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二酸化炭素投与と脳内老廃物除去 (COPETBI)

2026年10月5日 更新者:Andrew Mayer

健康状態および外傷性脳損傷における二酸化炭素誘発性タンパク質流出の機序

The current study tests whether different exposures to carbon dioxide (CO2) can safely result in the increased movement of proteins from the brain into the blood. The investigators believe that this would be a proxy for the brain clearing waste products more effectively. The current study will use a counter-balanced design, in which individuals with and without a history of traumatic brain injury (TBI) will receive different levels of CO2 (targeted changes of approximately 5 or 10 mmHG in end-tidal CO2) approximately one week apart. The counter-balanced design means that each participant receives a single dose of CO2 at each visit, and different doses of CO2 at each visit. The order in which participants receive the dose is randomized, and the participant will not be informed of the dose.

調査の概要

状態

募集

条件

介入・治療

詳細な説明

Impaired clearance of metabolic waste and cellular debris is a hallmark of TBI and other neurodegenerative conditions. Clearance primarily occurs through glymphatic/lymphatic pathways, which is partially dependent on the influx of cerebrospinal fluid (CSF). CSF flow is greatest during sleep, when low-frequency oscillations in cerebral blood volume are most prominent. The investigators propose that changing levels of cerebral blood volume via the administration of CO2 will drive CSF flow and ultimately promote brain waste clearance. The proposed study is significant because it examines whether prescribed CO2 can enhance protein efflux (i.e., a surrogate for waste clearance), and the biological mechanisms that may mediate this mechanism in both health and disease. The first study aim is therefore to determine whether the administration of CO2, a potent vasodilator, can be prescribed to mimic global changes in cerebral blood volume in a dose-dependent fashion. Basal protein levels and efflux (i.e., change from baseline) are quantified using high-sensitivity proteomic platforms. The second aim is to examine how individual differences in cerebrovascular function and other disease factors such as atrophy affect CO2-induced protein efflux.

Using a counter-balanced (AB/BA) design, individuals (aged 18-82 years) with chronic TBI and individuals without a history of TBI (healthy subjects) will be dosed to achieve either 5 or 10 mmHG changes in end-tidal CO2. Importantly, the proposed cerebrovascular mechanisms and surrogate markers of waste clearance are readily quantified in humans using advanced MR-imaging and commercially available proteomic platforms, exponentially increasing their clinical translation.

研究の種類

介入

入学 (推定)

200

段階

  • 適用できない

連絡先と場所

このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。

研究連絡先

  • 名前:Andrew Mayer R The Mind Research Network, PhD
  • 電話番号:505-272-0769
  • メール:amayer@mrn.org

研究連絡先のバックアップ

  • 名前:Sadie LaBauve, PhD
  • 電話番号:505-272-8739
  • メール:slabauve@mrn.org

研究場所

    • New Mexico
      • Albuquerque、New Mexico、アメリカ、87106
        • 募集
        • The Mind Research Network
        • 主任研究者:
          • Andrew Mayer, Phd
        • コンタクト:

参加基準

研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。

適格基準

就学可能な年齢

18年~82年 (大人、高齢者)

健康ボランティアの受け入れ

はい

受講資格のある性別

全て

説明

Inclusion criteria for TBI cohort: 1) Able to give valid informed consent, 2) 18-82 years old, 3) history of TBI of any severity level (mild, moderate or severe) that was sustained in adulthood (age 18 and older), which will be confirmed using a semi-structured identification method (includes asking about loss of consciousness, posttraumatic amnesia, and feeling dazed/confused).

Inclusion criteria for Healthy Subjects cohort: 1) Able to give valid informed consent and 2) 18-82 years old years old.

Exclusion criteria for TBI cohort: 1) contraindications to MRI scanning including pregnancy or claustrophobia, 2) unable to give valid informed consent, incarcerated, 3) diagnosed with Alzheimer's, ADRD or mild cognitive impairment, 4) pre-existing history of autism spectrum disorders, intellectual disability, serious neurological (e.g., epilepsy, tumors, other conditions requiring neurosurgery) or psychiatric disorders (requiring hospitalization) prior to TBI onset, 5) current or previous diagnosis of a psychosis spectrum disorder or bipolar disorder, 6) respiratory diseases or pulmonary conditions that may increase the risk of study procedures (e.g., severe asthma, chronic obstructive pulmonary disease or other significant respiratory disorders), 7) a history of cardiac arrythmias 8) history of a current substance use disorder, 9) non-English fluency (based on screener), 10) Weigh under 110 pounds for blood draw.

Exclusion criteria for Healthy Subjects cohort: 1) contraindications to MRI scanning including pregnancy or claustrophobia, 2) unable to give valid informed consent, incarcerated, 3) diagnosed with Alzheimer's, ADRD or mild cognitive impairment, 4) history of developmental, neurological, or psychiatric disorders requiring hospitalization, 5) regular use of any substance in the past six months (i.e., no current use confirmed with urine screening), 6) previous head injury with greater than 30 minutes loss of consciousness, 7) respiratory diseases or pulmonary conditions that may increase the risk of study procedures (e.g., severe asthma, chronic obstructive pulmonary disease or other significant respiratory disorders), 8) a history of cardiac arrythmias, 9) non-English fluency (based on screener), 10) Weigh under 110 pounds for blood draw.

研究計画

このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。

研究はどのように設計されていますか?

デザインの詳細

  • 主な目的:基礎科学
  • 割り当て:ランダム化
  • 介入モデル:クロスオーバー割り当て
  • マスキング:独身

武器と介入

参加者グループ / アーム
介入・治療
実験的:Individuals with TBI

A counter-balanced, cross-over design (AB/BA), in which individuals with TBI (aged 18-82 years) may be dosed to achieve 5 or 10 mmHG changes in ETCO2 across multiple visits.

This study looks at different levels of carbon dioxide (CO2) exposure (changes of approximately 5 or 10 mmHg) on the brain and proteins in blood, in response to a hypercapnia task while participants undergo MRI. This sequence will dynamically mix gases to target an increase of 5 or 10 mmHg in ETCO2 (increase of ~5-7% CO2 and equal decrease in nitrogen) while keeping O2 constant.

実験的:Healthy Subjects

A counter-balanced, cross-over design (AB/BA), in which individuals without a history of TBI (healthy subjects, aged 18-82 years) may be dosed to achieve 5 or 10 mmHG changes in ETCO2 across multiple visits.

This study looks at different levels of carbon dioxide (CO2) exposure (changes of approximately 5 or 10 mmHg) on the brain and proteins in blood, in response to a hypercapnia task while participants undergo MRI. This sequence will dynamically mix gases to target an increase of 5 or 10 mmHg in ETCO2 (increase of ~5-7% CO2 and equal decrease in nitrogen) while keeping O2 constant.

この研究は何を測定していますか?

主要な結果の測定

結果測定
メジャーの説明
時間枠
Cerebrovascular Reactivity (CVR), vascular-elicited bulk cerebral spinal fluid (VE-bCSF)
時間枠:2.5 hours post-intervention. Data will be reported at the conclusion of the study for all participants.

Cerebrovascular reactivity (CVR) will be quantified using time-shifted end-tidal carbon dioxide (ETCO₂) regressors to model blood oxygen level-dependent (BOLD) changes using functional magnetic resonance imaging, capturing the temporally lagged positive relationship between ETCO₂ and the BOLD signal. Vascular enhanced changes in bulk CSF flow will be assessed by regressing band-pass filtered global grey matter signals and their derivatives on CSF bulk flow to capture the temporally lagged, negative relationship. Both of these measurements are in arbitrary units, and will be quantified by calculating percent signal change and statistical fit between regressors.

2.5 hours post-intervention. Data will be reported at the conclusion of the study for all participants.
Protein Efflux (Surrogate Measure of Brain Waste Clearance)
時間枠:Blood will be drawn at baseline, immediately prior to hypercapnia, 45 minutes post-hypercapnia, 90 minutes post-hypercapnia and 150 minutes post-hypercapnia. Data will be reported at the conclusion of the study for all participants.

Protein efflux from the brain to the blood will be measured using Quanterix platform, with primary proteins including neurofilament light chain, brain-derived tau and glial fibrillary acidic protein (units=picogram/milligram).

For neurofilament light chain (NfL), the limit of detection (LOD) is 0.104 pg/mL, the range is 0.025-0.276 pg/mL, and the lower limit of quantification (LLOQ) is 0.241 pg/mL. For glial fibrillary acidic protein (GFAP), the LOD is 0.221 pg/mL, the range is 0.042-0.481 pg/mL, and the LLOQ is 0.467 pg/mL. For brain-derived tau (BD Tau), the LOD is 0.024 pg/mL, the range is 0.007-0.059 pg/mL, and the LLOQ is 0.053 pg/mL. All values are obtained from the Quanterix website datasheets.

Blood will be drawn at baseline, immediately prior to hypercapnia, 45 minutes post-hypercapnia, 90 minutes post-hypercapnia and 150 minutes post-hypercapnia. Data will be reported at the conclusion of the study for all participants.

二次結果の測定

結果測定
メジャーの説明
時間枠
Symptoms
時間枠:After the first blood draw (i.e., blood collected at baseline), 10 and 20 minutes post-hypercapnia, as well as after blood collected 90-minutes post-hypercapnia. Data will be reported at the conclusion of the study for all participants.

Participants will be asked to rate 4 different symptoms (current headache, current dizziness, current nausea, and current fogginess) on a Likert scale (range 0-10 for each symptom) at multiple times during the study. Symptom ratings will be summed to create a single summary score that can range between 0 and 40.

After the first blood draw (i.e., blood collected at baseline), 10 and 20 minutes post-hypercapnia, as well as after blood collected 90-minutes post-hypercapnia. Data will be reported at the conclusion of the study for all participants.

協力者と研究者

ここでは、この調査に関係する人々や組織を見つけることができます。

スポンサー

捜査官

  • 主任研究者:Andrew R Mayer, Phd、Mind Research Network

研究記録日

これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。

主要日程の研究

研究開始 (推定)

2026年12月1日

一次修了 (推定)

2031年1月1日

研究の完了 (推定)

2032年2月1日

試験登録日

最初に提出

2026年1月9日

QC基準を満たした最初の提出物

2026年1月15日

最初の投稿 (実際)

2026年1月21日

学習記録の更新

投稿された最後の更新 (実際)

2026年10月6日

QC基準を満たした最後の更新が送信されました

2026年10月5日

最終確認日

2025年12月1日

詳しくは

本研究に関する用語

その他の研究ID番号

  • 25-415

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いいえ

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