What is/are Octreotide?
Octreotide (brand name Sandostatin, Novartis Pharmaceuticals) is an octapeptide that mimics natural somatostatin pharmacologically, though it is a more potent inhibitor of growth hormone, glucagon, and insulin than the natural hormone. It was first synthesized in 1979 by the chemist Wilfried Bauer.
The Food and Drug Administration (FDA) has approved the usage of a salt form of this peptide, octreotide acetate, as an injectable depot formulation for the treatment of acromegaly, gigantism, thyrotropinoma, diarrhea and flushing episodes associated with carcinoid syndrome, and diarrhea in patients with vasoactive intestinal peptide-secreting tumors (VIPomas).
Further information: Octreotide scan
Octreotide is used in nuclear medicine imaging by labelling with indium-111 (Octreoscan) to noninvasively image neuroendocrine and other tumours expressing somatostatin receptors. More recently, it has been radiolabelled with gallium-68, enabling imaging with positron emission tomography (PET), which provides higher resolution and sensitivity.
Octreotide can also be labelled with a variety of radionuclides, such as yttrium-90 or lutetium-177, to enable peptide receptor radionuclide therapy (PRRT) for the treatment of unresectable neuroendocrine tumours.
Off-label and experimental uses
Octreotide has also been used off-label for the treatment of severe, refractory diarrhea from other causes. It is used in toxicology for the treatment of prolonged recurrent hypoglycemia after sulfonylurea and possibly meglitinides overdose. It has also been used with varying degrees of success in infants with nesidioblastosis to help decrease insulin hypersecretion.
Octreotide has been used experimentally to treat obesity, particularly obesity caused by lesions in the hunger and satiety centers of the hypothalamus, a region of the brain central to the regulation of food intake and energy expenditure.The circuit begins with an area of the hypothalamus, the arcuate nucleus, that has outputs to the lateral hypothalamus (LH) and ventromedial hypothalamus (VMH), the brain's feeding and satiety centers, respectively. The VMH is sometimes injured by ongoing treatment for acute lymphoblastic leukemia (ALL) or surgery or radiation to treat posterior cranial fossa tumors. With the VMH disabled and no longer responding to peripheral energy balance signals, "Efferent sympathetic activity drops, resulting in malaise and reduced energy expenditure, and vagal activity increases, resulting in increased insulin secretion and adipogenesis." "VMH dysfunction promotes excessive caloric intake and decreased caloric expenditure, leading to continuous and unrelenting weight gain. Attempts at caloric restriction or pharmacotherapy with adrenergic or serotonergic agents have previously met with little or only brief success in treating this syndrome."In this context, octreotide suppresses the excessive release of insulin and may increase its action, thereby inhibiting excessive adipose storage. In a small clinical trial in eighteen pediatric patients with intractable weight gain following therapy for ALL or brain tumors and other evidence of hypothalamic dysfunction, octreotide reduced body mass index (BMI) and insulin response during glucose tolerance test, while increasing parent-reported physical activity and quality of life (QoL) relative to placebo. In a separate placebo-controlled trial of obese adults without known hypothalamic lesions, obese patients who received long-acting octreotide lost weight and reduced their BMI compared to patients receiving placebo; post hoc analysis suggested greater effects in patients receiving the higher dose of the drug, and among "Caucasian patients having insulin secretion greater than the median of the cohort." "There were no statistically significant changes in QoL scores, body fat, leptin concentration, Beck Depression Inventory, or macronutrient intake", although patients taking octreotide had higher blood glucose after a glucose tolerance test than those receiving placebo.
Octreotide has also been investigated for patients with pain from chronic pancreatitis, and it may be useful in the treatment of thymic neoplasms.
The drug has been used off-label, injected subcutaneously, in the management of hypertrophic pulmonary osteoarthropathy (HPOA) secondary to non-small cell lung carcinoma. Although its mechanism is not known, it appears to reduce the pain associated with HPOA.
It has been used in the treatment of malignant bowel obstruction Octreotide may be used in conjunction with midodrine to partially reverse peripheral vasodilation in the hepatorenal syndrome. By increasing systemic vascular resistance, these drugs reduce shunting and improve renal perfusion, prolonging survival until definitive treatment with liver transplant. Similarly, octreotide can be used to treat refractory chronic hypotension.
While successful treatment has been demonstrated in case reports, larger studies have failed to demonstrate efficacy in treating chylothorax. A small study has shown that octreotide may be effective in the treatment of idiopathic intracranial hypertension.
The most frequent adverse effects (more than 10% of patients) are headache, hypothyroidism, cardiac conduction changes, gastrointestinal reactions (including cramps, nausea/vomiting and diarrhoea or constipation), gallstones, reduction of insulin release, hyperglycemia or hypoglycemia, and (usually transient) injection site reactions. Slow heart rate, skin reactions such as pruritus, hyperbilirubinemia, hypothyroidism, dizziness and dyspnoea are also fairly common (more than 1%). Rare side effects include acute anaphylactic reactions, pancreatitis and hepatitis. One study reported a possible association with rheumatoid arthritis.
Some studies reported alopecia in patients who were treated by octreotide. Rats which were treated by octreotide experienced erectile dysfunction in a 1998 study. A prolonged QT interval has been observed in patients, but it is uncertain whether this is a reaction to the drug or part of the patients' illnesses.
This article uses material from the Wikipedia article Octreotide, which is released under the Creative Commons Attribution-Share-Alike License 3.0.