Unblocking collaterals (Tong-Luo)

"Unblocking collaterals" refers to the Traditional Chinese Medicine (TCM) therapeutic principle of "Tong-Luo," which aims to restore flow in obstructed microvascular networks and promote the recruitment of collateral circulation. Rather than a specific molecular target or receptor, it is a physiological strategy focused on enhancing arteriogenesis—the expansion of pre-existing arterial connections—to bypass vascular blockages in ischemic tissues. Modern research identifies this "unblocking" effect as a result of modulating a complex network of proteins, including pro-angiogenic growth factors like VEGF, survival kinases such as AKT1, and inflammatory mediators like TNF-alpha and IL-6. This therapeutic approach is commonly employed in the treatment of ischemic stroke, coronary artery disease, and chronic inflammatory conditions like osteoarthritis to restore perfusion and reduce tissue ischemia. Pharmacological agents associated with this principle, such as tetramethylpyrazine or the Buyang Huanwu Decoction, exert their effects by simultaneously targeting multiple signaling pathways to improve microcirculation and protect against reperfusion injury.

Other names

Dredging collateralsTong-LuoActivating collateralsPromoting blood circulation and unblocking collateralsOpening collaterals

Acts as a multi-targeted therapeutic strategy that promotes collateral vessel recruitment and angiogenesis via the VEGF/VEGFR2 axis, inhibits pro-inflammatory signaling through NF-κB suppression, and reduces ischemic cell death via the PI3K/AKT/mTOR signaling pathway.