Inflammation and Repair Practice Questions

Q: Which of the following is least associated with the mediation of inflammation?

IFN. ***Myeloperoxidase*** - Myeloperoxidase is primarily an enzyme involved in the **oxidative burst** of neutrophils, not a classic mediator of inflammation. - It plays a role in **microbial killing** but does not directly participate in inflammation mechanisms like cytokines do. *IFN* - Interferons (IFNs) are cytokines crucial in immune responses and have roles in **inflammatory signaling** [1]. - They are produced in response to **viral infections** and activate immune cells, thus mediating inflammation. *Prostaglandins/Interleukins* - Prostaglandins are lipid compounds that promote **vasodilation** and **sensitize pain receptors**, key factors in the inflammatory process [1][2]. - Interleukins are a diverse group of cytokines that play significant roles in **cell signaling** during inflammation [1][3]. *TNF* - Tumor Necrosis Factor (TNF) is a major pro-inflammatory cytokine crucial in promoting systemic inflammation [1]. - It is involved in the activation of other inflammatory mediators and is significant in numerous inflammatory diseases [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 101. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 95-96. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 93-94. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 99-100.

Q: Who described the four classical features of inflammation?

Aulus Cornelius Celsus. ***Aulus Cornelius Celsus*** - Credited with describing the **four classical features of inflammation**: redness, heat, swelling, and pain [1]. - His work **De Medicina** laid the groundwork for understanding inflammation in clinical settings. *Aristotle* - Although a significant figure in early medicine and philosophy, he did not specifically describe the features of inflammation. - His contributions focused more on **natural philosophy** rather than detailed clinical observations of inflammation. *Galen* - A prominent physician whose works expanded upon earlier knowledge, but he did not delineate the four classical features of inflammation. - His emphasis was on **anatomy and physiology**, which laid a foundation for later medical understanding, but not specifically on inflammation. *Hippocrates (contributed to medical knowledge but not specific to inflammation)* - Known as the "Father of Medicine," Hippocrates made pivotal contributions to medicine but did not explicitly describe the classical features of inflammation. - His teachings laid the foundations for **clinical observation** but lacked detail about inflammation's characteristics as outlined by Celsus. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 185-186.

Q: The most characteristic cells found in a granuloma are?

Giant cells. ***Lymphocytes*** - Lymphocytes are crucial components of granulomas, involved in the immune response and chronic inflammation [1]. - They play a key role in activating macrophages, which form the central structure of the granuloma [1]. *Mast cells* - These cells are primarily involved in allergic responses and the **release of histamine**, not in granuloma formation. - They are not typically a **dominant cell type** seen in granulomatous inflammation. *Neutrophilis* - Neutrophils are usually associated with **acute inflammation** and are not the primary cells in a granuloma, which is characterized by chronic inflammation. - Their presence is more typical in **abscesses** or early inflammatory responses rather than in mature granulomas. *Giant cells* - While giant cells can be present in granulomas, they are formed from the fusion of macrophages and are a secondary feature rather than the most frequently found cells [1][2]. - Granulomas are primarily composed of **lymphocytes and macrophages**, making giant cells less predominant [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 360-362.

Q: TGF-β is involved in all of the following processes of angiogenesis, except:

Formation of the vascular lumen. ***Formation of the vascular lumen*** - TGF-β is **not directly involved** in forming the vascular lumen, which is primarily the result of endothelial cell behavior. - Its primary role in angiogenesis involves promoting other processes rather than lumen formation itself [1]. *Increases the synthesis of collagen* - TGF-β plays a significant role in **enhancing collagen synthesis**, contributing to tissue remodeling during angiogenesis [1]. - This process is critical for stabilizing blood vessels and is consistent with its role in **fibrosis**. *Stimulates fibroblast migration and proliferation* - TGF-β is known to **stimulate fibroblast migration** and proliferation, which aids in the formation of granulation tissue and new blood vessels [2]. - It is essential for wound healing and tissue repair processes involving angiogenesis. *Decreases the degradation of ECM* - TGF-β helps to **reduce ECM degradation**, promoting stability of newly formed blood vessels during angiogenesis [1]. - It regulates proteins that inhibit matrix metalloproteinases, thus retaining ECM integrity. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 115-116. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 117-119.

Q: Granulation tissue is replaced by connective tissue in what stage of wound healing?

21 days. ***21 days*** - Granulation tissue formation is prominent until about **21 days**, after which it starts to reorganize into fibrous connective tissue [1][2]. - In this stage, collagen deposition increases, contributing to **wound strength** and integrity [2]. *1 month* - By this time, connective tissue maturation continues but the primary transition from granulation tissue typically completes by **21 days** [2]. - It may lead to overestimation of healing progression as remodeling may still be ongoing. *14 days* - At **14 days**, granulation tissue is still present and not yet fully replaced by connective tissue [1]. - This stage primarily involves **vascularization** and **inflammatory responses**, not complete fibrous change [1]. *7 days* - This early phase is characterized by **hemostasis** and **inflammation**, with granulation tissue just beginning to form [1]. - Significant connective tissue replacement has not yet occurred, as the wound healing process is still at the initial stages. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 117-119. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 119-121.

Q: Which of the following interleukins is primarily raised during a fever?

IL-6. ***IL-6*** - **IL-6** is a **pro-inflammatory cytokine** that plays a central role in the acute phase response and is a major mediator of fever. - It acts on the **hypothalamus** to increase the body's set point temperature, leading to fever. *IL-1β* - While **IL-1β** is also a **pyrogenic cytokine** that contributes to fever, IL-6 is often cited as the primary driver due to its strong effect on the acute phase response and direct action on the thermoregulatory center. - **IL-1β** stimulates the production of other inflammatory mediators, including IL-6, which then directly influences fever. *IL-10* - **IL-10** is an **anti-inflammatory cytokine** that primarily functions to suppress immune responses and reduce inflammation, not induce fever. - Its role is to **downregulate the production** of pro-inflammatory cytokines, thus counteracting the effects that would lead to fever. *IL-2* - **IL-2** is primarily involved in the **growth, proliferation, and differentiation of T cells** during an immune response. - While it plays a crucial role in cellular immunity, it is not considered a primary mediator of fever.

Q: All of the following are pyrogenic cytokines, EXCEPT:

Interleukin 18 (IL-18). ***Interleukin 18 (IL-18)*** - IL-18 is not considered a **pyrogenic cytokine**; instead, it plays a role in **enhancing Th1 responses** and supporting cell-mediated immunity. - While it does have inflammatory properties, its main functions are related to **activation of T and NK cells**, not direct pyrogenic effects. *Interleukin 6 (IL-6)* - IL-6 is a classic **pyrogenic cytokine** that induces fever by acting on the hypothalamus. - It plays a significant role in the **acute phase response** and inflammation. *Tumor Necrosis Factor (TNF)* - TNF is another well-known **pyrogenic cytokine**, involved in systemic inflammation and inducing fever [1]. - It also promotes apoptosis and acts on the hypothalamus to raise body temperature. *Interferon alpha (IFN-α)* - IFN-α is involved in the immune response against **viral infections** and also has some role in **fever induction**, but is not classified primarily as a pyrogenic cytokine. - It primarily functions through **antiviral activity** and stimulation of immune cells rather than inducing fever directly [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 97.

Q: The characteristic cell of a granulomatous reaction is:

Epithelioid cell. ***Epithelioid cell*** - Epithelioid cells are activated **macrophages** that are a hallmark of granulomatous inflammation, forming the core of the granuloma [1]. - These cells are characterized by their large size, abundant cytoplasm, and **epithelial-like appearance**, crucial for tuberculous and other granulomatous diseases [1,2]. *Eosinophil* - Eosinophils are primarily involved in **allergic reactions** and **parasitic infections**, not granulomatous reactions. - While present in some conditions (like asthma), they do not contribute to the **formation of granulomas**. *Lymphocyte* - Lymphocytes are involved in **adaptive immunity** but are not the main cell type in granulomatous reactions. - They contribute to inflammation but do not form the characteristic structures seen in **granulomas** [1]. *Plasma cell* - Plasma cells are differentiated **B cells** responsible for producing antibodies, not associated with granulomatous inflammation. - Their roles are more aligned with humoral immunity rather than the **granulomatous response**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, p. 360.

Q: Which amino acid is derived from arginine and is important for the formation of neutrophilic extracellular traps (NETs)?

Citrulline. ***Citrulline*** - **Citrulline** is crucial for the formation of neutrophilic extracellular traps (NETs) [1] as it plays a role in the **post-translational modification** of histones, which is essential for uncoiling DNA. - Its metabolism is directly linked to the production of **neutrophil-derived reactive oxygen species (ROS)**, further supporting NET formation. *Methionine* - While **methionine** is an important amino acid, it is primarily involved in **protein synthesis** and **methylation processes**, not directly in NET formation. - It does not play a significant role in the **nuclear processes** required for the production of NETs. *Valine* - **Valine** is a branched-chain amino acid primarily involved in **energy metabolism** and muscle repair, and does not directly contribute to NET formation. - It lacks a specific role in the **activation of neutrophils** or the structural aspects of NET development. *Leucine* - **Leucine** is another branched-chain amino acid that plays a key role in **protein synthesis**, particularly in muscle tissue, rather than in **immune response mechanisms**. - Its function does not include the direct involvement in the mechanisms of **NET formation** by neutrophils. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 91-92.

Q: Epithelioid granulomatous lesions are found in all of the following diseases except:

Pneumocystis jirovecii. ***Pneumocystis carinii*** - Epithelioid granulomatous lesions are **not associated** with Pneumocystis carinii (now called **Pneumocystis jirovecii** in humans), which causes opportunistic infections without granulomatous response [1]. - Typically presents as **interstitial pneumonia** with foamy alveolar exudates rather than granulomatous inflammation [1]. *Berylliosis* - This condition is characterized by **granulomatous lung disease**, particularly with **epithelioid granulomas** in the lung tissue [2]. - It's caused by exposure to **beryllium**, often seen in occupational settings [2]. *TB* - Tuberculosis (TB) is well-known for inducing **caseating granulomas**, but it can also show **epithelioid granulomas** in active disease [3]. - Typically starts in the lungs and can disseminate, forming granulomas in various organs [3]. *Sarcoidosis* - Sarcoidosis is defined by the presence of **non-caseating epithelioid granulomas** primarily in the lungs but can affect other organs too [2]. - Commonly linked with **bilateral hilar lymphadenopathy** and respiratory symptoms. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 318-319. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 198-200. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 320-321.

Question 1

Which of the following is least associated with the mediation of inflammation?

Accepted Answer

IFN

Answer

Prostaglandins/Interleukins

Answer

Myeloperoxidase

Answer

TNF

Question 2

Who described the four classical features of inflammation?

Accepted Answer

Aulus Cornelius Celsus

Answer

Hippocrates

Answer

Aristotle

Answer

Galen

Question 3

The most characteristic cells found in a granuloma are?

Accepted Answer

Giant cells

Answer

Mast cells

Answer

Lymphocytes

Answer

Neutrophils

Question 4

TGF-β is involved in all of the following processes of angiogenesis, except:

Accepted Answer

Formation of the vascular lumen

Answer

Increases the synthesis of collagen

Answer

Decreases the degradation of ECM

Answer

Stimulates fibroblast migration and proliferation

Question 5

Granulation tissue is replaced by connective tissue in what stage of wound healing?

Accepted Answer

21 days

Answer

7 days

Answer

14 days

Answer

1 month

Question 6

Which of the following interleukins is primarily raised during a fever?

Accepted Answer

IL-6

Answer

IL-10

Answer

IL-2

Answer

IL-1β

Question 7

All of the following are pyrogenic cytokines, EXCEPT:

Accepted Answer

Interleukin 18 (IL-18)

Answer

Interleukin 6 (IL-6)

Answer

Tumor Necrosis Factor (TNF)

Answer

Interferon alpha (IFN-α)

Question 8

The characteristic cell of a granulomatous reaction is:

Accepted Answer

Epithelioid cell

Answer

Plasma cell

Answer

Lymphocyte

Answer

Eosinophil

Question 9

Which amino acid is derived from arginine and is important for the formation of neutrophilic extracellular traps (NETs)?

Accepted Answer

Citrulline

Answer

Leucine

Answer

Methionine

Answer

Valine

Question 10

Epithelioid granulomatous lesions are found in all of the following diseases except:

Accepted Answer

Pneumocystis jirovecii

Answer

TB

Answer

Sarcoidosis

Answer

Berylliosis

Inflammation and Repair — MCQs

Inflammation and Repair — MCQs

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