IMMUNOSUPPERESSANTS - THE PHARMACOLOGY OF IMMUNOSUPPRESENTS | PHARMACIST REVIEW
Immune activation 3 signal model
Signal 1 =Antigen at APC(Antigen presenting Surface) react with T-Cell at CD3 receptor
Signal 2=CD80 & CD86 at APC engage with CD28 at T-Cell
Signal 1 & Signal 2 activate Calcium-Calcineurin Pathway, production of Cytokine i.e IL-2, IL-15, CD154, CD25.
Signal 3=IL-2 bind with CD25 at T-Cell activate mTOR (Mammalian Target of Rapamycin) , stimulate T-Cell proliferation
Selective Inhibitor of Cytokine
Cyclosporine=11 Amino acid polypeptide...
MOA= Bind to Cyclophilin(Immunophilin)...this complex bind to Calcineurin...ΘNFATc (Cytosolic Nuclear Factor of Activated T-Cell) dephosphorylation...block activation of NFATc...NFATc not enter the Nucleus & stimulate Production of IL-2...↓IL-2 ↓T-cell proliferation
T.E= prevent Rejection of Kidney, Liver, Cardiac transplant
S.E=Nephrotoxic, CMV infection, Gum Hyperplasia, Hirsutism (↑hairgrowth in women), ↑K+....Contra in Seizure
Tacrolimus=called FK506, Macrolide ...obtain from Fungus
MOA= same to cyclosporine but it Bind to FKBP-12(FK-binding protein) instead of
Cyclophilin
S.E=Nephrotoxicity, Neurotoxiciity, Hirsutism, Gingival hyperplasia, Diabetes
Sirolimus=Sirolimus-stents into cardio due to Anti-Proliferative actionMOA=bind to FK-binding Protein...complex bind to Mtor...interfere with Signal 3.. Block
T-Cell proliferation from G1-S phase
S.E=Hyperlipidemia, Impair wound healing, Nephrotoxic....57-62hr half life
Everolimus=Sec-line agent in Renal cell carcinoma in 2009...Mechanism same to sirolimus
S.E=Hyperlipideia, Impair wound healing, Angioedema
IMMUNOSUPPERESSIVE ANTIMETABOLITES
Azathioprine : Prodrug...converted into 6-MP...then TIMP...Θde novo Purine synthesis
Mycophenolate Mofetil : Reversible, non-copmetitive blocker of IMP....ΘXPM(Xanthine
Monophosphate)...ΘGMP formation
S.E= Leukopenia, Anemia, CMV infection
ANTIBODIES
Polyclonal Antibody : effective against a no. of Lymphocyte antigen
Monoclonal Antibody : effective against specific antigen
Muro : antibody from Mouse
“Zu”: Humanized antibody 90% Human, 10% Mouse
“Xi” : Chimerized antibody, 75% Human, 25% Mouse
Anti-Thymocytes Globilin : Thymocytes develop in Thymus, act as T-Cell precursor...
“Polyclonal antibody”...Act by Coplement-mediated destruction, Apoptosis, Opsonization Antibody-dependent cytotoxiciity
S.E=Lymphopenia, chill, fever, Thrombocytopenia
Muromonab : bind to CD3 receptor...block T-Cell synthesis...used in Renal carcinoma
IL-2 Receptor Antagonist= (Basiliximab & Daclizumab) Anti- CD25...Blocker of IL-2
Alemtuzumab : block CD52 receptor
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