Tc99mAnnexin V Detection of Apoptosis
2.6.1. Preparation of Chelator-Annexin-V Human annexin-V produced by expression in Escherichia coli is obtained commercially from Sigma. Annexin-V is derivatized as described previously 123 with hydrozinonicotinamide HYNIC by gently mixing for 3 h at 22 C in the dark a mixture of 5.6 mg mL of annexin-V in 20 mM HEPES pH 7.4 , 100 mM NaCl, and 22 g of 6-HYNIC Anor MED, Langley, British Columbia dissolved in 18.5 L of N,N-dimethyl formamide 42 mM . At the end of the incubation period, the...
The Use of an Enema Formulation of ISIS 2302 in Ulcerative Colitis
The research experience to date with iv ISIS 2302 in ulcerative colitis is limited to two patients, one of whom received placebo. The treated patient had a sustained remission 7 yr after treatment with 13 doses of iv ISIS 2302 0.5 mg kg . Van Deventer et al. reported the largest clinical experience with ISIS 2302 in ulcerative colitis at the United European Gastroenterology Week 2001 . Using a nightly ISIS 2302 enema for 1 mo, they studied patients age gt 18 with active ulcerative colitis...
Pka Gem 231
A number of advanced chemistry modifications have been employed to improve the specificity, pharmacokinetics, and safety profiles of phosphor-othioate oglionucleotide. These so-called mixed-backbone oglionucleotides permit oral and colorectal administration as a result of their increased in vivo metabolic stability. One of these compounds, GEM 231, is designed to interfere with the production of the RIa regulatory subunit of PKA, a cellular growth promoter that is increased within a wide...
Conclusion Fyu
Drug resistance during cancer therapy can occur during exposure to subtoxic concentrations of death-inducing drugs. On the other hand, excessive cytotoxicity is damaging for both tumor and normal cells 13 . In contrast to the permanent drug resistance through constitutive, ectopic overexpression of antiapoptotic genes such as bcl-2 and bcl-xL, which may not be relevant to cellular conditions in naturally occurring tumors, the duration of antisense downregulation by a typical AS-ODN is usually...
Phospholamban Downregulation and Heart Failure
Although antisense per se has not been used to downregulate phospholamban in animal models of heart failure, a similar strategy has been pursued with dominant-negative constructs, with some success. A pseudophos-phorylated mutant of phospholamban was introduced using viral transfer to a hamster model of cardiomyopathy, and progression of heart failure was slowed 35 . The same method has been used to transfect rats with myocardial infarction, and again the deterioration of ventricular structure...
Pharmacokinetic Analysis of Plasma Paclitaxel Levels
The data were evaluated with the assistance of the computer program PKCALC as published previously 66 . The iv plasma data were fit to the following equation 67 In which Cp t is the plasma concentration at time t, A, and B are intercept terms, a is a distribution rate constant, and p is an elimination rate constant. All data are reported as the mean SD, and key parameters are presented in Table 1. Paclixel's pharmacokinetics have been typically modeled with a two-compartment system the drug is...
V
Fig. 2. Antisense DNA red base-paired to mRNA target. plasma and cellular proteins 139 . The known modes of phosphorothioate toxicity invite further modifications to reduce sulfur content in therapeutic oligonucleotides. Encouraging results have recently been obtained suggesting that greater potency and specificity might be possible with 2'-O-alkyl RNA DNA 2'-O-alkyl RNA phosphorothioate chimeras 140,141 , PNA-peptide conjugates 142 , a p a-anomeric DAN chimeras 143,144 , DNA boranophosphates...
PMO Synthesis and Sequences
PMOs were synthesized at AVI BioPharma Corvallis, OR as previously described 62 . Purity was greater than 90 full length, as determined by reverse-phase high-performance liquid chromatography and matrix-assisted laser desorption ionization time-of-flight mass spectroscopy. Lyophilized PMO compounds were dissolved in sterile apyrogenic saline and filtered through 0.2- m Acrodisc filters Gelman . The antisense PMO AVI-4472 is complementary to the AUG translation initiation region of the rat...
ASODN Design
Unmodified DNA oligonucleotides are either poorly taken up or rapidly degraded by serum and cell-associated nucleases. To prevent this, phosphor- othioate oligonucleotides P-ODNs approx 16-18 bases long in which one of the nonbridging oxygen atoms in the nucleotide is replaced with sulfur provide protection from nuclease degradation without significantly interfering with RNase H activity. 2'-Methoxy-ethoxy modifications in the first and last four or five nucleotides flanking the central region,...
Info Hup
4.1. PGMC Delivery Assisted by Diagnostic Ultrasound Based on the aforementioned advantages, 21 pigs received AVI-4217 a pig version of AVI-4126 bound to PGMC, AVI-4217 alone, or no antisense treatment after carotid balloon injury 25 . The vessels were evaluated 30 d postinjury. The results are presented in Table 7. 4.2. PGMC for Site-Specific Delivery of AVI-4217 in Porcine Coronary Vessels The aforementioned results are impressive, so additional studies that did not involve ultrasound for...
Cu64 Chimeras
Using the methods described above, we will prepare Cu-64-PNA-peptides with complementary sequences known to hybridize specifically to mRNAs for activated K-RAS mutated in the twelfth codon, CCND1, HER2, MYC, and mutant tumor suppressor p53, and capable of binding to the receptor for IGF-1. We will test the specificity of uptake and mRNA hybridization of the Cu-64-PNA-peptide probes in normal human epithelial cells vs K-RAS mutant AsPC1 human pancreatic cancer cells and K-RAS wild-type BT474...
Construction of Antisense KrasExpressing Plasmids
Dr. Dusty Miller Fred Hutchinson Cancer Research Center, Seattle, WA generously provided the retroviral vector plasmid LNSX. LNSX contains the selectable neomycin phosphotransferase gene, which is expressed from the retroviral long terminal repeat LTR , and an inserted DNA is placed in the downstream of an internal SV40 early promoter 21 . In this experiment, the LNSX is used as an expression plasmid vector see Note 1 . A K-ras cDNA fragment spanning from nucleotide nt 171 in the first exon to...
Antisense Fundamentals
AS-ODNs are short stretches of 16-18 chemically modified nucleotides designed to hybridize with specific complementary mRNA to block production of proteins encoded by the targeted mRNA transcripts. AS-ODNs use Watson-Crick base pairing to specifically bind to complementary mRNAs. For this binding to occur, the targeted mRNA region must be accessible to the oligonucleotide. In addition, the oligonucleotide must be taken up efficiently by the target cells and must arrive intact to the site of the...
Chemical Penetration Enhancers
A wide variety of chemicals can act as penetration enhancers. The mechanisms by which these chemicals alter delivery are dependent on their chemical class. First, they may act on the drug itself by altering its thermodynamic activity, leading to greater partitioning into the skin. Second, enhancers may interact with the stratum corneum lipids, causing a reduced barrier 32 . Effective enhancers include water, alcohols methanol and ethanol , alkylmethyl sulfoxides, pyrrolidones, laurocapram,...
Phosphorodiamidate Morpholino Oligomers
The studies presented in this chapter utilized phosphorodiamidate morpholino oligomer PMO antisense agents. The chemistry of PMO overcomes some of the major shortcomings of phosphorothioate oligonucleotides see Chapter 13 . The PMO backbone is nonionic at physiological pH and consists of a six-membered morpholine ring instead of a deoxyribose sugar, and the charged phosphodiester internucleoside linkage is replaced by an uncharged phosphorodiamidate linkage 52 . PMOs are highly resistant to...
Info Ine
baseline, and at 24 h, 48 h, 72 h, 1 wk, and 2 wk postdose. Adverse experiences were collected on an ongoing basis from the time of dosing to discharge from the study at follow-up wk 2. The most frequent adverse events reported included lower-extremity aches and headache. The majority of adverse events were graded mild in intensity and were generally self-limiting. Serum complement C3a was measured. Four subjects had elevated C3a greater than twice the upper limit of normal normal 0-400 ng mL ,...
M Ian Phillips PhD dsc
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