Relative bioavailability between two teriparatide formulations in healthy volunteers.

OBJECTIVE: To compare the pharmacokinetics, relative bioavailability (RB), immunogenicity, and safety after a single dose of test or reference formulation of teriparatide in healthy human volunteers in order to demonstrate whether both products are similar. RESEARCH DESIGN AND METHODS: We compared pharmacokinetic parameters, immunogenicity, and safety after a single dose of two formulations (Osteofortil® and Forteo®) of teriparatide in a randomizedsequence, open-label, two-period crossover study in 24 healthy volunteers. The washout period between formulations was 7 days. Blood samples were collected at baseline and 0, 5, 10, 15, 20, 25, 30, 45, 60, 75, 90, 120, 150 minutes, and 3 and 4 hours after administration. Teriparatide concentrations were determined using ELISA. Adverse events were monitored. RESULTS: Geometric mean (90% CI) Cmax for test and reference formulations were 165.86 (153.35 - 212.13) and 175.37 (164.04 - 221.04) pg/mL, the AUC0-t was 14,932 (5,275 - 15,752) and 14,153 (1,861 - 16,875) pg×min/mL, and the AUC0-∞ was 16,147 (15,047 - 18,799) and 15,467 (14,473 - 18,126) pg×min/mL, respectively. The test/reference ratios (90% CI) for Cmax, AUC0-t, and AUC0-∞ were 94.58% (85.29 - 104.87), 105.5% (97.77 - 113.84), and 104.4% (96.97 - 112.39), respectively No subject reported adverse events. CONCLUSION: Test formulation met pharmacokinetic criteria for bioequivalence.

Development of a Biosimilar of Agalsidase Beta for the Treatment of Fabry Disease: Preclinical Evaluation.

BACKGROUND AND OBJECTIVE: Fabry disease (FD) is a rare lysosomal storage disorder caused by a deficiency of the enzyme α-galactosidase A (aGal A). Since 2001, two different enzyme replacement therapies have been authorized, with agalsidase beta being used in most parts of the Western world. Currently, biosimilars of several expensive enzyme therapies are under development to improve their accessibility for patients. We present the preclinical results of the development of a biosimilar to agalsidase beta. METHODS: Produced in a Chinese hamster ovary (CHO)-cell system, the biosimilar aGal A Biosidus (AGABIO), was compared with agalsidase beta with respect to amino acid sequence, glycosylation, specific α-galactosidase activity, stability in plasma, and effects on cultured human Fabry fibroblasts and Fabry mice. RESULTS: AGABIO had the same amino acid composition and similar glycosylation, enzymatic activity, and stability as compared with agalsidase beta. After uptake in fibroblasts, α-galactosidase A activity increased in a dose-dependent manner, with maximum uptake observed after 24 h, which remained stable until at least 48 h. Both enzymes were localized to lysosomes. Reduction of accumulated globotriaosylceramide (Gb3) and lysoGb3 in cultured Fabry fibroblasts by AGABIO and agalsidase beta showed comparable dose-response curves. In Fabry knockout mice, after a single injection, both enzymes were rapidly cleared from the plasma and showed equal reductions in tissue and plasma sphingolipids. Repeated dose studies in rats did not raise any safety concerns. Anti-drug antibodies from patients with FD treated with agalsidase beta showed equal neutralization activity toward AGABIO. CONCLUSION: These findings support the biosimilarity of AGABIO in comparison with agalsidase beta. The clinical study phase is currently under development.

Pharmacokinetics and pharmacodynamics of interferon beta 1a in Cebus apella.

BACKGROUND: Recombinant human interferon (hIFN beta) is indicated for the treatment of multiple sclerosis. Its effect presents species restriction, thus lacking biological activity on most mammals. Although there have been previous studies of the pharmacology of INF beta in Old World primates, no data exists on New World primates. Therefore, we explored its effect on Cebus apella, a New World monkey, describing the pharmacology of this molecule when injected by subcutaneous route in this species. METHODS: Safety, pharmacokinetics and pharmacodynamics of IFN beta were evaluated in nine Cebus apella individuals. RESULTS: A single subcutaneous injection of 12 x 10(6) IU of hIFN beta 1a resulted in a median AUC((0-48)) (area under the curve) of 14.82 ng/ml, a C(max) (maximum plasma concentrations) of 1.51 ng/ml and a T(max) (time to achieve maximum plasma concentrations) of 3 h. IFN beta was biologically active as demonstrated by an increase in neopterin levels. There were no safety concerns. CONCLUSIONS: New World non-human primates are a suitable animal model for the study of IFN beta pharmacology.

High level expression of bioactive recombinant human growth hormone in the milk of a cloned transgenic cow.

Transgenic farm animals have been proposed as an alternative to current bioreactors for large scale production of biopharmaceuticals. However, the efficiency of both methods in the production of the same protein has not yet been established. Here we report the production of recombinant human growth hormone (hGH) in the milk of a cloned transgenic cow at levels of up to 5 g l(-1). The hormone is identical to that currently produced by expression in E. coli. In addition, the hematological and somatometric parameters of the cloned transgenic cow are within the normal range for the breed and it is fertile and capable of producing normal offspring. These results demonstrate that transgenic cattle can be used as a cost-effective alternative for the production of this hormone.

1H, 15N and 13C chemical shift assignments of the BA42 protein of the psychrophilic bacteria Bizionia argentinensis sp. nov.

BA42 is a protein belonging to the psychrophilic bacteria Bizionia argentinensis sp. nov. Bioinformatics analysis showed that it presents significant sequence identity with a Pfam A family, DUF 477, found both in eukarya and eubacteria but of unknown function in all these organisms. Here, we report the NMR spectra assignment of this 145 amino acid protein. These data will allow performing NMR structural studies with the aim of using the three-dimensional structure as relevant information in order to determine the function of this family of proteins.

Bioequivalence of two subcutaneous pharmaceutical products of interferon beta la.

Blastoferon, in the following referred to as the test product, is a pharmaceutical product of interferon beta la (CAS 220581-49-7) currently marketed as a biosimilar to the innovator Interferon beta la product (referred to as the reference product). Pharmacokinetics and pharmacodynamIcs assays are critically relevant to demonstrate similarity between biopharmaceuticals. The aims of the present study were to investigate the bioavailability (BA) of the test product (either absolute or relative to the innovator product) and to compare the extent of increase of neopterin concentration following administration of either product. Two studies were performed: initially, an absolute BA assay with i.v. and s.c. injection of test product to 12 healthy subjects. Second, a formal relative BA study with s.c. injections of 88 microg of both products to 24 healthy volunteers. Blood samples for pharmacokinetic and pharmacodynamic profiling were drawn at different intervals after injection. Interferon beta (IFNB) concentrations were determined by ELISA. In the absolute BA study, a single s.c. dose of 44 microg of the test product resulted in a median bioavailable fraction of 29%, a median T(max) of 4 h (4-6) and a C(max) of 3.69 (3.27-4.41) IU x ml(-1). In the relative BA study, values for the test product were: median T(max) of 3 h (2-18), C(max) of 5.39 (4.99-6.31) IU x ml(-1), AUC (0-72) of 142.86 (134.16-190.15) IU x h x ml(-1) and AUC(0-infinity) of 190.95 (174.23-303.13) IU x h x ml(-1). The corresponding values for the innovator product were: T(max) of 3 h (1-24), C(max) of 4.44 (4.12-5.40) IU x ml(-1), AUC(0-72) of 128.77 (121.18-170.92) IU x h x ml(-1) and AUC(0-affinity) of 192.61 (183.04-286.46) IU x h x ml(-1). The AUC(0-72) ratio was 111% (CI 90%: 106-116), the AUC(0-affinity) was 99% (CI 90%: 92-107) and the C(max) ratio was 121% (CI 90%: 112-131). IFNB1a increased neopterin levels in both studies. Both products induced side-effects commonly reported for IFN with no serious adverse events. This study presents pharmacokinetics parameters of the test product and demonstrates similar bioavailability of IFNB1a for both pharmaceutical products.

Immunologic and genetic markers in insulin-dependent diabetes mellitus (Type 1) in a argentine population

The objective was to evaluate the prevalence and association of several markers (islet cell antibodies: ICA, ainsulin autoantibodies: IAA, glutamic acid decarboxylase antibodies: GADA and ICA512 antibodies: ICA512A) along with HLA DQB1 genotype in type 1 diabetes mellitus of recent onset, including siblings and individuals without any history of this disease, in an Argentine population. A total of 79 children with type 1 diabetes mellitus of recent onset were studied, as well as 79 control children, and 68 healthy siblings of type 1 diabetic cases. IAA, ICA, GADA, ICA512A and HLA DQB1 alleles were determined. Sensitivity was 67.1 por ciento for ICA, 36.7 percent for IAA, 74.6 por ciento for GADA and 63.4 por ciento ICA512A. None of the control subjects was positive for the immunological markers. Combined sensitivity of ICA-IAA-GADA was 89.8 por ciento, similar to the ICA512A- GADA (87.3 percent) or ICA512A-GADA-IAA combination (91.1 por ciento ). GADA correlated positively with ICA, but no such correlation was found between IAA, ICA512A and ICA. IAA correlated negatively and GADA positively with age. IAA was associated to DQB1*0201, whereas ICA and ICA512A associated to DQB1*0302. Among siblings, 3/68 (4.4 percent) were positive for IAA and a single case (1.5 percent) was positive for GADA and one for ICA512A. Our findings show that the combination of multiple tests increases the sensitivity for prediction, with the ICA512A-GADA combination proving highly sensitive and equivalent to other proposed combinations, such as ICA-IAA-GADA.

Marcadores inmunológicos y genéticos en diabetes mellitus tipo 1 en Argentina / Immunologic and genetic markers in type 1 diabetes mellitus in Argentina

El objetivo del trabajo fue evaluar la prevalencia y asociación de los marcadores inmunológicos (anticuerpo anti-islote pancreático: ICA, autoanticuerpo anti-insulina: IAA, anticuerpo antidecarboxilasa del ácido glutámico: GADA y anticuerpo anti ICA512) y con el genotipo HLA DQBl en pacientes con diabetes tipo 1 de reciente debut, hermanos de diabéticos y personas sin historia de enfermedad autoinmune en población argentina. Se estudiaron 79 niños con diabetes tipo 1 de reciente debut, 79 niños controles y 68 hermanos sanos de niños con diabetes 1. En todos ellos se determinó IAA, GADA, ICA, ICA512 y alelos HLA DQB1. La sensibilidad para ICA fue de 67.1 por ciento; para IAA de 36,7 por ciento; para GADA de 74,6 por ciento, y para ICA512 de 63,4 por ciento. Ninguno de los niños control presentó marcadores inmunológicos positivos. La sensibilidad combinada de ICA-IAA-GADA fue de 89,8 por ciento, similar a la de ICA512-GADA (87.3 por ciento) o la combinación de ICA512-GADA-IAA (91.1 por ciento). El valor de GADA presentó correlación positiva con el de ICA, no encontrándose correlación alguna entre los valores de IAA, ICA512 e ICA. El valor de IAA presentó correlación negativa y el de GADA positiva con la edad de los pacientes. La presencia de IAA se asoció con DQB1 *0201, mientras que la de ICA e ICA512 con DQB1 *0302. Entre los hermanos, 3/68 (4,4 por ciento) fueron positivos para IAA, uno (1,5 por ciento) lo fue para GADA y otro (1.5 por ciento) para ICA512. Nuestros resultados muestran que la combinación de múltiples marcadores incrementa la sensibilidad predictiva, siendo la asociación ICA512-GADA altamente sensible y equivalente a otras combinaciones propuestas como ICA-IAA-GADA