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Acupuncture and Inflammation: Neuro-Immune Mechanisms from Acupoints to Target Organs
針灸與炎症調節：從穴位到器官的神經－免疫機制解析
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Inflammation is a fundamental defense response that protects the body against injury, infection, and cellular stress. When this response becomes excessive or persistent, it contributes to chronic diseases such as rheumatoid arthritis (RA), inflammatory bowel disease (IBD), asthma, chronic obstructive pulmonary disease (COPD), neurodegenerative disorders, and metabolic conditions.
Conventional anti-inflammatory drugs are effective but often limited by systemic side effects (e.g., metabolic disturbances, cardiovascular risks, infection susceptibility). This has stimulated interest in therapies that modulate the body’s intrinsic regulatory systems – in particular, the interaction between the nervous system and the immune system.
Acupuncture, long used in traditional East Asian medicine, is increasingly studied using modern biomedical methods. Recent experimental work suggests that acupuncture can regulate inflammation via neuro-immune mechanisms, providing a bridge between traditional practice and contemporary science. The following summary is based on experimental research published between 2016 and 2021, focusing on how acupoint stimulation influences inflammation from the local site to target organs.
1. Immune System Regulation
Modern studies show that acupuncture can affect both innate and adaptive immunity. A recurring theme is the shift from a pro-inflammatory to a more regulatory immune profile.
- Macrophage polarization: Stimulation at points such as ST36 (Zusanli) can promote the transition from M1 (pro-inflammatory) to M2 (repair-oriented) macrophages, thereby reducing mediators like TNF-α and IL-1β while increasing IL-10 and TGF-β.
- TLR4/MyD88/NF-κB pathway: This classical pathway is a central driver of inflammation in many diseases. Electroacupuncture has been reported to down-regulate TLR4, MyD88, and NF-κB signaling, resulting in lower levels of pro-inflammatory cytokines.
- T-cell balance: Acupuncture may increase regulatory T cells (Tregs) and reduce excessive Th1/Th17 responses, helping restore immune homeostasis.
Overall, acupuncture appears to act as an immune modulator rather than a simple immunosuppressant.
2. Digestive System
Inflammatory bowel disease, post-operative ileus, and non-alcoholic fatty liver disease (NAFLD) are closely related to intestinal inflammation and oxidative stress. Experimental data suggest that acupuncture can:
- Reduce cytokines such as IL-6, IL-12, IL-17, and TNF-α, while enhancing IL-10 in colitis models when points like ST36, ST37, and ST39 are used.
- Improve intestinal barrier function by regulating tight junction proteins and local immune cells.
- In NAFLD models, up-regulate Sirt1 and inhibit NLRP3 inflammasome activity, leading to reduced hepatic inflammation and oxidative damage.
Frequency matters: in some gastrointestinal models, stimulation around 10–30 Hz appears more effective for motility and inflammatory control than very low (2 Hz) or very high (100 Hz) frequencies.
3. Respiratory System
Asthma, COPD, and acute lung injury involve complex inflammatory cascades. In animal studies, acupuncture has been shown to:
- Down-regulate TLR4/NF-κB and MAPK signaling in lung tissue.
- Activate Nrf2/HO-1 antioxidant pathways, lowering oxidative stress and tissue damage.
- Suppress NLRP3 inflammasome activation and reduce IL-1β, IL-6, and TNF-α.
- Adjust Th2/Th17–dominant responses toward a more balanced Th1/Treg profile in asthma models.
Commonly studied acupoints include BL13, ST36, and LI4, often used in combination rather than as single-point stimulation.
4. Nervous System
Neuroinflammation is now recognized as a key component of stroke, traumatic brain injury, epilepsy, and neurodegenerative disorders. Experimental work suggests acupuncture can:
- Reduce over-activation of microglia and astrocytes.
- Lower levels of inflammatory cytokines (e.g., TNF-α, IL-1β) and oxidative stress markers.
- Down-regulate NF-κB, MyD88, TLR4, and p38 MAPK pathways.
- Mitigate neuronal apoptosis and improve functional recovery, for example in ischemic stroke models using points such as GV20, LI4, and LR3.
5. From Acupoint to Organ: A Neuro-Immune Framework
A useful way to summarize current evidence is a four-step model:
- Peripheral activation at the acupoint: Needling or electrostimulation deforms connective tissue and activates local cells (fibroblasts, keratinocytes, macrophages, mast cells), triggering release of molecules that engage MAPK, ERK, and NF-κB cascades.
- Neural transmission and central integration: Signals travel via sensory nerves to the spinal cord, brainstem, and hypothalamus, modulating the vagus nerve anti-inflammatory pathway, sympathetic circuits, adrenal medulla responses, and the HPA axis.
- Immune modulation: Through these neuro-endocrine routes, acupuncture influences macrophages, neutrophils, mast cells, T-cell subsets, inflammasomes (e.g., NLRP3), and antioxidant systems (Nrf2/HO-1, Sirt1).
- Organ-level effects: The net result is reduced joint inflammation, improved gut barrier function, protection against lung injury, and neuroprotection in the central nervous system.
6. Clinical Implications
From a clinical perspective, these findings suggest that acupuncture:
- Acts as a systemic regulator of inflammation, rather than a local or single-target intervention.
- May produce different outcomes depending on acupoint selection, frequency, and stimulation parameters.
- Has the potential to complement conventional therapies, especially in chronic inflammatory and autoimmune conditions.
At the same time, most mechanistic data come from preclinical models. More well-designed clinical trials are needed to translate these insights into individualized treatment protocols for patients.
中文（繁體）— 點此展開／收合 Chinese Section
炎症是身體保護自身的一種重要機制，可以幫助清除病原、修復受損組織。然而，當炎症反應過度或長期存在時， 反而會促進疾病惡化，例如類風濕關節炎、發炎性腸病、氣喘、慢性阻塞性肺病、中樞神經退化及代謝性疾病等。
傳統抗炎藥物雖然有效，但長期使用往往伴隨高血壓、代謝異常、免疫力下降、感染風險增加等副作用。 因此，如何透過調節身體內在的 神經與免疫系統 來控制炎症，成為近年研究的重點。
針灸在傳統中醫中被廣泛用於各種疼痛與發炎相關疾病。近十多年，越來越多基礎研究顯示， 針灸可以透過 神經－免疫調節 的方式，影響全身炎症反應。 以下內容整理自 2016–2021 年的實驗研究，著重說明：針灸如何在不同器官系統中調節炎症， 以及「從穴位到器官」的大致生物學路徑。
一、免疫系統的調節
研究顯示，針灸會同時影響 先天免疫（如巨噬細胞、中性粒細胞）與 適應性免疫（如各類 T 細胞）。常見的機制包括：
- 巨噬細胞極化： 足三里等穴位的刺激，可促使巨噬細胞由偏向攻擊的 M1 型， 轉為較偏修復與調節的 M2 型，降低 TNF-α、IL-1β 等促炎因子，並提升 IL-10、TGF-β 等抗炎與修復相關因子。
- 抑制 TLR4/MyD88/NF-κB 通路： 此路徑是許多炎症疾病的關鍵訊號軸； 電針在多種模型中被發現可下調此通路，進而減少細胞激素的過度釋放。
- T 細胞平衡： 針灸可提升調節型 T 細胞（Treg），降低過度亢進的 Th1/Th17 反應， 有助於重新建立免疫平衡。
總體來看，針灸比較像是一種 免疫調節器，而非單純的免疫抑制。
二、消化系統
在發炎性腸病、術後腸蠕動減慢及非酒精性脂肪肝等疾病中，腸道炎症與氧化壓力是重要病理基礎。 實驗研究指出，針灸可以：
- 在結腸炎模型中，透過刺激足三里、上巨虛、下巨虛，降低 IL-6、IL-12、IL-17、TNF-α 等促炎因子， 並提升 IL-10 這類抗炎因子。
- 改善腸道黏膜屏障功能，調節腸道免疫細胞與局部微環境。
- 在脂肪肝模型中，上調 Sirt1，抑制 NLRP3 發炎體活性，減少肝臟炎症與氧化傷害。
在某些腸胃模型中，中等頻率（約 10–30 Hz）的電針，對腸蠕動與抗炎效果往往優於極低或極高頻率。
三、呼吸系統
氣喘、COPD、急性肺損傷等疾病，多與複雜的炎症反應有關。動物研究顯示，針灸可以：
- 抑制肺部 TLR4/NF-κB、MAPK 等促炎訊號傳導。
- 啟動 Nrf2/HO-1 抗氧化系統，減少氧化壓力與組織損傷。
- 降低 NLRP3 發炎體活性及 IL-1β、IL-6、TNF-α 等發炎介質。
- 在氣喘模型中，調整 Th2/Th17 過度優勢的狀態，往較平衡的 Th1/Treg 方向發展。
常被研究的穴位包括肺俞（BL13）、足三里（ST36）、合谷（LI4），而且多採用多穴組合。
四、神經系統
中樞神經的慢性炎症（neuroinflammation）與中風、腦外傷、癲癇及神經退化性疾病密切相關。 研究顯示，針灸在這些模型中具有下列作用：
- 減少小膠質細胞與星狀膠質細胞的過度活化。
- 降低 TNF-α、IL-1β 等發炎因子以及氧化壓力指標。
- 下調 NF-κB、MyD88、TLR4、p38 MAPK 等訊號通路。
- 減少神經細胞凋亡，改善中風後的神經功能缺損；例如以百會（GV20）、合谷（LI4）、太衝（LR3）電針的研究成果。
五、從穴位到器官：神經－免疫的整體路徑
目前文獻大致可以整理成四個階段：
- 穴位局部啟動： 針刺或電針造成結締組織變形，活化成纖維細胞、角質細胞、 巨噬細胞、肥大細胞等，釋放多種訊號分子，啟動 MAPK、ERK、NF-κB 等通路。
- 中樞神經整合： 感覺訊號經周邊神經傳入脊髓、腦幹與下丘腦，進一步調節 迷走神經抗炎路徑、交感神經活動、腎上腺髓質反應以及 HPA 軸。
- 免疫細胞調節： 透過神經與內分泌的交互作用，影響巨噬細胞、中性粒細胞、 肥大細胞、各類 T 細胞、發炎體（如 NLRP3）及抗氧化系統（如 Nrf2/HO-1、Sirt1）。
- 器官層面的效果： 最終在不同器官表現為關節腫脹減輕、腸道屏障修復、 肺損傷緩解以及中樞神經保護等。
六、臨床啟發
從臨床角度來看，這些研究提示：
- 針灸較像是系統性的「炎症調節器」，而非只作用在單一器官或單一分子。
- 穴位組合、刺激頻率與施術方式不同，可能導致不同的免疫調節效果。
- 在許多慢性發炎與自體免疫疾病中，針灸有機會作為西醫治療的輔助選項，協同改善病程。
目前大部分機制仍來自主要為動物與細胞實驗，人類臨床試驗仍需持續累積。 對臨床工作者而言，如何將這些機制資訊轉化為個體化的針灸處方設計，仍是一個值得發展的方向。
References｜參考文獻
Li, N., Wang, Y., & Zhao, W.-Q. (2021). The anti-inflammatory actions and mechanisms of acupuncture from acupoint to target organs via neuro-immune regulation. Journal of Inflammation Research, 14, 7191–7224. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC8710088/
This blog is a scholarly summary and reinterpretation based on the above article, not a verbatim reproduction. 本文為依據原始文獻內容所做之學術性整理與轉述，非原文逐字翻譯。
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