Impact of continuous care on cardiac function in patients with lung cancer complicated by coronary heart disease.

BACKGROUND: Despite sharing similar pathogenic factors, cancer and coronary heart disease (CHD) occur in comparable populations at similar ages and possess similar susceptibility factors. Consequently, it is increasingly commonplace for patients to experience the simultaneous occurrence of cancer and CHD, a trend that is steadily rising. AIM: To determine the impacts of continuing care on lung cancer patients with CHD following percutaneous coronary intervention (PCI). METHODS: There were 94 lung cancer patients with CHD following PCI who were randomly assigned to the intervention group (n = 38) and the control group (n = 41). In the intervention group, continuing care was provided, while in the control group, routine care was provided. An evaluation of cardiac and pulmonary function, medication compliance, a 6-min walk test, and patient quality of life was performed. RESULTS: Differences between the two groups were significant in left ventricular ejection fraction, 6-min walk test, oxygen uptake, quality of life and medication compliance (P < 0.05). In comparison with the control group, the enhancement in the intervention group was more significant. The intervention group had more patients with high medication compliance than the control group, with a statistically significant difference (P < 0.05). CONCLUSION: After undergoing PCI, lung patients with CHD could benefit from continued care in terms of cardiac and pulmonary function, medications compliance, and quality of life.

Demography and Fitness of Anastatus japonicus Reared from Antheraea pernyi as a Biological Control Agent of Caligula japonica.

Japanese giant silkworm (JGS), Caligula japonica Moore, is an emerging defoliator pest of forest and fruit trees in East Asia, causing severe economic losses. To develop a cost-effective biological control program against JGS, we used eggs of the Chinese oak silkworm (COS) Antheraea pernyi Guérin-Méneville as an alternative host to rear the most dominant JGS egg parasitoid Anastatus japonicus Ashmead. We compared the demographic parameters and total parasitism (killing) rates of A. japonicus parasitizing JGS and COS eggs using an age-stage, two-sex life table method. The results showed that A. japonicus performed differently on these two different hosts. Anastatus japonicus reared from COS eggs had a higher fecundity (369.7 eggs per female) and a longer oviposition period (35.9 days) on the COS than JGS eggs (180.9 eggs; 24.0 days). Consequently, A. japonicus parasitizing COS eggs had a higher intrinsic rate of increase (r = 0.1466 d-1), finite rate of increase (λ = 1.1579 d-1) and net reproductive rate (R0 = 284.9 offspring) than those parasitizing JGS eggs (r = 0.1419 d-1, λ = 1.1525 d-1, R0 = 150.0 offspring). The total net parasitism rate (the number of parasitized hosts in which the parasitoids successfully developed) of A. japonicus parasitizing COS eggs was 284.9, significantly higher than that of A. japonicus parasitizing JGS eggs (150.0), while the net non-effective parasitism rate (the number of parasitized hosts in which the parasitoids failed to develop) of the former (0.0) was significantly lower than that of the latter (9.6). These results suggest that A. japonicus can be efficiently reared on the alternative (or factitious) COS eggs, and the reared parasitoids have a high biological control potential against the target JGS.

AIDA directly connects sympathetic innervation to adaptive thermogenesis by UCP1.

The sympathetic nervous system-catecholamine-uncoupling protein 1 (UCP1) axis plays an essential role in non-shivering adaptive thermogenesis. However, whether there exists a direct effector that physically connects catecholamine signalling to UCP1 in response to acute cold is unknown. Here we report that outer mitochondrial membrane-located AIDA is phosphorylated at S161 by the catecholamine-activated protein kinase A (PKA). Phosphorylated AIDA translocates to the intermembrane space, where it binds to and activates the uncoupling activity of UCP1 by promoting cysteine oxidation of UCP1. Adipocyte-specific depletion of AIDA abrogates UCP1-dependent thermogenesis, resulting in hypothermia during acute cold exposure. Re-expression of S161A-AIDA, unlike wild-type AIDA, fails to restore the acute cold response in Aida-knockout mice. The PKA-AIDA-UCP1 axis is highly conserved in mammals, including hibernators. Denervation of the sympathetic postganglionic fibres abolishes cold-induced AIDA-dependent thermogenesis. These findings uncover a direct mechanistic link between sympathetic input and UCP1-mediated adaptive thermogenesis.

[Chronic intermittent hypoxia induces expression of phospho-PKC substrates in rat pre-Bötzinger complex].

The pre-Bötzinger complex (pre-BötC) residing in the ventrolateral medulla oblongata, is thought to be the kernel of respiratory rhythmogenesis. Episodic hypoxia exerts respiratory long-term facilitation, being recognized as electrophysiological characteristic of respiratory motor neuroplasticity. Our previous study demonstrated up-regulated expression of phospho-protein kinase C θ (P-PKCθ) in the pre-BötC of rats receiving chronic intermittent hypoxic (CIH) challenge. The present study was aimed to examine subcellular distribution of P-PKC substrates (P-PKCsub) and explore PKC down-stream targeting proteins in the pre-BötC in normoxic and CIH rats. Using neurokinin-1 receptor (NK1R) as a marker of the pre-BötC, P-PKCsub immunoreactivity was revealed by immunofluorescence and immuno-electron microscopic double-labeling in the pre-BötC. Western blot was applied to analyze P-PKCsub proteins in ventrolateral medulla, containing the pre-BötC. The results showed that NK1R immunoreactivity (NK1R-ir) was expressed mainly along plasma membranes of somata and processes, outlining pre-BötC neurons under the light microscope. P-PKCsub immunoreactive (P-PKCsub-ir) fluorophores in dot-like appearance appeared in somata and processes. Some were in close apposition to plasma membranes. A majority of P-PKCsub-ir neurons was found with NK1R-ir. CIH challenge up-regulated the expression of P-PKCsub proteins in the ventrolateral medulla. Under the electron microscope, NK1R-ir product was found to distribute along the inner membrane surfaces of somata and dendrites. P-PKCsub-ir gold particles were located in somata and dendrites, and some were distributed along the inner membrane surfaces, as well as in the endoplasmic reticulum and postsynaptic dense body. These results suggest that CIH challenge up-regulates the expression of P-PKCsub proteins, probably including some receptor proteins in the postsynaptic membrane, which may contribute to respiratory neuroplasticity via activation of PKCθ in the pre-BötC.

Enhanced High-Resolution Triboelectrification-Induced Electroluminescence for Self-Powered Visualized Interactive Sensing.

Transforming dynamic mechanical interactions into visualized luminescence represents a research frontier in the detection of tactile stimuli. Here, we report a self-powered high-resolution triboelectrification-induced electroluminescence (HR-TIEL) sensor for visualizing the contact profile and dynamic trajectory of a contact object. As dynamic interactions occur, triboelectric charges at the contact interface generate a transient electric field that excites the phosphor. From the numerical simulation, a conductive layer based on transparent silver nanowires (AgNWs) guides the direction of the electric field and confines it within the profile boundary of the connect object. As a result, a sharp change of the electric field at the profile boundary greatly promotes the luminescence intensity as well as the lateral spatial resolution. Compared to a triboelectrification-induced electroluminescence (TIEL) sensor without the conductive layer, the luminescence intensity is enhanced by 90%, and the lateral spatial resolution of ∼500 µm is achieved. The HR-TIEL sensor is then demonstrated to reveal the surface texture on a nitrile glove. It relies on neither additional power supplies nor complex wiring/circuit design. This work paves the way for the feasible detection of tactile stimuli such as touch and slipping, which will be potentially used in robotics, human-machine interface, flexible and wearable electronics, and so forth.

Moderate prenatal alcohol exposure suppresses the TLR4-mediated innate immune response in the hippocampus of young rats.

Prenatal alcohol exposure (PAE) could lead to developmental disorders of the central nervous system (CNS) and mental retardation. Toll-like receptor (TLR) 4 plays an important role in PAE-induced neurodevelopmental defects. However, how PAE affects TLR4 response in the brain remains controversial. Using a moderate PAE model by feeding pregnant rats with liquid ethanol diet, we investigated the TLR4-mediated response to intraventricular injection of lipopolysaccharide (LPS) in the hippocampus of PEA rats at postnatal day (PND) 30. The results showed that PAE significantly up-regulated the expression of Toll-Interleukin-1 Receptor (TIR)-domain-containing adaptor protein inducing interferon (IFN)-ß (TRIF), TNF-α, and IL-1ß in the rat hippocampus in the absence of LPS, indicated by western blot assay. LPS treatment dramatically up-regulated the expressions of TLR4 and its downstream molecules in the hippocampus of paired-food and control groups. But no such significant changes of those molecules were found in the hippocampus of PAE animals. Moreover, the LPS stimulation even down-regulated the levels of TLR4 and TRIF in the PAE group. These data suggest that the relatively moderate level of PAE may lead to a mild neuroinflammation and a suppression of TLR4-mediated response to LPS in the hippocampus of young rats. As innate immunity plays crucial roles in CNS development, moderate PAE-induced suppression of TLR4-mediated response may serve as a new candidate mechanism of CNS developmental defects.

Branched-Chain Amino Acids Enhance Retinal Ganglion Cell Survival and Axon Regeneration after Optic Nerve Transection in Rats.

PURPOSE: This study's aim was to investigate the beneficial effects of branched-chain amino acids (BCAAs) on the neuronal survival and axon regeneration of retinal ganglion cells (RGCs) after optic nerve (ON) transection. METHOD: The experimental rats received daily BCAA injections through the caudal vein after left intra-orbital ON transection. Neuroprotection was evaluated by counting Fluorogold-labeled RGCs. The role of mammalian target of rapamycin (mTOR) pathway activation in promoting RGC survival was studied after rapamycin administration. Moreover, a peripheral nerve (PN) graft was transplanted onto the transected ON to study the effects of BCAAs on axon regeneration of injured RGCs. RESULTS: Our results showed that BCAAs alleviated the death of RGCs 7 and 14 days after ON transection, accompanied by an activation of mTOR pathway in RGCs. Blocking mTOR pathway with rapamycin eliminated such neuroprotective effects of BCAAs. Moreover, BCAAs also promoted axon regeneration of injured RGCs into a PN graft. CONCLUSION: Our results suggest a neuroprotection of BCAAs through the activation of mTOR pathway. BCAAs also have a beneficial effect on axon regeneration of injured RGCs. Therefore, BCAAs could be considered for the clinical treatment of ON injury.

Bidirectional and long-lasting control of alcohol-seeking behavior by corticostriatal LTP and LTD.

Addiction is proposed to arise from alterations in synaptic strength via mechanisms of long-term potentiation (LTP) and depression (LTD). However, the causality between these synaptic processes and addictive behaviors is difficult to demonstrate. Here we report that LTP and LTD induction altered operant alcohol self-administration, a motivated drug-seeking behavior. We first induced LTP by pairing presynaptic glutamatergic stimulation with optogenetic postsynaptic depolarization in the dorsomedial striatum, a brain region known to control goal-directed behavior. Blockade of this LTP by NMDA-receptor inhibition unmasked an endocannabinoid-dependent LTD. In vivo application of the LTP-inducing protocol caused a long-lasting increase in alcohol-seeking behavior, while the LTD protocol decreased this behavior. We further identified that optogenetic LTP and LTD induction at cortical inputs onto striatal dopamine D1 receptor-expressing neurons controlled these behavioral changes. Our results demonstrate a causal link between synaptic plasticity and alcohol-seeking behavior and suggest that modulation of this plasticity may inspire a therapeutic strategy for addiction.

Triboelectrification-Induced Self-Assembly of Macro-Sized Polymer Beads on a Nanostructured Surface for Self-Powered Patterning.

Here we report an electrostatic-templated self-assembly (ETSA) method for arbitrarily patterning millimeter-sized polymer beads on a nanostructured surface without using an extra voltage source. A patterned electrode underneath an electrification layer generates "potential wells" of the corresponding pattern at predefined window sites, which capture and anchor the beads within the window sites by electrostatic force. Analytical calculation is combined with numerical modeling to derive the electrostatic force acting on the beads, which is in great agreement with experimentally measured values. The generated pattern is solely determined by the predefined underlying electrode, making it arbitrarily switchable by using different electrode patterns. By transferring the assembled beads into an elastomer matrix, possible applications of the ETSA in fabricating optical and flexible displays are demonstrated.

Comparative metabolism of two major compounds in Fructus Corni extracts by gut microflora from normal and chronic nephropathy rats in vitro by UPLC-Q-TOF/MS.

Herbal medicines are widely used as therapeutic products in many countries. Fructus Corni, a traditional herb medicine, has been clinically used to cure chronic nephropathy for thousands of years. It could be converted by gut microflora in vivo to shape its pharmacological profiles. Thus, metabolic profiles of major active constituents in Fructus Corni extracts by gut microflora from rats in healthy and nephropathy state were firstly investigated in vitro by ultraperformance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS) in this study. According to the features of protonated ions, five metabolites (M1, M2, M3, M5 and M6) were found and preliminarily authenticated. Intestinal bacteria were capable of converting N0 (loganin) to its aglycone M1 (loganetin). The latter was further hydrogenated to the corresponding M2 (hydrogenated loganetin) and subsequently to M3 (hydrogenated and demethylated loganetin) by demethylation; While M5 (demethylated morronisid aglycone) and M6 (dehydroxylated morronisid aglycone) were identified as the two metabolites of N4 (morronisid) through demethylation and dehydroxylation. Gut microflora from healthy and nephropathy rats could degrade loganin and morronisid to the above metabolites. However, healthy rat intestinal bacteria showed more powerful degradation and much more amounts of M1 and M6 were obtained in their samples. Additionally, this work demonstrated that UPLC-Q-TOF/MS approach connected with MetaboLynx™ analysis software was rapid and reliable for screening and authentication of natural product metabolites.

Investigation of elite clinical post-graduation medical education / 基础医学与临床

The clinical medical post-doctoral project is an elite post-graduation national project supported by Min-istry of Human Resources and Social Security and Health and Family Planning Commission .It is a new investiga-tion for elite medical education in new era.During the first academic year of launching this project in Peking Union Medical College Hospital ( PUMCH) , the department of internal medicine has continuously modified and developed the implementation of this project, including the setting of courses, teaching process, evaluation and feedback, basing on the feedback collecting from multiple dimensions during the process .These actions have boosted this project to be outstanding on the basis of the regular training program of residents , which has been es-tablished in the internal medicine department of PUMCH , and made it as an elite post-graduation medical educa-tion project.The process and experience of this project could provide reference for the implementation of similar projects in other teaching hospitals .

Comparative pharmacokinetics of six major bioactive components in normal and type 2 diabetic rats after oral administration of Sanhuang Xiexin Decoction extracts by UPLC-TQ MS/MS.

A rapid, sensitive, and selective UPLC-TQ-MS/MS method was established and validated for the determination and pharmacokinetic investigation of rhein, coptisine, berberine, palmatine, baicalin and wogonoside from Sanhuang Xiexin Decoction (SXD) extracts. A Waters BEH C18 UPLC column was used with the mobile phases of Acetonitrile-0.1% formic acid-water. The lower limits of quantification (LLOQ) for rhein, coptisine, berberine, palmatine, baicalin and wogonoside were 24.16, 0.72, 0.68, 0.53, 18.07 and 28.56ng/mL, respectively. All calibration curves displayed good linearity (r2>0.995). The precision was evaluated by intra-day and inter-day assays and the RSD% were all within 9.12%, and the bias of the accuracies ranged from -7.50% to 8.03%. The recovery ranged from 74.83% to 94.32% and the matrix effects of six analytes were found to be between 90.17% and 103.10%. The stability study showed that compounds were stable during the experiment. Finally, the data showed that the pharmacokinetic (PK) profiles (especially AUC, Tmax and Cmax) of six analytes in diabetic rats were significantly diverse from that in normal group rats. The PK study under the pathological condition could provide more helpful information to guide the clinical usage of SXD to treat T2DM.

Competency based progressive evaluation and feedback system in internal medicine standard resident training in Peking Union Medical College Hospital / 基础医学与临床

Objective To establish a new competency based evaluation and feedback system, which can evaluate real-time how the residents perform and get feedbacks for improvement .Methods Based on the situation and re-quirements of standard resident training in China , and learn from experiences of other countries, we designed a new progressive evaluation and feedback system, and use the system to evaluation 6 clinic post-doctors in internal medicine department who graduate in 2016.Results This evaluation and feedback system not only reflect a total score of each resident evaluated, but also show advantages and weakness in each competency.Conclusions To implement this progressive evaluation and feedback system into the process of standard resident training can provide a feasible way to formatively and progressively evaluation residents and help them to improve , which is of critical importance.

Clinical study of DSA combined with dual-chamber Fogarty catheter in venous crisis / 天津医药

Objective To observe the clinical effect of digital subtraction angiography (DSA) combined with double-chamber Fogarty catheter in venous crisis after replantation of severed extremities. Methods A total of 12 cases with venous crisis after replantation of severed extremities treated by DSA combined with double-chamber Fogarty catheter from June 2011 to January 2016 were included in this study. Results Eleven cases survived after operation. Healing status of surgical incisions was stageⅠfor all patients. Of which osteofascial compartment syndrome was found in 1 case, and it was cured by surgical incision treatment; liver damage was found in another case, and acute liver damage was treated by comprehensive treatment of internal medicine. The postoperative venous thrombosis was found again in one case. The patient underwent exploratory surgery, and venous thrombosis was found again, limb partial necrosis was found, amputation was perform, and the incision was healed in Ⅰ stage. Complications including vascular rupture, air embolism, infection and sepsis were not found in all patients. Thrombosis was presented in the vein, the length of 0.6-4.2 cm. A total of 11 patients were treated with Fogarty catheters and followed up for 11 months (7 months to 29 months). The limb shape of the patient was satisfactory, blood supply of limb was improved, and capillary filling time was 1.5-3.3 s, swelling degree was improved, skin temperature was normal or lower than the limb 0.6-1.5℃, the skin color was normal, the activity improved, the feeling of recovery S0-S4 levels, the average in the S3 + level, two-point discrimination was 3-8 mm with an average of 4.5 mm. According to the evaluation criteria of the replantation function of the limb replantation of the Chinese Medical Association, 5 cases were excellent, 4 cases were good and 2 cases were poor. Conclusion The application of DSA combined with double-chamber Fogarty balloon catheter for the treatment of venous crisis shows precise localization of thrombosis, increased targeting venous branch in blood vessels, minimally invasion, quick, and satisfactory clinical results.

Clinical study of DSA combined with dual-chamber Fogarty catheter in venous crisis / 天津医药

Objective To observe the clinical effect of digital subtraction angiography (DSA) combined with double-chamber Fogarty catheter in venous crisis after replantation of severed extremities. Methods A total of 12 cases with venous crisis after replantation of severed extremities treated by DSA combined with double-chamber Fogarty catheter from June 2011 to January 2016 were included in this study. Results Eleven cases survived after operation. Healing status of surgical incisions was stageⅠfor all patients. Of which osteofascial compartment syndrome was found in 1 case, and it was cured by surgical incision treatment; liver damage was found in another case, and acute liver damage was treated by comprehensive treatment of internal medicine. The postoperative venous thrombosis was found again in one case. The patient underwent exploratory surgery, and venous thrombosis was found again, limb partial necrosis was found, amputation was perform, and the incision was healed in Ⅰ stage. Complications including vascular rupture, air embolism, infection and sepsis were not found in all patients. Thrombosis was presented in the vein, the length of 0.6-4.2 cm. A total of 11 patients were treated with Fogarty catheters and followed up for 11 months (7 months to 29 months). The limb shape of the patient was satisfactory, blood supply of limb was improved, and capillary filling time was 1.5-3.3 s, swelling degree was improved, skin temperature was normal or lower than the limb 0.6-1.5℃, the skin color was normal, the activity improved, the feeling of recovery S0-S4 levels, the average in the S3 + level, two-point discrimination was 3-8 mm with an average of 4.5 mm. According to the evaluation criteria of the replantation function of the limb replantation of the Chinese Medical Association, 5 cases were excellent, 4 cases were good and 2 cases were poor. Conclusion The application of DSA combined with double-chamber Fogarty balloon catheter for the treatment of venous crisis shows precise localization of thrombosis, increased targeting venous branch in blood vessels, minimally invasion, quick, and satisfactory clinical results.

Dynamic Triboelectrification-Induced Electroluminescence and its Use in Visualized Sensing.

Triboelectrification-induced electroluminescence converts dynamic motion into light emission. Tribocharges resulting from the relative mechanical interactions between two dissimilar materials can abruptly and significantly alter the surrounding electric potential, exciting the electroluminescence of phosphor along the motion trajectory. The position, trajectory, and contour profile of a moving object can be visualized in high resolution, demonstrating applications in sensing.

Interface-Free Area-Scalable Self-Powered Electroluminescent System Driven by Triboelectric Generator.

Self-powered system that is interface-free is greatly desired for area-scalable application. Here we report a self-powered electroluminescent system that consists of a triboelectric generator (TEG) and a thin-film electroluminescent (TFEL) lamp. The TEG provides high-voltage alternating electric output, which fits in well with the needs of the TFEL lamp. Induced charges pumped onto the lamp by the TEG generate an electric field that is sufficient to excite luminescence without an electrical interface circuit. Through rational serial connection of multiple TFEL lamps, effective and area-scalable luminescence is realized. It is demonstrated that multiple types of TEGs are applicable to the self-powered system, indicating that the system can make use of diverse mechanical sources and thus has potentially broad applications in illumination, display, entertainment, indication, surveillance and many others.

Synthesis, crystal structure and fluorescence properties of terbium complexes with phenoxyacetic acid and 2,4,6-tris-(2-pyridyl)-s-triazine.

Two complexes of Tb(3+), Gd(3+) /Tb(3+) and one heteronuclear crystal Gd(3+)/Tb(3+) with phenoxyacetic acid (HPOA) and 2,4,6-tris-(2-pyridyl)-s-triazine (TPTZ) have been synthesized. Elemental analysis, rare earth coordination titration, inductively coupled plasma atomic emission spectrometry (ICP-AES) and thermogravimetric analysis-differential scanning calorimetry (TG-DSC) analysis show that the two complexes are Tb2 (POA)6 (TPTZ)2 · 6H2O and TbGd(POA)6 (TPTZ)2 · 6H2O, respectively. The crystal structure of TbGd(POA)6 (TPTZ)2 · 2CH3OH was determined using single-crystal X-ray diffraction. The monocrystal belongs to the triclinic system with the P-1 space group. In particular, each metal ion is coordinately bonded to three nitrogen atoms of one TPTZ and seven oxygen atoms of three phenoxyacetic ions. Furthermore, there exist two coordinate forms between C6H5OCH2COO(-) and the metal ions in the crystal. One is a chelating bidentate, the other is chelating and bridge coordinating. Fluorescence determination shows that the two complexes possess strong fluorescence emissions. Furthermore, the fluorescence intensity of the Gd(3+)/Tb(3+) complex is much stronger than that of the undoped complex, which may result from a decrease in the concentration quench of Tb(3+) ions, and intramolecular energy transfer from the ligands coordinated with Gd(3+) ions to Tb(3+) ions.

Curcumin analogue A501 induces G2/M arrest and apoptosis in non-small cell lung cancer cells.

Curcumin and its analogues have been reported to exert anti-cancer activity against a variety of tumors. Here, we reported A501, a new curcumin analogue. The effect of A501 on cell viability was detected by MTT assay, the result showed that A501 had a better inhibiting effect on the four non-small cell lung cancer (NSCLC) cells than that of curcumin. Moreover, Colony forming experiment showed A501 significant restrained cell proliferation. Flow cytometry displayed A501 can cause G2/M arrest and induce apoptosis. Western blotting showed that A501 decreased the expression of cyclinB1, cdc-2, bcl-2, while increased the expression of p53, cleaved caspase-3 and bax. In conclusion, curcumin analogues A501 played antitumor activity by inhibiting cell proliferation and inducing apoptosis of NSCLC cells. And it was likely to be a promising starting point for the development of curcumin-based anticancer drugs.

Systemic injection of low-dose lipopolysaccharide fails to break down the blood-brain barrier or activate the TLR4-MyD88 pathway in neonatal rat brain.

We aimed to investigate whether peripheral low-dose lipopolysaccharide (LPS) induces the breakdown of the blood-brain barrier (BBB) and/or the activation of toll-like receptor 4 (TLR4) in the neonatal rat brain. Neonatal rats received intraperitoneal injections of low-dose LPS (0.3 mg/kg∙bw), and the BBB compromise was detected by Evans Blue extravasation and electron microscopy. Meanwhile, TLR4, adaptin myeloid differentiation factor 88 (MyD88), nuclear transcription factor kappa-B (NF-κB) p50 and tumor necrosis factor alpha (TNFα) in the neonatal rat brain were determined by quantitative real-time polymerase chain reaction (PCR) and Western Blot. Immunohistochemistry was used to determine the distribution and activation of microglia in the brain after LPS administration. It was demonstrated that Evans Blue extravasation was not observed in the brain parenchyma, and that tight junctions of cerebral endothelial cells remained intact after systemic injections of LPS in neonatal rats. Although intracerebroventricular injections of LPS activated microglia and up-regulated the expression of TLR4, MyD88, NF-κB p50 and TNFα in the neonatal rat brain, systemic LPS did not induce these responses. These findings indicate that while the neonatal rat brain responds to the direct intra-cerebral administration of LPS through robust TLR4 activation, systemic low-dose LPS does not induce the innate immune reaction or compromise the BBB in neonatal rats.