Immuno stimulant

IMMUNO STIMULANT
Done by,
A.Vasantha kumar
B.Pharmacy

IMMUNITY:
 immune system is a biological structures and processes within an organism
that protects against diseases by identifying and killing pathogens and tumor
cells.
 Types of immune response
• Innate immune response
• Adaptive immune response

INNATE IMMUNE RESPONSE:
 First line of defense against an antigenic activity
 Defense like physical (skin)
 Biochemical (complement, lysozyme, interferons)
 Cellular components (neutrophils, monocytes, macrophages)
ADAPTIVE IMMUNE RESPONSE:
 Humoral immunity – antibody production – killing extracellular organisms.
 Cell mediated immunity – cytotoxic / killer T cells – killing virus and tumor
cells.

IMMUNOSUPPRESSIVE DRUGS:
 Those drugs that suppress the immune system.
 Particularly important for transplantation, autoimmune disorders, allergies,
and all the cases where immune system is too active.

IMMUNOSTIMULANT DRUGS:
 Those drugs that stimulate the immune system.
 Particularly important for the treatment of infectious diseases, tumors,
immune deficiencies and all the cases where the immune system needs a
boost.

 Immunotherapy deals with the idea of boosting an individuals immune
system to allow it to destroy microbes and tumors.
 The boost can be biological (microbial – derived products), pharmacological,
or cell – based.
IMMUNOSTIMULANT
DRUGS
MICROBIAL PRODUCTS
AND CYTOKINES
ADOPTIVE CELL
TRANSFER
STRONGER IMMUNE SYSTEM
&
STRONGER DEFENSES

IMMUNOSTIMULANT DRUGS – MICROBIAL PRODUCTS:
 Many bacterial products are PAMPs (Pathogen Associated Molecular
Patterns) and they strongly stimulate inflammation by triggering cytokine
production in APCs. These in turn, stimulate the adaptive immunity and
overall, increase leukocytes number by boosting hematopoiesis.
 The BCG is an attenuated (less virulent, but still alive) mycobacterium
bovis strain.
 This is able to infect human cells, but not to induce any pathology. Rather,
it can stimulate the production of Ig by B-cell and thus behave as a
vaccine against mycobacterium tuberculosis.

 It has a strong inflammatory effects on some tissues and has thus been also
approved as a treatment for bladder cancer.
 The side effect is that pathogen associated molecular patterns can induces
massive cytokine production, which can result in fever and shock. This is
especially true with cytokines, which can also have direct toxic effects.

IMMUNOTHERAPY – Cytokine Therapies
 Since cytokines control the whole immune system, and mostly stimulate it. It
is logical to use them whenever there is the need to boost immune system
activity.
 They are used in clinical practice, but they are burdened by severe side
effects.

ACTIVE VACCINATION:
 Active vaccination is the process of injecting individuals with microbial
antigens, heat – killed microbes to induce antibody production and memory
B-cells formation.
 The individual acquires the ability to respond to the microbe he/she has been
vaccinated against.
 To ensure memory B-cells formation, whole microbes (either killed or
attenuated) are preferred, as they also trigger fever and inflammation that
boost B-cells activation and memory cells formation.

 Attenuated microbes are those living strains which are still able to infect an
individual, but that generate a less-dangerous pathological manifestation,
which is generally inflammation/ flu.
 Side effect are generally low, but sometimes they can be extremely severe.

PASSIVE VACCINATION
 In passive vaccination, individuals are injected with preformed
immunoglobulins (from donors). Thus, individuals acquire pools of
immunoglobulins (good for immunodeficiencies) and the ability to respond
certain microbes.
 Transfusion of immunoglobulins is called intravenous immunoglobulins.
Generally, it contains Ig G and Ig A.
 anti-microbial immunoglobulin are used against hepatitis B, botulism,
diphtheria, tetanus, rabies.
 It’s generally well-tolerated, but sporadic side effects can be extremely severe.

ADJUVANTS USED FOR VACCINATION
 Injecting a living microbe can be dangerous, and reducing the amount of
microbe to the minimum is mandatory. Here’s the need for adjuvants.
 Adjuvants are chemical or biological products that can either boost T-cells,
activate inflammation or help to stabilize the antigen so that it can stimulate
B-cells for a longer time.
 Adjuvants have been also implicated in clinical side effects of vaccinations,
like the onset of juvenile diabetes in the case of Freund’s adjuvants.
 Most commonly used adjuvants (in U.S.) are slats of aluminum (aluminum
hydroxy phosphate sulfate(AAHS), aluminum hydroxide, aluminum
phosphate), monophosphoryl lipid A + aluminum salt, oil in water emulsion
composed of squalene, etc.,

ADOPTIVE CELL TRANSFER
 Adoptive cell transfer deals with the idea of isolating immune cells from
individuals, expand them in culture and then re-infuse them. This is a
wonderful strategy to kill tumors.
 Tumor-infiltrated lymphocytes (TIL) are a heterogeneous population which
includes cytotoxic T-lymphocytes able to recognize and kill the tumor. The
problem is that the cytokines released from the tumor suppress them.
 Taking these “good cells” out of the tumor mass and re-injecting them upon
expansion strongly increases the ability of the immune system to react
against tumors.

CELL- BASED VACCINATION
 Dendritic cells can be “prepared” in vitro to show tumor antigens, and then
re-injected into the patient to stimulate tumor antigens recognition and
tumor killing. This is currently defined as cell – based vaccination.

IMMUNOSTIMULANT USES
 Immunodeficiency disorder
 Chronic infections
 Cancer

Bacillus Calmette – Guerin (BCG) Vaccination
 Live, attenuated culture of BCG strain of Mycobacterium Bovis .
MODE OF ACTION
 Immunization: The Mycobacterium bovis strain in the vaccine stimulates
Mycobacterium tuberculosis infection and produces cell – mediated
immunity.
 Immunostimulation: In bladder cancer, intravesicularly administered
vaccine stimulates a local, chronic inflammatory response involving
macrophages and leukocytes infiltration of the bladder that leads to
destruction of superficial tumor cells of the urothelium. This stimulates the
host’s immune system to reject the tumor.

THERAPEUTIC USES
 Treatment and of carcinoma of the urinary bladder, prophylaxis of
primary and recurrent stage of papillary tumors after transurethral
resection.
 This vaccine is used to prevent tuberculosis (TB) in people who have not
been infected with the disease.
ADVERSE EFFECTS
 Hypersensitivity,
 Shock,
 Chills,

LEVAMISOLE / ERGAMISOL
 Synthesized originally as an anthelmintic but appears to restore depressed
immune function of B – lymphocytes, T – lymphocytes, monocytes and
macrophages.
MODE OF ACTION
 Levamisole appears to restore depressed immune function rather than
stimulates response to above – normal levels. Levamisole also stimulates the
formation of antibodies to various antigens; enhances T – cell responses by
stimulating T – cell activation and proliferation; potentiates monocyte and
macrophage functions, including phagocytosis and chemotaxis; and
increase neutrophil mobility, adherence, and chemotaxis.

THERAPEUTIC USES
 Adjuvants therapy with 5 – fluorouracil colon cancer, agranulocytosis.
 It is used to treat immunodeficiency associated with Hodgkin’s disease.
ADVERSE EFFECTS
 Flu – like symptoms,
 Allergic manifestation,
 nausea and muscle pain.

THALIDOMIDE
MODE OF ACTION
 Enhanced T-cell production of cytokines – IL-2, IFN-γ
 Natural killer cell-mediated cytotoxicity against tumor cells. Decrease
circulating TNF-α in patients with erythema nodosum leprosum, but
increase in HIV – seropositive patients, if affects angiogenesis also.
THERAPEUTIC USES
 Severe refractory rheumatoid arthritis,
 Multiple myeloma.
ADVERSE EFFECT
 Teratogenicity

RECOMBINANT CYTOKINES
 Hormones like, small low molecular weight polypeptides.
 Maintain communication among cells to co-ordinate immune response.
 Act synergistically or antagonistically thereby enhancing or suppressing their
own production.
 Autocrine, paracrine or endocrine in action.
 Causes tissue repair and provide resistance to infection.

Cytokines – based therapies in clinical use:

ISOPRINOSINE (Inosiplex)
 Complex of the pacetamidobenzoate salt of N,N-dimethylamino-2-
propanol; inosine in 3:1 molar ratio
MODE OF ACTION
 Augment production of cytokines such as IL-1, IL-2 and IFN-γ, increases
proliferation of lymphocytes in response to mitogenic or antigenic stimuli,
increase active T-cell rosette and induces T-cell surface markers on
prothymocytes.

THERAPEUTIC USES
 Herpes simplex infections,
 subacute sclerosing panencephalitis,
 Acute viral encephalitis caused by herpes simplex,
 Epstein-Barr and measles.
ADVERSE EFFECTS
 Minor CNS depressant,
 Transient nausea,
 Rise of uric acid in serum and urine.

IMMUNOCYNIN
 Stable form of haemocynin, a non-haeme, oxygen carrying, copper-
containing protein found in arthropods and molluses
THERAPEUTIC USES
 Urinary bladder cancer.
ADVERSE EFFECT
 Rare-mild fever.

IMMUNIZATION
 Immunization is a process whereby a person is made immune or resistant to
an infectious disease, typically by the administration of a vaccine. Vaccines
stimulate the body’s own immune system to protect the person against
subsequent infection or disease.
 Active immunization – stimulation an antigen
 Passive immunization – preformed antibody

VACCINES
 Administration of antigen as a whole, killed organism, or a specific
protein or peptide constituents of an organism.
 A substance used to stimulate the production of antibodies and provide
immunity against one or several infectious diseases.
 Anticancer vaccines:
vaccinating patients with autologous antigen presenting cells (APC)
expressing tumor-associated antigens(TAA).
cancer vaccine is a vaccine that either treat existing cancer or
prevents development of cancer. Vaccines that treat existing cancer are
known as therapeutic cancer vaccines.

IMMUNOGLOBULIN
 Ig are human gamma-globulin that carry the antibodies – like normal
human gamma-globulin, tetanus Ig, rabies Ig, anti-diphtheria Ig and
hepatitis – B Ig. Allergic reactions including serum sickness and anaphylaxis
can occur with antisera, while it is uncommon with Igs.
 Mode of action: Ig not only involve the blockade of Fc receptors of
phagocytes, but also control complement pathways, idiotype-anti-idiotype
dimer formation, blockage of superantigen binding to T-cells, inhibition of
dendritic cells and stimulation of regulatory T-cells
INDICATIONS:
 individual is deficient in antibodies – immunodeficiency.
 Individual is exposed to an agent, inadequate time for active immunization.

 Rabies
 Hepatitis B
 Nonspecific immunoglobulins
 Antibody – deficiency disorders
 Specific immune globulins
 High titers of desired antibody
 Hepatitis B, rabies, tetanus

Immuno stimulant

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Immuno stimulant