chemistry

NAMI-A

NAMI-A is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand NAMI-A rather than just read about it. In short: NAMI-A is the imidazolium salt of the coordination complex [RuCl4(dmso)(C3N2H4)]− where dmso is dimethylsulfoxide and C3N2H4 is imidazole. Together with KP1019 and BOLD-100, NAMI-A has been investigated as an anticancer agent.

Key takeaways

NAMI-A belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NAMI-A to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NAMI-A from memory before moving on to harder problems.

Reference excerpt

NAMI-A is the imidazolium salt of the coordination complex [RuCl4(dmso)(C3N2H4)]− where dmso is dimethylsulfoxide and C3N2H4 is imidazole. Together with KP1019 and BOLD-100, NAMI-A has been investigated as an anticancer agent.

Reactions NAMI-A is considered a pro-drug formulation that becomes active upon hydrolysis. At pH 7.4, a chloride is replaced by water giving a charge-neutral aquo complex. At lower pH, imidazole is cleaved and replaced with water.

Unlike cisplatin, a platinum based drug, NAMI-A affects metastasis. Whereas platinum compounds can be highly cytotoxic, NAMI-A is much less so.

Preclinical trials Several preclinical trials were conducted in various model systems. In 2002, a study published by Vacca et al. showed that endothelial cells incubated with NAMI-A, were not able to proliferate but that NAMI-A did not kill the cells that were already grown. One trial was done to test the efficacy of NAMI-A in female grafted with MCa mammary carcinoma cells. It was determined that, NAMI-A showed very little toxicity yet managed to decrease the rate of metastasis. Perhaps most impressively is that, though NAMI-A is very sensitive to the environment, it is able to be effective over a range of conditions.

Clinical trials Clinical trials were conducted at the Netherlands Cancer Institute (NKI).

Phase I – monotherapy Phase I trials were conducted on NAMI-A in patients with varying solid tumors 3 hrs a day, 5 days a week, for 3 weeks at varying doses. Drug was given intravenously with and without a port-a-cath. Several side effects were observed including:

Mild hematologic toxicity - blood related toxicity Nausea Vomiting Diarrhea Stomatitis – inflammation of mouth and lips Fatigue Creatinine increase – common toxicity (CTC) grade 1 and 2 - High levels indicate kidney dysfunction Fever Sensitivity reactions to drug Phlebitis at injection site Blisters on hands and feet Of the 24 patients in the study, 20 were evaluated for final results. At the end of the study, 19 of the 20 showed disease progression while 1 patient showed no progression. Due to these results, Phase II trials, using NAMI-A as a solo drug, were not pursued.

Phase I and II – combination therapy with gemcitabine Due to negative results of the stand-alone Phase I trial, and knowledge that NAMI-A slows down progression of metastasis, and not growth of the initial tumor, Phase I & II trials were done using gemcitabine, a nucleoside analog that has shown to be successful in treating lung cancer.

Phase I trial Phase I trials were done to determine the optimal and maximum tolerated dose (MTD)of NAMI-A as well as determining the pharmacokinetics of NAMI-A and gemcitabine administered jointly. This was accomplished by a dose escalation study. The minimal dosage was 300 mg/m2 on a 28-day schedule and the max dosage was 600 mg/m2 administered on a 21-day schedule. 32 patients were enrolled in the study all of which had a form of non-small cell lung cancer (NSCLC), a median age of 57, most diagnosed as level III & IV of disease progression.

Phase II trial Phase II trials were done to evaluate how NAMI-A in combination with gemcitabine impact cancer progression. 19 patients were added in addition to those from the phase I trial. Of the 27 patients evaluated for final results -15 showed anti-tumor activity, 10 showed stable disease progression for 6–10 weeks, and 1 patient exhibited a partial remission (PR) on the 300 mg/m2 for 21 days. The patient who was observed to have a partial remission, occurred during the dose escalation phase I trial. In order to expand the trial, there needed to be at least one patient in the phase II trial that showed PR as the best response. Unfortunately, this did not occur. In addition, it was found that the results of NAMI-A in combination with gemcitabine, did not show improved results from studies done with gemcitabine alone. Due to these results, clinical trials were terminated.

Nomenclature Contrary to what can be found in some papers, the nickname NAMI is not the acronym of “New Anticancer Metastasis Inhibitor”, but has a much more prosaic origin. It was created by a student as a short-form name of the chemical formula of the complex: “NA” comes from the symbol for sodium and “MI” from the word imidazole. The corresponding imidazolium salt was simply called NAMI-A to signify that it was an upgraded version of the prototype NAMI".

References

External links NAMI-A

Illustrations

Worked examples

Example 1 — a first encounter with NAMI-A

Start with the simplest possible case. Write down what NAMI-A claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to NAMI-A before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about NAMI-A ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of NAMI-A

In research: NAMI-A appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses NAMI-A in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: NAMI-A is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chloro complexes, DNA-binding substances, Drugs not assigned an ATC code, so understanding it makes those chapters shorter.
In everyday life: Look for NAMI-A outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study NAMI-A in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NAMI-A means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain NAMI-A out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NAMI-A in simple terms?

Why does NAMI-A matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study NAMI-A?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on NAMI-A.