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IMMUNOGLOBULINS AND THE HUMAN DEFENCE SYSTEM

Format: MS WORD  |  Chapter: 1-3  |  Pages: 47  |  2800 Users found this project useful  |  Price NGN5,000

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IMMUNOGLOBULINS AND THE HUMAN DEFENCE SYSTEM

 

CHAPTER ONE

INTRODUCTION

1.1 Background of the Study

The human immune system is a sophisticated network of cells, tissues, and organs working collaboratively to defend the body against pathogens, including bacteria, viruses, and parasites. Among the key components of this intricate defense mechanism are immunoglobulins, or antibodies, which play a vital role in identifying and neutralizing foreign invaders (Murphy et al., 2021). Immunoglobulins are glycoproteins produced by B cells, a type of white blood cell, and they are classified into five main classes: IgG, IgA, IgM, IgE, and IgD, each serving distinct functions within the immune response (Benson et al., 2022).

Immunoglobulin G (IgG) is the most abundant antibody in serum, constituting about 75% of the total immunoglobulin pool and playing a critical role in providing long-term immunity following infection or vaccination (Duncan et al., 2020). IgA is primarily found in mucosal areas, such as the gut, respiratory tract, and urogenital tract, where it acts as the first line of defense against pathogens entering through these routes (Kiyono & Fukuyama, 2018). Immunoglobulin M (IgM), the first antibody produced in response to an infection, is crucial for initiating the immune response (Bishop et al., 2021). Immunoglobulin E (IgE) is involved in allergic reactions and responses to parasitic infections, while immunoglobulin D (IgD) is less understood but believed to play a role in B cell activation (Harris & Smith, 2019).

The production and regulation of immunoglobulins are vital for maintaining immune homeostasis. A dysfunction in immunoglobulin production can lead to various immune disorders, including immunodeficiencies, where the body is unable to produce adequate antibodies to combat infections (Bhimji et al., 2020). On the other hand, overproduction of specific immunoglobulin classes can result in allergic conditions, autoimmune diseases, or even malignancies like multiple myeloma (Elliott & Jiang, 2021).

Recent studies have highlighted the dynamic nature of immunoglobulin responses, particularly in the context of infectious diseases such as COVID-19. Research indicates that the quality and quantity of immunoglobulins can significantly influence disease outcomes, with specific antibody profiles associated with better or worse prognoses (Alam et al., 2022). Moreover, the role of immunoglobulins in vaccination efficacy underscores their importance in public health strategies aimed at controlling infectious diseases (Srinivasan et al., 2021).

The interplay between immunoglobulins and various immune cells, such as T cells and antigen-presenting cells, further complicates the immune response. Understanding how these interactions shape the body's defense mechanisms is crucial for developing effective immunotherapies and vaccines (Davis et al., 2022). Moreover, ongoing research into the structural biology of immunoglobulins and their interactions with antigens is paving the way for

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