Step-by-Step Guide to Reliable Quantitative Western Blot Data

How to Achieve Quantitative Western Blot Data: a Step-by-Step Guide

Monday, 27 April, 2020


guide to quantitative Western blot data,western blot analysis,reproducibility

A Systematic Approach to Quantitative Western Blot Analysis

The recent paper “A systematic approach to quantitative Western blot analysis” by Lakshmi Pillai-Kastoori, Amy Schutz-Geschwender, and Jeff Harford is the ideal resource for researchers who use Western blotting techniques in their lab and want reliable, robust data. It carefully walks you through each core concept of a Western blot, then thoroughly describes a systematic approach for achieving quantitative data in your own lab.

Original data examples and publication guidelines for each step are also provided and explained, ensuring you are fully prepared before submitting your research. Refer to this guide as you work through your experimental design and analysis. Not only will you have more confidence in your data, but it will help to ensure that you are in alignment with best practices.

Quantitative analysis Western blot data

This systematic guide helps you understand the most critical aspects in getting accurate, precise results. Take an in-depth look at the core concepts of Western blots—including linear range, housekeeping proteins (HKPs), and proper normalization techniques. Empirical calculations of the amount of protein to load onto a gel are highly important: ensuring this amount is within the linear range can help to ensure that your quantitation is accurate.

You can also use an HKP, or single endogenous reference protein, as an internal loading control (ILC), but you must validate it first. This makes sure that you have no variability in HKP expression that can introduce error into your analysis. Additionally, learn how to use normalization techniques to correct for unavoidable and small variations, such as sample concentration or cell number. By establishing a solid foundation and deep comprehension of these concepts, sources of error in your experimentation become minimal. Consequently, this guide can help enhance your data reproducibility and increase the likelihood of publication.

In addition to core concepts, you can follow the paper’s systematic approach to help you get reliable data. This valuable resource explains the importance of validating primary antibodies and ILCs, post-translationally modified (PTM) proteins, and the linear range of detection. This guide also emphasizes that replicating your results is extremely important: it confirms that there is reproducibility or actual differences between samples—not experimental variability. Paired with original data examples, these easy-to-follow steps can guide your Western blotting protocol for useful quantitative results.

Combined Linear Range (CLR) detection of Total protein extract and OCT-4 in HEK293T cells. 4-fold dilution of cell extracts from HEK293T untreated control (a’-a”) as well as knockdown HEK293T (experimental) (b-b”) category were loaded onto 10% Bis-Tris gel (NP0303BOX) and run under the MOPS buffer system. All the blots were incubated with Revert 700 Total Protein Stain (LI-COR P/N 926-11010) to visualize total protein extract in each lane. Subsequently, the blots were incubated in Intercept Blocking Buffer for one hour at room temperature and thereafter in Anti-Oct-4 antibody (CST #2750; Lot #4) and IRDye 800CW Goat anti-Rabbit IgG (H + L). (a-a”) Individual linear range of detection for total protein and OCT-4 was determined for control cell extracts (a - a”) as well as for experimental cell extracts (b – b”). Combined linear range for total protein extract and OCT-4 protein detection was plotted for both cell extract types (c, d). CLR was identified at 4.5 micrograms for both cell types. Blocking buffer: Intercept Blocking Buffer (TBS); Intercept T20 (TBS) Antibody Diluent; Protein ladder: Chameleon duo ladder (LI-COR P/N 928-70000; Lot# C70803-03). Imager: Odyssey® CLx; resolution: 169 μm; Intensity: auto mode.

Minimize Error and Boost Reproducibility

“A systematic approach to quantitative Western blot analysis” is a step-by-step workflow and the ideal resource for your lab. By helping to minimize error in Western blot methodology, it can guide you toward more precise data. A more unified approach among members of the scientific community can help to mitigate experimental variation and increase overall reproducibility. Download your copy for free today.

This paper also provides you with the latest publication guidelines, so you can meet standards and obtain publishable data. Altogether, it is an essential resource that covers the core concepts in Western blotting and a comprehensive strategy for more accurate, publishable results. Keep the paper on hand to not only enhance your own quantitative data, but to also encourage unified practices, minimize error, and produce publishable data in the global scientific community as a whole.

We're your lab's go-to near-infrared Western blotting experts. If you ever have questions about protocols, quantitation, or normalization techniques, then we encourage you to reach out today. We're always eager to give you and your team the support you deserve.

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