King's College London

Research portal

Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus

Research output: Contribution to journalArticle

Standard

Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus. / Blest-Hopley, Grace; O'Neill, Aisling; Wilson, Robin; Giampietro, Vincent; Lythgoe, David; Egerton, Alice; Bhattacharyya, Sagnik.

In: Addiction Biology, 02.09.2019.

Research output: Contribution to journalArticle

Harvard

Blest-Hopley, G, O'Neill, A, Wilson, R, Giampietro, V, Lythgoe, D, Egerton, A & Bhattacharyya, S 2019, 'Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus', Addiction Biology. https://doi.org/10.1111/adb.12827

APA

Blest-Hopley, G., O'Neill, A., Wilson, R., Giampietro, V., Lythgoe, D., Egerton, A., & Bhattacharyya, S. (2019). Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus. Addiction Biology, [e12827]. https://doi.org/10.1111/adb.12827

Vancouver

Blest-Hopley G, O'Neill A, Wilson R, Giampietro V, Lythgoe D, Egerton A et al. Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus. Addiction Biology. 2019 Sep 2. e12827. https://doi.org/10.1111/adb.12827

Author

Blest-Hopley, Grace ; O'Neill, Aisling ; Wilson, Robin ; Giampietro, Vincent ; Lythgoe, David ; Egerton, Alice ; Bhattacharyya, Sagnik. / Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus. In: Addiction Biology. 2019.

Bibtex Download

@article{f990d9cd06c542019ac0ac30a9160da9,
title = "Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus",
abstract = "Cannabis use has been associated with adverse mental health outcomes, the neurochemical underpinnings of which are poorly understood. Although preclinical evidence suggests glutamatergic dysfunction following cannabis exposure in several brain regions including the hippocampus, evidence from human studies have been inconsistent. We investigated the effect of persistent cannabis use on the brain levels of N‐acetyl aspartate (NAA) and myoinositol, the metabolite markers of neurons and glia, the site of the main central cannabinoid CB1 receptor, and the levels of glutamate, the neurotransmitter directly affected by CB1 modulation. We investigated cannabis users (CUs) who started using during adolescence, the period of greatest vulnerability to cannabis effects and focused on the hippocampus, where type 1 cannabinoid receptors (CBR1) are expressed in high density and have been linked to altered glutamatergic neurotransmission. Twenty‐two adolescent‐onset CUs and 21 nonusing controls (NU), completed proton magnetic resonance spectroscopy, to measure hippocampal metabolite concentrations. Glutamate, NAA, and myoinositol levels were compared between CU and NU using separate analyses of covariance. CU had significantly lower myoinositol but not glutamate or NAA levels in the hippocampus compared with NU. Myoinositol levels in CU positively correlated with glutamate levels, whereas this association was absent in NU. Altered myoinositol levels may be a marker of glia dysfunction and is consistent with experimental preclinical evidence that cannabinoid‐induced glial dysfunction may underlie cannabinoid‐induced memory impairments. Future studies using appropriate imaging techniques such as positron emission tomography should investigate whether glial dysfunction associated with cannabis use underlies hippocampal dysfunction and memory impairment in CUs.",
keywords = "Cannabis, Glia, H MRS, myoinositol, spectroscopy, tetrahydrocannabinol",
author = "Grace Blest-Hopley and Aisling O'Neill and Robin Wilson and Vincent Giampietro and David Lythgoe and Alice Egerton and Sagnik Bhattacharyya",
year = "2019",
month = "9",
day = "2",
doi = "10.1111/adb.12827",
language = "English",
journal = "Addiction Biology",
issn = "1355-6215",
publisher = "Wiley-Blackwell",

}

RIS (suitable for import to EndNote) Download

TY - JOUR

T1 - Adolescent‐onset heavy cannabis use associated with significantly reduced glial but not neuronal markers and glutamate levels in the hippocampus

AU - Blest-Hopley, Grace

AU - O'Neill, Aisling

AU - Wilson, Robin

AU - Giampietro, Vincent

AU - Lythgoe, David

AU - Egerton, Alice

AU - Bhattacharyya, Sagnik

PY - 2019/9/2

Y1 - 2019/9/2

N2 - Cannabis use has been associated with adverse mental health outcomes, the neurochemical underpinnings of which are poorly understood. Although preclinical evidence suggests glutamatergic dysfunction following cannabis exposure in several brain regions including the hippocampus, evidence from human studies have been inconsistent. We investigated the effect of persistent cannabis use on the brain levels of N‐acetyl aspartate (NAA) and myoinositol, the metabolite markers of neurons and glia, the site of the main central cannabinoid CB1 receptor, and the levels of glutamate, the neurotransmitter directly affected by CB1 modulation. We investigated cannabis users (CUs) who started using during adolescence, the period of greatest vulnerability to cannabis effects and focused on the hippocampus, where type 1 cannabinoid receptors (CBR1) are expressed in high density and have been linked to altered glutamatergic neurotransmission. Twenty‐two adolescent‐onset CUs and 21 nonusing controls (NU), completed proton magnetic resonance spectroscopy, to measure hippocampal metabolite concentrations. Glutamate, NAA, and myoinositol levels were compared between CU and NU using separate analyses of covariance. CU had significantly lower myoinositol but not glutamate or NAA levels in the hippocampus compared with NU. Myoinositol levels in CU positively correlated with glutamate levels, whereas this association was absent in NU. Altered myoinositol levels may be a marker of glia dysfunction and is consistent with experimental preclinical evidence that cannabinoid‐induced glial dysfunction may underlie cannabinoid‐induced memory impairments. Future studies using appropriate imaging techniques such as positron emission tomography should investigate whether glial dysfunction associated with cannabis use underlies hippocampal dysfunction and memory impairment in CUs.

AB - Cannabis use has been associated with adverse mental health outcomes, the neurochemical underpinnings of which are poorly understood. Although preclinical evidence suggests glutamatergic dysfunction following cannabis exposure in several brain regions including the hippocampus, evidence from human studies have been inconsistent. We investigated the effect of persistent cannabis use on the brain levels of N‐acetyl aspartate (NAA) and myoinositol, the metabolite markers of neurons and glia, the site of the main central cannabinoid CB1 receptor, and the levels of glutamate, the neurotransmitter directly affected by CB1 modulation. We investigated cannabis users (CUs) who started using during adolescence, the period of greatest vulnerability to cannabis effects and focused on the hippocampus, where type 1 cannabinoid receptors (CBR1) are expressed in high density and have been linked to altered glutamatergic neurotransmission. Twenty‐two adolescent‐onset CUs and 21 nonusing controls (NU), completed proton magnetic resonance spectroscopy, to measure hippocampal metabolite concentrations. Glutamate, NAA, and myoinositol levels were compared between CU and NU using separate analyses of covariance. CU had significantly lower myoinositol but not glutamate or NAA levels in the hippocampus compared with NU. Myoinositol levels in CU positively correlated with glutamate levels, whereas this association was absent in NU. Altered myoinositol levels may be a marker of glia dysfunction and is consistent with experimental preclinical evidence that cannabinoid‐induced glial dysfunction may underlie cannabinoid‐induced memory impairments. Future studies using appropriate imaging techniques such as positron emission tomography should investigate whether glial dysfunction associated with cannabis use underlies hippocampal dysfunction and memory impairment in CUs.

KW - Cannabis

KW - Glia

KW - H MRS

KW - myoinositol

KW - spectroscopy

KW - tetrahydrocannabinol

UR - http://www.scopus.com/inward/record.url?scp=85071631122&partnerID=8YFLogxK

U2 - 10.1111/adb.12827

DO - 10.1111/adb.12827

M3 - Article

JO - Addiction Biology

JF - Addiction Biology

SN - 1355-6215

M1 - e12827

ER -

View graph of relations

© 2018 King's College London | Strand | London WC2R 2LS | England | United Kingdom | Tel +44 (0)20 7836 5454