An essential function for beta-arrestin 2 in the inhibitory signaling of natural killer cells.

The inhibitory signaling of natural killer (NK) cells is crucial in the regulation of innate immune responses. Here we show that the association of KIR2DL1, an inhibitory receptor of NK cells, with beta-arrestin 2 mediated recruitment of the tyrosine phosphatases SHP-1 and SHP-2 to KIR2DL1 and facilitated 'downstream' inhibitory signaling. Consequently, the cytotoxicity of NK cells was higher in beta-arrestin 2-deficient mice but was inhibited in beta-arrestin 2-transgenic mice. Moreover, beta-arrestin 2-deficient mice were less susceptible than wild-type mice to mouse cytomegalovirus infection, an effect that was abolished by depletion of NK cells. Our findings identify a previously unknown mechanism by which the inhibitory signaling in NK cells is regulated.

[A Case of Congenital Gastroschisis Repair of a Newborn Following the Cesarean Section].

A 21-year-old woman was admitted at 35 +4 weeks due to disappearance of fetal movement for one day. The ultrasound from other hospital indicated fetal gastroschisis. Abdominal ultrasound in our hospital confirmed that the discontinuity of the fetal abdominal wall by 4.5 cm. The stomach and part of the intestine were herniating into the amniotic cavity. Considering the possibility of gastroschisis and fetal distress, electronic fetal monitoring was implemented continuously and consultations of relevant departments were called immediately, including anesthesiology, neonatology and general pediatric surgery. After Cesarean section under general anesthesia, pediatric surgeons performed an intrapartum surgery for the neonate. The tension of abdominal wall was slightly higher after the operation, but had no significant negative effect on ventilation. After surgery, the neonate was transferred to neonatal pediatrics for further treatments. The abdominal distention of the neonate relieved gradually. The patient was discharged after receiving full enteral nutrition without any discomfort. It was found in the follow-up that the patient had no discomforts such as infection, wound dehiscence, intestinal necrosis, abdominal hernia or other complications. The prenatal examinations should be completed and the pregnant mother of gastroschisis fetus should be transferred to the experienced center where the intrapartum surgery or early stage I repair surgery is possible for the neonate.