Biosimilar Antibodies
C3bBbP, Human, ELISA kit, Hycult Biotech, HK3002
The complement system is a vital component of innate immunity, serving initially as the first line of defense against pathogens. It consists of three activation pathways: the classical, lectin, and alternative pathways, all converging at the activation of complement protein C3. The alternative pathway is unique in its ability to amplify immune responses via the formation of the C3 convertase complex, C3bBb, which plays a crucial role in pathogen clearance and immune surveillance. C3bBbP, also known as the properdin-stabilized C3 convertase, is an extended form of C3bBb. Properdin, the only known positive regulator of complement activity, binds to C3bBb, increasing its stability and prolonging its function. This stabilization enhances the cleavage of C3 into C3a and C3b, leading to a powerful amplification loop that ensures rapid immune responses. However, dysregulation of this mechanism can contribute to pathological conditions. Elevated levels of C3bBbP have been implicated in complement-mediated diseases, including C3 glomerulopathy (C3G) and atypical hemolytic uremic syndrome (aHUS). These disorders are characterized by excessive complement activation, leading to uncontrolled inflammation and tissue damage. Additionally, the presence of nephritic factors (autoantibodies that stabilize C3bBbP) can further disrupt complement homeostasis, exacerbating disease progression. The detection of C3bBbP serves as a potential diagnostic biomarker for alternative pathway complement-associated diseases. Its measurement helps to assess alternative pathway activity, providing valuable insights into disease mechanisms and possibly guiding complement-targeted therapies. As complement-directed treatments continue to progress, the role of C3bBbP is becoming increasingly significant.
Host
Human
Reactivity
Applications
Conjugation
C3c, Human, ELISA kit, Hycult Biotech, HK368
C3c, a key component in the complement system, plays a vital role in the body’s defense against infections and in regulating immune responses. Unlike other complement biomarkers, C3c stands out for its stability, not binding to pathogens or cell receptors, and thereby ensuring accurate assessment of immune activity. This makes C3c an invaluable marker for detecting inflammation and potential autoimmune disorders like HUS. Its association with cardiovascular health and Parkinson’s disease further elevates its utility.
Host
Human
Reactivity
Applications
Conjugation
C3c, Human, mAb 4, Hycult Biotech, HM2200
Understanding the Role of C3c in the Complement System and Immune Response The complement system is critical in both innate and adaptive immune responses, producing inflammatory and protective reactions against pathogenic challenges. This article sheds light on the role of C3c, a vital component of this system. The Complement System: A Network of Proteins and Receptors Comprising a complex family of proteins and receptors, the complement system operates in circulation, tissues, and various body fluids. It activates through three pathways: the classical pathway, initiated by immune complexes; the lectin pathway, triggered by surface-bound lectins; and the alternative pathway (AP), activated by unprotected surfaces. Each pathway generates a C3 convertase, a serine protease that cleaves the central complement protein C3 into C3b. C3 Convertases: Amplifiers of Complement Activity C3 and C5 convertases are crucial in initiating and amplifying the activity of the complement pathways, leading to the formation of the cytolytic MAC. The synthesis of C3, and consequently C3c, is tissue-specific and modulated in response to various stimuli. The cleavage of C3 by C3 convertase results in the formation of C3a and C3b. The Formation and Significance of C3c Upon binding to the cell surface, C3b initiates the terminal complement pathway, forming the C5 convertase. Further cleavage by trypsin-like enzymes transforms C3b into iC3b, then C3c, and finally C3dg. The slow transformation of C3dg into C3d in the blood means that C3dg is more prevalent. C3, with a molecular weight of approximately 185 kDa, is the complement system’s most abundant protein, with serum levels around 1.3 mg/ml. C3c: A Biomarker in Disease Diagnosis C3 activation products, including C3c, play roles in various diseases such as transplantation rejection, kidney diseases, AMD, and inflammatory diseases. Surface-bound C3 proteins, particularly through complement receptor 2 (CR2), are instrumental in regulating the adaptive immune response. Consequently, complement fragments like C3c serve as biomarkers for many of these conditions. While C3dg’s binding to the cell membrane is unstable, its release makes it an attractive diagnostic biomarker, reflecting ongoing complement activation more accurately than C3 and C4 levels. Not sure which C3 antibody to use? With numerous options available, it is essential to select the right C3 antibody to ensure the success of your research. We designed a guide to assist you in making an informed decision: Go to our C3 researcher’s guide and choose the right antibody
Host
Human
Reactivity
Applications
Conjugation
C3c, Human, mAb F1-4, Hycult Biotech, HM2318
C3c in the Complement System and Immune Response The complement system is critical in both innate and adaptive immune responses, producing inflammatory and protective reactions against pathogenic challenges. This article sheds light on the role of C3c, a vital component of this system. The Complement System: A Network of Proteins and Receptors Comprising a complex family of proteins and receptors, the complement system operates in circulation, tissues, and various body fluids. It activates through three pathways: the classical pathway, initiated by immune complexes; the lectin pathway, triggered by surface-bound lectins; and the alternative pathway (AP), activated by unprotected surfaces. Each pathway generates a C3 convertase, a serine protease that cleaves the central complement protein C3 into C3b. C3 Convertases: Amplifiers of Complement Activity C3 and C5 convertases are crucial in initiating and amplifying the activity of the complement pathways, leading to the formation of the cytolytic MAC. The synthesis of C3, and consequently C3c, is tissue-specific and modulated in response to various stimuli. The cleavage of C3 by C3 convertase results in the formation of C3a and C3b. The Formation and Significance of C3c Upon binding to the cell surface, C3b initiates the terminal complement pathway, forming the C5 convertase. Further cleavage by trypsin-like enzymes transforms C3b into iC3b, then C3c, and finally C3dg. The slow transformation of C3dg into C3d in the blood means that C3dg is more prevalent. C3, with a molecular weight of approximately 185 kDa, is the complement system’s most abundant protein, with serum levels around 1.3 mg/ml. C3c: A Biomarker in Disease Diagnosis C3 activation products, including C3c, play roles in various diseases such as transplantation rejection, kidney diseases, AMD, and inflammatory diseases. Surface-bound C3 proteins, particularly through complement receptor 2 (CR2), are instrumental in regulating the adaptive immune response. Consequently, complement fragments like C3c serve as biomarkers for many of these conditions. While C3dg’s binding to the cell membrane is unstable, its release makes it an attractive diagnostic biomarker, reflecting ongoing complement activation more accurately than C3 and C4 levels. Not sure which C3 antibody to use? With numerous options available, it is essential to select the right C3 antibody to ensure the success of your research. We designed a guide to assist you in making an informed decision: Go to our C3 researcher’s guide and choose the right antibody
Host
Human
Reactivity
Applications
Conjugation
C3d, Human, clone HB2C2, Hycult Biotech, HM2422
The Vital Role of C3d in the Complement System and Immune Response The complement system is a cornerstone of both innate and adaptive immune responses, offering protective and inflammatory reactions against pathogenic challenges before adaptive responses initiate. This article highlights the crucial role of C3d, a key fragment in this system. Complex Mechanisms of the Complement System This system is a complex array of proteins and receptors present in circulation, tissues, and other body fluids. It activates through three pathways: the classical pathway, triggered by immune complexes; the lectin pathway, initiated by surface-bound lectins; and the alternative pathway (AP), activated by surfaces not specifically protected against it. Each pathway creates a C3 convertase, cleaving the central complement protein C3 into C3b and generating C3d. C3 Convertases: Catalysts in Complement Activation C3 and C5 convertases are enzymatic complexes critical for initiating and amplifying complement pathway activities, leading to the formation of the cytolytic MAC. The synthesis of C3, from which C3d is derived, is tissue-specific and modulated by various stimuli. Post-cleavage, C3 yields anaphylotoxin C3a and activating fragment C3b. The Path to C3d Formation Once bound to the cell surface, C3b initiates the terminal complement pathway, forming the C5 convertase. Further cleavage of C3b by trypsin-like enzymes results in iC3b, subsequently leading to C3c and C3dg. Importantly, C3dg is further digested to form C3d, a process slower in blood, with C3dg being the predominant form. C3d: A Key Player in Disease and Immune Regulation C3, with a molecular weight of approximately 185kDa, is the most abundant protein in the complement system, with serum levels around 1.3 mg/ml. C3dg, and consequently C3d, play significant roles in diseases like transplantation rejection, kidney diseases, AMD, and various inflammatory diseases. Moreover, surface-bound C3 proteins, particularly through complement receptor2 (CR2), regulate the adaptive immune response. C3d: A Biomarker for Immune-Related Diseases Complement fragments, including C3d, are emerging as vital biomarkers for many diseases. The binding of C3dg to cell membranes, leading to the release of C3d, positions it as an attractive diagnostic biomarker, reflecting ongoing complement activation more accurately than C3 and C4 levels. However, most antibodies recognize an epitope on the C3d part of the alpha chain without differentiating between native and activated C3 proteins. Not sure which C3 antibody to use? With numerous options available, it is essential to select the right C3 antibody to ensure the success of your research. We designed a guide to assist you in making an informed decision: Go to our C3 researcher’s guide and choose the right antibody
Host
Human
Reactivity
Applications
Conjugation
C3d, Human, ELISA kit, Hycult Biotech, HK3017
C3d, a critical fragment of complement protein C3, significantly impacts innate and adaptive immunity. This system, encompassing a diverse array of proteins and receptors in the body’s fluids and tissues, activates through three pathways: classical, lectin, and alternative. Each pathway generates a C3 convertase, splitting C3 into C3b and the anaphylatoxin C3a. C3b’s further breakdown on cell surfaces kickstarts the terminal complement pathway, creating C3d. As the most abundant complement system protein, C3 has a molecular weight around 185kDa. C3d, at 38.9 KDa and non-glycosylated, emerges from C3b’s continual cleavage. It’s crucial in immune regulation, especially via interactions with complement receptor 2 (CR2). This role is essential in conditions like transplant rejection, kidney diseases, AMD, and various inflammatory diseases. C3d’s diagnostic value lies in its ability to indicate active complement activation, offering a more precise reflection than C3 and C4 levels. Despite the challenge that most antibodies can’t differentiate between C3d’s active and native states, its importance in the immune system and as a disease marker remains clear.
Host
Human
Reactivity
Applications
Conjugation
C3d, Human, mAb 3, Hycult Biotech, HM2198
Exploring the Integral Role of C3d in the Complement System and Innate Immunity The complement system is a vital component of innate immunity, with the third complement component, C3, playing a central role in the classical, alternative, and lectin pathways of complement activation. This article emphasizes the significance of C3 and its by-product, C3d, in immune system functioning. The Diversity and Activation of C3 in Immune Responses Activation products of the complement cascade, including C3d, contain unique neo-epitopes, which are absent in the native components. These neo-epitopes are crucial for the system’s response to pathogens. The synthesis of C3, from which C3d derives, is tissue-specific and adjusts in response to various stimulatory agents, demonstrating its adaptability in immune regulation. C3 Abundance and the Implications of its Deficiency C3 is notably the most abundant protein in the complement system, with serum levels around 1.3 mg/ml. Interestingly, an inherited deficiency of C3, and consequently C3d, predisposes individuals to more frequent bacterial infections, highlighting their importance in disease prevention. In conditions like ulcerative colitis and chronic inflammatory bowel disease, the deposition of C3 and C3d in diseased mucosa has been observed, indicating their role in immunopathology. The Proteolytic Journey The journey of C3, leading to the formation of C3d, begins with its cleavage by C3-convertases into C3a and C3b. C3b, upon attaching to immune complexes, undergoes further cleavage into iC3b and C3f. The subsequent processing of iC3b results in C3c and C3dg. Notably, C3dg can be further cleaved into C3d and C3g. It is important to note that the formation of C3d, a crucial step in immune response modulation, does not occur in plasma. Not sure which C3 antibody to use? With numerous options available, it is essential to select the right C3 antibody to ensure the success of your research. We designed a guide to assist you in making an informed decision: Go to our C3 researcher’s guide and choose the right antibody
Host
Human
Reactivity
Applications
Conjugation
C3g, Human, mAb 9, Hycult Biotech, HM2199
Understanding the Role of C3g in the Complement System and Innate Immunity The complement system plays a pivotal role in our body’s innate immunity, with the third complement component, C3, being a key player. In this article, we delve into the significance of C3 and its fragment, C3g, in various complement activation pathways and immune responses. Central Role of C3 in Complement Activation Pathways C3 is integral to the classical, alternative, and lectin pathways of complement activation. It’s fascinating how the activation of the complement cascade leads to the formation of neo-epitopes, which are distinct from the native components. These neo-epitopes, including C3g, have crucial functions in immune responses. Tissue-Specific Synthesis and Regulation of C3 Moreover, the synthesis of C3 is tissue-specific, highlighting its diverse roles in different bodily environments. Additionally, its production is modulated in response to various stimulatory agents, ensuring that C3, and consequently C3g, is available when needed by the immune system. C3: Abundance and Deficiency Implications With serum protein levels approximately at 1.3 mg/ml, C3 is the most abundant protein in the complement system. Importantly, a deficiency in C3, and by extension, C3g, can lead to increased susceptibility to bacterial infections, underscoring its importance in immune defense mechanisms. C3g’s Role in Immune Complex Formation and Immunopathology Furthermore, C3 fragments, including C3g, are deposited in tissues at sites of antibody-mediated immunopathology. This is notably observed in conditions like ulcerative colitis and chronic inflammatory bowel disease, where C3 deposition in mucosa is a significant finding. C3 Proteolysis and the Formation of C3g In conclusion, the breakdown of the C3 component, a process called proteolysis, is essential in our immune system. This task is carried out by enzymes known as C3-convertases. The process begins with the splitting of C3 into two fragments: C3a and C3b. Once formed, C3b plays a pivotal role by binding to immune complexes, which are critical in the body’s defense mechanisms. Following this, C3b undergoes further division to form two new components, iC3b and C3f. The journey continues as iC3b is processed into C3c and C3dg. Notably, C3dg can further split into C3d and C3g. This particular transformation, especially the formation of C3g, is significant. Although it does not take place in blood plasma, it is vital for specific immune responses in the body. Not sure which C3 antibody to use? With numerous options available, it is essential to select the right C3 antibody to ensure the success of your research. We designed a guide to assist you in making an informed decision: Go to our C3 researcher’s guide and choose the right antibody
Host
Human
Reactivity
Applications
Conjugation
C4, Human, mAb BSI1306, Hycult Biotech, HM2444
The monoclonal C4 antibody BSI1306 (HM2444) recognizes an epitope on the α-chain of C4. The C4 glycoprotein is a large key molecule in the activation of the classical and lectin pathway. The formed proteolytic complexes of both pathways lead to cleavage of C4 thereby releasing the anaphylotoxin C4a and the pathway activating C4b. Binding of C4b to the cell surface leads to the formation of the C5 convertases, which is the start of the terminal pathway of complement. C4 functions as an acute phase protein and has a concentration of 150-600 μg/ml in healthy individuals. The majority of the protein is synthesized in the liver but also locally by among others monocytes, macrophages, lung, spleen, kidney and intestinal epithelial cells. After activation of C4 the nascent C4b is quickly inactivated by its reaction with water. Only surface bound C4b forms the basis of formation of the CP/LP convertases. Total C4 concentration reflects potential to activate the complement system via the classical or lectin pathway.
Host
Human
Reactivity
Applications
Conjugation
C4, Mouse, ELISA kit, Hycult Biotech, HK217
The complement system play important roles in both innate and adaptive immune response and can produce an inflammatory and protective reaction to challenges from pathogens before an adaptive response can occur. There are three pathways of complement activation. The classical pathway, the lectin pathway and the alternative pathway. The C3 and C5 convertases are enzymatic complexes that initiate and amplify the activity of the complement pathways and ultimately generate the cytolytic MAC. The C4 glycoprotein is a large key molecule in the activation of the classical and lectin pathway. The formed proteolytic complexes of both pathways lead to cleavage of C4 thereby releasing the anaphylotoxin C4a and the pathway activating C4b. Binding of C4b to the cell surface leads to the formation of the C5 convertases, which is the start of the terminal pathway of complement. C4 functions as an acute phase protein and has a concentration of 250-500 ug/ml in healthy individuals. The majority of the protein is synthesized in the liver but also locally by among others monocytes, macrophages, lung, spleen, kidney and intestinal epithelial cells. Its expression is regulated by 4 genes, C4A and C4B, which are located in the HLA class III region. Although 99% identical, they have a different activity profile which is due to substrate specificity. C4A is more reactive and binds amino and thiol groups, while C4B binds more rapidly to hydroxyl groups. After activation of C4 the nascent C4b is quickly inactivated by its reaction with water. Only surface bound C4b forms the basis of formation of the CP/LP convertases. Total C4 concentration reflects potential to activate the complement system via the classical or lectin pathway. Changes in complement levels may reflect chronic and/or recurring inflammation. C4 helps to prevent onset of autoimmune disease. Although rare, C4 deficiency is associated with SLE and chronic mucosal infections. Complement has a functional role in clearance of immune complexes or apoptotic cells. Incomplete removal could lead to formation of autoantibodies. Furthermore, complement is relevant in tolerance and deletion of autoreactive B cells.
Host
Mouse
Reactivity
Applications
Conjugation
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