Biologia molecolare

Recent research into the anatomy and pathophysiology of the blood-brain and blood-spinal cord barriers suggests that a breakdown in these barriers can result in several diseases affecting the central nervous system (CNS). This book presents new findings in the area of blood-brain barrier research that suggest barriers play important roles in health and disease conditions. It also discusses the development of new drugs that can modulate the barrier function in the CNS and may provide new approaches to treating neurological diseases such as Alzheimer's disease and other motor neuron diseases, as well as spinal cord trauma. This book presents the recent progress made in the research on the blood-brain and spinal cord barrier. It contains numerous illustrations of light and electron micrographs. It also includes Foreword written by two eminent researchers in the field, Milton Brightman and Jorge Cervos-Navarro.

This volume is a new edition of the most authoritative book on Prion Biology, first published in 1999 and edited by the Nobel Prize-winning founder of the field. This expanded edition has been completely updated, and includes chapters on therapeutics, and diagnostic methods and approaches.

Anthony Killeen, MD, PhD, offers a comprehensive yet concise introduction to molecular pathology that encompasses both applied and theoretical knowledge. Writing in a very readable style, the author reviews the basic concepts of human molecular biology, explains the principles of the most commonly used analytical methods, and discusses the molecular principles that underlie both inherited diseases and acquired genetic abnormalities that lead to cancer. Using common viral infections as examples, the book applies these molecular methods to the detection of microbial pathogens. The growing importance of pharmacogenetics and identity testing in the clinical laboratory is also highlighted.

This survey on the "state-of-the-science" of stem cell biology explains the origins of stem cells and describes how they function, how they can cause illness, and how they might be employed to cure or ameliorate disease. In particular, the authors discuss the roles of stem cells in development and organogenesis, in normal tissue turnover, in the repair response to injury, and in carcinogenesis. They also explain how to obtain stem cells from different organs, culture them in vitro, and manipulate them for therapeutic use.

During the last 30 years there has been a growing interest in cytokines as biological molecules able to regulate the most diverse functions in living org- isms, mainly at the level of cell-cell communication. Originally their definition was limited to the cells of the immune system (interleukins and lymphokines), but later that definition was extended to all cells, and their regulatory activity in such other processes as differentiation, apoptosis, angiogenesis, and wound he- ing has been now demonstrated. They comprise a group of small proteins (5-20 kDa) produced and released by cells in a tightly controlled fashion, active in the nano- or picomolar concentration range, and eliciting specific effects in nei- boring cells; therefore, their action is said to be autocrine, paracrine, or jux- crine. The latter property distinguishes them from hormones, which are produced by one tissue and are transported by the blood stream in order to act on a distant tissue. Chemokines are a subset of cytokines, but whether growth factors are included in the group is often a matter of discussion. The activity of several cytokines can be inhibited by other cytokines or by biological response modi- ers; therefore, the latter are sometimes called "anti-cytokines. " The biological response of a particular cell is usually the result of the sum of all interactions with cytokines present at a certain time and in a certain sequence in time-the "cytokine network.

Superantigen Protocols assembles experimental protocols that have proved useful for the study of superantigens. These techniques will allow researchers from various areas of cell biology, microbiology, immunology, biochemistry, and molecular biology to assess the physical characteristics and biological effects of well-known superantigens as well as of putative substances that might have superantigenic activities, and to explore therapies for superantig- induced effects. Microbial exotoxins have been studied for decades as virulence factors because of their pathogenic effects. The term "superantigen" was coined by Marrack and Kappler a decade ago for some of these molecules because of their potent T-cell stimulatory activities. In recent years, advances in mole- lar biology provide recombinant as well as natural superantigens in highly purified form for physical characterization. Superantigens are now used extensively as tools to study interactions between receptors on cells of the immune system as they bind to major histocompatibility complex class II m- ecules on antigen-presenting cells and V regions of T-cell receptors. The b- ? logical effects that result from these interactions are studied both in vitro and in vivo. The intent of this book is, therefore, to bring together up-to-date te- niques developed by experts in the field of biochemistry, immunology, and molecular biology for the study of superantigens. Superantigen Protocols begins with an overview of the field to provide background information on the various classes of superantigens and their str- ture.

The aim of MHC Protocols is to document protocols that can be used for the analysis of genetic variation within the human major histocompatibility complex (MHC; HLA region). The human MHC encompasses approximately 4 million base pairs on the short arm of chromosome 6 at cytogenetic location 6p21. 3. The region is divided into three subregions. The telomeric class I region contains the genes that encode the HLA class I molecules HLA-A, -B, and -C. The centromeric class II region contains the genes encoding the HLA class II molecules HLA-DR, -DQ, and -DP. In between is the class III region, originally identified because it contains genes encoding components of the complement pathway. The entire human MHC has recently been sequenced (1) and each subregion is now known to contain many other genes, a number of which have immunological functions. The study of polymorphism within the MHC is well established, because the region contains the highly polymorphic HLA genes. HLA polymorphism has been used extensively in solid organ and bone marrow transplantation to match donors and recipients. As a result, large numbers of HLA alleles have been identified, a process that has been further driven by recent interest in HLA gene diversity in ethnic populations. The extreme genetic variation in HLA genes is believed to have been driven by the evolutionary response to infectious agents, but relatively few studies have analyzed associations between HLA genetic variation and infectious disease, which has been difficult to demonstrate.