Human Midkine (MK) ELISA Kit — Product Review & Buying Guide for Cancer Biomarker and Translational Researchers

Midkine: The 13-kDa Heparin-Binding Double Agent

Midkine (MK/MDK) is a 13-kDa heparin-binding growth factor/cytokine with pleiotropic roles in growth, development, and repair[reference:21]. Expressed transiently during embryogenesis and reinduced in adult pathologies like cancer, neurodegeneration, and chronic inflammation, MK's dual role as a pro-survival and pro-angiogenic mediator makes it a critical biomarker and therapeutic target[reference:22]. Elevated MDK levels are frequently associated with aggressive tumor behavior and poor clinical outcomes[reference:23].

The Human Midkine (MK) ELISA Kit (KTE61678) from Abbkine offers a sensitive, specific, and complete solution for quantifying MK in human samples. Here's our detailed review.

What's in the Box?

Everything you need — no additional reagents to purchase.

Advantages

1. Industry-Leading Sensitivity

The kit achieves a limit of detection (LOD) of 0.1 pg/mL — 10× lower than leading competitors — capturing MK in as little as 10 µL of sample[reference:24]. This is critical for detecting physiological MK levels (healthy serum: ~1–5 pg/mL) that generic kits miss entirely.

2. Exceptional Specificity

The kit uses a capture antibody targeting MK's N-terminus and a detection antibody against its C-terminus, ensuring minimal cross-reactivity with related growth factors such as pleiotrophin and FGF-2[reference:25].

3. Heparinase-Containing Buffer — A Critical Innovation

Endogenous heparan sulfate binds MK and causes false lows in complex matrices — a common pitfall in other ELISAs. The kit's buffer includes heparinase to neutralize endogenous heparan sulfate, eliminating this interference[reference:26].

4. Broad Dynamic Range

The linear range of 0.1–100 pg/mL spans physiological (healthy serum: ~1–5 pg/mL) to pathological (glioma patient plasma: >20 pg/mL) concentrations[reference:27].

5. Superior Reproducibility

Intra-assay CV <5% and inter-assay CV <8% — providing reproducible, publication-quality data[reference:28].

6. Published Validation

The kit has been used in peer-reviewed research, including a study on combined antineoplastic effects in ovarian cancer cells[reference:29].

Disadvantages

1. Human-Specific

This kit is specific to human MK — not validated for mouse, rat, or other species.

2. Research Use Only

Not intended for human or clinical diagnosis.

3. Assay Duration

Standard sandwich ELISA with a working time of 3–5 hours.

Who Should Buy This Kit?

✅ Buy this kit if you:

• Study cancer biomarkers, tumor progression, or angiogenesis
• Research glioma, hepatocellular carcinoma, or gastrointestinal cancers
• Investigate neurodegeneration (Alzheimer's disease, cognitive decline)
• Work on chronic inflammation (rheumatoid arthritis, inflammatory diseases)
• Need to quantify human MK in serum, plasma, or CSF
• Require ultra-high sensitivity (0.1 pg/mL LOD) for low-abundance samples
• Value heparinase-containing buffer to eliminate false lows in complex matrices

❌ Consider alternatives if you:

• Need to detect mouse or rat MK — check Abbkine's other offerings
• Are working with clinical diagnostic samples
• Require a faster assay (<3 hours)

Quick Specs Summary

📌 Reference Link: Human Midkine (MK) ELISA Kit — KTE61678