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Related Concept Videos

Antiasthma Drugs: Methylxanthines01:24

Antiasthma Drugs: Methylxanthines

Theophylline, a member of the methylxanthine class of bronchodilators, has long been used in asthma management. While its exact mechanism of action is not fully understood, it is believed to have multiple effects on various cellular processes.
Theophylline is thought to inhibit phosphodiesterase enzymes, increasing intracellular levels of cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP). This rise in cAMP and cGMP concentrations stimulates cardiac function,...
Upper Respiratory Drugs: Antitussives, Expectorants, and Mucolytics01:23

Upper Respiratory Drugs: Antitussives, Expectorants, and Mucolytics

Respiratory symptoms, such as congestion and cough, commonly accompany respiratory tract conditions. Various medications, such as antitussives, expectorants, and mucolytics, play crucial roles in providing relief.
Antitussives include codeine, dextromethorphan (Robitussin), and benzonatate (Tessalon). Codeine and dextromethorphan exert their effects centrally by suppressing the cough reflex center in the medulla.  Benzonatate operates peripherally within the respiratory tract by anesthetizing...
Adrenergic Agonists: Mixed-Action Agents01:28

Adrenergic Agonists: Mixed-Action Agents

Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
Sedatives and Hypnotics Drugs: Miscellaneous Agents01:17

Sedatives and Hypnotics Drugs: Miscellaneous Agents

Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Cholinergic Antagonists: Pharmacokinetics01:24

Cholinergic Antagonists: Pharmacokinetics

Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and the conjunctiva.
Direct-Acting Cholinergic Agonists: Therapeutic Uses01:11

Direct-Acting Cholinergic Agonists: Therapeutic Uses

Direct-acting cholinergic agonists have many therapeutic uses in various medical fields. Choline esters, including acetylcholine, have limited clinical utility due to their non-selectivity and short duration of action. Still, acetylcholine and carbachol are applied topically during ophthalmologic surgery to induce miosis. Pilocarpine, a muscarinic and ganglionic stimulator, effectively treats open-angle glaucoma and alleviates xerostomia and dry mouth caused by radiotherapy or Sjögren syndrome.

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Toxicological Assays for Testing Effects of an Epigenetic Drug on Development, Fecundity and Survivorship of Malaria Mosquitoes
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Methylxanthines and reproduction.

Alba Minelli1, Ilaria Bellezza

  • 1Dipartimento di Medicina Sperimentale e Scienze Biochimiche, Università degli Studi di Perugia, Perugia, Italy. aminelli@unipg.it

Handbook of Experimental Pharmacology
|September 23, 2010
PubMed
Summary
This summary is machine-generated.

Caffeine consumption, even at moderate levels, does not appear to harm human fertility. However, caffeine can stimulate egg-laying in certain insects, potentially impacting agriculture.

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Area of Science:

  • Reproductive Biology
  • Toxicology
  • Entomology

Background:

  • Reproduction involves the union of male gametes (sperm) and female gametes (eggs).
  • Methylxanthines, like caffeine, are widely consumed and studied for their effects on reproduction.
  • Caffeine's impact on human fertility and its role in insect reproduction are areas of ongoing research.

Purpose of the Study:

  • To review the scientific literature on the effects of methylxanthines, particularly caffeine, on human reproduction and fertility.
  • To investigate the dose-dependent effects of caffeine on egg-laying in insects, using the coffee leaf pest as a model.

Main Methods:

  • Literature review of studies investigating methylxanthine and caffeine effects on gamete function and fertility.
  • Analysis of recent findings on caffeine's impact on insect egg-laying behavior.

Main Results:

  • Moderate daily caffeine intake (up to 400-450 mg/day) is not associated with adverse effects on general health or male fertility in humans.
  • Conflicting results exist regarding caffeine consumption and human semen quality/fertility.
  • Caffeine was shown to stimulate egg-laying in the coffee leaf pest, *Leucoptera coffeella*, in a dose-dependent manner.

Conclusions:

  • Moderate caffeine consumption appears safe for human reproduction.
  • Caffeine's stimulatory effect on insect egg-laying has implications for pest control and agricultural impacts.