[Analysis of animal models of ulcerative colitis based on characteristics of clinical symptoms of traditional Chinese and Wes-tern medicine].

This article aims to provide a good experimental method for the study of drug treatment of ulcerative colitis. According to the characteristics of ulcerative colitis's clinical symptoms, common ulcerative colitis animal models were analyzed. Based on the characteristics of clinical symptoms of traditional Chinese medicine and Western medicine for ulcerative colitis disease, the existing commonly used animal models of ulcerative colitis were analyzed to summarize the current matching degree, advantages and disadvantages of the exi-sting animal models of ulcerative colitis and clinical symptoms. At present, studies on ulcerative colitis mainly adopt four types of induction modeling methods, such as immunization, chemical stimulation, compound method and gene model. There are many reported methods of colitis modeling, but no model can reflect the characteristics of clinical symptoms of ulcerative colitis treated with Western or Chinese medicine. This article summarizes the characteristics, clinically relevant symptoms and applicable scope of immunization, chemical stimulation, compound method, and gene model, so as to provide a reliable animal model for subsequent studies of prevention and treatment of colitis.

Juvenile hormone prevents 20-hydroxyecdysone-induced metamorphosis by regulating the phosphorylation of a newly identified broad protein.

The steroid hormone 20-hydroxyecdysone (20E) initiates insect molting and metamorphosis. By contrast, juvenile hormone (JH) prevents metamorphosis. However, the mechanism by which JH inhibits metamorphosis remains unclear. In this study, we propose that JH induces the phosphorylation of Broad isoform Z7 (BrZ7), a newly identified protein, to inhibit 20E-mediated metamorphosis in the lepidopteran insect Helicoverpa armigera. The knockdown of BrZ7 in larvae inhibited metamorphosis by repressing the expression of the 20E response gene. BrZ7 was weakly expressed and phosphorylated during larval growth but highly expressed and non-phosphorylated during metamorphosis. JH regulated the rapid phosphorylation of BrZ7 via a G-protein-coupled receptor-, phospholipase C-, and protein kinase C-triggered pathway. The phosphorylated BrZ7 bound to the 5'-regulatory region of calponin to regulate its expression in the JH pathway. Exogenous JH induced BrZ7 phosphorylation to prevent metamorphosis by suppressing 20E-related gene transcription. JH promoted non-phosphorylated calponin interacting with ultraspiracle protein to activate the JH pathway and antagonize the 20E pathway. This study reveals one of the possible mechanisms by which JH counteracts 20E-regulated metamorphosis by inducing the phosphorylation of BrZ7.

Rice protein exerts a hypocholesterolemic effect through regulating cholesterol metabolism-related gene expression and enzyme activity in adult rats fed a cholesterol-enriched diet.

The major aim of this study is to elucidate the hypocholesterolemic mechanism exerted by rice protein (RP) in adult rats under cholesterol-enriched dietary condition. Compared with casein, the cholesterol levels in plasma and the liver were significantly reduced by RP, accompanying significant inhibition of cholesterol absorption. RP increased the activity and mRNA level of cholesterol 7α-hydroxylase, whereas acyl-CoA:cholesterol acyltransferase activity and gene expression were significantly depressed with consumption of RP. Neither the activity nor gene expression of 3-hydroxy-3-methylglutaryl coenzyme A reductase of RP differed from that of casein. The gene expression of the peroxisome proliferator-activated receptor α and liver X receptor α were significantly activated by consumption of RP. RP did not modify the mRNA level of sterol regulatory element-binding protein-2 with respect to casein. These results suggest RP can induce a cholesterol-lowering effect through modifying cholesterol metabolism-related gene expression and enzyme activity in adult rats.

Mod(mdg4) participates in hormonally regulated midgut programmed cell death during metamorphosis.

The insect midgut undergoes programmed cell death (PCD) during metamorphosis, but the molecular basis for this phenomenon has not been demonstrated. We report a mod(mdg4) protein [designated as mod(mdg4)1A] that is involved in hormonally regulated insect midgut PCD, from the lepidopteran Helicoverpa armigera. Mod(mdg4)1A is localized in the larval midgut and is highly expressed during metamorphosis. Knockdown of mod(mdg4)1a by feeding dsRNA to the larvae suppressed midgut PCD and delayed metamorphosis. The mechanism is that mod(mdg4)1a knockdown decreased the transcript levels of genes involved in PCD and metamorphosis, but increased the transcript level of inhibitor of apoptosis survivin. The transcript level of mod(mdg4)1a is independently upregulated by 20-hydroxyecdysone (20E) or juvenile hormone (JH) analog methoprene. Overlapped 20E and methoprene counteractively regulate the transcript level of mod(mdg4)1a. 20E upregulates the mod(mdg4)1a transcript level not through its nuclear receptor EcRB1. Methoprene upregulates the mod(mdg4)1a transcript level through the juvenile hormone candidate receptor Met. These findings indicate that mod(mdg4)1a participates in midgut PCD and metamorphosis by regulating the transcript levels of a network of genes via different pathways under 20E and JH regulation.

The apoptosis inhibitor survivin prevents insect midgut from cell death during postembryonic development.

The programmed cell death (PCD) is important in maintaining the cell number homoeostasis of tissues and organs in metazoan. This process is regulated by the inhibitors of apoptosis proteins (IAPs). The function and mechanism of IAPs have been well studied in animal embryonic development and human cancers. However, the roles and hormonal regulation of IAPs in the postembryonic development are not well understood. We report that an IAP survivin (Ha-survivin) played roles in the postembryonic development of the midgut in a lepidopteran insect Helicoverpa armigera. Ha-survivin was transcribed not only in the embryo, but also in the haemocytes, fat body and midgut during larval molting or pupal adulting. The transcription of Ha-survivin was upregulated by the steroid hormone 20-hydroxyecdysone (20E). Ha-survivin was located in the embryonic cells around the periplasm of the eggs during embryonic development. It was also located in the epithelium cells of the midgut in the fifth molting larvae and later pupae. Knockdown of Ha-survivin by RNAi in the epidermal cell line caused cell apoptosis. These results indicated that Ha-survivin played roles not only in the embryonic development, but also in the postembryonic tissue development by preventing cell death.

Food Allergy-Induced Autism-Like Behavior is Associated with Gut Microbiota and Brain mTOR Signaling.

Purpose: Food allergy-induced autism-like behavior has been increasing for decades, but the causal drivers of this association are unclear. We sought to test the association of gut microbiota and mammalian/mechanistic target of rapamycin (mTOR) signaling with cow's milk allergy (CMA)-induced autism pathogenesis. Methods: Mice were sensitized intragastrically with whey protein containing cholera toxin before sensitization on intraperitoneal injection with whey-containing alum, followed by intragastric allergen challenge to induce experimental CMA. The food allergic immune responses, ASD-like behavioral tests and changes in the mTOR signaling pathway and gut microbial community structure were performed. Results: CMA mice showed autism-like behavioral abnormalities and several distinct biomarkers. These include increased levels of 5-hydroxymethylcytosine (5-hmC) in the hypothalamus; c-Fos were predominantly located in the region of the lateral orbital prefrontal cortex (PFC), but not ventral; decreased serotonin 1A in amygdala and PFC. CMA mice exhibited a specific microbiota signature characterized by coordinate changes in the abundance of taxa of several bacterial genera, including the Lactobacillus. Interestingly, the changes were accompanied by promoted mTOR signaling in the brain of CMA mice. Conclusion: We found that disease-associated microbiota and mTOR activation may thus play a pathogenic role in the intestinal, immunological, and psychiatric Autism Spectrum Disorder (ASD)-like symptoms seen in CAM associated autism. However, this is only a preliminary study, and their mechanisms require further investigation.

Using a System Pharmacology Method to Search for the Potential Targets and Pathways of Yinqiaosan against COVID-19.

The first reported case of coronavirus disease 2019 (COVID-19) occurred in Wuhan, Hubei, China. Thereafter, it spread through China and worldwide in only a few months, reaching a pandemic level. It can cause severe respiratory illnesses such as pneumonia and lung failure. Since the onset of the disease, the rapid response and intervention of traditional Chinese medicine (TCM) have played a significant role in the effective control of the epidemic. Yinqiaosan (YQS) was used to treat COVID-19 pneumonia, with good curative effects. However, a systematic overview of its active compounds and the therapeutic mechanisms underlying its action has yet to be performed. The purpose of the current study is to explore the compounds and mechanism of YQS in treating COVID-19 pneumonia using system pharmacology. A system pharmacology method involving drug-likeness assessment, oral bioavailability forecasting, virtual docking, and network analysis was applied to estimate the active compounds, hub targets, and key pathways of YQS in the treatment of COVID-19 pneumonia. With this method, 117 active compounds were successfully identified in YQS, and 77 potential targets were obtained from the targets of 95 compounds and COVID-19 pneumonia. The results show that YQS may act in treating COVID-19 pneumonia and its complications (atherosclerosis and nephropathy) through Kaposi sarcoma-related herpesvirus infection and the AGE-RAGE signaling pathway in diabetic complications and pathways in cancer. We distinguished the hub molecular targets within pathways such as TNF, GAPDH, MAPK3, MAPK1, EGFR, CASP3, MAPK8, mTOR, IL-2, and MAPK14. Five of the more highly active compounds (acacetin, kaempferol, luteolin, naringenin, and quercetin) have anti-inflammatory and antioxidative properties. In summary, by introducing a systematic network pharmacology method, our research perfectly forecasts the active compounds, potential targets, and key pathways of YQS applied to COVID-19 and helps to comprehensively clarify its mechanism of action.

Mechanistic Studies of Gypenosides in Microglial State Transition and its Implications in Depression-Like Behaviors: Role of TLR4/MyD88/NF-κB Signaling.

Depression is a prevalent psychiatric disorder. Microglial state transition has been found in many neurological disorders including depression. Gypenosides (Gypenosides I-LXXVIII, Gps) are saponin extracts isolated from the traditional Chinese herb Gynostemma pentaphyllum (Thunb.) Makino that exert anti-inflammatory and neuroprotective activities and regulate depression-like behaviors. However, its effect on microglial state transition in depression remains unknown. We aimed to evaluate the potential relationship between Gps and TLR4/MyD88/NF-κB signaling in microglial state transition in vitro and in vivo. First, BV-2 cells (microglial cell line) were exposed to lipopolysaccharides (LPS) and treated with 10 or 5 µg/ml Gps. Second, the chronic unpredictable mild stress (CUMS)-induced depression mouse model was used to investigate the antidepressant-like behaviors effects of Gps (100 or 50 mg/kg). We determined depression-like behaviors using the open-field test (OFT), forced swim test (FST), and sucrose preference test (SPT). Proteins and inflammatory factors in the TLR4/MyD88/NF-κB signaling pathway and the different microglial reaction states markers were subsequently conducted using enzyme-linked immunosorbent assay, immunocytochemistry, immunofluorescence, qPCR, or Western blotting analyses to evaluate the anti-inflammatory and antidepressant properties of Gps and the underlying molecular mechanisms. We found that Gps regulated the microglial cell line state transition in LPS-exposed BV-2 cells, as evidenced by the significantly decreased expression of inflammatory parameters iNOS, IL-1ß, IL-6, and TNF-α and significantly promoted anti-inflammatory microglial phenotypes markers CD206 (Mrc1) and IL-10. More importantly, Gps protected against the loss of monoamine neurotransmitters and depression-like behavior in a mouse model of depression, which was accompanied by a regulation of the microglial state transition. Mechanistically, Gps inhibited TLR4/MyD88/NF-κB signaling, which reduced the release of downstream inflammatory cytokines (IL-1ß, IL-6, and TNF-α) and promoted microglial phenotype transition, which all together contributed to the antidepressant effect. Our results suggest that Gps prevents depression-like behaviors by regulating the microglial state transition and inhibiting the TLR4/MyD88/NF-κB signaling pathway. Thus, Gps could be a promising therapeutic strategy to prevent and treat depression-like behaviors and other psychiatric disorders.

Function of nuclear transport factor 2 and Ran in the 20E signal transduction pathway in the cotton bollworm, Helicoverpa armigera.

BACKGROUND: Nuclear transport factor 2 and small GTPase Ran participate in the nucleo-cytoplasm transport of macromolecules, but their function in the 20-hydroxyecdysone (20E) signal transduction pathway are not well known. RESULTS: A 703 bp encoding Ntf2 and a 1233 bp encoding Ran full-length cDNAs were cloned from Helicoverpa armigera, and named Ha-Ntf2 and Ha-Ran, respectively. Northern blot and immunoblotting revealed that Ha-Ntf2 had an obviously higher expression levels in the head-thorax and integument of the metamorphically committed larvae. In contrast, the expression of Ha-Ran did not show obvious variation at various developmental stages in four tissues by immunoblotting analysis, except in the midgut, which showed increased expression from 5th-36 h (molting) to 6th-48 h. Both expressions of Ha-Ntf2 and Ha-Ran could be upregulated by 20E in vitro. Immunohistochemistry revealed that Ha-Ntf2 and Ha-Ran were primarily localized in the nucleus of various tissues. Protein binding assay and co-immunoprecipitation indicated that Ha-Ntf2 and Ha-Ran can combine with each other in vitro and in vivo. Knock down of Ha-Ntf2 or Ha-Ran by RNAi resulted in the suppression of other 20E regulated genes including EcR-B1, USP1, E75B, BR-CZ2, HHR3 and Ha-eIF5c. In addition, the knockdown of Ha-Ntf2 resulted in Ha-Ran being prevented in the cytoplasm. The nuclear location of the ecdysone receptor b1 (EcR-B1) was also blocked after the knockdown of Ha-Ntf2 and Ha-Ran. CONCLUSION: These evidences suggested that Ha-Ntf2 and Ha-Ran participated in the 20E signal transduction pathway by regulating the location of EcR-B1.

Immune responses of Helicoverpa armigera to different kinds of pathogens.

BACKGROUND: Insects react against pathogens through innate immunity. The cotton bollworm Helicoverpa armigera (H. armigera) is an important defoliator and an extremely destructive pest insect of many crops. The elucidation of the mechanism of the immune response of H. armigera to various pathogens can provide a theoretical basis for new approaches to biologically control this pest. RESULTS: Four kinds of pathogens Bacillus thuringiensis, Klebsiella pneumoniae, Candida albicans, and Autographa californica multiple nucleocapsid nucleopolyhedrovirus harbored green fluorescence protein and polyhedron (AcMNPV-GFP) were used to challenge the insect. The cellular and humoral immune responses to the pathogens were analyzed in the challenged H. armigera. The results show that in the five kinds of haemocytes, only granulocytes phagocytized the Gram-negative and Gram-positive bacteria and fungi. All haemocytes can be infected by AcMNPV. Fourteen immune-related genes including pattern recognition receptors (PRRs) such as peptidoglycan recognition proteins (HaPGRP and HaPGRP C) and Gram-Negative Bacteria-Binding Protein (HaGNBP), and antimicrobial peptides (AMPs) such as cecropin-1, 2 and 3 (HaCec-1, 2 and 3), lysozyme (HaLys), attacin (HaAtt), gallerimycin-like (HaGall), gloverin-like (HaGlo), moricin-like (HaMor), cobatoxin-like (HaCob), galiomicin-like (HaGali), and immune inducible protein (HaIip) appeared in different expression profiles to different pathogen infections. The transcripts of 13 immune related genes (except HaPGRPC) are obviously up-regulated by Gram-positive bacteria. HaCec-1 and 3, HaMor, HaAtt, HaLys, HaIip, HaPGRP and HaGNBP are greatly up-regulated after fungal infection. HaGNBP, HaCec-2, HaGall, HaGlo, HaMor, HaCob, HaGali obviously increased in Gram-negative bacterial infection. Only five genes, HaGNBP, HaCec-1, HaGali, HaGlo, and HaLys, are weakly up-regulated after viral infection. The AMP transcripts had higher expression levels than the PRR transcripts after the microbial challenge. CONCLUSIONS: These data suggest that the granulocytes are the major phagocytes in H. armigera. All haemocytes can be infected by AcMNPV. The transcripts of 14 immune related genes have different expression patterns in H. armigera infected by different pathogens, which means that the immune-related genes may have different functions against various kinds of pathogens.

Identification of genes differentially expressed during larval molting and metamorphosis of Helicoverpa armigera.

BACKGROUND: Larval molting and metamorphosis are important physiological processes in the life cycle of the holometabolous insect. We used suppression subtractive hybridization (SSH) to identify genes differentially expressed during larval molting and metamorphosis. RESULTS: We performed SSH between tissues from a variety of developmental stages, including molting 5th and feeding 6th instar larvae, metamorphically committed and feeding 5th instar larvae, and feeding 5th instar and metamorphically committed larvae. One hundred expressed sequence tags (ESTs) were identified and included 73 putative genes with similarity to known genes, and 27 unknown ESTs. SSH results were further characterized by dot blot, Northern blot, and RT-PCR. The expression levels of eleven genes were found to change during larval molting or metamorphosis, suggesting a functional role during these processes. CONCLUSION: These results provide a new set of genes expressed specifically during larval molt or metamorphosis that are candidates for further studies into the regulatory mechanisms of those stage-specific genes during larval molt and metamorphosis.

Antioxidant capacity responsible for a hypocholesterolemia is independent of dietary cholesterol in adult rats fed rice protein.

Dietary cholesterol and aging are major risk factors to accelerate oxidation process for developing hypercholesterolemia. The major aim of this study is to elucidate the effects of rice protein on cholesterol level and oxidative stress in adult rats fed with and without cholesterol. After 2 weeks of feeding, hepatic and plasma contents of cholesterol, reduced glutathione (GSH), oxidized glutathione (GSSG), malondialdehyde (MDA) and protein carbonyl (PCO) were measured. In liver, total antioxidative capacity (T-AOC), activities of antioxidant enzymes (total superoxide dismutase, T-SOD; catalase, CAT), glutathione metabolizing enzyme activities and gene expression levels (γ-glutamylcysteine synthetase, γ-GCS; glutathione reductase, GR; glutathione peroxidase, GPx) were determined. Under cholesterol-free/enriched dietary condition, T-AOC, activities of T-SOD and CAT, glutathione metabolism related enzymes' activities and mRNA levels (γ-GCS, GR and GPx) were effectively stimulated by rice proteins as compared to caseins. Compared with caseins, rice proteins significantly increased hepatic and plasma GSH contents, whereas hepatic and plasma accumulations of MDA, PCO and GSSG were significantly reduced by rice protein-feedings. As a result, the marked reductions of cholesterol in the plasma and in the liver were observed in adult rats fed rice proteins with and without cholesterol. The present study demonstrates that the hypocholesterolemic effect of rice protein is attributable to inducing antioxidative response and depressing oxidative damage in adult rats fed cholesterol-free/enriched diets. Results suggest that the antioxidant capability involved in the hypocholesterolemic action exerted by rice protein is independent of dietary cholesterol during adult period.

DNA methylation dynamics of a maternally methylated DMR in the mouse Dlk1-Dio3 domain.

The mouse delta-like homolog 1 and type III iodothyronine deiodinase (Dlk1-Dio3) imprinted domain contains three known paternally methylated differentially methylated regions (DMRs): intergenic DMR (IG-DMR), maternally expressed 3-DMR (Gtl2-DMR), and Dlk1-DMR. Here, we report the first maternally methylated DMR, CpG island 2 (CGI-2), is located approximately 800 bp downstream of miR-1188. CGI-2 is highly methylated in sperm and oocytes, de-methylated in pre-implantation embryos, and differentially re-methylated during post-implantation development. CGI-2, similarly to Gtl2-DMR and Dlk1-DMR, acquires differential methylation prior to embryonic day 7.5 (E7.5). Both H3K4me3 and H3K9me3 histone modifications are enriched at CGI-2. Furthermore, CCCTC-binding factor (CTCF) binds to both alleles of CGI-2 in vivo. These results contribute to the investigation of imprinting regulation in this domain.

Expression analysis of AK003491, an imprinted noncoding RNA, during mouse development.

The Dlk1-Dio3 imprinted domain on mouse chromosome 12qF1 contains three paternally expressed protein-coding genes and multiple maternally expressed long or short noncoding RNA genes. All these imprinted genes are regulated by IG-DMR located between Dlk1 and Meg3/Gtl2. Recently, several novel imprinted noncoding RNAs were identified in the intergenic region of this domain, although the exact number of imprinted genes within the region is unclear. Here, we report that a novel noncoding RNA, AK003491, located between Meg3/Gtl2 and Meg8, is maternally expressed in E15.5 brain, tongue, heart, lung, liver and kidney tissues. In situ hybridization analysis at E15.5 shows AK003491 is predominantly expressed in forebrain, tongue, thymus, somites, lung and liver. Quantitative real-time RT-PCR analysis confirms this expression pattern and detects highest expression in tongue. While the AK003491 expression pattern at postnatal day 1 is similar to E15.5, AK003491 expression at postnatal day 30 is mainly restricted to the brain. These results expand the number of known imprinted long noncoding RNAs in this domain, and contribute to further investigation of their regulatory mechanism and function.

Conservation of genomic imprinting at the NDN, MAGEL2 and MEST loci in pigs.

Imprinted genes have important effects on the regulation of fetal growth, development, and postnatal behavior. However, the study of imprinted genes has been limited in mammalian species other than human and mouse. Therefore, the study of porcine imprinted genes is useful for defining the extent of conservation of genomic imprinting among different species. In this study, the imprinting status of porcine NDN, MAGEL2 and MEST genes was determined by direct sequencing of the cDNAs and detection of single nucleotide polymorphisms (SNPs) identified in individuals from reciprocal crosses between Meishan and Large White pigs for allele discrimination. The analysis was carried out in 13 different tissues (skeletal muscle, fat, pituitary gland, heart, lung, liver, kidney, spleen, stomach, small intestine, uterus, ovary and testis) from 12 two-month-old piglets. Imprinting analysis showed that NDN and MAGEL2 were paternally expressed in all tissues where the genes were expressed as in human and mouse. Interestingly, MEST showed tissue-specific imprinting, being paternally expressed in skeletal muscle, fat, pituitary gland, heart, kidney, lung, stomach and uterus, and maternally expressed in spleen and liver.

Imprinting and expression analysis of a non-coding RNA gene in the mouse Dlk1-Dio3 domain.

The Dlk1-Dio3 imprinted domain not only is implicated growth and development of the embryo and placenta, but also affects adult metabolism and brain function. In this study, we identified the imprinting status of a mouse non-coding RNA gene, B830012L14Rik, mapped to the Dlk1-Dio3 domain by the polymorphism- and sequencing-based approach. Imprinting analysis showed that the gene was expressed maternally at E15.5, E18.5 and postnatal day 1 mice. Two transcripts of approximately 1.9 and 3.5 kb were detected by northern blot. Furthermore, we examined the spatiotemporal expression patterns of the gene during the mouse development. In situ hybridization analysis showed that B830012L14Rik was mainly expressed in forebrain, pituitary, cartilage primordium of spinal column, lung and liver at E13.5 and E15.5. The results of real-time quantitative RT-PCR showed that the B830012L14Rik expression in brain, heart, lung and liver was higher at E15.5 than at E12.5 and E18.5. Furthermore, the gene expression increased progressively in brain from E12.5 to E15.5 whereas decreased from E15.5 to E19.5. This study may provide further insights into the imprinting, genomic features and expression regulation of the Dlk1-Dio3 imprinted cluster.

Molecular cloning, mRNA expression and imprinting status of PEG3, NAP1L5 and PPP1R9A genes in pig.

Imprinted genes are expressed monoallelically depending on their parental origin, and play important roles in the regulation of fetal growth, development, and postnatal behavior. Most genes known to be imprinted have been identified and studied in the human and the mouse. However, there are only a small number of reported imprinted genes in pigs. Therefore, identification and characterization of more imprinted genes in pigs is useful for comparative analysis of genomic imprinting across species. In this study, we cloned the porcine PEG3, NAP1L5 and PPP1R9A genes. The imprinting status of these genes was determined using sequencing directly and single nucleotide polymorphisms (SNPs) identified in individuals from reciprocal cross of Meishan and Large White pigs. Imprinting analysis was carried out in 13 different tissues (skeletal muscle, fat, pituitary gland, heart, lung, liver, kidney, spleen, stomach, small intestine, uterus, ovary and testis) from twelve 2-month-old piglets. Imprinting analysis showed that PEG3 and NAP1L5 were exclusively expressed from the paternal allele whereas PPP1R9A was biallelically expressed in all tissues tested where the genes were expressed. The study is of interest to understand the conservation of genomic imprinting among mammals at the 3 loci.

Identification of differentially expressed proteins during larval molting of Helicoverpa armigera.

Insect molting involves many molecular processes, such as protein degradation and protein synthesis in the epidermis. Various proteins have been implicated in these processes. The differentially expressed proteins during larval molting of Helicoverpa armigera were investigated using two-dimensional electrophoresis (2-D-PAGE) and matrix-assisted laser desorption/ionization-time-of-flight-mass spectrometry (MALTI-TOF-MS). Four larval tissues sampled during molting and feeding were examined. Seventy-seven differentially expressed proteins were identified in these tissues, including 20 proteins from the fifth-molting epidermis (fifth instar molting to sixth instar), 36 proteins from the fifth-molting hemolymph, and 21 from the fifth-molting fat bodies. No obviously different spots were identified from the fifth-molting midgut under these experimental conditions. After application of MALTI-TOF-MS and similarity analysis comparing results to a Drosophila protein database, 30 proteins were identified: 10 proteins from the fifth-molting epidermis, 11 proteins from the hemolymph, and 9 proteins from fat bodies. These proteins were separated into 5 groups according to their probable functions, such as enzymes, regulators, protein hydrolases, receptors, and proteins with unknown functions. These differentially expressed proteins were proposed to be involved in the Helicoverpa molting cascade.