Bie Jia

Small collagen-derived peptides are considered the main active substances for liver disease. In experimental models they inhibit hepatic stellate cell activation and proliferation, downregulate TGF-beta1/Smad signaling and extracellular matrix deposition, and protect hepatocytes from injury, providing a mechanistic basis for the traditional use in softening abdominal masses and hepatosplenomegaly.

The bulk protein matrix from which bioactive peptides and gelatin are released on decoction; the source of the yin-nourishing, tissue-building traditional actions.

Provide nutritive, yin-nourishing value and serve as substrates for tissue repair; the amino-acid profile is dominated by the collagen-type residues glycine and proline.

The principal mineral components giving the shell its density; contribute calcium and a settling, anchoring quality traditionally associated with subduing ascendant yang.

Nutritive trace elements that support enzymatic and hematopoietic functions, consistent with the tonifying use in yin and blood deficiency.

Released when the crushed shell is boiled, giving the decoction its viscous, enriching, yin-moistening character.

Minor nutritional constituents reported in the shell that contribute to its overall tonifying value.

The cleaned, dried shell is broken into pieces and added to the pot before the other herbs (cooked first, roughly 9-24 g), boiled long and hard to extract the gelatin, peptides and minerals from the dense material. Used to nourish yin, anchor ascendant yang, clear deficiency heat and steaming-bone disorder, and soften masses.

The shell is calcined or dry-fried and then quenched in rice vinegar, which makes it brittle and easier to pulverize and decoct and is said to enhance its liver-entering, blood-invigorating action of softening and dissipating hard nodules and abdominal masses (as in hepatosplenomegaly). This is the preferred form when the goal is to break up masses.

The processed shell ground to a fine powder for use in pills and powders (e.g., within the classical formula Biejiajian Wan), allowing lower, more convenient dosing than decoction.

Patients with hepatitis B liver cirrhosis/fibrosis were randomized to entecavir plus the Carapax Trionycis-containing Biejiajian Pill (3 g three times daily) or entecavir plus placebo for 48 weeks. The Biejiajian Pill arm showed modulation of intestinal microbiota that correlated with improvement in liver fibrosis parameters, supporting the traditional antifibrotic, mass-softening use of the formula.

A heptapeptide (GAGPHGG, designated OC1) isolated from Carapax trionycis significantly protected mice against carbon-tetrachloride-induced acute liver injury, outperforming the reference hepatoprotectant bifendate on serum markers and histology, apparently by reducing oxidative stress and enhancing antioxidant enzyme activity.

A low-molecular-weight (<6 kDa) Carapax Trionycis extract inhibited activation and proliferation of TGF-beta1-stimulated HSC-T6 hepatic stellate cells, lowering collagen I and alpha-smooth-muscle-actin expression and downregulating the TGF-beta1/Smad and NF-kappaB pathways, delineating a molecular mechanism for the herb's antifibrotic action.

Lists Bie Jia among the medicinals, indicating it for abdominal masses and accumulations (zheng jia), malarial disorders and hardenings, establishing its foundational mass-softening use.

Source of Biejiajian Wan (Turtle Shell Decoction Pill), a formula built around Bie Jia to treat malarial masses and palpable abdominal accumulations, the archetypal use of the herb for softening hardness.

Uses Bie Jia in Qing Hao Bie Jia Tang to clear lingering deficiency heat from the yin level and reduce steaming-bone fever, exemplifying its yin-nourishing, deficiency-heat-clearing role.