Case of Hemorrhagic Fever with Renal Syndrome in Jeju Island / 감염과화학요법

Hemorrhagic fever with renal syndrome (HFRS) caused by the Hantann virus occurs frequently in Korea. On the other hand, the incidence of HFRS is very low in Jeju Island. A 62-year-old man was transferred from another hospital because of persistent fever, myalgia, generalized edema, epigastric pain, conjunctival injection, costovertebral angle tenderness, thrombocytopenia and azotemia. On the second hospital day, he exhibited oliguric symptoms. His urine output increased from the fourth hospital day. The test for the anti-Hantaan virus antibody was positive. Finally, he was diagnosed with HFRS and recovered with conservative management. HFRS should be considered when acute renal failure develops in patients with fever and thrombocytopenia in Jeju Island.

The use of Stronger Neo-Minophagen C, a glycyrrhizin-containing preparation, in robust neuroprotection in the postischemic brain / 대한해부학회지

Stronger Neo-Minophagen C (SNMC) is a glycyrrhizin-containing preparation that is approved in Japan for the treatment of chronic hepatic diseases and is marketed in Japan, China, Korea, Taiwan, and India. Glycyrrhizin, a triterpene present in the roots and rhizomes of licorice (Glycyrrhiza glabra) has been shown to have anti-inflammatory, anti-oxidative, and anti-viral effects. In the present study, we demonstrated the marked neuroprotective effects of SNMC in the postischemic rat brain after middle cerebral artery occlusion (MCAO). We used 1 ml/kg of SNMC, which is within the dose range used for the treatment of patients with chronic hepatic disease. The administration of SNMC intravenously at 30 minutes before or 30 minutes and 3 hours after MCAO (60 minutes) reduces mean infarct volumes to 27.0+/-4.2%, 37.1+/-12.4%, and 67.8+/-5.8% of that of untreated controls, respectively. This neuroprotective effect is accompanied by improvements in motor impairment and neurological deficits. The administration of SNMC is shown to suppress microglia activation and neutrophil infiltration in the postischemic brain. In addition, SNMC suppresses lipopolysaccharide-induced nitrite production and proinflammatory cytokine induction in a microglia cell line, BV2. This indicates that the neuroprotective effect of SNMC might be due, at least in part, to an anti-inflammatiory effect. Interestingly, SNMC shows significantly higher neuroprotective potency compared to an equivalent dose of pure glycyrrhizin, in terms of reducing infarct volume and improving neurological deficits. Together these results indicate that SNMC, a glycyrrhizin-containing preparation developed for chronic liver disease, has a marked neuroprotective function in the postischemic brain via its anti-inflammatory effects.

Extracellular HMGB1 Released after Zinc-treatment Induces Neuronal Death in Primary Cortical Cultures / 대한해부학회지

As a nonhistone DNA-binding protein, high mobility group box 1 (HMGB1) is released in large amounts into the extracellular space immediately after ischemic insult and plays a role in the release of proinflammatory cytokines. Here, we the examined cytokine-like or signaling molecule-like function of extracellular HMGB1 in primary cortical cultures. We found that a large amount of HMGB1 was released following zinc-induced neuronal cell death in primary cortical cultures and that this extracellular HMGB1 might aggravate neuronal damage. The conditioned media collected from zinc-treated primary cortical cultures decreased neuronal cell survival to 69.6+/-1.4% of control values when added to fresh primary cortical cultures. In contrast, treatment with HMGB1-depleted conditioned media produced by cultures treated with an HMGB1 siRNA-expression vector suppressed the induction of neuronal death. A mutant HMGB1 siRNA-expression vector did not suppress the induction of neuronal death, demonstrating a role of HMGB1 in neuronal death. Moreover, HMGB1-depletion in media conditioned by cotreatment with anti-HMGB1 antibody or with anti-RAGE antibody, a potential receptor for HMGB1, recovered neuronal cell survival to 81.0+/-4.0% and 79.0+/-4.0%, respectively, when added to fresh primary cortical cultures. These results indicate that extracellular HMGB1 released after zinc treatment induces neuronal death, which might aggravate zinc toxicity.