Antioxidant and Anti-Obesity Effects of Juglans mandshurica in 3T3-L1 Cells and High-Fat Diet Obese Rats.

Juglans mandshurica Maxim. walnut (JMW) is well-known for the treatment of dermatosis, cancer, gastritis, diarrhea, and leukorrhea in Korea. However, the molecular mechanism underlying its anti-obesity activity remains unknown. In the current study, we aimed to determine whether JMW can influence adipogenesis in 3T3-L1 preadipocytes and high-fat diet rats and determine the antioxidant activity. The 20% ethanol extract of JMW (JMWE) had a total polyphenol content of 133.33 ± 2.60 mg GAE/g. Considering the antioxidant capacity, the ABTS and DPPH values of 200 µg/ml of JMWE were 95.69 ± 0.94 and 79.38 ± 1.55%, respectively. To assess the anti-obesity activity of JMWE, we analyzed the cell viability, fat accumulation, and adipogenesis-related factors, including CCAAT-enhancer-binding protein alpha (C/EBPα), sterol regulatory element-binding protein-1c (SREBP1c), peroxisome proliferator-activated receptor-gamma (PPARγ), fatty acid synthase (FAS), and acetyl-CoA carboxylase (ACC). We found that total lipid accumulation and triglyceride levels were reduced, and the fat accumulation rate decreased in a dose-dependent manner. Furthermore, JMWE suppressed adipogenesis-related factors C/EBPα, PPARγ, and SREBP1c, as well as FAS and ACC, both related to lipogenesis. Moreover, animal experiments revealed that JMWE could be employed to prevent and treat obesity-related diseases. Hence, JMWE could be developed as a healthy functional food and further explored as an anti-obesity drug.

In Vitro and In Vivo Anti-Inflammatory Potential of Cannabichromene Isolated from Hemp.

Cannabichromene (CBC), a non-psychoactive cannabinoid found in Cannabis sativa, has recently been shown to possess several medicinal properties. However, how CBC produces anti-inflammatory effects and the mechanisms of this remain poorly studied. Therefore, we extracted and purified the CBC from the Cannabis sativa cv. pink pepper (hemp cultivar). The efficacy of CBC in reducing inflammation in RAW 264.7 macrophages and a λ-carrageenan-induced mouse model was then evaluated. CBC had no cytotoxicity up to a concentration of 20 µM and inhibited nitric oxide production by approximately 50% at a concentration of 20 µM. In addition, CBC treatment significantly inhibited causes of inflammation such as inducible nitric oxide synthase (iNOS), interleukin-1ß (IL-1ß), IL-6, and tumor necrosis factor-α (TNF-α) at both the mRNA and protein levels. Moreover, CBC suppressed LPS-stimulated inflammation in RAW 264.7 cells by downregulating the nuclear factor kappa B (NF-kB) and mitogen-activated protein kinase pathways (MAPK). Furthermore, our in vivo experiments confirmed that the λ-carrageenan-induced increase in the levels of the cytokines iNOS, IL-1ß, and IL-6 was abrogated following treatment with CBC. Therefore, CBC has potential anti-inflammatory effects and may be useful for preventing or treating inflammation.

In Vitro and In Vivo Anti-Inflammatory Effects of Cannabidiol Isolated from Novel Hemp (Cannabis sativa L.) Cultivar Pink Pepper.

Cannabis sativa L. contains more than 80 cannabinoids, among which cannabidiol (CBD) is the main neuroactive component. We aimed to investigate the anti-inflammatory efficacy of CBD in vitro and in vivo isolated from "Pink pepper", a novel hemp cultivar, by repeating the method of selecting and cultivating individuals with the highest CBD content. We investigated the effects of CBD on inflammatory markers elevated by lipopolysaccharide (LPS) treatment in RAW 264.7 mouse macrophage cells through Western blot and RT-PCR. In addition, we confirmed these effects through the ELISA of inflamed paw tissue of a λ-carrageenan-induced mouse edema model that received an oral administration of CBD. CBD inhibited the LPS-induced phosphorylation of NF-κB and MAPK in RAW 264.7 and exhibited anti-inflammatory effects by participating in these pathways. In our in vivo study, we confirmed that CBD also inhibited the inflammatory mediators of proteins extracted from edematous mouse paw tissue. These results show that CBD isolated from "Pink pepper" exhibits potent anti-inflammatory effects. These anti-inflammatory effects of CBD have pharmacological and physiological significance, highlighting the industrial value of this novel cultivar.

Ultrasonic-Assisted Extraction of Cannabidiolic Acid from Cannabis Biomass.

Industrial hemp (Cannabis spp.) has many compounds of interest with potential medical benefits. Of these compounds, cannabinoids have come to the center of attention, specifically acidic cannabinoids. The focus is turning toward acidic cannabinoids due to their lack of psychotropic activity. Cannabis plants produce acidic cannabinoids with hemp plants producing low levels of psychotropic cannabinoids. As such, utilization of hemp for acidic cannabinoid extraction would eliminate the need for decarboxylation prior to extraction as a source for the cannabinoids. The use of solvent-based extraction is ideal for obtaining acidic cannabinoids as their solubility in solvents such as supercritical CO2 is limited due to the high pressure and temperature required to reach their solubility constants. An alternative method designed to increase solubility is ultrasonic-assisted extraction. In this protocol, the impact of solvent polarity (acetonitrile 0.46, ethanol 0.65, methanol 0.76, and water 1.00) and concentration (20%, 50%, 70%, 90%, and 100%) on ultrasonic-assisted extraction efficiency has been examined. Results show that water was the least effective and acetonitrile was the most effective solvent examined. Ethanol was further examined since it has the lowest toxicity and is generally regarded as safe (GRAS). Surprisingly, 50% ethanol in water is the most effective ethanol concentration for extracting the highest amount of cannabinoids from hemp. The increase in cannabidiolic acid concentration was 28% when compared to 100% ethanol, and 23% when compared to 100% acetonitrile. While it was determined that 50% ethanol is the most effective concentration for our application, the method has also been demonstrated to be effective with alternative solvents. Consequently, the proposed method is deemed effective and rapid for extracting acidic cannabinoids.

Antioxidant and lipid-reducing effects of Rosa rugosa root extract in 3T3-L1 cell.

Rosa rugosa root is traditionally known to be effective in the treatment of diabetes in Korea. R. rugosa root-specific compounds also show antioxidant effects, and could reduce lipid and fat accumulation, however, the underlying mechanism has not been clarified. In present study, the antioxidant and lipid-reducing effects of a 50% ethanol extract of R. rugosa (REE) were investigated differentiated mouse preadipocytes (3T3-L1 cells). REE showed strong radical scavenging activities and inhibitory effect of total lipid accumulation and triglyceride levels in differentiated 3T3-L1 cells. In addition, REE treatment reduced the mRNA and protein levels of adipogenesis and lipogenesis markers. This REE-promoted lipid reduction was caused by downregulation of peroxisome proliferator activated receptor gamma (PPARγ), CCAAT/enhancer binding protein alpha (C/EBPα), and sterol regulatory element binding protein1 (SREBP1c) and down regulation of ERK expression. Overall, these results demonstrate the potential of REE for development of a drug in the medical treatment of lipid-associated disorders.

Applications and Functions of γ-Poly-Glutamic Acid and its Derivatives in Medicine.

BACKGROUND: γ-Poly-Glutamic Acid (γ-PGA) is a naturally occurring homo-polyamide produced by various strains of Bacillus. It is made from repeating units of L-glutamic acid, D-glutamic acid, or both connected through amide linkages between α-amino and γ-carboxylic acid groups. As a biopolymer substance, the attractive properties of γ-PGA are that it is water-soluble, biodegradable, biocompatible, non-toxic, non-immunogenic, and edible. Therefore, it can be used as a green and environmentally friendly biological material. METHODS: The review concentrates on the reports revealing the functions and potential use of γ-PGA and its derivatives in medicine. RESULTS & DISCUSSION: γ-PGA is described to possess several properties that may be exploited in medicine. The biopolymer reportedly has been successfully applied not only as a metal chelator, drug carrier/ deliverer, and gene vector, but also used safely as a vaccine adjuvant, tissue engineering material, and contrast agent. CONCLUSION: γ-PGA could be potentially considered as a potential biomedical material in the field of medicine.

Antioxidant and Anti-Obesity Activities of Polygonum cuspidatum Extract through Alleviation of Lipid Accumulation on 3T3-L1 Adipocytes.

Natural products are widely used due to their various biological activities which include antiinflammatory, antioxidant, and anti-obesity effects. In this study, we determined the antioxidative and anti-obesity effects of Polygonum cuspidatum 50% ethanol extract (PEE). The antioxidative effect of PEE was evaluated using its radical scavenging activity, total phenolic content, and reducing power. The anti-obesity effect of PEE was investigated using 3T3-L1 adipocytes. The antioxidative activity of PEE was progressively increased in various concentrations, mainly due to the presence of phenolic compounds. PEE also alleviated lipid accumulation on 3T3-L1 adipocytes and downregulated the mRNA and protein production of adipogenesis-related (SREBP-1c, PPARγ, C/EBPα) and lipogenesis-related (aP2, FAS, ACC) markers. Furthermore, we found that the inhibitory effect on lipid accumulation via PEE was caused by the alleviation of NF-κB, p38 MAPK, ERK1/2, and JNK at the protein level. Taken together, our results imply that PEE is a potential antioxidant that can prevent obesityassociated disorders.

Cryptosporidium parvum: radiation-induced alteration of the oocyst proteome.

Cryptosporidium parvum is a waterborne protozoan parasite that is found intracellularly in host animals, including humans, and causes severe diarrhea, which can lead to the death of an immunocompromised individual. Previously, we found that this organism is highly radioresistant as it can productively infect mice after exposure to a 10-kGy dose of γ-radiation. To understand how C. parvum avoids radiation damage, we characterized its protein expression patterns 6, 24, and 48 h after a 10-kGy dose of γ-radiation using two-dimensional PAGE. The gels showed 10 silver-stained spots that increased or decreased in size following γ-irradiation. Five proteins contained in these spots were identified using MALDI-TOF MS peptide fingerprinting, and two of these showed an increase in expression after γ-irradiation. These proteins were identified by LC-MS/MS as proteasome subunit alpha type 4 (NTN hydrolase fold) and thioredoxin peroxidase-like protein. The roles of these two upregulated proteins as related to the radioresistance of C. parvum remain to be evaluated.

Rejoining of gamma-ray-induced DNA damage in Cryptosporidium parvum measured by the comet assay.

Cryptosporidium parvum is a well-known waterborne intracellular protozoan that causes severe diarrheal illness in immunocompromised individuals. This organism is highly resistant to harsh environmental conditions and various disinfectants, and it exhibits one of the highest known resistances to gamma irradiation. We investigated rejoining of gamma-ray-induced DNA damage in C. parvum by neutral comet assay. Oocysts were gamma irradiated at various doses (1, 5, 10, and 25kGy) and were incubated for various periods (6-96h) after exposure to 10kGy. The comet tail moment showed that the number of DNA double-strand breaks increased concomitantly with the gamma irradiation dose. When investigating rejoining after irradiation at 10kGy, double-strand breaks peaked at 6h postirradiation, and rejoining was highest at 72h postirradiation. The observed rejoining pattern suggests that repair process occurs slowly even when complex DNA double-strand breaks in C. parvum were induced by high dose irradiation, 10kGy.

Identification and characterization of a putative basic helix-loop-helix (bHLH) transcription factor interacting with calcineurin in C. elegans.

Calcineurin is a Ca(2+)/Calmodulin activated Ser/Thr phosphatase that is well conserved from yeast to human. It is composed of catalytic subunit A (CnA) and regulatory subunit B (CnB). C. elegans homolog of CnA and CnB has been annotated to tax-6 and cnb-1, respectively and in vivo function of both genes has been intensively studied. In C. elegans, calcineurin play roles in various signaling pathways such as fertility, movement, body size regulation and serotonin-mediated egg laying. In order to understand additional signaling pathway(s) in which calcineurin functions, we screened for binding proteins of TAX-6 and found a novel binding protein, HLH-11. The HLH-11, a member of basic helix-loop-helix (bHLH) proteins, is a putative counterpart of human AP4 transcription factor. Previously bHLH transcription factors have been implicated to regulate many developmental processes such as cell proliferation and differentiation, sex determination and myogenesis. However, the in vivo function of hlh-11 is largely unknown. Here, we show that hlh-11 is expressed in pharynx, intestine, nerve cords, anal depressor and vuvla muscles where calcineurin is also expressed. Mutant analyses reveal that hlh-11 may have role(s) in regulating body size and reproduction. More interestingly, genetic epistasis suggests that hlh-11 may function to regulate serotonin-mediated egg laying at the downstream of tax-6.

Comparative sensitivity of PCR primer sets for detection of Cryptosporidium parvum.

Improved methods for detection of Cryptosporidium oocysts in environmental and clinical samples are urgently needed to improve detection of cryptosporidiosis. We compared the sensitivity of 7 PCR primer sets for detection of Cryptosporidium parvum. Each target gene was amplified by PCR or nested PCR with serially diluted DNA extracted from purified C. parvum oocysts. The target genes included Cryptosporidium oocyst wall protein (COWP), small subunit ribosomal RNA (SSU rRNA), and random amplified polymorphic DNA. The detection limit of the PCR method ranged from 10(3) to 10(4) oocysts, and the nested PCR method was able to detect 10(0) to 10(2) oocysts. A second-round amplification of target genes showed that the nested primer set specific for the COWP gene proved to be the most sensitive one compared to the other primer sets tested in this study and would therefore be useful for the detection of C. parvum.

Quantitative evaluation of infectivity change of Cryptosporidium parvum after gamma irradiation.

Cryptosporidium parvum is a well-known waterborne and opportunistic intracellular protozoan parasite that causes diarrheal illness. In this study, we quantitatively investigated reduction of the infectivity of C. parvum after gamma irradiation and repair of the infectivity during incubation time after irradiation. C. parvum oocysts were subjected to gamma irradiation at various doses (1, 5, 10, and 25 kGy), and the in vitro infectivity was measured by real-time PCR every day up to 7 days after irradiation. The in vitro infectivity of C. parvum on human ileocecal adenocarcinoma cells (HCT-8) was effectively reduced (> 2 log(10)) by irradiation at 10 kGy or more. However, in the experiment to find out repair of the infectivity, recovery was not noted until day 7 post-incubation.

Ultrastructural localization of Toxocara canis larval antigen reacted with a seropositive human serum.

Excretory-secretory products of Toxocara canis larvae have been considered as a major functional antigen in immune responses against toxocariasis. We studied ultrastructural localization of T. canis second-stage larval antigen using a seropositive human serum under immunogold electron microscopy. High-density gold particles were observed in the secretory cells, excretory duct, intestinal epithelium, and cuticle of the larval worm sections. The distribution of the positive reactions in the larval worms suggests that the nature of the antigen is excretory-secretory antigen including waste metabolites and secretory enzymes.

Pulsed-UV light inactivation of Cryptosporidium parvum.

Cryptosporidium parvum is an organism that threatens public health in the water industry. It is critical to develop improved detection methods as well as disinfection methods for protecting against cryptosporidiosis, which is caused by C. parvum. In this study, we investigated the ability of pulsed-light irradiation at 200-900 nm to inactivate C. parvum. Absolute quantitative real-time PCR was performed with cDNA made from total RNA extracted from C. parvum oocysts or HCT-8 cells infected with C. parvum oocysts in vitro. C. parvum oocysts in 100-mL quartz flasks were positioned 20, 30, and 40 cm from the light source, and the duration of irradiation was either 5 or 60 s. The reductions in oocyst viability (4.9 log10) and infectivity (6 log10) were maximal when the C. parvum oocysts were irradiated 20 cm from the pulsed-light source for 60 s, for which the UV dose was 278 mJ/cm2. The minimum dose of pulsed-UV light required for effective reduction in C. parvum infectivity (2 log10) was 15 mJ/cm2, which was achieved by 5 s of irradiation at 30 cm from the light source. This study confirmed that short-duration pulsed-UV light is an effective disinfection measure for C. parvum.

CP2 gene as a useful viability marker for Cryptosporidium parvum.

The validity of the CP2 gene of Cryptosporidium parvum as a viability marker was evaluated using absolute quantitative real-time polymerase chain reaction (qPCR) assays. Total ribonucleic acid (RNA) was isolated from live and heat-killed C. parvum oocysts, and complementary deoxyribonucleic acid was synthesized and used as a template. The most accurate number of viable C. parvum oocysts was predicted when the CP2 gene was used as a target gene. The lower detection limit of the CP2 gene was ten oocysts, which was the most sensitive among examined target genes. With heat shock induction, only hsp70 messenger RNA (mRNA) was induced, and the predicted viable oocyst number was increased by heat shock for this marker. The CP2, hsp70, Cryptosporidium oocyst wall protein, and beta-tubulin mRNAs were not detected in heat-killed oocysts, but the 18S ribosomal ribonucleic acid (rRNA) showed heat stability until 48 h after heat killing. Although the 18S rRNA demonstrated the fastest response in crossing point (CP) value among the examined primer sets in qPCR, overestimation of viable oocysts was noted in the analysis with this gene. In conclusion, the CP2 gene was identified as the most sensitive, reliable, and accurate candidate of a viability marker of C. parvum by qPCR evaluation.

Molecular phylogeny of parasitic Platyhelminthes based on sequences of partial 28S rDNA D1 and mitochondrial cytochrome c oxidase subunit I.

The phylogenic relationships existing among 14 parasitic Platyhelminthes in the Republic of Korea were investigated via the use of the partial 28S ribosomal DNA (rDNA) D1 region and the partial mitochondrial cytochrome c oxidase subunit 1 (mCOI) DNA sequences. The nucleotide sequences were analyzed by length, G + C %, nucleotide differences and gaps in order to determine the analyzed phylogenic relationships. The phylogenic patterns of the 28S rDNA D1 and mCOI regions were closely related within the same class and order as analyzed by the PAUP 4.0 program, with the exception of a few species. These findings indicate that the 28S rDNA gene sequence is more highly conserved than are the mCOI gene sequences. The 28S rDNA gene may prove useful in studies of the systematics and population genetic structures of parasitic Platyhelminthes.

Time gap between oocyst shedding and antibody responses in mice infected with Cryptosporidium parvum.

We observed the time gap between oocyst shedding and antibody responses in mice (3-week-old C57BL/6J females) infected with Cryptosporidium parvum. Oocyst shedding was verified by modified acid-fast staining. The individually collected mouse sera were assessed for C. parvum IgM and IgG antibodies by enzyme-linked immunosorbent assay from 5 to 25 weeks after infection. The results showed that C. parvum oocysts were shed from day 5 to 51 post-infection (PI). The IgM antibody titers to C. parvum peaked at week 5 PI, whereas the IgG antibody titers achieved maximum levels at week 25 PI. The results revealed that IgM responses to C. parvum infection occurred during the early stage of infection and overlapped with the oocyst shedding period, whereas IgG responses occurred during the late stage and was not correlated with oocyst shedding. Hence, IgM antibody detection may prove helpful for the diagnosis of acute cryptosporidiosis, and IgG antibody detection may prove effective for the detection of past infection and endemicity.

Identification of parasite DNA in common bile duct stones by PCR and DNA sequencing.

We attempted to identify parasite DNA in the biliary stones of humans via PCR and DNA sequencing. Genomic DNA was isolated from each of 15 common bile duct (CBD) stones and 5 gallbladder (GB) stones. The patients who had the CBD stones suffered from cholangitis, and the patients with GB stones showed acute cholecystitis, respectively. The 28S and 18S rDNA genes were amplified successfully from 3 and/or 1 common bile duct stone samples, and then cloned and sequenced. The 28S and 18S rDNA sequences were highly conserved among isolates. Identity of the obtained 28S D1 rDNA with that of Clonorchis sinensis was higher than 97.6%, and identity of the 18S rDNA with that of other Ascarididae was 97.9%. Almost no intra-specific variations were detected in the 28S and 18S rDNA with the exception of a few nucleotide variations, i.e., substitution and deletion. These findings suggest that C. sinensis and Ascaris lumbricoides may be related with the biliary stone formation and development.

Cloning of the novel putative apoptosis-related gene of Spirometra erinacei (Order Pseudophyllidae).

We postulated that apolysis was processed in accordance with apoptotic changes occurring in a cestode, Spirometra erinacei (Pseudophyllidea). We cloned the novel putative apoptosis-associated gene from S. erinacei via screening of a S. erinacei cDNA library with a ced-3 gene (activator of apoptosis) probe from Caenorhabditis elegans. We identified a 261-bp cDNA sequence, which encodes for an 86-amino acid protein. The cloned gene expression was observed in the neck and gravid proglottids via Northern blotting, using cloned cDNA inserts as probes, but the clone was not expressed in any of other tissues. We suggest that this gene may be involved in the apolysis of S. erinacei during normal tissue development and differentiation in cestode parasites.

Sequence comparisons of 28S ribosomal DNA and mitochondrial cytochrome c oxidase subunit I of Metagonimus yokogawai, M. takahashii and M. miyatai.

We compared the DNA sequences of the genus Metagonimus: M. yokogawai, M. takahashii, and M. miyatai. We obtained 28S D1 ribosomal DNA (rDNA) and mitochondrial cytochrome c oxidase subunit I (mtCOI) fragments from the adult worms by PCR, that were cloned and sequenced. Phylogenetic relationships inferred from the nucleotide sequences of the 28S D1 rDNA and mtCOI gene. M. takahashii and M. yokogawai are placed in the same clade supported by DNA sequence and phylogenic tree analysis in 28S D1 rDNA and mtCOI gene region. The above findings tell us that M. takahashii is closer to M. yokogawai than to M. miyatai genetically. This phylogenetic data also support the nomination of M. miyatai as a separate species.