IMMUNOSUPPERESSANTS - THE PHARMACOLOGY OF IMMUNOSUPPRESENTS | PHARMACIST REVIEW

 
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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

Immunosuppressant Drugs: A Complete Overview -

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

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Sirolimus=Sirolimus-stents into cardio due to Anti-Proliferative action

MOA=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

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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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