Stress Triggers for Herpes reactivation
Human herpes viruses (HSV-1, HSV-2, HHV-3) infect and are stored in cells (neurons and glia) of the nervous system, while CMV/HHV-5 and HHV-6 are latent in endothelial, smooth muscle, and macrophage cells.
Latent herpes infections chronically elevate COX-2 expression in the infected cells through NF-kB and
control host-cell metabolism by modifying gene transcription. Arousal/stimulation/intercourse causes the release of neurotransmitters glutamate and norepinephrine which stimulate the release of arachidonic acid and trigger the stress response gene
JNK through increase PGE
2 production. According to this
paper (and
press release),
the herpes viruses are kept latent by methyl groups attached to the virus DNA. Methyl groups act as the off-switch for the virus. When
JNK is activated, methyl groups attached to the herpes DNA are removed. This DNA demethylation results in the virus replicating and spreading. Once herpes is reactivated, it starts to replicate and migrate to other parts of the nervous system through the dendrites (connections). The recurrent reactivation of the herpes virus triggers an immune response which stops the spread of the virus while causing POIS symptoms.
This model incorporates the immune response mechanism described
here. In this case,
chemotaxis means
T cell movement to the site of infection, and
chemokines (i.e. IL-8) are types of cytokines that tell the T cells where to go.
In this herpes model of POIS, as the virus spreads, the immune system attacks the herpes virus and herpes infected cells. The attack by the immune system on the virus causes inflammation and allergy, and you become sick. Therefore, in this virus model, POIS is an attack by an immune system on a spreading pathogen (virus).
The immune system is trying to stop the spread of the virus (
Ref). An HHV-3 infected person with a weak immune system would not get POIS. They would get shingles. Shingles occur when the immune system is weak and cannot fight the virus. And shingles can be triggered by stress.
The virus itself is not the main thing that makes you feel sick, even though it is doing some damage to your body. What makes you feel sick (POIS) is the immune system releasing different molecules (histamine, cytokines, reactive oxygen species, antigens, etc...) to kill or contain the virus. For POIS, it is important to remember that even though the immune system is making you feel sick, if the immune system fails to contain the virus, HHV could spread and cause permanent damage to the body and nervous system.
HSV reactivation requires both
JNK up-regulation and de-methylation of the herpes DNA [J2,J3]. The authors of this paper were able to stop herpes outbreaks by inhibiting the JNK gene alone [J1,J3]. The following article positively identifies prostaglandin E2 (PGE
2) as the required molecule for herpes reactivation (
article). Previous papers had only showed that COX-2 inhibition could block herpes reactivation. But this paper shows that adding PGE
2 to neurons after inhibiting COX-2 can still cause the virus to replicate. So the arachidonic acid (AA) cascade (AA/COX-2/PGE
2) is the stress-sensing trigger for JNK and herpes virus replication.
Norepinephrine: In scientific studies, epinephrine is the most commonly used inducer of herpes simplex reactivation due to its high potency and long-lasting effects (
Ref). Epinephrine is the technical name for adrenaline and norepinephrine is the technical name for noradrenaline. One of the most important roles of epinephrine and norepinephrine the regulation of muscle contractions in the body: heart muscle (heart rate), blood vessels (blood flow), muscles of the reproductive organs (orgasmic contraction, ejaculation). Epinephrine and norepinephrine blood levels rise sharply at the point of orgasm (
Ref).
Glutamate:"Glutamate treatment leads to a robust, progressive activation of the ERK and JNK/SAPK MAPK cascades." -Glutamate Induces Phosphorylation of.... Glutamate is a potent endogenous JNK activator (
Ref1,
Ref2,
Ref3). Activation of the NMDA receptor increases the replication of CMV (HHV-5) (
Ref).
Beta herpesvirus dependent POIS"Furthermore, angioplasty-induced injury to the vessel wall and reperfusion after balloon angioplasty produce ROS8 and cytokines. The resulting activation of NF-kB can in turn stimulate the MIEP present in latently infected cells and thereby contribute to reactivation of latent CMV...Recent studies have shown that CMV infection of human cells leads to stimulation of arachidonic acid (AA) release." -Aspirin Attenuates Cytomegalovirus Infectivity and Gene Expression Mediated by Cyclooxygenase-2 in Coronary Artery Smooth Muscle Cells (1998)
Cytomegalovirus (CMV, HHV-5) and HHV-6 are
Betaherpesvirinae that primarily latently infect endothelial cells such as blood vessels and epithelial mucosa such as intestinal epithelia (
Ref). This is unlike alpha-herpes viruses (HSV-1, HSV-2, VZV) which primarily latently infect neurons. Within minutes of infecting endothelial cells CMV upregulates reactive oxygen species (H
2O
2), NF-kB, COX-2 and cytokines (
RefSE). These
Betaherpesvirinae maintain this inflammatory environment while latent.
"These results suggest that infection by CMV or HHV-6 causes vascular endothelial injury, with HHV-6 having a stronger effect than CMV, and combined infection having a stronger effect than either virus alone."
-Endothelial damage caused by cytomegalovirus and human herpesvirus-6 (2003)
CMV (and HHV-6) latency within endothelial cells leads to injury of vascular and smooth muscle tissue (
Ref,
Ref). Stretching this injured tissue causes a stress response of free radical production (
RefGR) leading to reactivation and replication of the virus (
RefSE).
The reponse of the immune system to this virus replication is POIS."Enhancement of promoter activity by endogenous catecholamines is essential for high-level transgene expression from MIECMV within the vasculature." -Beta-Adrenoceptor Blockade Markedly Attenuates Transgene Expression From Cytomegalovirus Promoters Within the Cardiovascular System
During orgasm there is a sudden rise in norepinephrine (noradrenaline) and epinephrine (adrenaline). This norepinephrine (and epinephrine) can cause vasodilation via the beta2-adrenergic receptor of the arteries in the brain and through out the body. Vasodilation creates a ballooning stress on the arteries that is normal under certain temporary conditions such as orgasm or exercise where increased blood flow is needed in certain areas of the body. However, any arteries that have been injured by latent infection of CMV (or HHV-6) will be triggered by this stretching stress to reactivate the virus (
Ref) causing an immune response. Norepinephrine levels may fall shortly after orgasm. However, because of the immune response to reactivated CMV, histamine and nitric oxide levels rise causing a secondary vasodilation (stretching) of the arteries.
Eating induced POIS-related/POIS-like symptoms: This is of course just a hypothesis. Betaherpesvirae like CMV can infect and establish latency in intestinal epithelia (
Ref). If the intestinal epithelia are infected by CMV (and/or HHV-6) at a certain location, food passing through the stomach can stretch the intestines at the location of the infection and causing stress-reactivation of the virus. This passing food would, by stretching that part of the intestine induce an immune response leading to either local irritable bowel syndrome (IBS) or systemic inflammation. This effect may lead people to think that specific foods are causing their IBS when it is just over eating. If there is a food that you really like or has MSG in it, you may be more inclined to over-eat. The MSG has nothing to do with the IBS. It is the inability to know when to stop eating that is causing the IBS/inflammation.
To avoid IBS, eat smaller portions of food and drink water with your food to reduce friction and pressure in the area of the intestine that is infected with the virus.
Gamma herpesviruses Reactivation and replication of gamma herpesviruses like Epstein-Barr virus (EBV, HHV-4) and Kaposi's Sarcoma Associated Herpesvirus (KSHV, HHV-8) are uniquely inhibited by agonist of the cannabinoid receptors (
Ref). Cannabinoid agonist such as THC inhibit HHV-4 reactivation but do not inhibit HSV-1, HSV-2 or CMV.
Other stress-triggers: