Anti-MMP-24 Rabbit Polyclonal Antibody

Frequently Asked Questions

What molecular weight should I expect for MMP-24 on a Western blot?

MMP-24 is a 645-residue transmembrane protein with a predicted molecular weight of approximately 72 kDa for the full-length form. On Western blots, you may observe the proenzyme at this size or slightly higher due to glycosylation, which is common among membrane-type MMPs. Depending on your sample preparation and cellular context, you may also detect processed forms lacking the prodomain or C-terminal fragments if proteolytic activation has occurred. Neural tissues and stem cell lysates typically show the full-length membrane-anchored species. Always include a positive control lysate from cells known to express MMP-24.

Does MMP-24 cleave type I collagen like other MMPs?

No. MMP-24 exhibits an atypical substrate profile for a matrix metalloproteinase and shows no detectable activity against type I collagen or laminin, distinguishing it from most classical and membrane-type MMPs. Validated substrates include N-cadherin, dermatan sulfate proteoglycans, chondroitin sulfate proteoglycans, and fibronectin, though fibronectin cleavage is partial. This narrow specificity reflects MMP-24's specialized role in neural stem cell niche remodeling rather than broad extracellular matrix degradation. If your experimental readout relies on collagen turnover, MMP-24 is unlikely to be a relevant target.

What is the recommended starting dilution for Western blot with this antibody?

We recommend starting at 1:1000 dilution for Western blot, which has been validated in our hands with human lysates. Because MMP-24 is not ubiquitously expressed and localizes predominantly to specialized tissues such as neural stem cell niches, expression levels vary widely across sample types. If signal is weak, titrate up to 1:500. For immunohistochemistry and immunofluorescence, begin around 1:200 to 1:500 and optimize based on background staining. Always include a no-primary control to assess nonspecific binding, particularly in membrane-enriched fractions where polyclonal antibodies can occasionally show off-target reactivity.

Is this antibody validated for mouse and rat samples?

This antibody is validated for human samples. Cross-reactivity with mouse and rat MMP-24 is predicted based on sequence homology in the immunogen region but has not been experimentally confirmed in our laboratory. If you are working with rodent tissues, we recommend running a pilot blot with positive control lysates from brain or neurogenic regions where MMP-24 expression is expected. Monkey and dog cross-reactivity are also predicted but unvalidated. Researchers have reported variable success with polyclonal MMP antibodies across species, so empirical testing with your specific sample type is essential before committing to a full experimental series.

What sample preparation works best for detecting membrane-bound MMP-24?

MMP-24 is a transmembrane protein, so enrichment strategies improve detection sensitivity. Standard RIPA buffer works for whole-cell lysates, but membrane fractionation or detergent extraction with 1 percent Triton X-100 or NP-40 enhances yield from plasma membrane pools. Avoid excessively harsh conditions that strip the transmembrane domain, as you may lose the full-length species. For neural tissues, mechanical homogenization followed by differential centrifugation to pellet membranes is effective. Include protease inhibitors to prevent autocatalytic processing. If you observe multiple bands, consider that MMP-24 undergoes zymogen activation and extracellular domain shedding in some cellular contexts.

Which tissues or cell lines are good positive controls for MMP-24 expression?

MMP-24 is expressed at highest levels in brain, particularly in the subependymal zone where neural stem cells reside, and in glioblastoma cell lines. Human fetal brain lysates are reliable positive controls. Among established cell lines, certain glioma or medulloblastoma lines show endogenous MMP-24 expression, though levels vary. Primary neural progenitor cultures also express MMP-24. Expression is generally low or absent in non-neural tissues and most epithelial or fibroblast lines. If you lack a known positive control, verify MMP-24 transcript presence by RT-PCR before committing to Western blot optimization.

How should I store this antibody and what is the expected shelf life?

Store the antibody at minus 20 degrees Celsius in single-use aliquots to avoid repeated freeze-thaw cycles, which can reduce titer and increase aggregation, particularly for polyclonal preparations. The 100 microgram pack size is sufficient for approximately 100 Western blots at the recommended 1:1000 dilution. Aliquot upon receipt into 10 to 20 microliter volumes in low-bind tubes. Stored properly, rabbit polyclonal antibodies remain stable for at least two years. If you observe increased background or loss of signal over time, this typically indicates degradation from temperature cycling rather than inherent instability of the antibody.

Can I use this antibody to detect active versus pro-form MMP-24?

This polyclonal antibody recognizes an epitope spanning a broad region of MMP-24 and will detect both the proenzyme and activated forms, provided the epitope remains intact after proteolytic processing. It does not selectively distinguish zymogen from active enzyme. Activation of MMP-24 involves removal of the N-terminal prodomain by furin-like convertases, and the enzyme may also undergo ectodomain shedding. If you need to distinguish activation states, consider using the antibody in combination with a functional assay or an activation-state-specific antibody if available. Most researchers detect total MMP-24 protein and infer activity from substrate cleavage readouts.