Gynura root induces hepatic veno-occlusive disease: A case report and review of the literature

Abstract

Gynura root has been used extensively in Chinese folk medicine and plays a role in promoting microcirculation and relieving pain. However, its hepatic toxicity should not be neglected. Recently, we admitted a 62-year old female who developed hepatic veno-occlusive disease (HVOD) after ingestion of Gynura root. Only a few articles on HVOD induced by Gynura root have been reported in the literature. It is suspected that pyrrolizidine alkaloids in Gynura root might be responsible for HVOD. In this paper, we report a case of HVOD and review the literature.

Key Words: Hepatic veno-occlusive disease, Gynura root

INTRODUCTION

Hepatic veno-occlusive disease (HVOD) is a clinical syndrome characterized by hyperbilirubinemia, painful hepatomegaly and weight gain due to fluid retention, after hematopoietic stem cell transplantation (HSCT), HVOD is a well-recognized life threatening complication, with an incidence rate of 10% to 60%[1]. In 1920, Willmot and Robertson[2] reported that HVOD is associated with the ingestion of Senecio tea, which contains pyrrolizidine alkaloids (PA). Other herb or plant medicine containing PA has been reported to cause hepatic injury and hepatic sinusoidal-obstruction syndrome[3]. A few cases of HVOD relating to Gynura root usage have been reported in Chinese literature[4-9]. Gynura root has been used extensively in Chinese folk medicine and plays a role in promoting microcirculation and relieving pain and curing injury.

Recently, we admitted a 62-year old female who presented with ascites, abdominal distention and was finally confirmed to have HVOD. This patient had a history of ingestion of Gynura root and experienced series of diagnostic approaches and various therapies. Since Gynura root or its analog may be used elsewhere in the world, we report the case and review the literature.

CASE REPORT

A 62-year old woman was admitted on January 23, 2006 to Hepato-gastroenterology Department of our hospital with abdominal complaints. She had abdominal distention after eating for about 10 mo. An abdominal ultrasound examination at a local hospital showed no remarkable findings. She had upper abdominal pain and weight gain in recent 3 mo. One week ago, abdominal pain became more severe, and repeated ultrasound examination revealed hepatomegaly and ascites. She had no fever and night sweats, no contact with sick persons or animals. Past medical history revealed asthma for over 20 years, which was treated occasionally with inhaler. She had no history of liver disease, alcohol abuse, pulmonary tuberculosis (TB). Family history was not significant.

Her initial vital signs were normal. Physical examination showed abdominal distention with upper abdominal tenderness, mildly dilated superficial abdominal veins, hepatomegaly (liver 7 cm below the xiphoid process), but no palpable spleen. Lower extremities showed no peripheral edema.

Laboratory tests showed normal hemoglobin (13.7 g/dL), normal WBC count (4700/μL), normal differentiatiation, but low platelets of 75 000/μL. Serum total protein (62.1 g/L) and albumin (31.9 g/L) were slightly below normal (protein normal range 63-82 g/L, Albumin 35-53 g/L). Other liver function tests showed normal total bilirubin, direct bilirubin, alanine aminotransferase and gammaglutamyl transferase, but slightly elevated aspartate aminotransferase 38 U/L (normal 5-35 U/L) and alkaline phosphatase 122 U/L (normal 30-110 U/L). Prothrombin time was normal and hepatitis B/C serology was negative. Serum tumor markers of alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA) and CA-199 were all normal but cancer antigen 125 (CA-125) was elevated (49.87 U/mL, normal range < 35 U/mL). Examination of ascetic fluid showed that the fluid was like exudate and transudate in appearance. The albumin level was elevated (20 g/L). The serum-ascites albumin gradient (SAAG) was 11.9 g/L. The ascitic cytology was negative for malignancy. Ziehl-Neelsen stain of the ascites was negative for TB. PPD test was negative.

An abdominal computerized tomography (CT) revealed hepatomegaly and residual ascites. No hepatic veins were visualized, suggesting that there was obstruction of hepatic vein outflow. No abnormality was seen in the pancreas, spleen, mesentery, retroperitoneal and pelvic organs. A digital subtraction angiography (DSA) showed normal left and right hepatic veins. There was no stricture or obstruction of the inferior vena cava, hepatic artery and portal vein. The patient was treated symptomatically with fluid restriction, diuretics,and albumin.

On her 23^rd day of hospitalization (Feb 14), because of lack of clinical improvement and uncertainty of her diagnosis, exploratory laparoscopy was performed. At operation, about 3000 mL ascites was removed. Pelvic organs (uterus, ovaries and tubes), small and large intestines, stomach, omentum and diaphragm were normal. The liver appeared diffusely congested and the left lobe lateral segment was enlarged. Portal venous pressure of about 24 mmHg was measured in a branch of the mesenteric vein. Two biopsies of the liver were taken and histology showed that the central and sublobular veins and hepatic sinus were prominently congested and dilated. Hepatic cells appeared atrophic and degenerated. The walls of sublobular veins were thickened, and the hepatic venules revealed significant fibrosis. Based on the clinical manifestations and these histological findings, HVOD was confirmed.

One week later, because of increased abdominal distension and edema of lower legs and perineum, contrast enhanced timing robust angiography (ceMRA) was done showing narrowing of hepatic veins, uneven distribution of contrast material in hepatic parenchyma, suggesting venous congestion. The inferior vena cava, portal vein, abdominal aorta, and bilateral renal arteries appeared to be normal.

She had ingested Gynura root (tu san qi) for 3 mo before admission to our hospital for neck pain secondary to cervical osteophyte. She was treated with 3 slices of fresh Gynura root a day (about 2 g/d) soaked in rice wine in a bowl. Then she placed the bowl in a pot with water and steamed it. She ate the Gynura root and drank the wine. During the three months, she did not receive any Western medication and any other herbal remedy. We planted the Gynura root till it was full grown (Figure 1). The plant was identified as gynura segetum.

Figure 1 Gynura root and its plant gynura segetum (Lour. ) Merr.

The patient was then treated with low molecular weight heparin and prostaglandin E1 and diuretics, etc, but her symptoms did not improve. Since methylprednisolone was tried for three weeks without much better effect, a transjugular intrahepatic portosystemic shunt (TIPS) was attempted on Mar 17. The puncture wire and needle could be passed through the hepatic veins into the portal vein branches. However, the stent could not be inserted because of the narrowing portal branches. TIPS failed. After a series of supportive therapy and consultations, the patient was transferred to the Surgery Department to undergo laparotomy and a mesocaval shunt was performed on Mar 29, 2006. At operation, the liver was found to be diffusely congested, the superior mesenteric vein was connected to the inferior vena cava with a 10 mm Gore-Tex graft. Initially, mesenteric venous pressure was 26 mm Hg. After the shunt was in place, the venous pressure decreased to 17 mmHg. After surgery, the patient received treatment with antibiotics, anticoagulant and tapering of her steroids. Anticoagulant was started from the 3^rd post-operative day for 5 d, oral medication for two weeks, then subcutaneously for two more weeks. Two weeks post-operation, the patient developed pneumonia, treated and was discharged one month later. During follow-up examination in June of 2006, she had no abdominal distention nor pain. Repeated abdominal ultrasound study showed no ascites and the liver size was normal.

DISCUSSION

Since Gynura root is widely used in Chinese folk medicine, we searched the main Chinese medical database and found 6 Chinese publications with 21 cases of Gynura root-related HVOD[4-9], 11 of them were confirmed by liver biopsy or autopsy. The clinical characteristics of the Gynura root-related HVOD patients are summarized in Table 1. All the patients presented with hepatomegaly and ascites. Two patients died after ingestion of high doses of Gynura root (450 g and 1800 g within 10 d and 50 d respectively)[4]. Most of the patients had elevated total bilirubin, and only a few cases had a normal total bilirubin.

Table 1 Clinical characteristics of patients with Gynura root-related HVOD.

Reference	Sex	Age(yr)	Reason for useof gynura root	duration	Total gynura(gram)	Total bilirubin(nl range4)	Special testsof HVOD	Therapy forHVOD	Outcome
Hou JG, 1980[4]	M	57	Coronary heart disease	About 10 d	450	Normal	Autopsy	Symptomatic	Died 5-d after admission
	F	48	Diabetes	About 50 d	1800	4.5 mg%	Ultrasound, liver scan, autopsy	Symptomatic	Died
Li JP 2001[5]	M	53	No detail	No detail	No detail	53.1 μmol/L (0-20.4)	Ultrasound, MRI, Biopsy	In situ liver transplantation	Well
Li ZM, 2005[6]	M	43	Back ache	20 d	150	No report	Ultrasound MRI, DSA, Biopsy	Methylprednisolone 40 mg IV q 12 h	Well
Chen WX, 2005[7]	M	52	After a fall	4 mo	3601	27 μmol/L (0-20.4)	Ultrasound, CT, Biopsy	In situ liver transplantation	Well 45-d after operation
	F	39	Trauma	3 mo	1802	25 μmol/L (0-20.4)	Ultrasound CT, Biopsy	Symptomatic treatment	Discharged without improvement
Yan Hong 2005[8]	M	29	nephrolith	20 d	200	No report	Ultrasound, CT, DSA, Biopsy	Prednisone	Well
Our case	F	62	Neck pain	3 mo	1803	17 μmol/L (0-20.4)	Ultrasound, CT, DSA, Biopsy, ceMRA	Mesocaval shunt	Well 2-mo later
Zhang GH 2006[9]	M6, F8	41-73	Trauma or fracture	5 d (mean)	300-700	Elevated in 12 cases	All had ultrasound, CT; 4 cases biopsy; 2 cases DSA	Low molecular weight heparin, aspirin and diuretics	Well

¹Calculated from author’s data of 3 gm/d for four months;

²Calculated from author’s data of 2 gm/d for three months;

³Estimated from patient’s description of 3 slices a day for three months;

⁴nl range: abbreviation of normal level range.

HVOD which was first described in 1920 by Willmot and Robertson[2] is associated with the ingestion of Senecio tea containing pyrrolizidine alkaloids (PA). In 1953, Hill et al[10] reported a large series of 150 Jamaican children who developed hepatic HVOD after drinking Senecio tea. More than 300 kinds of PA have been identified in over 6000 plants of the Compositae, Boraginaceae and Leguminosae families[3]. Gynura root belongs to the Compositae family.

Yuan et al[11] isolated six alkaloids from Gynura segetum (Lour.) Merr. Two of the six were identified as senecionine and seneciphylline, which are known to have hepatic toxicity. These PAs, which have minimal toxicity in their original form, are metabolized in the liver through CYP (P450 cytochrome) and become toxic metabolites. The latter can act on local liver cells to cause damage by cross-linking DNA[12,13]. Furthermore, PA can decrease glutathione (GSH) in sinusoidal endothelial cells[14]. This enhanced oxidative stress also can affect collagen α1 transcription directly and/or through the activation of hepatic stellate cells[15], finally leading to HVOD. If the liver becomes damaged, the pyrrolizidine metabolites can overflow and infiltrate the lung fluids and cause damage there. Pulmonary edema and pleural effusions may occur, sometimes resulting in fatalities with very high levels of PA ingestion[13].

Confirmation of HVOD is based on the histology examination of liver tissue. The hepatic sinus, central and sublobular vein are significantly congested and dilated in Gynura root-related HVOD, while the venular walls are thickened with collagen deposition, with or without infiltration of lymphocytes, monocytes and neutrophils with fatty degeneration and necrosis presented in hepatic cells[4-9].

Currently, various strategies are used for the treatment of HVOD. For herb-related HVOD, plants containing PA should be avoided and discontinued. Some patients may recover after symptomatic treatment such as fluid restriction, diuretics and albumin. Administration of methylprednisolone seems to be another favorable alternative for some HVOD patients[6,16]. For patients with serious HVOD who do not respond to medical therapy, early use of transjugular intrahepatic portosystemic shunt (TIPS) can be considered[17]. However, it was reported that TIPS should not recommended for patients with HVOD[17,18]. In our patient, TIPS was not performed and she recovered well after undergoing meso-caval shunt. The value of porto-systemic shunt in HVOD remains to be further investigated. For those critically ill patients without response to porto-systemic shunt, liver transplantation might be considered with a survival rate of about 30%[19]. Li et al[6] and Chen et al[7] reported that two male cases of Gynura-root related HVOD recovered well over 40 d after liver transplant for hepatic failure.

Some researchers have suggested that PAs related safety problems are more widespread in certain areas of the world, such as Africa and South America[13]. Gynura root-related HVOD may be more widespread in China as well. Eighteen of these 22 patients （including our patient） were residents of Zhejiang Province, eastern coastal China, where more concerns are paid on Gynura root-related HVOD through organized case discussions between hospitals. Supervision and instruction of PA content in herbal medicine are crucial. The German Health Administration has set a standard for the use of herb petasites[13]. Further measures should be taken to determine and supervise herbs containing PAs to reduce their toxic effect, and make plentiful use of the Chinese traditional herbal medicine.

ACKNOWLEDGMENTS

The authors thank Yeu-Tsu Margaret Lee, MD, FACS, Department of Surgery, School of Medicine, University of Hawaii, USA and professor Pe-Hsun Tung, Department of Surgery, Washington County Hospital for their assistance in preparing this paper. We also thank Professor You-Fa Zhu, Department of Pathology, College of Medicine, Zhejiang University for his technical support in the histological examination.