Pharmaceutical Biotechnology – serie

Investigation of the pharmacokinetics and metabolism of human proteins has escalated over the last two decades because of the use of recombinant human proteins as therapeutic agents. In addition, the development and improvement of analytical techniques enabling the detection of minute quantities of proteins in biological matrices have aided this process. In assembling this volume, we sought to provide a state-of-the-art as­ sessment of the pharmacokinetics and metabolism of protein therapeutics through complete reviews of selected examples. A comprehensive review of all protein therapeutics was not attempted; the majority -of the therapeutic protein classes and crucial scientific issues have been addressed, however. Therefore, we are confident that this volume will provide a useful reference for scientists in this field. The volume has been divided into two general parts. The first part (Chapters 1-3) is composed of general reviews of topics of importance in pharmacokinetic/metabolism studies of proteins: goals and analytical meth­ odologies, effects of binding proteins, and effects of antibody induction, respectively. The second part (Chapters 4-8) consists of specific, detailed reviews by therapeutic protein class: growth factors and hormones, cyto­ kines, cardiovascular proteins, hematopoietic proteins, and antibodies, respectively. The editors are grateful to the contributors for the patience, personal sacrifice and perseverance required to complete this volume. BoDDE L. FERRAIOLO MARJORIE A. MOHLER CAROL A. GLOFF ix Contents Chapter 1 Goals and Analytical Methodologies for Protein Disposition Studies Bobbe L. Ferraiolo and Marjorie A. Mohler 1. Introduction ................................................. .

Part B explores protein degradation occuring in vivo during protein synthesis in cells, examines the isolation and purification of proteins, details protein use in organisms, and reviews techniques to enhance protein stability.

This volume attemptsto provide the formulation scientist with casehistories involving the use of therapeutic proteins and peptides that have been mar- keted or are under clinical testing. In previous volumes of this series,funda- mental theories and principles ofprotein characterization and stability were presented in depth by researchers in their fieldsofexpertise. The way from theory to practice isnot alwaysobvious and straightforward. There isa need for practical examples of how the principles and theories are put into use, specificallyin the development of a pharmaceutical product. It is our hope that this volume will fulfillsuch a need. Itisnot asimple task to choose a panel ofproteinsand peptides from the over 200 agents in human clinical trials. We have tried to collect a wide representation of molecules of different sizes-from 10 amino acids (Leu- prolide) to 1020 amino acids (Muromonab CD3). The examples include agents derived from various sources including monoclonal antibodies (Mur- omonab CD3), recombinant DNA (human and bovine growth hormones), natural source (fibrolase), and chemical synthesis (Leuprolide). Clearly this list is not intended to be encyclopedic.It isthe first time a collection of this sort has been made accessibleto the formulation scientists involved in devel- oping protein and peptide products. Although each chapter in this volume focuses primarily on the charac- terization and stability of a specific molecule, each has unique aspects.

In response to the tremendous increase in the number of protein and peptide drugs, this treatise critically reviews transport and metabolism mechanisms relating to the delivery of endogenous and recombinant proteins to mammalian organs, tissues, and cells. It will promote fruitful collaboration among academic and industrial scientists in the fields of pharmacology, cell biology, biochemistry, physiology, and immunology.

Proteins are still gaining importance in the pharmaceutical world, where they are used to improve our arsenal of therapeutic drugs and vaccines and as diagnostic tools. Proteins are different from "traditional" low-molecular-weight drugs. As a group, they exhibit a number of biopharmaceutical and formulation problems. These problems have drawn considerable interest from both industrial and aca­ demic environments, forcing pharmaceutical scientists to explore a domain previ­ ously examined only by peptide and protein chemists. Biopharmaceutical aspects of proteins, e.g., low oral bioavailability, have been extensively investigated. Although all possible conventional routes of ad­ ministration have been examined for proteins, no real, generally applicable alter­ native to parenteral administration in order to achieve systemic effects has yet been discovered. Several of these biopharmaceutical options have been discussed in Volume 4 of this series, Biological Barriers to Protein Delivery. Proteins are composed of many amino acids, several of which are notorious for their chemical instability. Rational design of formulations that optimize the native structure and/or bioactivity of a protein is therefore of great importance when long shelf life is required, as it is for pharmaceutical products. This issue has also been examined in two prior volumes of this series: Volume 2: Stability of Protein Pharmaceuticals (Part A) and Volume 5: Stability and Characterization of Protein and Peptide Drugs.

Pharmaceutical scientists in industry and academia will appreciate this single reference for its detailed experimental procedures for conducting biopharmaceutical studies. This well-illustrated guide allows them to establish, validate, and implement commonly used in situ and in vitro model systems. Chapters provide ready access to these methodologies for studies of the intestinal, buccal, nasal and respiratory, vaginal, ocular, and dermal epithelium as well as the endothelial and elimination barriers.

Leading scientists offer detailed profiles of ten protein drugs currently in development. The case histories of these important new compounds are described from the perspective of their formulation, characterization, and stability. This ready reference also features recent data and an abundance of previously unpublished information. The in-depth coverage includes a highly useful compendium of degradation sites occurring in over 70 proteins. An invaluable aid in the rapid identification of potential `hot spots' in proteins, this accessible compilation allows for inspection of the protein's primary structure and preparation of a hydroflex plot.

Protein and peptide therapeutics currently represent eight of the top 100 prescription pharmaceuticals in the U.S., and biotechnology products are projected to account for 15% of the total US. prescription drug market by 2003. Of the protein and peptide products now on the market, many are administered as daily injections,though several are deliveredby noninvasive routes. For example, desmopressin is delivered as a nasal spray, and deoxyribonuclease I is administered by inhalation. Although cyclosporin A is orally active, as yet there are no general means to confer oral bioava- ability to peptides and proteins. A major advance in delivery ofpeptides was achieved with the introduction of a monthly injectable, biodegradable microsphere formulation of LHRH. Despite the enormous success of biotechnology products to date, much effort continues to be focused on the development of more convenient and noninvasive routes of administration for those products that require f- quent and prolonged dosing. Here we present an overview of the te- nologies, both developed and emerging, which are applicable to protein delivery.In addition, chapters 11 through 13 detail case studies on physical methods for delivery ofinsulin and growth hormone.

In the late 1980s, it became painfully evident to the pharmaceutical industry that the old paradigm of drug discovery, which involved highly segmented drug - sign and development activities, would not produce an acceptable success rate in the future. Therefore, in the early 1990s a paradigm shift occurred in which drug design and development activities became more highly integrated. This new str- egy required medicinal chemists to design drug candidates with structural f- tures that optimized pharmacological (e. g. , high affinity and specificity for the target receptor), pharmaceutical (e. g. , solubility and chemical stability), bioph- maceutical (e. g. , cell membrane permeability), and metabolic/pharmacokinetic (e. g. , metabolic stability, clearance, and protein binding) properties. Successful implementation of this strategy requires a multidisciplinary team effort, incl- ing scientists from drug design (e. g. , medicinal chemists, cell biologists, en- mologists, pharmacologists) and drug development (e. g. , analytical chemists, pharmaceutical scientists, physiologists, and molecular biologists representing the disciplines of pharmaceutics, biopharmaceutics, and pharmacokinetics/drug metabolism). With this new, highly integrated approach to drug design now widely utilized by the pharmaceutical industry, the editors of this book have provided the sci- tific community with case histories to illustrate the nature of the interdisciplinary interactions necessary to successfully implement this new approach to drug d- covery. In the first chapter, Ralph Hirschmann provides a historical perspective of why this paradigm shift in drug discovery has occurred.

Because progress in the field of transporters has been extraordinary, this volume will focus on recent advances in our understanding of the structure, function, physiology, and molecular biology of membrane transporters. There will be an emphasis on transporters as molecular targets for drug delivery and disposition in the body.

Recombinant proteins and polypeptides continue to be the most important class of biotechnology-derived agents in today's pharmaceutical industry. Over the past few years, our fundamental understanding of how proteins degrade and how stabilizing agents work has made it possible to approach formulation of protein pharmaceuticals from a much more rational point of view.This book describes the current level of understanding of protein instability and the strategies for stabilizing proteins under a variety of stressful conditions.

This text focuses on development, manufacture, and commercialization of pharmaceutical protein dosage forms. It envelops and emphasizes GMP attributes of quality, safety, purity, and strength. Each author provides practical, proven approaches and methods to achieve quality protein dosage forms on a commercial scale. It delves deep into practical detail on the requirements, and how to meet them, for developing, manufacturing, and gaining regulatory approval of protein dosage forms.

Protein and peptide therapeutics currently represent eight of the top 100 prescription pharmaceuticals in the U.S., and biotechnology products are projected to account for 15% of the total US. prescription drug market by 2003. Of the protein and peptide products now on the market, many are administered as daily injections,though several are deliveredby noninvasive routes. For example, desmopressin is delivered as a nasal spray, and deoxyribonuclease I is administered by inhalation. Although cyclosporin A is orally active, as yet there are no general means to confer oral bioava- ability to peptides and proteins. A major advance in delivery ofpeptides was achieved with the introduction of a monthly injectable, biodegradable microsphere formulation of LHRH. Despite the enormous success of biotechnology products to date, much effort continues to be focused on the development of more convenient and noninvasive routes of administration for those products that require f- quent and prolonged dosing. Here we present an overview of the te- nologies, both developed and emerging, which are applicable to protein delivery.In addition, chapters 11 through 13 detail case studies on physical methods for delivery ofinsulin and growth hormone.

In the late 1980s, it became painfully evident to the pharmaceutical industry that the old paradigm of drug discovery, which involved highly segmented drug - sign and development activities, would not produce an acceptable success rate in the future. Therefore, in the early 1990s a paradigm shift occurred in which drug design and development activities became more highly integrated. This new str- egy required medicinal chemists to design drug candidates with structural f- tures that optimized pharmacological (e. g. , high affinity and specificity for the target receptor), pharmaceutical (e. g. , solubility and chemical stability), bioph- maceutical (e. g. , cell membrane permeability), and metabolic/pharmacokinetic (e. g. , metabolic stability, clearance, and protein binding) properties. Successful implementation of this strategy requires a multidisciplinary team effort, incl- ing scientists from drug design (e. g. , medicinal chemists, cell biologists, en- mologists, pharmacologists) and drug development (e. g. , analytical chemists, pharmaceutical scientists, physiologists, and molecular biologists representing the disciplines of pharmaceutics, biopharmaceutics, and pharmacokinetics/drug metabolism). With this new, highly integrated approach to drug design now widely utilized by the pharmaceutical industry, the editors of this book have provided the sci- tific community with case histories to illustrate the nature of the interdisciplinary interactions necessary to successfully implement this new approach to drug d- covery. In the first chapter, Ralph Hirschmann provides a historical perspective of why this paradigm shift in drug discovery has occurred.

In this era of biotechnology there have been many books covering the fundamentals of recombinant DNA technology and protein chemistry. However, not many sources are available for the pharmaceutical develop­ ment scientist and other personnel responsible for the commercialization of the finished dosage forms of these new biopharmaceuticals and other products from biotechnology. This text will help to fill this gap. Once active biopharmaceutical molecules are candidates for clinical trial investigation and subsequent commercialization, a number of other activities must take place while research and development on these molecules continues. The active ingredient itself must be formulated into a finished dosage form that can be conveniently used by health care professionals and patients. Properties of the biopharmaceutical molecule must be clearly understood so that the appropriate finished product formulation can be developed. Finished product formulation development includes not only the chemical formulation, but also the packaging system, the manufacturing process, and appropriate control strategies to assure such good manufacturing practice attributes as safety, identity, strength, purity, and quality.

Recombinant proteins and polypeptides continue to be the most important class of biotechnology-derived agents in today's pharmaceutical industry. Over the past few years, our fundamental understanding of how proteins degrade and how stabilizing agents work has made it possible to approach formulation of protein pharmaceuticals from a much more rational point of view.This book describes the current level of understanding of protein instability and the strategies for stabilizing proteins under a variety of stressful conditions.

In response to the tremendous increase in the number of protein and peptide drugs, this treatise critically reviews transport and metabolism mechanisms relating to the delivery of endogenous and recombinant proteins to mammalian organs, tissues, and cells. It will promote fruitful collaboration among academic and industrial scientists in the fields of pharmacology, cell biology, biochemistry, physiology, and immunology.

Leading scientists offer detailed profiles of ten protein drugs currently in development. The case histories of these important new compounds are described from the perspective of their formulation, characterization, and stability. This ready reference also features recent data and an abundance of previously unpublished information. The in-depth coverage includes a highly useful compendium of degradation sites occurring in over 70 proteins. An invaluable aid in the rapid identification of potential `hot spots' in proteins, this accessible compilation allows for inspection of the protein's primary structure and preparation of a hydroflex plot.

Because progress in the field of transporters has been extraordinary, this volume will focus on recent advances in our understanding of the structure, function, physiology, and molecular biology of membrane transporters. There will be an emphasis on transporters as molecular targets for drug delivery and disposition in the body.

Proteins are still gaining importance in the pharmaceutical world, where they are used to improve our arsenal of therapeutic drugs and vaccines and as diagnostic tools. Proteins are different from "traditional" low-molecular-weight drugs. As a group, they exhibit a number of biopharmaceutical and formulation problems. These problems have drawn considerable interest from both industrial and aca­ demic environments, forcing pharmaceutical scientists to explore a domain previ­ ously examined only by peptide and protein chemists. Biopharmaceutical aspects of proteins, e.g., low oral bioavailability, have been extensively investigated. Although all possible conventional routes of ad­ ministration have been examined for proteins, no real, generally applicable alter­ native to parenteral administration in order to achieve systemic effects has yet been discovered. Several of these biopharmaceutical options have been discussed in Volume 4 of this series, Biological Barriers to Protein Delivery. Proteins are composed of many amino acids, several of which are notorious for their chemical instability. Rational design of formulations that optimize the native structure and/or bioactivity of a protein is therefore of great importance when long shelf life is required, as it is for pharmaceutical products. This issue has also been examined in two prior volumes of this series: Volume 2: Stability of Protein Pharmaceuticals (Part A) and Volume 5: Stability and Characterization of Protein and Peptide Drugs.

This volume attemptsto provide the formulation scientist with casehistories involving the use of therapeutic proteins and peptides that have been mar- keted or are under clinical testing. In previous volumes of this series,funda- mental theories and principles ofprotein characterization and stability were presented in depth by researchers in their fieldsofexpertise. The way from theory to practice isnot alwaysobvious and straightforward. There isa need for practical examples of how the principles and theories are put into use, specificallyin the development of a pharmaceutical product. It is our hope that this volume will fulfillsuch a need. Itisnot asimple task to choose a panel ofproteinsand peptides from the over 200 agents in human clinical trials. We have tried to collect a wide representation of molecules of different sizes-from 10 amino acids (Leu- prolide) to 1020 amino acids (Muromonab CD3). The examples include agents derived from various sources including monoclonal antibodies (Mur- omonab CD3), recombinant DNA (human and bovine growth hormones), natural source (fibrolase), and chemical synthesis (Leuprolide). Clearly this list is not intended to be encyclopedic.It isthe first time a collection of this sort has been made accessibleto the formulation scientists involved in devel- oping protein and peptide products. Although each chapter in this volume focuses primarily on the charac- terization and stability of a specific molecule, each has unique aspects.

Pharmaceutical scientists in industry and academia will appreciate this single reference for its detailed experimental procedures for conducting biopharmaceutical studies. This well-illustrated guide allows them to establish, validate, and implement commonly used in situ and in vitro model systems. Chapters provide ready access to these methodologies for studies of the intestinal, buccal, nasal and respiratory, vaginal, ocular, and dermal epithelium as well as the endothelial and elimination barriers.