大鼠卵泡发育过程中基质金属蛋白酶-2，-9的作用

目的：探讨基质金属蛋白酶-2,-9（MMP-2,-9）在大鼠卵泡发育的组织重建中的作用。方法：采用原位杂方法检测动情周期大鼠卵泡中MMP-2,-9mRNAs的基因表达变化,并通过密度扫描方法对原位杂交结果进行半定量分析。结果：在动情周期中,各情期卵巢中卵泡的颗粒细胞和发育良好的卵泡的膜细胞中均可检测到MMP-2m-RNA的杂交信号;MMP-9mRNA的表达始于已发育良好的窦前卵泡的膜细胞,此后在小窦状卵泡、窦状卵泡及排卵前卵泡的膜细胞中均检测到MMP-9mRNA的杂交信号。结论：MMP-2,-9可能通过其基因的表达变化参与卵泡的发育过程。     

少突胶质细胞对PC12细胞JAK2基因表达的影响及其意义

目的 探讨少突胶质细胞对PC12细胞JAK2基因表达的影响及其意义。方法 用分离培养的少突胶质细胞及其细胞碎片分别作用于培养的PC12细胞,于不同作用时相点在观察PC12细胞突起变化的同时检测PC12细胞内JAK2mRNA的表达JAK2蛋白的磷酸化。结果 在给予少突胶质细胞及其细胞碎片处理后10min,JAK2 mRNA表达较对照组有显著增高（P＜0．05）,但处理12h后,其表达虽较处理10min及4h有显著下降,但仍显著高于对照组（P＜0．05）。对照组JAK2蛋白的活性较低,但少突胶质细胞及其细胞碎片加入后,JAK2蛋白很快便被磷酸化而激活,到处理后12h,激活的蛋白呈较处理10min有显著下降,但仍显著高于正常对照组（P＜0．05）。少突胶质细胞及其细胞碎片对其影响差别不显著（P＞0．05）。结论 少突胶质细胞作用于PC12细胞时可调节PC12细胞JAK2的表达与激活,这种表达与激活在一定程度上可能介导少突胶质细胞对PC12细胞突起生长的影响。     

PCR辅助转录滴定系统定量检测AFP mRNA方法的建立

目的：建立ＰＣＲ辅助转录滴定系统（ＰＡＴＴＹ）定量检测ＡＦＰ ｍＲＮＡ的方法。方法：采用ＲＴ－ＰＣＲ定点替代突变及体外转录技术合成单碱基突变ＡＦＰ ｍＲＮＡ内竞争模板,以竞争性ＲＴ－ＰＣＲ定量检测各肝癌细胞株ＡＦＰ ｍＲＮＡ,结果：成功制备引入ＨｉｎｄⅢ酶切位上为的单碱基突变ＡＦＰ ｍＲＮＡ内竞争模板,建立ＰＡＴＴＹ定量检测ＡＦＰ ｍＲＮＡ的方法;检测１μｇＨｅｐＧ２和Ｈｕｈ７两株肝癌细胞总ＲＮＡ     

肺癌与非恶性疾病患者的肺组织c-fos、c-jun基因表达研究

探讨ｃ－ｆｏｓ、ｃ－ｊｕｎ癌基因与肺癌的关系。方法：采用ＰＴ－ＰＣＲ方法检测肺癌与非恶性肺疾病患者病变组织及正常肺组织中ｃ－ｆｏｓ、ｃ－ｊｕｎ ｍＲＮＡ表达。结果：ｃ－ｆｏｓ、ｃ－ｊｕｎ ｍＲＮＡ在两患者病变组织中的表达均明显高于正常组织（Ｐ〈０．００１）,在肺癌组织中的表达又高于肺良性肿块组织（Ｐ〈０．０５）。而且在小细胞肺癌和腺癌组织表达强于鳞癌组织（Ｐ〈０．００１）。结果：ｃ－ｆｏｓ、ｃ－ｊ     

心室成纤维细胞条件培养液促进成纤维细胞增殖

目的：探讨心室成纤维细胞条件培养液成纤维细胞自身增殖作用。方法：利用成纤维细胞培养、同位素掺入率测定和RT－PCR方法。结果：心室成纤维细胞条件培养液能显增加细胞自身的[^3H]-胸腺嘧啶核苷的掺入率,并具有剂量依赖性,促进细胞自身的c-fos基因的表达,刺激后1h达高峰。ETA受体拮抗剂BQ123能部分阻断条件培养液增加成纤维细胞增殖的作用,而AT1受体拮抗剂CV11974和（α-肾上腺素受体拮抗剂regitin无此效果。结论：心室成纤维细胞能自分泌内皮素等生物活性物质,促进成纤维细胞增殖。     

Single-cell transcriptome atlas reveals protective characteristics of COVID-19 mRNA vaccine

Messenger RNA (mRNA) vaccines are promising alternatives to conventional vaccines in many aspects. We previously developed a lipopolyplex (LPP)-based mRNA vaccine (SW0123) that demonstrated robust immunogenicity and strong protective capacity against severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) infection in mice and rhesus macaques. However, the immune profiles and mechanisms of pulmonary protection induced by SW0123 remain unclear. Through high-resolution single-cell analysis, we found that SW0123 vaccination effectively suppressed SARS-CoV-2-induced inflammatory responses by inhibiting the recruitment of proinflammatory macrophages and increasing the frequency of polymorphonuclear myeloid-derived suppressor cells. In addition, the apoptotic process in both lung epithelial and endothelial cells was significantly inhibited, which was proposed to be one major mechanism contributing to vaccine-induced lung protection. Cell−cell interaction in the lung compartment was also altered by vaccination. These data collectively unravel the mechanisms by which the SW0123 protects against lung damage caused by SARS-CoV-2 infection.     

Vaccine-induced binding and neutralizing antibodies against Omicron 6 months after a homologous BNT162b2 booster

Evidence about the long-term persistence of the booster-mediated immunity against Omicron is mandatory for pandemic management and deployment of vaccination strategies. A total of 155 healthcare professionals (104 COVID-19 naive and 51 with a history of SARS-CoV-2 infection) received a homologous BNT162b2 booster. Binding antibodies against the spike protein and neutralizing antibodies against Omicron were measured at several time points before and up to 6 months after the booster. Geometric mean titers of measured antibodies were correlated to vaccine efficacy (VE) against symptomatic disease. Compared to the highest response, a significant 10.2- and 11.5-fold decrease in neutralizing titers was observed after 6 months in participants with and without history of SARS-CoV-2 infection. A corresponding 2.5- and 2.9-fold decrease in binding antibodies was observed. The estimated T_1/2 of neutralizing antibodies in participants with and without history of SARS-CoV-2 infection was 42 (95% confidence interval [CI]: 25–137) and 36 days (95% CI: 25–65). Estimated T_1/2 were longer for binding antibodies: 168 (95% CI: 116–303) and 139 days (95% CI: 113–180), respectively. Both binding and neutralizing antibodies were strongly correlated to VE (r = 0.83 and 0.89). However, binding and neutralizing antibodies were modestly correlated, and a high proportion of subjects (36.7%) with high binding antibody titers (i.e., >8434 BAU/ml) did not have neutralizing activity. A considerable decay of the humoral response was observed 6 months after the booster, and was strongly correlated with VE. Our study also shows that commercial assays available in clinical laboratories might require adaptation to better predict neutralization in the Omicron era.     

间歇性气囊挤压大鼠腿部对挤压部位和远端骨骼肌一氧化氮合酶mRNA表达的影响

目的:为了进一步了解间歇性气囊挤压法(Intermittent pneumatic compression, IPC)挤压大鼠腿部与一氧化氮(NO)的关系.方法:检测了大鼠骨骼肌中3种一氧化氮合酶(NOS)同工酶:神经型NOS(nNOS);诱导型NOS(iNOS)和内皮细胞型NOS(eNOS)mRNA在IPC作用后的表达变化.25只SD大鼠被随机分为3个模拟实验组和4个IPC实验组.每只鼠取右侧胫前肌(AT)和提睾肌(CM)作为正常对照.IPC组挤压0.5,1,和5h,及挤压5h加等待4h,模拟实验组除不挤压外,其他操作均与实验组相同,然后分离左侧AT和CM作为处理后样品.所有样品应用RT-PCR进行NOS mRNA测定.以样品中看家基因2,3-二羟基丙醛-3-磷酸脱氢酶(GAPHD)cDNA为内参,与NOS cDNA 共同扩增.PCR产物电泳条带密度用NIH图像分析软件定量,并以与正常对照的对比值作为变化比率.结果:在IPC作用0.5、1和5h后,eNOS mRNA显著上升,在AT中分别达到正常对照的1.2,1.8和2.6倍;在CM中分别达到1.2,1.8和2.7倍,而其他NOS,除5hIPC组的nNOS外,总体表现下调.在IPC作用1h加等待4h组中,eNOS mRNA回复至正常对照水平.结论:该结果证实了IPC产生的机械压力至少部分增加了血管壁的剪切压,使内皮细胞增加了NO产物的释放量,导致了挤压部位及远端肌肉的血管扩张和改善了微循环.     

He-Ne激光重复照射抑制培养增生性瘢痕成纤维细胞胶原合成的实验研究

目的 探讨Ｈｅ－Ｎｅ激光重复照射对培养增生性瘢痕成纤维细胞胶原合成的抑制作用。方法 以不同功率密度（１０、５０、１００和１５０ｍＷ／ｃｍ＾２）Ｈｅ－Ｎｅ激光照射培养增生性瘢痕成纤维细胞３０ｍｉｎ,１／ｄ,连续照射３ｄ,在３ｄ重复照射后２４ｈ用＾３Ｈ－脯氨酸掺入法和斑点杂交法分别检测成纤维细胞胶原合成和Ⅰ型前胶原基因表达。结果 培养增生性瘢痕成纤维细胞的胶原合成、Ⅰ型前胶原基因表达水平在１０、５０ｍ