Expert opinion on drug discovery
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Expert Opin Drug Discov · Sep 2013
ReviewThe preclinical profile of crizotinib for the treatment of non-small-cell lung cancer and other neoplastic disorders.
The critical role of the activity of the nucleophosmin- anaplastic lymphoma kinase (NPM-ALK) fusion protein in anaplastic large-cell lymphoma prompted drug discovery programs directed against ALK. Drug discovery efforts increased after finding that about 4% of non-small-cell lung cancers (NSCLCs) possess an EML4-ALK fusion protein. ⋯ Studies of patients with EML4-ALK-positive NSCLC showed that crizotinib was clinically effective and led to its approval in August 2011. The use of lipophilic efficiency played a crucial role in the development of crizotinib from a lead c-Met inhibitor. The use of X-ray crystal structures from lead compounds, bound to their targets, is increasing in the drug discovery process owing to its effectiveness. That the drug also inhibits ALK and ALK-fusion proteins was serendipitous, however. The discovery of the EML4-ALK fusion protein in some NSCLC patients has led to the testing and rapid approval of the compound.
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Expert Opin Drug Discov · Jun 2012
EditorialProductive university, industry, and government relationships in preclinical drug discovery and development: considerations toward a synergistic lingua franca.
Efficiency and productivity shortfalls conspire with subpar economic return to stigmatize the pharmaceutical industry and jeopardize its viability. This complex and costly innovation-to-commercialization failure, the formidable associated costs, and the relevance of various core competencies endemic to universities, the pharmaceutical industry, and government have been major drivers for establishing preclinical drug-discovery alliances involving these constituencies. ⋯ Based on decades of research and development (R&D) and business experience spanning international big-pharma, biotechnology, and academic spheres, the author opines that a synergistic lingua franca is required among involved constituencies in order for such cross-sector discovery alliances to emerge as robust drug-discovery engines fueled by joint intellectual effort. Technology-transfer professionals, postdoctoral trainees, and consultants are discussed as resources for helping establish the university-industry-government triumvirate as a normative innovation network for preclinical drug discovery and development in the 21st century.
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Expert Opin Drug Discov · Jan 2012
ReviewAdvances in the identification of γ-secretase inhibitors for the treatment of Alzheimer's disease.
In an attempt of altering the natural history of Alzheimer's disease (AD), several compounds have been developed with the aim of inhibiting γ-secretase, the enzymatic complex generating β-amyloid (Aβ) peptides (Aβ(1 - 40) and Aβ(1 - 42)), from amyloid precursor protein (APP). APP is believed to be involved in the pathophysiological cascade of AD. ⋯ Studies in both transgenic and non-transgenic animal models of AD have indicated that γ-secretase inhibitors, administered by the oral route, are able to lower brain Aβ concentrations. However, scanty data are available on the effects of these compounds on brain Aβ deposition after prolonged administration. γ-Secretase inhibitors may cause significant toxicity in experimental animals and in humans believed to be associated with the inhibition of the cleavage of Notch, a transmembrane receptor involved in regulating cell-fate decisions. Unfortunately, two large Phase III clinical trials of semagacestat in mild-to-moderate AD patients were prematurely interrupted because of the observation of a detrimental cognitive and functional effects of the drug, possibly due to its lack of selectivity on APP processing. New APP-selective γ-secretase inhibitors are being developed with the hope of overcoming the previous setbacks.
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Expert Opin Drug Discov · Dec 2009
A review of in vitro and in vivo models of oesophageal and gastric cancer.
Oesophageal and gastric cancers are leading causes of cancer-related mortality. In the era of targeted therapy and individualized treatment strategies, novel treatments for upper-gastrointestinal cancers are only just emerging compared to significant advances in other solid tumour types such as colorectal, breast and lung cancers. Clinical trials are investigating the value of established targeted agents for the treatment of oesophageal and gastric malignancies; however none are used in routine clinical practice. ⋯ The lack of appropriate models for drug development in oesophageal and gastric cancers has hindered the progress of targeted therapy in this field.
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Expert Opin Drug Discov · Mar 2009
Activated protein C in the treatment of acute lung injury and acute respiratory distress syndrome.
Acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) frequently necessitate mechanical ventilation in the intensive care unit. The syndromes have a high mortality rate and there is at present no treatment specifically directed at the underlying pathogenesis. Central in the pathophysiology of ALI/ARDS is alveolocapillary inflammation leading to permeability edema. As a result of the crosstalk between inflammation and coagulation, activation of proinflammatory and procoagulant/antifibrinolytic pathways contributes to disruption of the endothelial barrier. Protein C (PC) plays a central role in maintaining the equilibrium between coagulation and inflammation. Additionally, natural anticoagulants, such as PC, are depleted, both in blood as well as in the lung. Therefore, the PC system is of interest as a therapeutic target in patients with ALI/ARDS. ⋯ It discusses the potential role of activated PC in modulating the proinflammatory/procoagulant state for enhancing endothelial barrier function in animal models and human ALI/ARDS.