Objective:To investigate the protective effect of lactoferrin(Lf) on lung injury in mice exposed to irradiation.Methods:C57BL/6 J mice were randomly divided into control group, 15 Gy irradiation group (IR group) and lactoferrin combined 15 Gy irradiation group (Lf+ IR group), with 5 mice in each group. The mice in the Lf+ 15 Gy group drank lactoferrin solution (10 mg/ml) from 3 days before irradiation and contained the whole experiments. Then, single chest 15 Gyirradiation was performed both in the IR and Lf+ IR groups. The body weight and other characteristics were monitored during the experiment. The mice were killed at day 14 after irradiation. The lung histopathology was observed by HE staining. Serum inflammatory cytokine such as HMGB1, TNF-α, IL-1β and IL-6 was determined by ELISA method . The expression of inflammatory related protein in lung tissue including HMGB1, TLR4, MyD88 and NF-κB were performed by immune histochemistry and Western blot method.Results:Compared with the control group, lung weight was significantly increased ( t=3.20, P<0.05), pulmonary hyperemia and inflammatory cell infiltration was observed in the IR group. Exposure also significantly increased serum level of TNF-α[(291.80±5.49) vs.(332.25±22.18)pg/ml]( t=3.07, P<0.05), up-regulated the expression of inflammatory related protein in lung tissue ( t=4.04, 4.78, 3.77, 6.14, P<0.05). Lactoferrin intervention (Lf+ IR group) significantly decreased lung weight ( t=2.18, P<0.05), alleviated histopathologic changes, decrease serum levels of HMGB1, TNF-α and IL-1β ( t=4.67, 2.97, 3.49, P<0.05). On the other hand, lactoferrin intervention decreased the positive cell number of HMGB1 and NF-κB, and down-regulated the protein expression of HMGB1, TLR4, MyD88 and NF-κB in lung tissues, with significant difference with the IR group ( t=8.06, 9.80, 3.07, 5.56, P<0.05). Conclusions:Lactoferrin plays the protective effect of radiation-induced lung injury through the downregulation of inflammatory response, such as HMGB1/TLR4/MyD88/NF-κB signaling pathway.

Objective:To investigate the application of side branch protection technique in interventional treatment of intracranial arteriosclerosis stenosis.Methods:We reviewed the patients who underwent interventional treatment of intracranial arteriosclerosis stenosis from November 2018 to May 2021 in Affiliated Drum Tower Hospital of Nanjing University Medical School, and analyzed the role of side branch protection technique in the prevention and treatment of complications. Relevant evaluation indicators including: (1) imaging: patency of blood flow in target vessels and branch vessels; (2) clinical presentation: ischemic stroke or transient ischemic attack (TIA) events within 72 hours and one month follow-up results.Results:A total of 9 patients underwent side branch protection during interventional treatment for intracranial arteriosclerosis stenosis, the blood flow of target vessels was improved obviously after operation, and the blood flow of the affected branches was not affected; no stroke or TIA events occurred in 72 hours after operation and one month follow up.Conclusions:Proper application of side branch protection technique can reduce the perioperative complications effectively during the interventional treatment for intracranial arteriosclerosis stenosis.

Objective:To investigate the effect of the number of retrieval attempts on the outcomes after successful recanalization of mechanical thrombectomy in patients with acute ischemic stroke.Methods:Patients with acute large vessel occlusive ischemic stroke underwent mechanical thrombectomy and successful postoperative recanalization in the Stroke Center of Nanjing Drum Tower Hospital, the Affiliated Hospital of Nanjing University Medical School from January 2019 to May 2020 were retrospectively enrolled. According to the number of retrieval attempts during the procedure, the patients were divided into <3-attempt group and ≥3-attempt group. The demographic data, procedure-related indexes, periprocedural complications and outcomes at 90 d after the procedure were compared between the two groups.Results:A total of 106 patients, aged 69.8±1.3 years, were enrolled, and 55 were males (51.9%). Eight-three patients (78.3%) were in the <3-attempt group, and 23 (21.7%) were in the ≥3-attempt group. Forty-one patients (38.7%) had good outcomes (the modified Rankin Scale score ≤2) at 90 d, and 11 (10.4%) died. There were no significant differences in the incidence of intracranial hemorrhage (30.4% vs. 20.5%; χ2=1.019, P=0.313), the good outcome rate at 90 d (34.8% vs. 39.8%; χ2=0.188, P=0.665) and mortality (8.7% vs. 10.8%; P=0.999) between the ≥3-attempt group and <3-attempt group, but the incidence of symptomatic intracranial hemorrhage was significantly higher than that in the <3-attampt group (13.0% vs. 1.2%; P=0.031). Multivariate logistic regression analysis showed that the number of retrieval attempts was not significantly associated with poor outcome. Conclusion:The more retrieval attempts may be related to symptomatic intracranial hemorrhage, but it does not affect the clinical outcomes of patients with successful recanalization at 3 months.

ChatGPT, as a high-profile generative large language model (LLM) of artificial intelligence(AI), brings people immersive learning experience and a unique interactive platform; meanwhile, it provides an innovative tool and new opportunities for the development in many fields. With the increasing importance of radiation medicine in disease diagnosis and treatment, manned spaceflight, and nuclear energy and nuclear technology, it can be foreseen that AI LLMs like ChatGPT will play an important role in the development of radiation medicine. This article reviews the application prospects and challenges of ChatGPT in radiation medicine, aiming to promote the application research of AI LLMs in radiation medicine.