Saliva Test Could Aid Early Detection of Ectopic Pregnancy

By LabMedica International staff writers
Posted on 12 Oct 2023

Image: Ectopic pregnancy primarily occurs in the fallopian tubes but may arise in other sites (Photo courtesy of 123RF)

Ectopic pregnancy, also known as extrauterine pregnancy (EP), happens when a fertilized egg attaches and grows outside the uterus. This condition poses significant risks to the mother's health and life. Currently, ultrasonography is the primary way to diagnose an EP, but it's not an early detection method. Due to the lack of timely diagnosis, women face elevated health risks. Researchers have been exploring the possibility of using pathological or molecular markers for early detection, which could be a game-changer in clinical diagnosis and treatment. In the latest effort, a study investigated whether salivary proteins could serve as potential biomarkers for identifying EP, using gel-based protein mass spectrometry.

Researchers at RNT Medical College (Rajasthan, India) focused on proteins in saliva that could become selectively elevated in EP. For the analysis, they used gel-based protein separation followed by liquid chromatography-tandem mass spectrometry (LC-MS/MS) to identify the proteins. The researchers found 326 different proteins in the saliva samples they examined. Interestingly, 101 of these proteins were exclusively present in the saliva of patients with ruptured EP. Many of these proteins are associated with defense mechanisms, such as the innate immune system, neutrophil degranulation, interactions with the blood vessel wall, and activation of the nuclear factor kB (NF-kB) pathway.

These initial findings indicate that certain salivary proteins, like Complement C4-B, Plasminogen Activator Inhibitor 2 and 1, and Glutathione S-transferase omega-1, could serve as promising biomarkers for EP. These proteins have also been found to play a role in other reproductive issues and may be relevant to EP as well. Further research is currently underway to better understand the diagnostic potential and specificity of these salivary proteins in relation to EP.

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RNT Medical College