Jochem Alsenz - Academia.edu (original) (raw)
Papers by Jochem Alsenz
European Journal of Pharmaceutical Sciences
Journal of Pharmaceutical and Biomedical Analysis
Molecular Pharmaceutics, 2017
Pharmaceutical Research, Jul 1, 2000
Journal of Immunological Methods, Apr 22, 1988
Pharmaceutical Research, 1997
Behring Institute Mitteilungen, Aug 1, 1989
A new type of acquired C1-inhibitor (C1-INH) deficiency has been recognized (AAE type II) which i... more A new type of acquired C1-inhibitor (C1-INH) deficiency has been recognized (AAE type II) which is characterized by the presence of autoantibodies to C1-INH and by a circulating 96 KD C1-INH molecule. The clinical manifestations and biochemical abnormalities of this novel autoimmune disease resemble those found in the other forms of acquired C1-INH deficiency (AAE type I), including recurrent angioedema and low serum levels of C2, C4, C1, C1q and C1-INH activity. However, in contrast to AAE type I, AAE type II is not associated to other diseases. Evidence has been provided that the anti-C1-INH antibodies play a major role in the development and maintenance of AAE type II. These autoantibodies seem to impede C1-INH activity, thus allowing unopposed activation of the complement and/or contact system and to induce the generation of the 96 KD C1-INH species in the patients' plasma.
Pharmaceutical Research, 2003
Deut Med Wochenschr, 1987
Molecular Pharmaceutics, 2015
Drug behavior in undercooled melts is highly important for pharmaceutics with regard to amorphous... more Drug behavior in undercooled melts is highly important for pharmaceutics with regard to amorphous solid dispersions, and therefore, categories were recently introduced that differentiate glass formers (GFs) from other drugs that are nonglass formers (nGFs). The present study is based on the assumption that molecular properties relevant for the so-called Prigogine-Defay (PD) ratio would be indicative of a drug's glass-forming ability. The PD ratio depends in theory on the entropy of fusion and molar volume. Experimental data were gathered from a broad set of pharmaceutical compounds (n = 54) using differential scanning calorimetry. The obtained entropy of fusion and molar volume were indeed found to significantly discriminate GFs from nGFs. In a next step, the entropy of fusion was predicted by different in silico methods. A first group contribution method provided rather unreliable estimates for the entropy of fusion, while an alternative in silico approach seemed more promising for drug categorization. Thus, a significant discrimination model employed molar volume, a so-called effective hydrogen bond number, and effective number of torsional bonds (or torsional units) to categorize GFs and nGFs (p ≤ 0.0000). The results led to new insights into drug vitrification and to practical rules of thumb. The latter may serve as guidance in pharmaceutical profiling and early formulation development with respect to amorphous drug formulations.
Crystal Growth & Design, 2015
European Journal of Pharmaceutical Sciences, 2015
DMW - Deutsche Medizinische Wochenschrift, 1987
Clinical Chemistry, 1989
THE CLINICAL ENZYMOLOGY OF THE COMPLEMENT SYSTEM Michael Loos and Jochem Alsenz Institute of Medi... more THE CLINICAL ENZYMOLOGY OF THE COMPLEMENT SYSTEM Michael Loos and Jochem Alsenz Institute of Medical Microbiology Johannes Gutenberg ... primate erythrocytes, platelets C5b-C9 Membrane damage: Lysis of cells, eg red cells and gram-negative bacteria THE ...
Clinical pharmacology and therapeutics, 2005
Surfactants used in pharmaceutical formulations can modulate drug absorption by multiple mechanis... more Surfactants used in pharmaceutical formulations can modulate drug absorption by multiple mechanisms including inhibition of intestinal P-glycoprotein (P-gp). Our objective was to analyze the effect of 2 surfactants with different affinity for P-gp in vitro on the intestinal absorption and bioavailability of the P-gp substrate talinolol in humans. In vitro, the influence of surfactants on talinolol permeability was studied in Caco-2 cells. In vivo, an open-label 3-way crossover study with 9 healthy male volunteers was performed. Subjects were intubated with a 1-lumen nasogastrointestinal tube. The study solution, containing either talinolol (50 mg), talinolol and D-alpha-tocopheryl polyethylene glycol 1000 succinate (TPGS) (0.04%), or talinolol and Poloxamer 188 (0.8%), was administered through the tube. TPGS, but not Poloxamer 188, inhibited the P-gp-mediated talinolol transport in Caco-2 cells. In healthy volunteers TPGS increased the area under the plasma concentration-time curve ...
Pharmaceutical research, 1997
During long-term treatment of various malignant or viral diseases with IFN-alpha up to 20% of pat... more During long-term treatment of various malignant or viral diseases with IFN-alpha up to 20% of patients develop anti-IFN-alpha antibodies for as yet unknown reasons. To address this issue, a mouse model using Balb/C mice was established and the relevance of several potentially anti-IFN-alpha antibodies inducing factors was studied. The model revealed that both a higher frequency of injections and a higher dosage of IFN-alpha were more immunogenic and that the route of administration affected the antibody response to IFN-alpha. The intrinsic immunostimulatory activity of IFN-alpha itself also enhanced the immune response. IFN-alpha protein aggregates (IFN-alpha-IFN-alpha and human serum albumin (HSA)-IFN-alpha aggregates), which were recently identified in all marketed IFN-alpha products, were significantly more immunogenic than IFN-alpha monomers. These aggregates broke the tolerance against human IFN-alpha monomers in human IFN-alpha transgenic mice. Based on these animal studies it...
Pharmaceutical research, 1997
Protein aggregates are thought to be involved in the immunogenicity of recombinant proteins in hu... more Protein aggregates are thought to be involved in the immunogenicity of recombinant proteins in humans. To probe human IFN-alpha formulations for the presence of soluble protein aggregates, enzyme-linked immunosorbent assays (ELISA) were developed. For the detection of IFN-alpha-IFN-alpha and HSA-IFN-alpha aggregates, sandwich ELISAs were developed using a monoclonal anti-IFN-alpha antibody as a capture antibody and the same anti-IFN-alpha antibody and an anti-human serum albumin (HSA) antibody (HRP-labeled), respectively. Marketed freeze-dried, HSA-containing IFN-alpha-formulations tested in the ELISAs all contained IFN-alpha-IFN-alpha and/or HSA-IFN-alpha protein aggregates, although in varying amounts. These aggregates were predominantly IFN-alpha dimers and 1:1 conjugates of HSA with IFN-alpha. Test formulations revealed that aggregation of IFN-alpha was strongly affected by the presence of pharmaceutical excipients, pH of the formulation, lyophilisation procedure, and storage te...
Complement and inflammation, 1989
The biologic activities mediated by the products of complement activation include cellular, bacte... more The biologic activities mediated by the products of complement activation include cellular, bacterial, and viral lysis, inflammation, phagocytosis, and immunoregulation. These responses are achieved through the interaction of the activated forms of several of the complement proteins with cell membrane proteins. This report reviews aspects of the structure, ligand specificity, and function of the various complement receptors with particular emphasis on those receptors which bind to the activated fragments of C3. In addition, we briefly summarize the surface proteins on foreign particles that bind C3 and their possible role in the pathogenesis of these organisms.
European Journal of Pharmaceutical Sciences
Journal of Pharmaceutical and Biomedical Analysis
Molecular Pharmaceutics, 2017
Pharmaceutical Research, Jul 1, 2000
Journal of Immunological Methods, Apr 22, 1988
Pharmaceutical Research, 1997
Behring Institute Mitteilungen, Aug 1, 1989
A new type of acquired C1-inhibitor (C1-INH) deficiency has been recognized (AAE type II) which i... more A new type of acquired C1-inhibitor (C1-INH) deficiency has been recognized (AAE type II) which is characterized by the presence of autoantibodies to C1-INH and by a circulating 96 KD C1-INH molecule. The clinical manifestations and biochemical abnormalities of this novel autoimmune disease resemble those found in the other forms of acquired C1-INH deficiency (AAE type I), including recurrent angioedema and low serum levels of C2, C4, C1, C1q and C1-INH activity. However, in contrast to AAE type I, AAE type II is not associated to other diseases. Evidence has been provided that the anti-C1-INH antibodies play a major role in the development and maintenance of AAE type II. These autoantibodies seem to impede C1-INH activity, thus allowing unopposed activation of the complement and/or contact system and to induce the generation of the 96 KD C1-INH species in the patients' plasma.
Pharmaceutical Research, 2003
Deut Med Wochenschr, 1987
Molecular Pharmaceutics, 2015
Drug behavior in undercooled melts is highly important for pharmaceutics with regard to amorphous... more Drug behavior in undercooled melts is highly important for pharmaceutics with regard to amorphous solid dispersions, and therefore, categories were recently introduced that differentiate glass formers (GFs) from other drugs that are nonglass formers (nGFs). The present study is based on the assumption that molecular properties relevant for the so-called Prigogine-Defay (PD) ratio would be indicative of a drug's glass-forming ability. The PD ratio depends in theory on the entropy of fusion and molar volume. Experimental data were gathered from a broad set of pharmaceutical compounds (n = 54) using differential scanning calorimetry. The obtained entropy of fusion and molar volume were indeed found to significantly discriminate GFs from nGFs. In a next step, the entropy of fusion was predicted by different in silico methods. A first group contribution method provided rather unreliable estimates for the entropy of fusion, while an alternative in silico approach seemed more promising for drug categorization. Thus, a significant discrimination model employed molar volume, a so-called effective hydrogen bond number, and effective number of torsional bonds (or torsional units) to categorize GFs and nGFs (p ≤ 0.0000). The results led to new insights into drug vitrification and to practical rules of thumb. The latter may serve as guidance in pharmaceutical profiling and early formulation development with respect to amorphous drug formulations.
Crystal Growth & Design, 2015
European Journal of Pharmaceutical Sciences, 2015
DMW - Deutsche Medizinische Wochenschrift, 1987
Clinical Chemistry, 1989
THE CLINICAL ENZYMOLOGY OF THE COMPLEMENT SYSTEM Michael Loos and Jochem Alsenz Institute of Medi... more THE CLINICAL ENZYMOLOGY OF THE COMPLEMENT SYSTEM Michael Loos and Jochem Alsenz Institute of Medical Microbiology Johannes Gutenberg ... primate erythrocytes, platelets C5b-C9 Membrane damage: Lysis of cells, eg red cells and gram-negative bacteria THE ...
Clinical pharmacology and therapeutics, 2005
Surfactants used in pharmaceutical formulations can modulate drug absorption by multiple mechanis... more Surfactants used in pharmaceutical formulations can modulate drug absorption by multiple mechanisms including inhibition of intestinal P-glycoprotein (P-gp). Our objective was to analyze the effect of 2 surfactants with different affinity for P-gp in vitro on the intestinal absorption and bioavailability of the P-gp substrate talinolol in humans. In vitro, the influence of surfactants on talinolol permeability was studied in Caco-2 cells. In vivo, an open-label 3-way crossover study with 9 healthy male volunteers was performed. Subjects were intubated with a 1-lumen nasogastrointestinal tube. The study solution, containing either talinolol (50 mg), talinolol and D-alpha-tocopheryl polyethylene glycol 1000 succinate (TPGS) (0.04%), or talinolol and Poloxamer 188 (0.8%), was administered through the tube. TPGS, but not Poloxamer 188, inhibited the P-gp-mediated talinolol transport in Caco-2 cells. In healthy volunteers TPGS increased the area under the plasma concentration-time curve ...
Pharmaceutical research, 1997
During long-term treatment of various malignant or viral diseases with IFN-alpha up to 20% of pat... more During long-term treatment of various malignant or viral diseases with IFN-alpha up to 20% of patients develop anti-IFN-alpha antibodies for as yet unknown reasons. To address this issue, a mouse model using Balb/C mice was established and the relevance of several potentially anti-IFN-alpha antibodies inducing factors was studied. The model revealed that both a higher frequency of injections and a higher dosage of IFN-alpha were more immunogenic and that the route of administration affected the antibody response to IFN-alpha. The intrinsic immunostimulatory activity of IFN-alpha itself also enhanced the immune response. IFN-alpha protein aggregates (IFN-alpha-IFN-alpha and human serum albumin (HSA)-IFN-alpha aggregates), which were recently identified in all marketed IFN-alpha products, were significantly more immunogenic than IFN-alpha monomers. These aggregates broke the tolerance against human IFN-alpha monomers in human IFN-alpha transgenic mice. Based on these animal studies it...
Pharmaceutical research, 1997
Protein aggregates are thought to be involved in the immunogenicity of recombinant proteins in hu... more Protein aggregates are thought to be involved in the immunogenicity of recombinant proteins in humans. To probe human IFN-alpha formulations for the presence of soluble protein aggregates, enzyme-linked immunosorbent assays (ELISA) were developed. For the detection of IFN-alpha-IFN-alpha and HSA-IFN-alpha aggregates, sandwich ELISAs were developed using a monoclonal anti-IFN-alpha antibody as a capture antibody and the same anti-IFN-alpha antibody and an anti-human serum albumin (HSA) antibody (HRP-labeled), respectively. Marketed freeze-dried, HSA-containing IFN-alpha-formulations tested in the ELISAs all contained IFN-alpha-IFN-alpha and/or HSA-IFN-alpha protein aggregates, although in varying amounts. These aggregates were predominantly IFN-alpha dimers and 1:1 conjugates of HSA with IFN-alpha. Test formulations revealed that aggregation of IFN-alpha was strongly affected by the presence of pharmaceutical excipients, pH of the formulation, lyophilisation procedure, and storage te...
Complement and inflammation, 1989
The biologic activities mediated by the products of complement activation include cellular, bacte... more The biologic activities mediated by the products of complement activation include cellular, bacterial, and viral lysis, inflammation, phagocytosis, and immunoregulation. These responses are achieved through the interaction of the activated forms of several of the complement proteins with cell membrane proteins. This report reviews aspects of the structure, ligand specificity, and function of the various complement receptors with particular emphasis on those receptors which bind to the activated fragments of C3. In addition, we briefly summarize the surface proteins on foreign particles that bind C3 and their possible role in the pathogenesis of these organisms.