Immunosuppressive Drugs Pha 430

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1. The cyclosporine-cyclophilin complex serves as an inhibitor on what component in the cytoplasm:

Explanation

The correct answer is Calcineurin. The cyclosporine-cyclophilin complex acts as an inhibitor on calcineurin, a phosphatase enzyme found in the cytoplasm. By inhibiting calcineurin, the complex prevents the activation of transcription factors like NFAT, which are involved in the immune response. This inhibition helps to suppress the immune system and is used in the treatment of autoimmune diseases and to prevent rejection in organ transplantation. Neuricalcin and mTOR are not components inhibited by the cyclosporine-cyclophilin complex.

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About This Quiz
Pharmacology Quizzes & Trivia

This quiz titled 'Immunosuppressive Drugs PHA 430' assesses knowledge on cyclosporine, including its mechanism, effects, and clinical applications. It also covers critical interventions like RhoGAM for Rh- mothers.... see moreEssential for students and professionals in pharmacology and medicine. see less

2. Belatacept is a drug generated by recombinant DNA technology, by fusing the Fc region of IgG1 to the extracellular domain of CTLA-4

Explanation

Belatacept is a drug that is indeed generated using recombinant DNA technology. This technology involves combining genetic material from different sources to create a new DNA sequence. In the case of Belatacept, the Fc region of IgG1 (a type of antibody) is fused with the extracellular domain of CTLA-4 (a protein involved in regulating immune responses). This fusion creates a novel molecule that can modulate the immune system and is used as an immunosuppressive drug in certain transplant procedures. Therefore, the statement is true.

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3. Tacrolimus is roughly 50-100x more potent than cyclosporine

Explanation

Tacrolimus is a medication that is used to suppress the immune system and prevent organ rejection in transplant patients. It is considered to be roughly 50-100 times more potent than cyclosporine, another immunosuppressive drug. This means that tacrolimus requires a lower dose to achieve the same therapeutic effect as cyclosporine. The higher potency of tacrolimus can be advantageous as it may lead to fewer side effects and better patient outcomes. Therefore, the statement "Tacrolimus is roughly 50-100x more potent than cyclosporine" is true.

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4. Belatacept is associated with B-cell cancers in the CNS (e.g. PTLD), as well as increased risk of infection from bacterial/viral/fungal/protozoal sources

Explanation

Belatacept is a medication that is used to prevent organ rejection in transplant patients. However, it has been found to be associated with an increased risk of certain types of cancer, specifically B-cell cancers in the central nervous system (CNS), such as post-transplant lymphoproliferative disorder (PTLD). Additionally, belatacept can weaken the immune system, making individuals more susceptible to infections caused by bacteria, viruses, fungi, and protozoa. Therefore, the statement that belatacept is associated with B-cell cancers in the CNS and increased risk of infection is true.

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5. Rapamycin inhibits IL-2 receptor dependent cell cycling

Explanation

Rapamycin is known to inhibit the IL-2 receptor-dependent cell cycling. This means that it prevents the activation and proliferation of immune cells, specifically T cells, which rely on the IL-2 receptor signaling pathway for their growth and division. By inhibiting this pathway, rapamycin can effectively suppress the immune response, making it useful in certain medical applications such as preventing organ transplant rejection or treating autoimmune diseases. Therefore, the statement "Rapamycin inhibits IL-2 receptor dependent cell cycling" is true.

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6. Match the drug interactions with cyclosporine:
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7. Cyclosporine is poorly orally bioavailable, with an oral F of 20-50%.

Explanation

The statement is true because it states that Cyclosporine has a poor oral bioavailability, with an oral F (fraction absorbed) of 20-50%. This means that when Cyclosporine is taken orally, only a small percentage of the drug is actually absorbed into the bloodstream, resulting in low bioavailability.

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8. Cyclosporine metabolism primarily takes place how?

Explanation

Cyclosporine metabolism primarily takes place hepatically, meaning it is mainly metabolized in the liver. This suggests that the liver plays a crucial role in breaking down and eliminating cyclosporine from the body.

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9. Because rapamycin is associated with _____________, it should be started _________ a transplant

Explanation

Rapamycin is associated with impaired wound healing, which means it can slow down the process of healing wounds. Therefore, it should be started after a transplant surgery to avoid further complications in wound healing. Starting rapamycin before the surgery may hinder the healing process and delay the recovery.

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10. Tacrolimus is a macrolide antibiotic

Explanation

This is what he has in the slides, although other sources on the internet suggest it is simply a macrolide, of which some are antibiotics.

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11. Abatacept and belatacept differ by only _____ amino acids. (Use only the number in numeric form)

Explanation

Abatacept and belatacept differ by only 2 amino acids.

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12. The MOA of tacrolimus is identical to cyclosporine, with no deviations

Explanation

The statement is false because the MOA (mechanism of action) of tacrolimus is not identical to cyclosporine. While both drugs are immunosuppressants used in organ transplantation, they have different mechanisms of action. Tacrolimus inhibits the production of cytokines, which are involved in the immune response, while cyclosporine inhibits the production of interleukin-2, a key cytokine for T-cell activation. Therefore, there are deviations in their MOA.

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13. What step of the MOA of tacrolimus is different from cyclosporine?

Explanation

The step of the MOA of tacrolimus that is different from cyclosporine is the formation of the substrate complex. Tacrolimus binds and forms a complex with FK06, while cyclosporine does not inhibit calcineurin. This difference in the formation of the substrate complex is what sets tacrolimus apart from cyclosporine in their mechanisms of action.

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14. Everolimus is similar to rapamycin except that it is used after tissue transplantation for the prevention of graft rejection

Explanation

Everolimus is indeed similar to rapamycin. Both drugs belong to a class of medications called mTOR inhibitors, and they work by suppressing the immune system. However, the key difference is that everolimus is specifically used after tissue transplantation to prevent graft rejection. This means that the statement "Everolimus is similar to rapamycin except that it is used after tissue transplantation for the prevention of graft rejection" is true.

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15. Which of the following transplant types is belatacept approved for?

Explanation

Belatacept is a medication that is used to prevent organ rejection in kidney transplant patients. Therefore, it is specifically approved for kidney transplants. It is not approved for bone marrow, liver, or stomach/kidney/pancreas transplants.

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16. Tacrolimus is less orally bioavailable than cyclosporine

Explanation

Only ~25% oral F with tac

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17. Cyclosporine is used for heart, kidney, and lung transplants, as well as GVHD, but not autoimmune disorders

Explanation

Cyclosporine is a medication commonly used to prevent organ rejection in heart, kidney, and lung transplant patients, as well as to treat graft-versus-host disease (GVHD). However, it is also used to manage various autoimmune disorders such as rheumatoid arthritis, psoriasis, and Crohn's disease. Therefore, the statement that Cyclosporine is not used for autoimmune disorders is incorrect.

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18. Which statement is incorrect regarding cyclosporine?

Explanation

Increased expression of growth factor

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19. Rapamycin is similar to tacrolimus in that it is a macrolide, binds to FK in the cytoplasm, and inhibits calcineurin activation

Explanation

The statement is false because rapamycin is not similar to tacrolimus in inhibiting calcineurin activation. While both rapamycin and tacrolimus are macrolides and bind to FK in the cytoplasm, rapamycin inhibits the mammalian target of rapamycin (mTOR) pathway, while tacrolimus inhibits calcineurin. Therefore, they have different mechanisms of action and do not inhibit calcineurin activation in the same way.

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20. The inhibition of mTOR by rapamycin has which downstream effect? Pick the most correct statement

Explanation

Does not proceed to S phase > Cell Cycle blocked > apoptosis may occur

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21. Nephrotoxicity associated with tac is equal to or worse than cyclosporine

Explanation

The statement is false because nephrotoxicity associated with tac (tacrolimus) is actually less than cyclosporine. Nephrotoxicity refers to the potential for causing damage to the kidneys. Tacrolimus is a medication commonly used in organ transplantation to prevent rejection, and while it can still have some nephrotoxic effects, it is generally considered to be less nephrotoxic compared to cyclosporine, another immunosuppressive drug.

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22. Which is the most correct statement regarding the MOA of fingolimod

Explanation

Fingolimod acts by causing an internalization of G-protein linked receptors on thymocytes/lymphocytes. This means that the drug binds to these receptors and causes them to be taken inside the cells, resulting in a decrease in the number of receptors available on the cell surface. This leads to a reduction in the migration of lymphocytes from lymph nodes into the bloodstream, which helps to decrease inflammation in conditions such as multiple sclerosis. This mechanism of action is well-established and supported by scientific evidence.

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23. Phosphorylated NF-ATc binding with NF-ATn is what normally stimulates the release of IL-2

Explanation

NF-ATc must be dephosphorylated before binding with NF-ATn

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24. CTLA-4 is also known as which of these?

Explanation

CTLA-4 is also known as CD152.

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25. Belatacept should only be given to patients who are seronegative for EBV

Explanation

The statement is false because Belatacept should only be given to patients who are seropositive for EBV, not seronegative. This is because Belatacept can increase the risk of developing EBV-related complications, such as post-transplant lymphoproliferative disorder (PTLD). Therefore, it is important to determine the EBV status of patients before considering Belatacept treatment.

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26. Fingolimod is a prodrug requiring dephosphorylation to work properly

Explanation

Needs to be phosphorylated for activation

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27. Which statement is the most correct regarding cyclosporine and cellular effects?

Explanation

Cyclosporine does not cause lymphocyte death or apoptosis. Cyclosporine is an immunosuppressant drug commonly used in organ transplantation to prevent rejection. It works by inhibiting the activation of T-lymphocytes, which are an important component of the immune system. By suppressing T-cell activation, cyclosporine helps to prevent the immune system from attacking and rejecting the transplanted organ. However, it does not directly cause lymphocyte death or apoptosis.

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28. To prevent hemolytic disease of the newborn in Rh- mothers with Rh+ fetuses, RhoGAM needs to be administered when?

Explanation

RhoGAM needs to be administered within 72 hours of birth of the first child to prevent hemolytic disease of the newborn in Rh- mothers with Rh+ fetuses. This is because during childbirth, there is a possibility of fetal-maternal blood mixing, which can lead to the Rh- mother developing antibodies against the Rh+ blood of the fetus. By administering RhoGAM within 72 hours of birth, the medication can prevent the mother from developing these antibodies and reduce the risk of hemolytic disease in subsequent pregnancies.

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29. The side effects are significant with abatacept and typically prompt discontinuation of the drug

Explanation

The statement suggests that the side effects of abatacept are significant and usually lead to the discontinuation of the drug. However, the correct answer is false, indicating that the statement is incorrect. This implies that the side effects of abatacept may not be significant enough to warrant discontinuation of the drug, or that they can be managed effectively without stopping the medication.

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30. Rarely, tacrolimus is associated with:

Explanation

Tacrolimus, an immunosuppressive drug, is rarely associated with T-cell cancers. T-cell cancers refer to malignancies that arise from the T-cells of the immune system. These cancers can include T-cell lymphomas or leukemias. While tacrolimus is generally effective in preventing organ transplant rejection, it can also suppress the immune system, potentially leading to the development of T-cell cancers in rare cases.

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31. CTLA-4 indiscriminately blocks the process of T-cell activation

Explanation

Stated as a "selective blocking"

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32. Which of these are adverse events associated with fingolimod (per Dr. Khan's slides)? Select all that apply.

Explanation

Fingolimod is an immunosuppressant medication used to treat multiple sclerosis. According to Dr. Khan's slides, adverse events associated with fingolimod include fatal infection, bradycardia, and hemorrhage. Fatal infection can occur due to the medication's immunosuppressive effects. Bradycardia refers to a slow heart rate, which can be a side effect of fingolimod. Hemorrhage, or excessive bleeding, is another potential adverse event. Tachycardia, DIC (disseminated intravascular coagulation), and hypercapnia (elevated carbon dioxide levels in the blood) are not listed as adverse events associated with fingolimod.

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33. Select the correct use(s) of abatacept

Explanation

Should never be used with kineret

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34. Select the correct statement(s) regarding rapamycin:

Explanation

Rapamycin may be used with cyclosporine in certain cases, as they have similar drug-drug interactions (DDIs). Additionally, rapamycin does not pose a significant risk of nephrotoxicity. However, it is not used in B-cell lymphoma.

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35. Which of these are toxicities associated with cyclosporine? [Select all that apply]

Explanation

Cyclosporine can increase transaminase and bilirubin levels, and can cause hirsutism

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36. Everolimus is indicated for which of the following according to Dr. Khan's slides? Select all that apply

Explanation

Everolimus is indicated for the treatment of cardiac allograft vasculopathy, post-transplant lymphoproliferative disorders, breast cancers, treatment of heart failure, and treatment of multiple sclerosis (MS). It is not indicated for the treatment of cardiac autograft vasculopathy, post-transplant lymphosuppressive disorders, or Parkinson's Disease.

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The cyclosporine-cyclophilin complex serves as an inhibitor on what...
Belatacept is a drug generated by recombinant DNA technology, by...
Tacrolimus is roughly 50-100x more potent than cyclosporine
Belatacept is associated with B-cell cancers in the CNS (e.g. PTLD),...
Rapamycin inhibits IL-2 receptor dependent cell cycling
Match the drug interactions with cyclosporine:
Cyclosporine is poorly orally bioavailable, with an oral F of 20-50%.
Cyclosporine metabolism primarily takes place how?
Because rapamycin is associated with _____________, it should be...
Tacrolimus is a macrolide antibiotic
Abatacept and belatacept differ by only _____ amino acids. (Use only...
The MOA of tacrolimus is identical to cyclosporine, with no deviations
What step of the MOA of tacrolimus is different from cyclosporine?
Everolimus is similar to rapamycin except that it is used after tissue...
Which of the following transplant types is belatacept approved for?
Tacrolimus is less orally bioavailable than cyclosporine
Cyclosporine is used for heart, kidney, and lung transplants, as well...
Which statement is incorrect regarding cyclosporine?
Rapamycin is similar to tacrolimus in that it is a macrolide, binds to...
The inhibition of mTOR by rapamycin has which downstream effect? Pick...
Nephrotoxicity associated with tac is equal to or worse than...
Which is the most correct statement regarding the MOA of fingolimod
Phosphorylated NF-ATc binding with NF-ATn is what normally stimulates...
CTLA-4 is also known as which of these?
Belatacept should only be given to patients who are seronegative for...
Fingolimod is a prodrug requiring dephosphorylation to work properly
Which statement is the most correct regarding cyclosporine and...
To prevent hemolytic disease of the newborn in Rh- mothers with Rh+...
The side effects are significant with abatacept and typically prompt...
Rarely, tacrolimus is associated with:
CTLA-4 indiscriminately blocks the process of T-cell activation
Which of these are adverse events associated with fingolimod (per Dr....
Select the correct use(s) of abatacept
Select the correct statement(s) regarding rapamycin:
Which of these are toxicities associated with cyclosporine?...
Everolimus is indicated for which of the following according to Dr....
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