Intravenous immunoglobulin (IVIG) is a blood product administered
intravenously. It contains the pooled IgG immunoglobulins( antibodiesextracted from the plasma of over a thousand blood donors). IVIG's effects last between 2 weeks and 3 months. It is mainly used as treatment in three major categories:
* Immune deficiencies - Immune deficiencies such as
X-linked agammaglobulinemia, hypogammaglobulinemia(primary immune deficiencies), and acquired compromised immunity conditions ( [secondary immune deficiencies), featuring low antibodylevels.
* Inflammatory and autoimmune diseases.
* Acute infections.
Mechanism of action
IVIG is given as a plasma protein replacement therapy (IgG) for immune deficient patients which have decreased or abolished
antibodyproduction capabilities. In these immune deficient patients, IVIG is administered to maintain adequate antibodieslevels to prevent infections and confers a passive immunity. Treatment is given every 3-4 weeks. In the case of patients with autoimmune disease, IVIG is administered at a high dose (generally 1-2 grams IVIG per kg body weight) to attempt to decrease the severity of the autoimmune disease.
The precise mechanism by which IVIG suppresses harmful
inflammationhas not been definitively established but is believed to involve the inhibitory Fc receptor. [cite journal |author=Gern JE |title=Antiinflammatory Activity of IVIG Mediated through the Inhibitory FC Receptor |journal=PEDIATRICS |volume=110 |issue=2 |pages=467–8 |month=Aug |year=2002 |url=http://pediatrics.aappublications.org/cgi/content/full/110/2/S1/467-b] [cite journal |author=Nimmerjahn F, Ravetch JV |title=The antiinflammatory activity of IgG: the intravenous IgG paradox |journal=J. Exp. Med. |volume=204 |issue=1 |pages=11–5 |year=2007 |month=Jan |pmid=17227911 |pmc=2118416 |doi=10.1084/jem.20061788 |url=] The actual primary target(s) of IVIG in autoimmune disease are still unclear, however. IVIG may work via a multi-step model where the injected IVIG first forms a type of immune complex in the patient. [cite journal |author=Clynes R |title=Immune complexes as therapy for autoimmunity |journal=J. Clin. Invest. |volume=115 |issue=1 |pages=25–7 |year=2005 |month=Jan |pmid=15630438 |pmc=539209 |doi=10.1172/JCI23994 |url=] Once these immune complexes are formed, they interact with activating Fc receptors on dendritic cells [cite journal |author=Siragam V, Crow AR, Brinc D, Song S, Freedman J, Lazarus AH |title=Intravenous immunoglobulin ameliorates ITP via activating Fc gamma receptors on dendritic cells |journal=Nat. Med. |volume=12 |issue=6 |pages=688–92 |year=2006 |month=Jun |pmid=16715090 |doi=10.1038/nm1416 |url=] which then mediate anti-inflammatory effects helping to reduce the severity of the autoimmune disease or inflammatory state.
Additionally, the donor antibody may bind directly with the abnormal host antibody, stimulating its removal. Alternatively, the massive quantity of
antibodymay stimulate the host's complement system, leading to enhanced removal of all antibodies, including the harmful ones. IVIG also blocks the antibody receptors on immune cells ( macrophages), leading to decreased damage by these cells, or regulation of macrophage phagocytosis.
IVIG may also regulate the immune response by reacting with a number of membrane receptors on
T cells, B cells, and monocytesthat are pertinent to autoreactivity and induction of tolerance to self. [cite journal |author=Bayry J, Thirion M, Misra N, "et al" |title=Mechanisms of action of intravenous immunoglobulin in autoimmune and inflammatory diseases |journal=Neurol. Sci. |volume=24 Suppl 4 |issue= |pages=S217–21 |year=2003 |month=Oct |pmid=14598046 |doi=10.1007/s10072-003-0081-7 |url=]
A recent report stated that IVIG application to activated
T cellsleads to their decreased ability to engage microglia. As a result of IVIG treatment of T cells, the findings showed reduced levels of tumor necrosis factor-alphaand interleukin-10in T cell-microglia co-culture. The results add to the understanding of how IVIG may affect inflammation of the central nervous system in autoimmune inflammatory diseases. [cite journal |author=Janke AD, Yong VW |title=Impact of IVIg on the interaction between activated T cells and microglia |journal=Neurol. Res. |volume=28 |issue=3 |pages=270–4 |year=2006 |month=Apr |pmid=16687052 |doi=10.1179/016164106X98143 |url=]
IVIG is useful in some acute infection cases such as in
Kawasaki's Diseaseand pediatric HIVinfection.
* IVIG is an infusion of IgG antibodies only. Therefore, peripheral tissues that are defended mainly by
IgAantibodies, such as the eyes, lungs, gut and urinary tractare not fully protected by the IVIG treatment.
* XLA patients are immune to the most virulent adverse effect, anaphylactic shock, as they do not have the antibodies to react against the treatment. Anaphylactic shock has a higher chance to occur in IgA deficient patients which do have other antibody types.
* In case of recurring side effects, it is recommended to slow the pace of the IVIG administration and to reduce the dosage. It is also advisable to change IVIG brand, as some people react against to a specific brand.
* If the patient is diabetic, he should take into consideration the medium in which the antibodies are solubilized in the IVIG treatment, as some brand solubilize antibodies with high concentrated
sugars (such as sucroseand maltose).
FDAguidelines for IVIG state the product should be:
** Prepared out of at least 1,000 different human donors.
** All four IgG subgroups (1-4) should be present.
** The IgG should maintain biological activity and lifetime of at least 21 days.
** Does not contain samples which are
HIV, hepatitis B, hepatitis Cpositive.
** Screened and treated in a manner that destroys
* IVIG is also considered a modulator of the
immune systemand was shown to be beneficial in treating numerous autoimmunediseases such as relapsing and remitting multiple sclerosis(MS), myasthenia gravis, pemphigus, polymyositis(PM), dermatomyositis(DM), Wegener's granulomatosis(WG), Churg-Strauss syndrome, chronic inflammatory demyelinating polyneuropathy(CIDP) and more.
* IVIG can be given to pregnant women.
* IVIG is also used as a treatment for unexplained recurring miscarriages. The effectiveness of the therapy is controversial.
*IVIG cost is climbing and well over $50/g. ($10,000 for a 220lbs person at 2g/kg)
Uses of IVIG
Dosage of IVIG is dependent on indication.
For primary immune dysfunction 100 to 400 mg/kg of body weight every 3 to 4 weeks is implemented.
For neurological and autoimmune diseases 2 grams per kilogram of body weight is implemented for three to six months over a five day course once a month. Then maintenance therapy of 100 to 400 mg/kg of body weight every 3 to 4 weeks follows.
* Allogeneic bone marrow transplant
Chronic lymphocytic leukemia
Idiopathic thrombocytopenic purpura
* Primary immunodeficiencies
Kidney transplantwith a high antibody recipient or with an ABO incompatible donor
* Common Variable Immune Deficiency
In 2004 the FDA approved the Cedars-Sinai IVIG Protocol which has been 90-95% successful in removing antibodies from the blood of kidney transplant recipients so that they can accept a living donor kidney from any healthy donor no matter blood type (ABO incompatible) or tissue match.
Chronic fatigue syndrome
Chronic inflammatory demyelinating polyneuropathy(CIDP)
* Graves' ophthalmopathy
Inclusion body myositis
* Lambert-Eaton syndrome
Multifocal motor neuropathy
Neonatal alloimmune thrombocytopenia
* Parvovirus B19
Renal transplant rejection
Stiff person syndrome
* Severe sepsis and
septic shockin critically ill adultscite journal |author=Laupland KB, Kirkpatrick AW, Delaney A |title=Polyclonal intravenous immunoglobulin for the treatment of severe sepsis and septic shock in critically ill adults: a systematic review and meta-analysis |journal=Crit. Care Med. |volume=35 |issue=12 |pages=2686–92 |year=2007 |month=Dec |pmid=18074465 |doi= |url=]
Toxic epidermal necrolysis
chronic lymphocytic leukemiaand multiple myeloma, as well as various rare deficiencies of immunoglobulin synthesis (e.g. X-linked agammaglobulinemia, hypogammaglobulinemia), IVIG is administered to maintain adequate immunoglobulin levels to prevent infections.
Complications and side effects
Complications of IVIG therapy include
dermatitis- usually peeling of the skin of the palms and soles
* infection (such as
HIVor viral hepatitis) by contaminated blood product; there is also an as yet unknown risk of contracting variant CJD(vCJD).
pulmonary edemafrom fluid overload, due to the high colloid oncotic pressure of IVIG
* allergic/anaphylactic reactions
* damage such as
hepatitiscaused directly by antibodies contained in the pooled IVIG
acute renal failure
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