range 31-68 years). We further examined primary cultures of human foetal Down's syndrome cortex (17-21 gestational age weeks) and brains from Ts65Dn mice (12-22 months), a widely used animal model of Down's syndrome. We report a significant increase in proNGF levels in human and mouse Down's syndrome brains, with a concomitant reduction in the levels of plasminogen and tissue plasminogen activator messenger RNA as well as an increment in neuroserpin expression; enzymes that partake in proNGF maturation. Human Down's syndrome brains also exhibited elevated zymogenic activity of MMP9, the major NGF-degrading protease. Our results indicate a failure in NGF precursor maturation in Down's syndrome brains and a likely enhanced proteolytic degradation of NGF, changes which can compromise the trophic support of basal forebrain cholinergic neurons. The alterations in proNGF and MMP9 were also present in cultures of Down's syndrome foetal cortex; suggesting that this trophic compromise may be amenable to rescue, before frank dementia onset. Our study thus provides a novel paradigm for cholinergic neuroprotection in Alzheimer's disease and Down's syndrome.
AbstractList Individuals with Down’s syndrome are at increased risk of Alzheimer’s disease. Using post-mortem human brain tissue, foetal cortex cultures and Ts65Dn trisomic mice, Iulita et al. reveal marked alterations in nerve growth factor metabolism in Down’s syndrome, consistent with similar defects previously reported by this group in Alzheimer’s disease. Basal forebrain cholinergic neurons play a key role in cognition. This neuronal system is highly dependent on NGF for its synaptic integrity and the phenotypic maintenance of its cell bodies. Basal forebrain cholinergic neurons progressively degenerate in Alzheimer’s disease and Down’s syndrome, and their atrophy contributes to the manifestation of dementia. Paradoxically, in Alzheimer’s disease brains, the synthesis of NGF is not affected and there is abundance of the NGF precursor, proNGF. We have shown that this phenomenon is the result of a deficit in NGF’s extracellular metabolism that compromises proNGF maturation and exacerbates its subsequent degradation. We hypothesized that a similar imbalance should be present in Down’s syndrome. Using a combination of quantitative reverse transcription-polymerase chain reaction, enzyme-linked immunosorbent assay, western blotting and zymography, we investigated signs of NGF metabolic dysfunction in post-mortem brains from the temporal ( n = 14), frontal ( n = 34) and parietal ( n = 20) cortex obtained from subjects with Down’s syndrome and age-matched controls (age range 31–68 years). We further examined primary cultures of human foetal Down’s syndrome cortex (17–21 gestational age weeks) and brains from Ts65Dn mice (12–22 months), a widely used animal model of Down’s syndrome. We report a significant increase in proNGF levels in human and mouse Down’s syndrome brains, with a concomitant reduction in the levels of plasminogen and tissue plasminogen activator messenger RNA as well as an increment in neuroserpin expression; enzymes that partake in proNGF maturation. Human Down’s syndrome brains also exhibited elevated zymogenic activity of MMP9, the major NGF-degrading protease. Our results indicate a failure in NGF precursor maturation in Down’s syndrome brains and a likely enhanced proteolytic degradation of NGF, changes which can compromise the trophic support of basal forebrain cholinergic neurons. The alterations in proNGF and MMP9 were also present in cultures of Down’s syndrome foetal cortex; suggesting that this trophic compromise may be amenable to rescue, before frank dementia onset. Our study thus provides a novel paradigm for cholinergic neuroprotection in Alzheimer’s disease and Down’s syndrome.
Basal forebrain cholinergic neurons play a key role in cognition. This neuronal system is highly dependent on NGF for its synaptic integrity and the phenotypic maintenance of its cell bodies. Basal forebrain cholinergic neurons progressively degenerate in Alzheimer's disease and Down's syndrome, and their atrophy contributes to the manifestation of dementia. Paradoxically, in Alzheimer's disease brains, the synthesis of NGF is not affected and there is abundance of the NGF precursor, proNGF. We have shown that this phenomenon is the result of a deficit in NGF's extracellular metabolism that compromises proNGF maturation and exacerbates its subsequent degradation. We hypothesized that a similar imbalance should be present in Down's syndrome. Using a combination of quantitative reverse transcription-polymerase chain reaction, enzyme-linked immunosorbent assay, western blotting and zymography, we investigated signs of NGF metabolic dysfunction in post-mortem brains from the temporal (n = 14), frontal (n = 34) and parietal (n = 20) cortex obtained from subjects with Down's syndrome and age-matched controls (age range 31-68 years). We further examined primary cultures of human foetal Down's syndrome cortex (17-21 gestational age weeks) and brains from Ts65Dn mice (12-22 months), a widely used animal model of Down's syndrome. We report a significant increase in proNGF levels in human and mouse Down's syndrome brains, with a concomitant reduction in the levels of plasminogen and tissue plasminogen activator messenger RNA as well as an increment in neuroserpin expression; enzymes that partake in proNGF maturation. Human Down's syndrome brains also exhibited elevated zymogenic activity of MMP9, the major NGF-degrading protease. Our results indicate a failure in NGF precursor maturation in Down's syndrome brains and a likely enhanced proteolytic degradation of NGF, changes which can compromise the trophic support of basal forebrain cholinergic neurons. The alterations in proNGF and MMP9 were also present in cultures of Down's syndrome foetal cortex; suggesting that this trophic compromise may be amenable to rescue, before frank dementia onset. Our study thus provides a novel paradigm for cholinergic neuroprotection in Alzheimer's disease and Down's syndrome.
Individuals with Down's syndrome are at increased risk of Alzheimer's disease. Using post-mortem human brain tissue, foetal cortex cultures and Ts65Dn trisomic mice, Iulita et al. reveal marked alterations in nerve growth factor metabolism in Down's syndrome, consistent with similar defects previously reported by this group in Alzheimer's disease. Individuals with Down's syndrome are at increased risk of Alzheimer's disease. Using post-mortem human brain tissue, foetal cortex cultures and Ts65Dn trisomic mice, Iulita et al. reveal marked alterations in nerve growth factor metabolism in Down's syndrome, consistent with similar defects previously reported by this group in Alzheimer's disease.
Basal forebrain cholinergic neurons play a key role in cognition. This neuronal system is highly dependent on NGF for its synaptic integrity and the phenotypic maintenance of its cell bodies. Basal forebrain cholinergic neurons progressively degenerate in Alzheimer's disease and Down's syndrome, and their atrophy contributes to the manifestation of dementia. Paradoxically, in Alzheimer's disease brains, the synthesis of NGF is not affected and there is abundance of the NGF precursor, proNGF. We have shown that this phenomenon is the result of a deficit in NGF's extracellular metabolism that compromises proNGF maturation and exacerbates its subsequent degradation. We hypothesized that a similar imbalance should be present in Down's syndrome. Using a combination of quantitative reverse transcription-polymerase chain reaction, enzyme-linked immunosorbent assay, western blotting and zymography, we investigated signs of NGF metabolic dysfunction in post-mortem brains from the temporal (n = 14), frontal (n = 34) and parietal (n = 20) cortex obtained from subjects with Down's syndrome and age-matched controls (age range 31-68 years). We further examined primary cultures of human foetal Down's syndrome cortex (17-21 gestational age weeks) and brains from Ts65Dn mice (12-22 months), a widely used animal model of Down's syndrome. We report a significant increase in proNGF levels in human and mouse Down's syndrome brains, with a concomitant reduction in the levels of plasminogen and tissue plasminogen activator messenger RNA as well as an increment in neuroserpin expression; enzymes that partake in proNGF maturation. Human Down's syndrome brains also exhibited elevated zymogenic activity of MMP9, the major NGF-degrading protease. Our results indicate a failure in NGF precursor maturation in Down's syndrome brains and a likely enhanced proteolytic degradation of NGF, changes which can compromise the trophic support of basal forebrain cholinergic neurons. The alterations in proNGF and MMP9 were also present in cultures of Down's syndrome foetal cortex; suggesting that this trophic compromise may be amenable to rescue, before frank dementia onset. Our study thus provides a novel paradigm for cholinergic neuroprotection in Alzheimer's disease and Down's syndrome.Basal forebrain cholinergic neurons play a key role in cognition. This neuronal system is highly dependent on NGF for its synaptic integrity and the phenotypic maintenance of its cell bodies. Basal forebrain cholinergic neurons progressively degenerate in Alzheimer's disease and Down's syndrome, and their atrophy contributes to the manifestation of dementia. Paradoxically, in Alzheimer's disease brains, the synthesis of NGF is not affected and there is abundance of the NGF precursor, proNGF. We have shown that this phenomenon is the result of a deficit in NGF's extracellular metabolism that compromises proNGF maturation and exacerbates its subsequent degradation. We hypothesized that a similar imbalance should be present in Down's syndrome. Using a combination of quantitative reverse transcription-polymerase chain reaction, enzyme-linked immunosorbent assay, western blotting and zymography, we investigated signs of NGF metabolic dysfunction in post-mortem brains from the temporal (n = 14), frontal (n = 34) and parietal (n = 20) cortex obtained from subjects with Down's syndrome and age-matched controls (age range 31-68 years). We further examined primary cultures of human foetal Down's syndrome cortex (17-21 gestational age weeks) and brains from Ts65Dn mice (12-22 months), a widely used animal model of Down's syndrome. We report a significant increase in proNGF levels in human and mouse Down's syndrome brains, with a concomitant reduction in the levels of plasminogen and tissue plasminogen activator messenger RNA as well as an increment in neuroserpin expression; enzymes that partake in proNGF maturation. Human Down's syndrome brains also exhibited elevated zymogenic activity of MMP9, the major NGF-degrading protease. Our results indicate a failure in NGF precursor maturation in Down's syndrome brains and a likely enhanced proteolytic degradation of NGF, changes which can compromise the trophic support of basal forebrain cholinergic neurons. The alterations in proNGF and MMP9 were also present in cultures of Down's syndrome foetal cortex; suggesting that this trophic compromise may be amenable to rescue, before frank dementia onset. Our study thus provides a novel paradigm for cholinergic neuroprotection in Alzheimer's disease and Down's syndrome.
Author Wisniewski, Thomas
Busciglio, Jorge
Do Carmo, Sonia
Iulita, M. Florencia
Ower, Alison K.
Cuello, A. Claudio
Hanna, Michael
Fortress, Ashley M.
Aguilar, Lisi Flores
Granholm, Ann-Charlotte
Buhusi, Mona
AuthorAffiliation 2 Department of Neurosciences and the Centre on Ageing, Medical University of South Carolina, BSB Room 403, 173 Ashley Avenue, Charleston, 29425, USA
3 Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montreal, H3G1Y6, Canada
1 Department of Pharmacology and Therapeutics, McGill University, 3655 Sir-William-Osler Promenade, Montreal, H3G1Y6, Canada
4 Department of Neurobiology and Behaviour, University of California, 2205 McGaugh Hall, Irvine, 92697, USA
5 Departments of Neurology, Pathology and Psychiatry, New York University School of Medicine, 240 East 38th Street, New York, 10016, USA
6 Department of Neurology and Neurosurgery, McGill University, 3801 University Street, Montreal, H3G1Y6, Canada
AuthorAffiliation_xml – name: 1 Department of Pharmacology and Therapeutics, McGill University, 3655 Sir-William-Osler Promenade, Montreal, H3G1Y6, Canada
– name: 4 Department of Neurobiology and Behaviour, University of California, 2205 McGaugh Hall, Irvine, 92697, USA
– name: 5 Departments of Neurology, Pathology and Psychiatry, New York University School of Medicine, 240 East 38th Street, New York, 10016, USA
– name: 3 Department of Anatomy and Cell Biology, McGill University, 3640 University Street, Montreal, H3G1Y6, Canada
– name: 2 Department of Neurosciences and the Centre on Ageing, Medical University of South Carolina, BSB Room 403, 173 Ashley Avenue, Charleston, 29425, USA
– name: 6 Department of Neurology and Neurosurgery, McGill University, 3801 University Street, Montreal, H3G1Y6, Canada
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  givenname: M. Florencia
  surname: Iulita
  fullname: Iulita, M. Florencia
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  givenname: Sonia
  surname: Do Carmo
  fullname: Do Carmo, Sonia
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  givenname: Alison K.
  surname: Ower
  fullname: Ower, Alison K.
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  givenname: Ashley M.
  surname: Fortress
  fullname: Fortress, Ashley M.
– sequence: 5
  givenname: Lisi Flores
  surname: Aguilar
  fullname: Aguilar, Lisi Flores
– sequence: 6
  givenname: Michael
  surname: Hanna
  fullname: Hanna, Michael
– sequence: 7
  givenname: Thomas
  surname: Wisniewski
  fullname: Wisniewski, Thomas
– sequence: 8
  givenname: Ann-Charlotte
  surname: Granholm
  fullname: Granholm, Ann-Charlotte
– sequence: 9
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  fullname: Busciglio, Jorge
– sequence: 11
  givenname: A. Claudio
  surname: Cuello
  fullname: Cuello, A. Claudio
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ID FETCH-LOGICAL-c447t-c86ad603dc64f9a510d42620c542d11e366353c3178f6c0a6a0b4f8ea2839ecc3
ISSN 0006-8950
1460-2156
IngestDate Thu Aug 21 14:21:12 EDT 2025
Sun Sep 28 06:39:20 EDT 2025
Sun Sep 28 13:03:33 EDT 2025
Mon Jul 21 05:34:26 EDT 2025
Wed Apr 02 07:21:45 EDT 2025
Tue Jul 01 00:46:06 EDT 2025
Thu Apr 24 23:10:35 EDT 2025
IsDoiOpenAccess false
IsOpenAccess true
IsPeerReviewed true
IsScholarly true
Issue 3
Keywords Chromosomal aberration
Endocrinopathy
Cholinergic neuron
Trisomy
Alzheimer disease
Central nervous system
Aneuploidy
Cardiovascular disease
Nerve growth factor
Metabolic syndrome
Encephalon
Down's syndrome
basal forebrain cholinergic neurons
Degenerative disease
Alzheimer's disease
Nervous system diseases
Enzyme
Chromosome G21
Metabolic diseases
matrix metallo-protease 9
Down syndrome
Cerebral disorder
Peptidases
Metabolic disorder
Central nervous system disease
proNGF
Hydrolases
Down’s syndrome
Alzheimer’s disease
Language English
License CC BY 4.0
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Snippet Basal forebrain cholinergic neurons play a key role in cognition. This neuronal system is highly dependent on NGF for its synaptic integrity and the phenotypic...
Individuals with Down's syndrome are at increased risk of Alzheimer's disease. Using post-mortem human brain tissue, foetal cortex cultures and Ts65Dn trisomic...
Individuals with Down’s syndrome are at increased risk of Alzheimer’s disease. Using post-mortem human brain tissue, foetal cortex cultures and Ts65Dn trisomic...
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StartPage 860
SubjectTerms Adult
Adult and adolescent clinical studies
Aged
Alzheimer's disease
Animals
Biological and medical sciences
Case-Control Studies
Chromosome aberrations
Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases
Disease Models, Animal
Down Syndrome - enzymology
Down Syndrome - metabolism
Down Syndrome - physiopathology
Fetus - enzymology
Fetus - metabolism
Fetus - pathology
Gestational Age
Humans
Matrix Metalloproteinase 9 - physiology
Medical genetics
Medical sciences
Metabolic diseases
Mice
Mice, Transgenic
Middle Aged
Miscellaneous
Nerve Growth Factor - biosynthesis
Nerve Growth Factor - metabolism
Nerve Growth Factor - physiology
Neurology
Organic mental disorders. Neuropsychology
Original
Other metabolic disorders
Prosencephalon - enzymology
Prosencephalon - metabolism
Prosencephalon - pathology
Protein Precursors - physiology
Psychology. Psychoanalysis. Psychiatry
Psychopathology. Psychiatry
Title Nerve growth factor metabolic dysfunction in Down’s syndrome brains
URI https://www.ncbi.nlm.nih.gov/pubmed/24519975
https://www.proquest.com/docview/1500689331
https://www.proquest.com/docview/1505345210
https://pubmed.ncbi.nlm.nih.gov/PMC3927704
Volume 137
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