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Abraham N, Kolipaka T, Pandey G, Negi M, Srinivasarao DA, Srivastava S. Revolutionizing pancreatic islet organoid transplants: Improving engraftment and exploring future frontiers. Life Sci 2024; 343:122545. [PMID: 38458556 DOI: 10.1016/j.lfs.2024.122545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 02/16/2024] [Accepted: 03/04/2024] [Indexed: 03/10/2024]
Abstract
Type-1 Diabetes Mellitus (T1DM) manifests due to pancreatic beta cell destruction, causing insulin deficiency and hyperglycaemia. Current therapies are inadequate for brittle diabetics, necessitating pancreatic islet transplants, which however, introduces its own set of challenges such as paucity of donors, rigorous immunosuppression and autoimmune rejection. Organoid technology represents a significant stride in the field of regenerative medicine and bypasses donor-based approaches. Hence this article focuses on strategies enhancing the in vivo engraftment of islet organoids (IOs), namely vascularization, encapsulation, immune evasion, alternative extra-hepatic transplant sites and 3D bioprinting. Hypoxia-induced necrosis and delayed revascularization attenuate organoid viability and functional capacity, alleviated by the integration of diverse cell types e.g., human amniotic epithelial cells (hAECs) and human umbilical vein endothelial cells (HUVECs) to boost vascularization. Encapsulation with biocompatible materials and genetic modifications counters immune damage, while extra-hepatic sites avoid surgical complications and immediate blood-mediated inflammatory reactions (IBMIR). Customizable 3D bioprinting may help augment the viability and functionality of IOs. While the clinical translation of IOs faces hurdles, preliminary results show promise. This article underscores the importance of addressing challenges in IO transplantation to advance their use in treating type 1 diabetes effectively.
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Affiliation(s)
- Noella Abraham
- Pharmaceutical Innovation and Translational Research Lab (PITRL), Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
| | - Tejaswini Kolipaka
- Pharmaceutical Innovation and Translational Research Lab (PITRL), Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
| | - Giriraj Pandey
- Pharmaceutical Innovation and Translational Research Lab (PITRL), Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
| | - Mansi Negi
- Pharmaceutical Innovation and Translational Research Lab (PITRL), Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
| | - Dadi A Srinivasarao
- Pharmaceutical Innovation and Translational Research Lab (PITRL), Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India
| | - Saurabh Srivastava
- Pharmaceutical Innovation and Translational Research Lab (PITRL), Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad, India.
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Saini N, Negi M, Yadav P, Singh R. Oxidative desulfurization of fuels using alcohol-based DESs. Environ Sci Pollut Res Int 2024:10.1007/s11356-024-33093-4. [PMID: 38584233 DOI: 10.1007/s11356-024-33093-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 03/22/2024] [Indexed: 04/09/2024]
Abstract
The presence of sulfur-containing compounds in fuel oil has become a major global issue due to their release of toxic sulfur dioxide. Hydrodesulfurization is a commonly used method for removing sulfur from fuel. However, new desulfurization techniques have been developed recently as hydrodesulfurization (HDS) is ineffective in removing refractory sulfur, e.g., BT, DBT, 4-MDBT. In this study, a series of deep eutectic solvent (DES) using ChCl, salicylic acid, oxalic acid, citric acid, and adipic acid as hydrogen bond acceptors and MeOH, EtOH, BuOH, EG, DEG, and TEG as hydrogen bond donors on different mole ratios were synthesized and then investigated the efficiency of these DESs in extracting sulfur from model and diesel fuel. Densities, viscosity, refractive index, and FTIR spectra of synthesized DESs were recorded. It also included oxidative desulfurization, which is a promising approach offering high selectivity, mild reaction conditions, low cost, and high efficiency. Hydrogen peroxide was selected as the oxidant in this study due to its excellent performance, commercial availability, and high proportion of active oxygen. [Citric acid: TEG] [1:7] and [adipic acid: TEG] [1:8] were found to be the most effective, removing up to 44.07% and 42.53% sulfur from model oil during single-stage extraction at 30 °C using a solvent-to-feed ratio of 1.0 and was increased to 86.87% and 85.06% using successive extraction up to the fourth stage. On oxidation, extraction efficiencies were reported to be 98.98%, 87.79%, and 56.25% and 96.96%, 81.22%, and 44.51% for model oil containing DBT and diesel 1 and diesel 2 with DES [citric acid: TEG] [1:7] and [adipic acid: TEG] [1:8] respectively at 30 °C using a solvent-to-feed ratio of 1.0. The study found that [citric acid: TEG] [1:7] exhibits better extraction performance in the deep desulfurization of fuels at an extraction temperature of 30 °C.
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Affiliation(s)
- Nisha Saini
- CSIR-Indian Institute of Petroleum Dehradun, Dehradun, Uttarakhand, India.
| | - Mansi Negi
- Department of Chemistry, Doon University, Dehradun, Uttarakhand, India
| | - Pooja Yadav
- CSIR-Indian Institute of Petroleum Dehradun, Dehradun, Uttarakhand, India
| | - Rajkumar Singh
- CSIR-Indian Institute of Petroleum Dehradun, Dehradun, Uttarakhand, India
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Oshima K, Aoki N, Negi M, Kishi M, Kitajima K, Matsuda T. Lactation-dependent expression of an mRNA splice variant with an exon for a multiply O-glycosylated domain of mouse milk fat globule glycoprotein MFG-E8. Biochem Biophys Res Commun 1999; 254:522-8. [PMID: 9920772 DOI: 10.1006/bbrc.1998.0107] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Expression of mRNA encoding MFG-E8, a milk fat-associated glycoprotein was investigated in mouse mammary gland. Two forms of mRNA, long and short variants, were shown to be expressed in the mammary tissue by RT-PCR analysis. Sequence analyses of these two variants and an isolated MFG-E8 gene segment indicated that the long and short mRNA variants resulted from an alternative splicing of a single pre-mRNA through in-flame inclusion and skipping of one exon, which encodes a proline/threonine (Pro/Thr)-rich domain. The long variant was expressed predominantly in mammary gland and the expression level was remarkably increased at late gestation and kept high during lactation. On the contrary, the short variant was detected ubiquitously in various tissues and its expression in the mammary gland was rather decreased in a lactation dependent manner. Expression of the long variant was also detected in a mouse mammary epithelial cell line, COMMA-1D, and enhanced by incubation with lactogenic hormones. Glycosylation inhibition analyses using tunicamycin and alpha-benzyl-GalNAc were conducted with COS7 cells transfected with plasmids expressing each mRNA variant, demonstrating that a fully glycosylated product of the long mRNA variant was not only N-glycosylated but also multiply O-glycosylated, whereas a product of the short one had only N-glycan(s). These results suggest that the alternative splicing plays a critical role for the mammary-specific and lactation-dependent expression of the MFG-E8 isoform and that the multiply O-glycosylated Pro/Thr-rich domain of this isoform is functionally important for formation of milk fat globules in mammary epithelial cells.
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Affiliation(s)
- K Oshima
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan
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Aoki N, Ishii T, Ohira S, Yamaguchi Y, Negi M, Adachi T, Nakamura R, Matsuda T. Stage specific expression of milk fat globule membrane glycoproteins in mouse mammary gland: comparison of MFG-E8, butyrophilin, and CD36 with a major milk protein, beta-casein. Biochim Biophys Acta 1997; 1334:182-90. [PMID: 9101712 DOI: 10.1016/s0304-4165(96)00091-8] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The expression of mouse milk fat globule membrane (MFGM) glycoproteins, MFG-E8, butyrophilin, CD36 was analyzed by Northern blot analyses. MFG-E8 and butyrophilin mRNAs were specifically detected in the mammary gland of lactating mice, whereas CD36 mRNA was detected in the heart and lung as well as in the mammary gland of lactating mice. The mRNAs of the three MFGM glycoproteins accumulated at mid-lactation were about 2-10-times as much as those of the early and late gestation stages, whereas beta-casein mRNA accumulation was dramatically increased; the mRNA at mid-lactation was no less than 40-times as much as that before lactation. In mouse mammary epithelial cell lines, HC11 and COMMA-1D, only a slight or almost no enhancement for the expression of MFG-E8, butyrophilin and CD36 mRNAs was induced simply by the treatment with the lactogenic hormones such as prolactin, insulin and dexamethasone, whereas the beta-casein mRNA expression was remarkably enhanced only by that treatment. Furthermore, while the beta-casein protein was constantly detected in milk throughout the lactation stage, the content of MFG-E8 and butyrophilin proteins increased during the lactation with an increase in the milk fat content. These results suggest that the stage-specific expression of milk fat globule membrane glycoproteins in mammary epithelial cells is regulated in a similar but not necessarily identical mechanism to that of a major milk protein, beta-casein.
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Affiliation(s)
- N Aoki
- Department of Applied Biological Sciences, School of Agricultural Sciences, Nagoya University, Chikusa-ku, Japan
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Moribe T, Hayashi N, Kanazawa Y, Mita E, Fusamoto H, Negi M, Kaneshige T, Igimi H, Kamada T, Uchida K. Hepatitis C viral complexity detected by single-strand conformation polymorphism and response to interferon therapy. Gastroenterology 1995; 108:789-95. [PMID: 7533113 DOI: 10.1016/0016-5085(95)90452-2] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
BACKGROUND/AIMS Hepatitis C virus (HCV) genome heterogeneity by sequence analysis in association with interferon (IFN) inefficacy has been reported. This study was performed to establish a convenient method for detecting the HCV quasispecies complexity and to determine the correlation between the complexity and the responsiveness to IFN therapy in patients with chronic hepatitis C. METHODS The quasispecies complexity of HCV hypervariable region 1 in patients treated with IFN-alpha was analyzed by polymerase chain reaction-mediated single-strand conformation polymorphism (SSCP). RESULTS Seven of 25 patients (28%) with low complexity (SSCP band number of < or = 2) were HCV RNA negative after treatment, whereas in 24 patients with high complexity (SSCP band number of > or = 3), the response to IFN was almost insignificant because only 1 patient (4.5%) remained HCV RNA negative after treatment (P < 0.05). Among type 1b patients, IFN therapy was only effective for patients with low amounts of HCV RNA (< or = 10(7.5) copies/mL serum) and low complexity. In contrast, most type 2a patients tended to respond to the therapy with exceptions being those with high amounts of HCV RNA and high complexity. CONCLUSIONS The complexity of the hypervariable region 1 quasispecies may be a factor for predicting IFN inefficacy in patients with chronic hepatitis C.
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Affiliation(s)
- T Moribe
- Diagnostic Science Department, Shionogi Biomedical Laboratories, Shionogi & Co., Ltd., Osaka, Japan
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Abstract
The effects of enhancement of enzymatic activity by heating at 56 degrees C or by limited treatment with dimethylsulfoxide, trypsin and cathepsin D on two forms (Mr = 50 kDa and 72 kDa) of human epidermal transglutaminase were studied by immunoblots using rabbit antihuman epidermal transglutaminase. Both 50 kDa and 72 kDa transglutaminase bands were detected without any alteration in the mobility of the transglutaminase bands during activation induced by heating at 56 degrees C or by pretreatment with dimethylsulfoxide. With a preincubation period longer than 60 min, the trypsin pretreated sample showed progressive disappearance of the 72 kDa transglutaminase band in conjunction with the loss of transglutaminase activity. On the other hand, samples preincubated with cathepsin D showed a complete disappearance of the 50 kDa band after 180 min. These studies suggest the different forms of human epidermal transglutaminase may regulate enzyme activity each other during normal epidermal differentiation.
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Affiliation(s)
- M Negi
- Department of Dermatology, Juntendo University, School of Medicine, Tokyo, Japan
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Abstract
Extracellular polysaccharides synthesized by Azospirillum brasilense and A. lipoferum were shown on agar plates and liquid flocculating cultures. The six strains used in this work expressed a mucoid phenotype, yielding positive calcofluor fluorescence under UV light. The calcofluor-binding polysaccharides were distributed between the capsular and exopolysaccharide fractions, suggesting exocellular localization. No calcofluor fluorescence was observed in residual cells after separation of the capsular and exopolysaccharide fractions. Cellulose content was significantly higher in flocculating than in nonflocculating cultures. Failure to induce flocculation by addition of cellulose (100 mg/ml) to nonflocculating cultures, together with the sensitivity of flocs to cellulase digestion, suggested that cellulose is involved in maintenance of floc stability. Different A. brasilense and A. lipoferum strains bound to a wheat lectin (fluorescein isothiocyanate-wheat germ agglutinin), indicating the occurrence of specific sugar-bearing receptors for wheat germ agglutinin on the cell surface. The biochemical specificity of the reaction was shown by hapten inhibition with N-acetyl-D-glucosamine. All six strains failed to recognize fluorescein isothiocyanate-soybean seed lectin under our experimental conditions. We conclude that azospirilla produce exocellular polysaccharides with calcofluor- and lectin-binding properties.
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Affiliation(s)
- M Del Gallo
- Department of Biochemistry and Microbiology, New Jersey Agricultural Experiment Station, Rutgers University, New Brunswick 08903
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Abstract
A murine monoclonal antibody (ECS-1) was prepared from BALB/c mice immunized with trypsinized cultured human foreskin keratinocytes. The antibody showed a pattern suggestive of intercellular staining on the nucleated layers of normal human epidermis, adult palm, mouse lip epidermis, and cultured human keratinocytes. ECS-1 stained human fetal skin by 9 weeks estimated gestational age. ECS-1 reacted with a 35 kD protein extracted from neonatal foreskin epidermis and cultured human keratinocytes. The protein required Nonidet P-40 or sodium dodecyl sulfate and mercaptoethanol for solubilization. ECS-1 induced epidermal cell detachment which was enhanced by complement. ECS-1 shares characteristics with human pemphigus antibodies.
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Tsuobi R, Kurita Y, Negi M, Ogawa H. A specific inhibitor of keratinolytic proteinase from Candida albicans could inhibit the cell growth of C. albicans. J Invest Dermatol 1985; 85:438-40. [PMID: 3902988 DOI: 10.1111/1523-1747.ep12277147] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The authors investigated the influence of culture medium pH and various kinds of protease inhibitors on the growth of Candida albicans when cultivated in liquid medium containing human stratum corneum (HSC) as the nitrogen source. Rapid growth of C. albicans was observed with weakly acidic media, particularly at pH 4.0. From among the various kinds of protease inhibitors added to the media at pH 4.0, pepstatin, a carboxyl protease inhibitor, most strongly inhibited the growth of C. albicans dependent upon its concentration. The antifungal effect of pepstatin was not fungicidal, but was nevertheless effective even at a very low concentration of 0.01 microgram/ml. This inhibitory effect of pepstatin was considerably stronger than that of the well-known antifungal agent, clotrimazole. Pepstatin is a specific inhibitor of keratinolytic proteinase (KPase) from C. albicans; it belongs to the carboxyl proteinases group and has an optimum pH at 4.0. Pepstatin showed a strong antifungal effect, possibly through KPase inhibition, in biologic (HSC) medium that was similar to that encountered in vivo. Our results suggest that KPase may play an important role in the growth of C. albicans and that pepstatin has the possibility of being used as a new type of antifungal agent.
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Abstract
Human stratum corneum was extracted in Tris-HCl containing EDTA and phenylmethylsulfonyl fluoride, separated on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, transblotted to nitrocellulose papers and reacted with rabbit antihuman epidermal transglutaminase (ETG) antibody. Protein-bound antibody was detected with a multistep peroxidase procedure. Proteins with a molecular weight of 50,000 (50kDa) and 72,000 daltons (72kDa) were stained when anti-ETG was used and not when second antibody alone or sera from nonimmunized animals were used. When ETG was treated with trypsin or organic solvents, there was no alteration in the mobility of the 50kDa ETG band, but there was complete disappearance of the 72kDa band. Antibody that bound 72kDa protein, when eluted from the blot, reacted with both 50kDa and 72kDa proteins; similarly, antibody that bound to the 50kDa protein, when eluted from the blot, reacted with both the 50kDa and 72kDa proteins. Partially purified 72kDa ETG activity was increased (3 to 16 times control levels) after heating at 56 degrees C in the presence of calcium and dithiothreitol or by treatment with trypsin. These studies, in conjunction with the previous studies of ETG activation, are consistent with there being two forms of ETG. The different forms may play a role in regulating enzyme activity.
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Abstract
Extensive morphological and biochemical studies were carried out on two sibling cases of ichthyosis linearis circumflexa. The condition was found to be similar to psoriasis in the following ways: effectiveness of PUVA therapy, psoriatic changes on light and electron microscopy, high urinary polyamine levels, elevation of several enzyme activities in the scales, and a remarkable change in keratin molecules. These results may reflect an increased epidermal proliferation with a reduced epidermal transit time, as occurs in psoriasis.
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Abstract
Candida albicans was able to produce a keratinolytic proteinase (KPase) when cultivated in a medium containing human stratum corneum as a nitrogen source. The KPase was purified to 108.5-fold by ion-exchange chromatography and gel filtration. The molecular weight of the enzyme was estimated to be 42,000 by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and gel filtration through Sephacryl S-200, while the isoelectric point was determined to be at pH 4.5. The enzyme had an optimum pH of 4.0 and was "inactive" below pH 2.5 and above pH 6.0. The activity of KPase after preincubation at various temperatures was stable up to 50 degrees C. The keratinolytic activity was not affected by the addition of nonionic detergents and divalent cations. The enzyme was a glycoprotein and contained a high content of aspartic acid residues (172/1000). Pepstatin and chymostatin inhibited the activity in a dose-dependent manner; however, neither the other group specific inhibitors tested nor the pepsin specific inhibitors, DAN or EPNP, showed any effect on the enzyme. From these inhibitory profiles, this enzyme was determined to be a carboxyl proteinase such as cathepsin D. Among the various substrates for proteolytic enzymes, KPase digested human stratum corneum as much as albumin and hemoglobin. In the three fractions (water soluble, keratin filamentous, and membranous) prepared from human stratum corneum, the keratin filamentous fraction was more susceptible to degradation by KPase than the other two fractions were. KPase also digested much less human fingernail (13%) than human stratum corneum, but did not show any signs of there being any digestion of human scalp hair. These studies suggest that KPase from C. albicans may play an important role in superficial infection by affecting the human stratum corneum of the skin and nail.
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Yoshiike T, Negi M, Hattori M, Ogawa H. Fractionation and characterization of the epidermal stratum corneum in bullous congenital ichthyosiform erythroderma (BCIE). J Dermatol 1983; 10:427-31. [PMID: 6199395 DOI: 10.1111/j.1346-8138.1983.tb01161.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Yoshiike T, Negi M, Manabe M, Takamori K, Ogawa H. Biochemical changes after the oral administration of retinoid in the horny layer of patients with keratinization disorders. J Dermatol 1982; 9:235-42. [PMID: 6752237 DOI: 10.1111/j.1346-8138.1982.tb02630.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Yoshiike T, Negi M, Manabe M, Hattori M, Ogawa H. Fractionation and characterization of the human epidermal stratum corneum in keratinization disorders. J Dermatol 1982; 9:243-51. [PMID: 6182173 DOI: 10.1111/j.1346-8138.1982.tb02631.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Abstract
The activity of crude human epidermal transglutaminase was enhanced remarkably following 24 hr preincubation at low pH (pH 4.5), whereas the pure human epidermal transglutaminase did not show enhancement of enzyme activity at low pHs. Preincubation of pure transglutaminase with rat liver lysosomal fractions (100 microgram/ml) caused a time-dependent enhancement of activity at pH 4.5, up to 4.5 times of the initial activity. This enhancement was specific for lysosomal fractions among the several rat liver subcellular fractions tested. The activity of purified transglutaminase stimulated by lysosomal fractions was inhibited by pepstatin (50 microgram/ml), chymostatin (50 microgram/ml) and EDTA (1 mM). Preincubation of purified transglutaminase with 5 to 100 microgram/ml cathepsin D caused a time-dependent enhancement of activity up to 9.5-fold over control. This enhancement was specific for cathepsin D among the several lysosomal enzymes tested. These in vitro observations suggest possible activation mechanisms of epidermal transglutaminase in vivo. Epidermal transglutaminase may be activated by lysosomal acid proteinases, such as cathepsin B1 and cathepsin D, which are released and activated during the autolytic stages in granular layer in epidermis.
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Takiuchi I, Higuchi D, Negi M. [The effect of keratinase on human epidermis, especially on stratum corneum (author's transl)]. Nihon Hifuka Gakkai Zasshi 1981; 91:119-25. [PMID: 7024585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Takahashi Y, Negi M, Taneda A, Hashimoto H, Ogawa H, Shiokawa Y. [Multiple bullae formation in a patient with SLE (author's transl)]. Ryumachi 1980; 20:260-7. [PMID: 7003758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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