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Doxycycline is a widely used antibiotic that belongs to the tetracycline class of drugs. It is a broad-spectrum antibiotic that exhibits potent antibacterial activity against a variety of microorganisms. Doxycycline is commonly prescribed for the treatment of various bacterial infections, including respiratory tract infections, urinary tract infections, and sexually transmitted infections. In addition to its antimicrobial properties, doxycycline has shown promise in the management of several non-infectious conditions.
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Figure 1. Chemical structure of doxycycline.
(Source: Way, D. V. et al., 2018)
Doxycycline is a semi-synthetic tetracycline antibiotic obtained by deoxygenating oxytetracycline at the 6α-position. Doxycycline is mostly hydrochloride, easily soluble in water or methanol, slightly soluble in ethanol or acetone, and insoluble in ether, chloroform, and benzene. Doxycycline has the common properties of tetracycline drugs and can complex metal ions such as Zn2+ and Cu2+.
Its mechanism is the same as that of tetracycline, mainly interfering with the protein synthesis of sensitive bacteria. It can specifically bind to the 30S subunit of bacterial ribosomes at the A position, thereby inhibiting the connection of aminoacyl-tRNA at this position and preventing the elongation of the peptide chain. In addition, doxycycline can change the permeability of bacterial cell membranes, causing intracellular leakage of nucleotides and other important components, thus inhibiting the replication of bacterial DNA.
Doxycycline has strong antibacterial activity against Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus pyogenes, Neisseria gonorrhoeae, Neisseria meningitidis, Escherichia coli, Enterobacter aerogenes, Shigella, Acinetobacter, Listeria monocytogenes, etc. It also has a certain effect on Rickettsia, Mycoplasma, Chlamydia, and Actinomyces. The antibacterial spectrum of doxycycline is basically the same as tetracycline and oxytetracycline, and its in vivo and in vitro antibacterial properties are stronger than tetracycline. Microorganisms have close cross-resistance to doxycycline, tetracycline, oxytetracycline, etc.
Doxycycline has a wide range of medical applications due to its effectiveness against various bacterial infections and parasitic diseases. It is commonly prescribed for the following conditions:
Beyond its primary medical uses, doxycycline has shown promise in other areas as well. It has been explored for its potential in sclerotherapy, a medical procedure used to treat blood vessels and lymphatic system malformations. By inducing controlled inflammation, doxycycline helps promote the closure of these abnormal vessels, leading to improved patient outcomes.
While doxycycline is generally well-tolerated, it may cause certain side effects in some individuals. Common adverse reactions include gastrointestinal disturbances such as nausea, vomiting, and diarrhea. These symptoms are usually mild and resolve on their own. Photosensitivity, characterized by an increased sensitivity to sunlight, is another potential side effect of doxycycline. It is advisable to use adequate sun protection measures, such as wearing protective clothing and applying sunscreen, during the course of treatment with doxycycline.
Rare but serious side effects of doxycycline include severe allergic reactions, liver toxicity, and the development of antibiotic-resistant bacterial strains. It is crucial to promptly report any unusual or severe symptoms to a healthcare professional.
Anti-inflammatory Effects
Doxycycline has been reported to be a potential drug with anti-inflammatory properties. It acts by inhibiting pro-inflammatory cytokines such as IL-1, IL-6, TNF-alpha, and matrix metalloproteinases (MMPs) while increasing the production of anti-inflammatory cytokines such as IL-10. The dual antibacterial and anti-inflammatory properties make doxycycline a potentially effective treatment option for conditions such as periodontitis, rheumatoid arthritis, and chronic obstructive pulmonary disease (COPD). However, there is still a need to provide reliable conclusions.
Anti-cancer Effects
In addition to its anti-infection effect, doxycycline can also affect tumor cell proliferation, apoptosis, invasion, metastasis, angiogenesis, and other processes through various pathways. A considerable number of in vivo and in vitro experiments have initially confirmed the anti-tumor effect of doxycycline. It has been shown to inhibit the proliferation of breast cancer cells and non-small cell lung cancer cells, induce apoptosis of cancer cells, and inhibit the invasion and metastasis of breast cancer, melanoma, and oral squamous carcinoma. However, further studies are needed to investigate its full potential and mechanism of action in cancer therapy.
Neuroprotective Effects
Doxycycline has shown promise in preclinical studies as a neuroprotective agent. It may have the ability to reduce neuronal damage and inflammation in neurodegenerative diseases like Alzheimer's disease and Parkinson's disease. These effects are thought to be related to its anti-inflammatory and antioxidant properties.
Research Reagent
Doxycycline and other tetracycline antibiotics are commonly used as research reagents in biomedical experiments. They are utilized in both in vitro and in vivo studies involving bacteria, as well as in experiments with eukaryotic cells and organisms that use tetracycline-controlled transcriptional activation systems for inducible protein expression. Doxycycline is particularly valuable in "tet-on" and "tet-off" systems, where gene expression is activated or inactivated by doxycycline, respectively. It is preferred over tetracycline due to its greater stability in these applications.
Figure 2. The Tet system.
(Source: Palais, G. et al., 2009)
In addition, doxycycline acts as an inhibitor of matrix metalloproteases at low, non-antimicrobial doses. This characteristic has made it useful in various experimental systems, including the treatment of recurrent corneal erosions that are resistant to other measures.
References
| Target | Cat. No. | Product Name | Expression System | Tag/Conjugate | Application | |
| Doxycycline | DISNJ25 | Doxycycline Standard (97%) | N/A | N/A | ELISA | Inquiry |
| DAG-L2387O | Doxycycline [OVA] | N/A | OVA | ELISA | Inquiry | |
| DAG-WT078 | Doxycycline [BSA] | N/A | BSA | N/A | Inquiry | |
| DAG243S | Doxycycline [HSA] | N/A | HSA | ELISA | Inquiry | |
| DAG435S | Doxycycline [HRP] | N/A | HRP | ELISA | Inquiry | |
| DAG524S | Doxycycline [HSA-Biotin] | N/A | HSA-Biotin | ELISA | Inquiry | |
| Tetracycline | DISNJ06 | Tetracycline Standard (98%) | N/A | N/A | ELISA | Inquiry |
| DAGA-054B | Tetracycline [BSA] | N/A | BSA | LFIA | Inquiry | |
| DAGA-059K | Tetracycline [KLH] | N/A | KLH | Immunogen | Inquiry | |
| DAG4474O | Tetracycline [OVA] | N/A | OVA | N/A | Inquiry | |
| DAG161S | Tetracycline [HSA] | N/A | HSA | ELISA | Inquiry | |
| DAG472S | Tetracycline [HSA-Biotin] | N/A | HSA-Biotin | ELISA | Inquiry | |
| DAG1310 | Tetracycline(4) [HRP] | N/A | HRP | N/A | Inquiry | |
| DAG4474 | Tetracycline [BSA] | N/A | BSA | N/A | Inquiry | |
| Oxytetracycline | DISNJ07 | Terramycin Standard | N/A | N/A | ELISA | Inquiry |
| DAGS039 | 4-epi-Oxytetracycline standard | N/A | N/A | ELISA | Inquiry |
| Target | Cat. No. | Product Name | Size | Species Reactivity | Application | Detection Sample | |
| Doxycycline | DEIARN99048 | Doxycycline ELISA Test Kit | 96T | quantitative | feed, tissue(meat,liver and kidney), milk, serum,plasma and urine | Inquiry | |
| DEIA-XYZ31 | Doxycycline ELISA Kit | 96T | quantitative | Honey, Milk, Urine, Meat | Inquiry | ||
| Tetracycline | DEIA046 | Tetracyclines ELISA Kit | 96T | N/A | Quantitative | Inquiry | |
| DEIA1040 | Tetracycline ELISA Kit | 96T | Chicken | Quantitative | chicken | Inquiry | |
| Oxytetracycline | DEIA-XYZ35 | Oxytetracycline ELISA Kit | 96T | N/A | Quantitative | Honey, butter, fermented milk, feed, egg, cheese, milk, meat, meat products (sausage), fish and shrim | Inquiry |
| IL-6 | DEIABL-G5 | Goat IL-6(Interleukin 6) ELISA Kit | 96T | Goat | Quantitative | Serum, plasma, tissue homogenates and other biological fluids. | Inquiry |
| DEIABL87 | Monkey IL-6(Interleukin 6) ELISA Kit | 5 Plates | Monkey | Quantitative | Serum, plasma, tissue homogenates and other biological fluids. | Inquiry | |
| TNF-alpha | ABPR-ZB157 | Human TNF-alpha Antibody Pair Set | 5 Plates, 15 Plates | Human | sELISA | Inquiry | |
| ABPR-ZB242 | Mouse TNF-alpha Antibody Pair Set | 5 Plates, 15 Plates | Mouse | sELISA | Inquiry | ||
| ABPR-ZB305 | Ferret TNF-alpha Antibody Pair Set | 5 Plates, 15 Plates | Ferret | sELISA | Inquiry |
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